Toyota Prius: Sfi System

Toyota Prius (XW60) 2023-2025 Service Manual / Engine/Hybrid System / 2zr-fxe (engine Control) / Sfi System

Precaution
Definition Of Terms
Parts Location
System Diagram
How To Proceed With Troubleshooting
Check For Intermittent Problems
Basic Inspection
Registration
Initialization
Terminals Of Ecm
Diagnosis System
Dtc Check / Clear
Freeze Frame Data
Check Mode Procedure
Fail-safe Chart
Data List / Active Test
Vehicle Control History
A Camshaft Position Actuator Bank 1 Circuit Open (P001013)
Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1 (P001100,P001200)
Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A (P001600)
HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P101A9E)
HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery (P003612,P003614,P102A9E)
Manifold Absolute Pressure - Barometric Pressure Correlation (P006900)
Mass or Volume Air Flow Sensor "A" Circuit Short to Battery (P010012,P010014)
Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Ground (P010511)
Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Battery or Open (P010515)
Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground (P011011)
Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open (P011015)
Engine Coolant Temperature Sensor 1 Circuit Short to Ground (P011511)
Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open (P011515)
Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)
Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground (P012011)
Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open (P012015)
Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range (P01201C)
O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open (P013613,P013617,P01361C)
System Too Lean Bank 1 (P017100,P017200)
Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground (P022011)
Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open (P022015)
Random/Multiple Cylinder Misfire Detected (P030000,P030027,P030085-P030400)
Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511)
Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Battery or Open (P032515)
Crankshaft Position Sensor "A" Circuit Short to Ground (P033511)
Crankshaft Position Sensor "A" Circuit Short to Battery or Open (P033515)
Crankshaft Position Sensor "A" Signal Stuck in Range (P03352A)
Crankshaft Position Sensor "A" No Signal (P033531)
Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground (P034011)
Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Battery or Open (P034015)
Camshaft Position Sensor "A" Bank 1 or Single Sensor Signal Stuck in Range (P03402A)
Camshaft Position Sensor "A" Bank 1 or Single Sensor No Signal (P034031)
Exhaust Gas Recirculation "A" Low / Insufficient Flow (P04019C)
Exhaust Gas Recirculation "A" Control Circuit 1 Open (P040314,P140000,P140596,P141004)
Catalyst System Efficiency Below Threshold Bank 1 (P042000)
Evaporative Emission System Purge Control Valve "A" Circuit Open (P044313)
System Voltage Circuit Short to Ground or Open (P056014)
Internal Control Module Random Access Memory (RAM) Error Data Memory Failure (P060444)
Control Module Processor Watchdog/Safety MCU Failure (P060647)
Control Module Performance Bank 1 Watchdog/Safety MCU Failure (P060747,P060787)
Internal Control Module Throttle Position Performance Internal Electronic Failure (P060E49)
VIN Not Programmed (P063051)
Actuator Supply Voltage "A" Circuit Short to Ground or Open (P065714)
Throttle Actuator "A" Control Motor Circuit Current Below Threshold (P210018,P210019)
Throttle/Pedal Position Sensor "A" Minimum Stop Performance (P210900)
Throttle Actuator "A" Control System Actuator Stuck Open (P211172,P211173)
Throttle Actuator "A" Control Throttle Body Range/Performance (P211900,P211904,P211977,P21199B)
Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)
A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Circuit Current Above Threshold (P219519,P219524,P219618,P219623)
Barometric Pressure Sensor "A" Circuit Short to Ground (P222611,P222615)
Barometric Pressure Sensor "A" Missing Message (P222687,P222696)
A/F (O2) Sensor Positive Current Control Circuit / Open Bank 1 Sensor 1 (P223700,P223711,P223712,P223713,P22371B,P225111,P225112)
Ignition Switch On/Start Position Circuit Low Circuit Short to Ground or Open (P253314)
ECM/PCM Engine Off Timer Performance Signal Invalid (P261029)
Engine Coolant Pump Circuit Short to Battery (P26CA12)
Engine Coolant Pump No Signal (P26CA31)
Engine Coolant Pump Actuator Stuck (P26CB71)
Engine Coolant Pump Overspeed (P26CE37)
O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold (P2A0026)
Poor Engine Power (P319000,P319100)
Fuel Run Out (P319300)
Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)
Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message (U011187)
Lost Communication With Hybrid Powertrain Control Module Missing Message (U029387)
Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message (U115087)
ECM Power Source Circuit
VC Output Circuit
Fuel Pump Control Circuit
Fuel Injector Circuit
MIL Circuit
Ignition Circuit
Rough Idling

Precaution

PRECAUTION

WHEN USING GTS

CAUTION:

Observe the following items for safety reasons:

Before using the GTS, read the instruction manual.
Prevent the GTS cable from being caught on the pedals, shift lever or steering wheel when driving with the GTS connected to the Toyota Prius vehicle.
When driving the vehicle for testing purposes using the GTS, 2 persons are required. One to drive the vehicle, and another to operate the GTS.

INITIALIZATION

NOTICE:

Perform Registration (VIN registration or frame number registration) when replacing the ECM.
Click here
When the ECM is replaced, update the ECU security key.
Click here
Perform Learning Value Reset and Idle Learning after replacing or servicing parts related to engine operation.
Click here

PRECAUTIONS FOR DISCONNECTING CABLE FROM NEGATIVE (-) AUXILIARY BATTERY TERMINAL

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PRECAUTIONS FOR INSPECTING HYBRID CONTROL SYSTEM

(a) Refer to Hybrid Control System.

Click here

NOTICE FOR HYBRID CONTROL SYSTEM ACTIVATION

(a) Refer to Hybrid Control System.

Click here

Definition Of Terms

DEFINITION OF TERMS

Term	Definition
Monitor Description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details).
Typical Enabling Conditions	Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM stores a DTC when the monitored value(s) exceeds the malfunction threshold(s).
Required Sensors/Components	The sensors and components that are used by the ECM to detect malfunctions.
Frequency of Operation	The number of times that the ECM checks for malfunctions per driving cycle. "Once per driving cycle" means that the ECM detects a malfunction only once during a single driving cycle. "Continuous" means that the ECM detects a malfunction every time the enabling conditions are met.
Duration	The minimum time for which the ECM must detect a continuous deviation in the monitored value(s) in order to store a DTC. Timing begins after the "typical enabling conditions" are met.
Typical Malfunction Thresholds	Value beyond which the ECM will determine that there is a malfunction and stores a DTC.

Parts Location

PARTS LOCATION

ILLUSTRATION

*1	AIR FUEL RATIO SENSOR	*2	FUEL PUMP
*3	HEATED OXYGEN SENSOR	*4	MASS AIR FLOW METER SUB-ASSEMBLY
*5	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY	*6	ECM

ILLUSTRATION

*1	CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY	*2	CRANKSHAFT POSITION SENSOR
*3	EGR VALVE ASSEMBLY	*4	ENGINE COOLANT TEMPERATURE SENSOR
*5	FUEL INJECTOR ASSEMBLY	*6	KNOCK CONTROL SENSOR
*7	PURGE VSV	*8	THROTTLE BODY ASSEMBLY
*9	ENGINE WATER PUMP ASSEMBLY	*10	MANIFOLD ABSOLUTE PRESSURE SENSOR
*11	IGNITION COIL ASSEMBLY	*12	CAMSHAFT POSITION SENSOR

ILLUSTRATION

*1	COMBINATION METER ASSEMBLY	*2	HYBRID Toyota Prius Vehicle CONTROL ECU
*3	DLC3	-	-

System Diagram

SYSTEM DIAGRAM

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

*: Use the GTS.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

3.	CONNECT GTS TO DLC3*

HINT:

If the display indicates a communication malfunction, inspect the DLC3.

When any CAN communication system DTCs are output, perform troubleshooting for the CAN communication system first.

4.	CHECK DTC AND FREEZE FRAME DATA*

(a) Check for DTCs.

Powertrain > Engine > Trouble Codes

(b) Check for freeze frame data.

Click here

HINT:

Record or print DTCs and freeze frame data if necessary.

5.	CLEAR DTC AND FREEZE FRAME DATA*

(a) Clear the DTCs and freeze frame data.

Powertrain > Engine > Clear DTCs

6.	CONDUCT VISUAL INSPECTION

7.	SELECT CHECK MODE DIAGNOSIS*

(a) Change the ECM from normal mode to check mode.

Click here

Powertrain > Engine > Utility

Tester Display
Check Mode

8.	CONFIRM PROBLEM SYMPTOMS

(a) Confirm the problem symptoms.

HINT:

If the engine does not start, first perform the "Check DTC" procedure and "Conduct Basic Inspection" procedure below.

Result	Proceed to
Malfunction does not occur	A
Malfunction occurs	B

GO TO STEP 10

9.	SIMULATE SYMPTOMS

HINT:

Refer to Symptom Simulation.

Click here

10.	CHECK DTC*

(a) Check for DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

GO TO STEP 12

11.	REFER TO DTC CHART

HINT:

Refer to Diagnostic Trouble Code Chart.

Click here

12.	CONDUCT BASIC INSPECTION

(a) Conduct basic inspection.

Click here

Result	Proceed to
Malfunctioning parts not confirmed	A
Malfunctioning parts confirmed	B

GO TO STEP 17

13.	REFER TO PROBLEM SYMPTOMS TABLE

HINT:

Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Malfunctioning circuit confirmed	A
Malfunctioning parts confirmed	B

GO TO STEP 17

14.	CHECK ECM POWER SOURCE CIRCUIT

(a) Check the ECM power source circuit.

Click here

15.	CONDUCT CIRCUIT INSPECTION

Result	Proceed to
Malfunction not confirmed	A
Malfunction confirmed	B

GO TO STEP 18

16.	CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems.

Click here

17.	CONDUCT PARTS INSPECTION

18.	IDENTIFY PROBLEM

19.	ADJUST AND/OR REPAIR

20.	CONDUCT CONFIRMATION TEST

END

Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

HINT:

Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the GTS when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.

Clear the DTCs.
Click here
Change the ECM from normal mode to check mode using the GTS.
Click here
Perform a simulation test.
Click here
Check and wiggle the harness(es), connector(s) and terminal(s).
Click here

Basic Inspection

CAUTION / NOTICE / HINT

When a malfunction is not confirmed by the DTC check, troubleshooting should be carried out for all circuits considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown in the following procedure, the location of the problem can be found quickly and efficiently. Therefore, using this check is essential when troubleshooting the engine.

PROCEDURE

1.	CHECK AUXILIARY BATTERY VOLTAGE

NOTICE:

Carry out this check with the engine stopped and the ignition switch off.

Result	Proceed to
11 V or higher	OK
Below 11 V	NG

CHARGE OR REPLACE AUXILIARY BATTERY

2.	CHECK WHETHER ENGINE CRANKS

PROCEED TO PROBLEM SYMPTOMS TABLE

3.	CHECK WHETHER ENGINE STARTS

GO TO STEP 6

4.	CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

(a) Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

5.	CHECK IDLE SPEED

(a) Check the engine idle speed.

Click here

PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT

6.	CHECK FUEL PRESSURE

(a) Check the fuel pressure.

Click here

PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT

7.	CHECK FOR SPARK

(a) Perform a spark test.

Click here

PROCEED TO PROBLEM SYMPTOMS TABLE

PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT

Registration

REGISTRATION

CAUTION / NOTICE / HINT

PROCEDURE

1. VIN or FRAME NUMBER

NOTICE:

The Vehicle Identification Number (VIN) or frame number must be written to a replacement ECM.

(a) DESCRIPTION

HINT:

This registration section consists of 2 parts: Read VIN or Frame Number and Write VIN or Frame Number.

(1) Read VIN or Frame Number: This procedure allows the VIN or frame number stored in the ECM to be read in order to confirm that the VINs or frame numbers, provided on the Toyota Prius vehicle body and stored in the vehicle ECM, are the same.

(2) Write VIN or Frame Number: This procedure allows the VIN or frame number to be written to the ECM. If the ECM is replaced, or the ECM VIN or frame number and vehicle VIN or frame number do not match, the VIN or frame number can be registered, or overwritten in the ECM by following this procedure.

(b) READ VIN OR FRAME NUMBER

(1) Confirm the Toyota Prius vehicle VIN or frame number.

(2) Enter the following menus: Powertrain / Engine / Utility / VIN / VIN Read.

Powertrain > Engine > Utility

Tester Display
VIN

(3) According to the display on the GTS, read the frame number or VIN stored in the ECM.

(1) Confirm the Toyota Prius vehicle VIN or frame number.

(2) Enter the following menus: Powertrain / Engine / Utility / VIN / VIN Write.

Powertrain > Engine > Utility

Tester Display
VIN

(3) According to the display on the GTS, write the Toyota Prius vehicle frame number or VIN to the ECM.

Initialization

INITIALIZATION

Inspection After Repair

Perform Learning Value Reset and Idle Learning after replacing or servicing parts related to engine operation. Details on procedures required are indicated by an asterisk and a number, and are explained in detail following the table.

Part Replaced	Engine Operation	Learning Value Reset*1	Idle Learning*2
Throttle body assembly3 Cleaning the deposits from the throttle body assembly3	-	○	○
Engine assembly	-	○	○
Cylinder head sub-assembly Camshaft (for intake or exhaust camshaft) Camshaft timing gear assembly Piston or piston ring Mass air flow meter sub-assembly Fuel injector assembly Fuel pump Air fuel ratio sensor Engine coolant temperature sensor Spark plug Ignition coil assembly EGR valve assembly Air leaks from intake system Gas leaks from exhaust system	Confirm the following and perform Learning Value Reset and Idle Learning when one or more of the following conditions is met: A DTC was output before component replacement. An air fuel ratio learned value (A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1 or A/F Learn Value High Bank 1) displayed in the Data List was higher than /- 20% before component replacement. Starting failure or rough idle occurs, or the engine stalls after component replacement.	○	○
	None of the conditions in the list above are met.	-	-
Knock control sensor*4	-	-	-

○: Necessary.
-: Unnecessary.

NOTICE:

Engine learned values cannot be reset by disconnecting the cable from the negative (-) auxiliary battery terminal or removing the EFI-MAIN and ETCS fuses.

*1: Learning Value Reset
1. Enter the following menus: Powertrain / Engine / Utility / Learning Value Reset.
2. Confirm the following conditions as instructed on the screen.
  - - Ignition switch ON
  - - Engine stopped
  - - Auxiliary battery voltage is higher than 9 V
3. Select "Next" and initialize the learned value.
  HINT:
  
  If a message indicating learned value initialization failure is displayed on the screen, confirm the execution conditions, and perform Learning Value Reset again.
4. After the completion of learned value initialization, confirm the air fuel ratio learned values (A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1, and A/F Learn Value High Bank 1) in the Data List.
  If 0 is displayed for all of the air fuel ratio learned values, initialization has completed correctly.
  
  If a value other than 0 is displayed for one of the air fuel ratio learned values, perform initialization again. After initialization, confirm the air fuel ratio learned values. If a value other than 0 is displayed, replace the ECM.
*2: Idle Learning
1. Turn the ignition switch off and wait for at least 30 seconds.
2. Turn the ignition switch ON.
3. Put the engine in Inspection Mode (Maintenance Mode).
  Click here
4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
5. Start the engine and warm it up until the engine coolant temperature is 70°C (158°F) or higher.
6. Turn the ignition switch off, and then ON (READY).
7. With park (P) selected, lightly depress the accelerator pedal to start the engine.
8. Wait until the engine stops.
  HINT:
  
  The engine normally stops within 1 minute. However, when the HV battery SOC is low, the engine may remain running for approximately 3 minutes.
9. Enter the following menus: Powertrain / Engine / Data List / ISC Learning.
10. Confirm that "Compl" is displayed on the GTS screen.
11. Put the engine in Inspection Mode (Maintenance Mode).
  Click here
12. Start the engine.
13. Enter the following menus: Powertrain / Engine / Data List / Engine Speed and Engine Independent.
14. Check the Engine Speed when the value of Data List item Engine Independent is "Operate".
  Standard:
  
  Engine Idle Speed
  
  950 to 1050 rpm
  HINT:
  - Be sure to perform this step with the A/C switch and all accessories off.
  - Make sure that park (P) is selected.
  - If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Check the Engine Speed after charge control is complete ("Operate" is displayed).
*3: Perform Learning Value Reset and Idle Learning after replacing the throttle body assembly or cleaning deposits from the throttle body assembly.
After that, check the idle speed. If the idle speed is out of the specified range, perform the following procedure.

CAUTION:

When performing a driving test, obey all speed limits and traffic laws.

HINT:

History information for driving and stopping is necessary to update Idle Learning.
1. Put the engine in Inspection Mode (Maintenance Mode).
  Click here
2. Warm up the engine (engine coolant temperature of 80°C (176°F) or higher) with the A/C switch and all accessories off [A].
3. While the engine running, drive the Toyota Prius vehicle at a speed of 10 km/h (6 mph) or more [B].
  HINT:
  
  If the engine stops, further depress the accelerator pedal to restart the engine.
4. Idle the engine for 20 seconds or more [C].
5. Repeat procedure [B] and [C].
6. Enter the following menus: Powertrain / Engine / Data List / Engine Speed and Engine Independent.
7. Check the Engine Speed when the value of Data List item Engine Independent is "Operate" [D].
  Standard:
  
  Engine Idle Speed
  
  950 to 1050 rpm
  HINT:
  - Be sure to perform this step with the A/C switch and all accessories off.
  - Make sure that park (P) is selected.
  - If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Check the Engine Speed after charge control is complete ("Operate" is displayed).
  - If the idle speed is still out of the specified range, repeat procedure [B] and [C] until the idle speed is within the specified range [E].
*4: Drive the Toyota Prius vehicle for a short while after replacing the knock control sensor and check if knocking occurs. If knocking occurs, drive the vehicle until knocking stops.

Terminals Of Ecm

TERMINALS OF ECM

HINT:

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A91-1 (BATT) - A91-17 (E1)	Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory)	Ignition switch off	11 to 16 V
A91-2 ( B) - A91-17 (E1)	Power source of ECM	Engine stopped, ignition switch ON	11 to 14 V
A91-3 ( B2) - A91-17 (E1)	Power source of ECM	Engine stopped, ignition switch ON	11 to 14 V
A91-9 (CFDH) - A91-17 (E1)	CAN communication line	Engine stopped, ignition switch ON	Pulse generation (See waveform 1)
A91-10 (CFDL) - A91-17 (E1)	CAN communication line	Engine stopped, ignition switch ON	Pulse generation (See waveform 2)
A91-11 (CFDT) - A91-17 (E1)	CAN communication line	Engine stopped, ignition switch ON	Pulse generation (See waveform 1)
A91-12 (CFDB) - A91-17 (E1)	CAN communication line	Engine stopped, ignition switch ON	Pulse generation (See waveform 2)
A91-15 (E01) - Body ground	Ground	Always	Below 1 Ω
A91-17 (E1) - Body ground	Ground	Always	Below 1 Ω
A91-22 (NEO) - A91-17 (E1)	Crankshaft revolution signal	Idling with warm engine	Pulse generation (See waveform 3)
A91-23 (G2O) - A91-17 (E1)	Camshaft revolution signal	Idling with warm engine	Pulse generation (See waveform 4)
A91-27 (MREL) - A91-17 (E1)	EFI-MAIN relay operation signal	Engine stopped, ignition switch ON	Below 1.5 V
A91-28 (FREL) - A91-17 (E1)	Fuel lid lock with motor assembly operation signal	Fuel lid lock with motor assembly operating	Below 1.0 V
A91-28 (FREL) - A91-17 (E1)	Fuel lid lock with motor assembly operation signal	Fuel lid lock with motor assembly not operating	11 to 14 V
A91-29 (FC) - A91-17 (E1)	Fuel pump control	Engine stopped, ignition switch ON	11 to 14 V
A91-29 (FC) - A91-17 (E1)	Fuel pump control	Idling	Below 1.5 V
A91-32 (EC) - Body ground	Ground	Always	Below 1 Ω
A91-39 (IGR) - A91-17 (E1)	Ignition signal	Ignitionr switch ON	11 to 14 V
A91-41 (IGP) - A91-17 (E1)	Ignition switch signal	Ignition switch ON	11 to 14 V
A91-42 (FANL) - A91-17 (E1)	Cooling fan motor operation signal (low)	Ignition switch ON	11 to 14 V
A91-42 (FANL) - A91-17 (E1)	Cooling fan motor operation signal (low)	Idling, high engine coolant temperature	Below 1.5 V
A91-43 (FANH) - A91-17 (E1)	Cooling fan motor operation signal (high)	Ignition switch ON	11 to 14 V
A91-43 (FANH) - A91-17 (E1)	Cooling fan motor operation signal (high)	Idling, high engine coolant temperature	Below 1.5 V
A91-60 (FUEL) - A91-17 (E1)	Fuel lid opener switch signal	Fuel lid opener switch pressed	Below 1.0 V
A91-60 (FUEL) - A91-17 (E1)	Fuel lid opener switch signal	Fuel lid opener switch not pressed	4.5 to 5.5 V
C53-28 (HA1A) - A91-17 (E1)	Air fuel ratio sensor heater operation signal	Engine stopped, ignition switch ON	11 to 14 V
C53-28 (HA1A) - A91-17 (E1)	Air fuel ratio sensor heater operation signal	Idling with cold engine	Pulse generation (See waveform 5)
C53-29 (M ) - A91-17 (E1)	Throttle actuator operation signal (positive terminal)	Idling with warm engine	Pulse generation (See waveform 6)
C53-30 (M-) - A91-17 (E1)	Throttle actuator operation signal (negative terminal)	Idling with warm engine	Pulse generation (See waveform 7)
C53-33 (PRG) - A91-17 (E1)	Purge VSV operation signal	Engine stopped, ignition switch ON	11 to 14 V
C53-33 (PRG) - A91-17 (E1)	Purge VSV operation signal	Idling with warm engine, under purge control	Pulse generation (See waveform 8)
C53-34 (#10) - A91-15 (E01)	No. 1 fuel injector assembly signal	Idling with warm engine	Pulse generation (See waveform 9)
C53-35 (#20) - A91-15 (E01)	No. 2 fuel injector assembly signal	Idling with warm engine	Pulse generation (See waveform 9)
C53-36 (#30) - A91-15 (E01)	No. 3 fuel injector assembly signal	Idling with warm engine	Pulse generation (See waveform 9)
C53-37 (#40) - A91-15 (E01)	No. 4 fuel injector assembly signal	Idling with warm engine	Pulse generation (See waveform 9)
C53-41 (OC1 ) - C53-40 (OC1-)	Camshaft timing oil control valve assembly operation signal	Idling	Pulse generation (See waveform 10)
C53-42 (EGR4) - A91-17 (E1)	EGR valve assembly signal	EGR valve assembly operating	Pulse generation (See waveform 11)
C53-43 (EGR2) - A91-17 (E1)	EGR valve assembly signal	EGR valve assembly operating	Pulse generation (See waveform 11)
C53-44 (EGR3) - A91-17 (E1)	EGR valve assembly signal	EGR valve assembly operating	Pulse generation (See waveform 11)
C53-45 (EGR1) - A91-17 (E1)	EGR valve assembly signal	EGR valve assembly operating	Pulse generation (See waveform 11)
C53-56 (HT1B) - A91-17 (E1)	Heated oxygen sensor heater operation signal	Engine stopped, ignition switch ON	11 to 14 V
C53-56 (HT1B) - A91-17 (E1)	Heated oxygen sensor heater operation signal	Idling with cold engine	Below 3.0 V
C53-70 (WPI) - A91-17 (E1)	Electric water pump assembly signal	Idling with warm engine	Pulse generation (See waveform 12)
C53-71 (WPO) - A91-17 (E1)	Electric water pump assembly signal	Idling with warm engine	Pulse generation (See waveform 13)
C53-72 (IGT4) - A91-17 (E1)	No. 4 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 14)
C53-73 (IGT3) - A91-17 (E1)	No. 3 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 14)
C53-74 (IGT2) - A91-17 (E1)	No. 2 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 14)
C53-75 (IGT1) - A91-17 (E1)	No. 1 ignition coil assembly signal (ignition signal)	Idling with warm engine	Pulse generation (See waveform 14)
C53-80 (NE ) - C53-81 (NE-)	Crankshaft position sensor signal	Idling with warm engine	Pulse generation (See waveform 15)
C53-82 (VCNE) - A91-17 (E1)	Power source of crankshaft position sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
C53-87 (PIM) - C53-88 (EPIM)	Manifold absolute pressure sensor signal	Engine stopped, ignition switch ON	3.0 to 4.5 V
C53-89 (VCPM) - C53-88 (EPIM)	Power source of manifold absolute pressure sensor	Engine stopped, ignition switch ON	4.75 to 5.25 V
C53-92 (KNK1) - C53-91 (EKNK)	Knock control sensor signal	Engine speed maintained at 2500 rpm after warming up engine	Pulse generation (See waveform 16)
C53-100 (OX1B) - C53-99 (O1B-)	Heated oxygen sensor signal	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine	Pulse generation (See waveform 17)
C53-101 (VTA2) - C53-133 (ETA)	Throttle position sensor signal (for sensor malfunction detection)	Engine stopped, ignition switch ON, accelerator pedal fully released	2.1 to 3.1 V
C53-108 (VCVG) - A91-17 (E1)	Power source of mass air flow meter sub-assembly (specific voltage)	Ignition switch ON	4.8 to 5.2 V
C53-110 (VV1 ) - C53-113 (VV1-)	Camshaft position sensor signal	Idling with warm engine	Pulse generation (See waveform 18)
C53-114 (VCV1) - A91-17 (E1)	Power source of camshaft position sensor	Engine stopped, ignition switch ON	4.5 to 5.5 V
C53-124 (THW) - C53-123 (ETHW)	Engine coolant temperature sensor signal	Idling, engine coolant temperature 75 to 100°C (167 to 212°F)	0.2 to 1.0 V
C53-131 (A1A-) - A91-17 (E1)	Air fuel ratio sensor signal	Engine stopped, ignition switch ON	2.2 to 2.8 V*1
C53-132 (A1A ) - A91-17 (E1)	Air fuel ratio sensor signal	Engine stopped, ignition switch ON	2.2 to 3.5 V*1
C53-134 (VCTA) - C53-133 (ETA)	Power source of throttle position sensor (specific voltage)	Engine stopped, ignition switch ON	4.5 to 5.5 V
C53-135 (VTA1) - C53-133 (ETA)	Throttle position sensor signal (for engine control)	Engine stopped, ignition switch ON, accelerator pedal fully released	0.6 to 1.1 V
C53-139 (THA) - C53-107 (E2G)	Intake air temperature sensor (mass air flow meter sub-assembly) signal	Idling, intake air temperature 0 to 80°C (32 to 176°F)	0.5 to 3.4 V
C53-140 (VG) - C53-107 (E2G)	Mass air flow meter sub-assembly signal	Ignition switch ON	Pulse generation (See waveform 19)

*1: The ECM terminal voltage is constant regardless of the voltage output from the sensor.

WAVEFORM 1

CAN Communication Signal (Reference)

ECM Terminal Name

Between CFDH and E1

Between CFDT and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 2

CAN Communication Signal (Reference)

ECM Terminal Name

Between CFDL and E1

Between CFDB and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 3

Crankshaft Revolution Signal from ECM to Inverter with Converter Assembly

ECM Terminal Name	Between NEO and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 4

Camshaft Revolution Signal from ECM to Inverter with Converter Assembly

ECM Terminal Name	Between G2O and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 5

Air Fuel Ratio Sensor Heater Operation Signal

ECM Terminal Name	Between HA1A and E1
Tester Range	5 V/DIV., 10 ms./DIV.
Condition	Idling with cold engine

WAVEFORM 6

Throttle Actuator Positive Terminal Signal

ECM Terminal Name	Between M and E1
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 7

Throttle Actuator Negative Terminal Signal

ECM Terminal Name	Between M- and E1
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 8

Purge VSV Operation Signal

ECM Terminal Name	Between PRG and E1
Tester Range	10 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine, under purge control

HINT:

If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

WAVEFORM 9

No. 1 (to No. 4) Fuel Injector Assembly Signal

ECM Terminal Name	Between #10 (to #40) and E01
Tester Range	20 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 10

Camshaft Timing Oil Control Valve Assembly Operation Signal

ECM Terminal Name	Between OC1 and OC1-
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling

WAVEFORM 11

EGR Valve Assembly Signal

ECM Terminal Name	Between EGR (1 to 4) and E1
Tester Range	20 V/DIV., 50 ms./DIV.
Condition	EGR valve assembly operating

WAVEFORM 12

Engine Water Pump Assembly Signal (from Engine Water Pump Assembly to ECM)

ECM Terminal Name	Between WPI and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine water pump speed increases.

WAVEFORM 13

Engine Water Pump Assembly Signal (from ECM to Engine Water Pump Assembly)

ECM Terminal Name	Between WPO and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the engine water pump assembly speed.

WAVEFORM 14

Ignition Coil Assembly Signal (IGT Signal)

ECM Terminal Name	Between IGT (1 to 4) and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 15

Crankshaft Position Sensor Signal

ECM Terminal Name	Between NE and NE-
Tester Range	2 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 16

Knock Control Sensor Signal

ECM Terminal Name	Between KNK1 and EKNK
Tester Range	1 V/DIV., 1 ms./DIV.
Condition	Engine speed maintained at 2500 rpm after warming up engine

HINT:

The wavelength becomes shorter as the engine speed increases.
The waveforms and amplitudes displayed will differ slightly depending on the Toyota Prius vehicle.

WAVEFORM 17

Heated Oxygen Sensor Signal

ECM Terminal Name	Between OX1B and O1B-
Tester Range	0.2 V/DIV., 200 ms./DIV.
Condition	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

HINT:

Data List item "O2 Sensor Voltage B1S2" shows the ECM values from the heated oxygen sensor.

WAVEFORM 18

Camshaft Position Sensor Signal

ECM Terminal Name	Between VV1 and VV1-
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 19

Mass Air Flow Meter Sub-assembly Signal

ECM Terminal Name	Between VG and E2G
Tester Range	1 V/DIV., 100 μs./DIV.
Condition	Ignition switch ON

Diagnosis System

DIAGNOSIS SYSTEM

EURO-OBD (EUROPEAN SPEC.)

When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, the vehicle must be connected to an OBD scan tool (complying with ISO 15765-4). Various data output from the Toyota Prius vehicle's ECM can then be read.

Euro-OBD regulations require that the vehicle's on-board computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:

The emission control system and components.
The powertrain control components (which affect Toyota Prius vehicle emissions).
The computer.

In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15765-4 are stored in the ECM memory. If the malfunction does not reoccur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain stored in the ECM memory.

To check for DTCs, connect the GTS or OBD scan tool to the Data Link Connector 3 (DLC3) of the Toyota Prius vehicle.

The GTS displays DTCs, the freeze frame data and a variety of engine data.

The DTCs and freeze frame data can be cleared using the GTS.

Click here

NORMAL MODE AND CHECK MODE

The diagnosis system operates in normal mode during normal Toyota Prius vehicle use. In normal mode, 2 trip detection logic is used to ensure accurate detection of malfunctions. Check mode is also available as an option for technicians. In check mode, 1 trip detection logic is used for duplicating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent problems (GTS only).

2 TRIP DETECTION LOGIC

When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the subsequent drive cycle, the MIL is illuminated (2nd trip).

DLC3 (Data Link Connector 3)

(a) Check the DLC3.

Click here

FREEZE FRAME DATA

The ECM records Toyota Prius vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

AUXILIARY BATTERY VOLTAGE

Standard Voltage:

11 to 16 V

If the voltage is less than 11 V, recharge or replace the auxiliary battery.

MIL (Malfunction Indicator Lamp)

(a) The MIL is illuminated when the ignition switch is turned ON (with the engine is not running).

(b) The MIL will turn off when the ignition switch is turned ON (READY). If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.

HINT:

If the MIL does not illuminate when the ignition switch is turned ON, check the MIL circuit.

Click here

ALL READINESS

HINT:

With "All Readiness", you can use the GTS to check whether or not DTC judgment has been completed.
You should check "All Readiness" after simulating malfunction symptoms or for validation after finishing repairs.

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(b) Turn the ignition switch off and wait for at least 30 seconds.

(d) Perform the DTC judgment driving pattern to run the DTC judgment.

(e) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display
All Readiness

(f) Input the DTCs to be confirmed.

(g) Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform the driving pattern after confirming DTC enabling conditions

Diagnosis Related Information

HINT:

If the detection conditions of certain DTCs are met before a malfunction can be confirmed, the ECM will store Diagnosis Related Information. Toyota Prius Vehicle condition information from when the detection conditions were met can be checked using the Diagnosis Related Information. Diagnosis Related Information should be used as a reference only, and should not be relied upon solely when determining whether a part is faulty or not.
Clearing DTCs will also clear Diagnosis Related Information.
DTCs and Diagnosis Related Information are saved in the GTS at the same time.

(a) Enter the following menus: Powertrain / Engine / Utility / Diagnosis Related Information.

Powertrain > Engine > Utility

Tester Display
Diagnosis Related Information

(b) Select a Diagnosis Related Information item to display it' s details.

Dtc Check / Clear

DTC CHECK / CLEAR

NOTICE:

When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and freeze frame data recorded in normal mode are cleared. Before changing modes, always check and make a note of DTCs and freeze frame data.

HINT:

DTCs which are stored in the ECM can be displayed on the GTS. The GTS can display the confirmed and pending DTCs.
Some DTCs are not stored if the ECM does not detect the same malfunction again during a second consecutive driving cycle. However, such malfunctions, detected on only one occasion, are stored as pending DTCs.

CHECK DTC

(a) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

(b) Check the DTC(s) and freeze frame data, and then write them down.

GTS Display	Description
Test Failed	Shows the malfunction judgment results during the current trip.
Pending	Shows the malfunction judgment results up to now. (Indicates the possibility of a malfunction when no DTC is confirmed.)
Confirmed	Shows the DTCs confirmed up to now. (The number of current trips differs for each DTC.)

Click here

CHECK TIME STAMP

HINT:

By checking Time Stamp, the time and order in which DTCs were stored in an ECU can be checked.

(a) Enter the following menus: Health Check.

(b) Perform the following steps when the data setting screen is displayed.

Selectable items:

Powertrain
Chassis
Body
Store All Data

(d) Select "Yes" when "Do you want to store time stamp data?" is displayed.

HINT:

If "Yes" is not selected, time stamp data will not be stored.

(e) After Health Check has completed, select "Time Stamp Data" to display the Time Stamp screen.

(f) Select the desired system from the drop-down list on the bottom of the Time Stamp screen.

(g) Check the order and time which DTCs were stored for the selected system.

CLEAR DTC

(a) Enter the following menus: Powertrain / Engine / Trouble Codes.

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

CLEAR DTC (Without using GTS)

(a) Perform either of the following operations:

NOTICE:

After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here

(1) Disconnect the cable from the negative (-) auxiliary battery terminal for more than 1 minute.

(2) Remove the EFI-MAIN and ETCS fuses from the No. 1 engine room relay block and No. 1 junction block assembly located inside the engine compartment for more than 1 minute.

Freeze Frame Data

FREEZE FRAME DATA

DESCRIPTION

The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT:

If it is impossible to replicate the problem even though a DTC is detected, confirm the freeze frame data.
Freeze frame data is available in long and short forms.

PENDING FREEZE FRAME DATA

HINT:

Pending freeze frame data is stored when a 2 trip detection logic DTC is first detected during the first trip.

(a) Enter the following menus: Powertrain / Engine / Trouble Codes.

(b) Select a DTC in order to display its pending freeze frame data.

Powertrain > Engine > Trouble Codes

HINT:

Pending freeze frame data is cleared when any of the following occurs.
- Using the GTS, the DTCs cleared.
- The cable is disconnected from the negative (-) auxiliary battery terminal.
- 40 trips with the engine fully warmed up have been performed after returning to normal. (Pending freeze frame data will not be cleared by only returning the system to normal.)
With previous pending freeze frame data stored, if pending freeze frame data is newly stored when a 2 trip detection logic DTC is detected in the first trip, the old freeze frame data will be replaced with the new data of the newly detected DTC in the next trip.

LIST OF FREEZE FRAME DATA

Powertrain > Engine

Tester Display
Total Distance Traveled
Total Distance Traveled - Unit
Key Cycle
Elapsed Time
Toyota Prius Vehicle Speed
Engine Speed
Calculate Load
Vehicle Load
Mass Air Flow Sensor
Atmospheric Pressure
Intake Manifold Absolute Pressure
Intake Manifold Absolute Pressure Supported
Coolant Temperature
Intake Air Temperature
Ambient Temperature
Engine Run Time
IG-ON Coolant Temperature
Initial Engine Coolant Temperature
IG-ON Intake Air Temperature
Initial Engine Intake Air Temperature
Battery Voltage
BATT Voltage
IG2 / IGP
IGR
Intake Camshaft Position Sensor Voltage
Intake Camshaft Position Sensor Speed Bank 1
Crankshaft Position Sensor Voltage
Throttle Position Sensor No.1 Voltage %
Throttle Position Sensor No.2 Voltage %
System Guard
Open Side Malfunction
Throttle Request Position
Throttle Sensor Position
Throttle Position Sensor No.1 Voltage
Throttle Position Sensor No.2 Voltage
Throttle Position Command
Throttle Position Sensor Open Position No.1
Throttle Position Sensor Open Position No.2
Throttle Motor Current
Throttle Motor Duty Ratio
Throttle Motor Duty Ratio (Open)
Throttle Motor Duty Ratio (Close)
Throttle Position Sensor Fully Closed Learn Value
BM Voltage
Actuator Power Supply
Throttle Air Flow Learn Value (Area 1)
Throttle Air Flow Learn Value (Area 2)
Throttle Air Flow Learn Value (Area 3)
Throttle Air Flow Learn Value (Calculated Value)
Throttle Air Flow Learn Value (Atmosphere Pressure Offset Value)
Low Revolution Control
Engine Stall Control F/B Flow
Injector Cylinder #1 (Port)
Injection Volume Cylinder #1
Injection Volume
Fuel Pump/Speed Status
Current Fuel Type
EVAP (Purge) VSV
Fuel Lid SW
Target Air-Fuel Ratio
A/F (O2) Lambda Sensor B1S1
A/F (O2) Sensor Current B1S1
A/F (O2) Sensor Heater Duty Ratio B1S1
A/F Sensor Impedance B1S1
O2 Sensor Voltage B1S2
A/F (O2) Sensor Heater Current-Carrying Status B1S2 (at Heater OFF)
A/F (O2) Sensor Heater Overcurrent B1S2
A/F (O2) Sensor Heater Control Run Time B1S2
A/F (O2) Sensor Terminal Voltage Bank 1
A/F (O2) Sensor -Terminal Voltage Bank 1
A/F (O2) Sensor Heater Control Duty Ratio Bank1
A/F (O2) Sensor Heater Output Duty Ratio Bank1
A/F (O2) Sensor Heater ON Current Value Bank1
A/F (O2) Sensor Heater Current-Carrying Status Bank1 (at Heater OFF)
A/F (O2) Sensor Heater Overcurrent Bank1
A/F (O2) Sensor Heater Control Run Time Bank1
A/F (O2) Sensor Impedance B1S2
O2 Sensor Heater B1S2
A/F (O2) Sensor Heater Current Value B1S2
Short FT B1S1
Short FT B1S2
Long FT B1S1
Long FT B1S2
Total FT Bank 1
Fuel System Status Bank 1
Fuel System Status Bank 2
Ignition Timing Cylinder #1
Knock F/B Value
Knock Correct Learn Value
Idle Spark Advance Control Cylinder #1
Idle Spark Advance Control Cylinder #2
Idle Spark Advance Control Cylinder #3
Idle Spark Advance Control Cylinder #4
Mass Air Flow Circuit
Air Flow Meter Output Frequency
Target EGR Valve Position No.1
Target EGR Valve Position No.1 Supported
Actual EGR Valve Position No.1 Supported
Target EGR Valve Position No.2 Supported
Actual EGR Valve Position No.2 Supported
EGR Step Position
VVT Advance Fail
Intake VVT Hold Learn Value Bank 1
Intake VVT Change Angle Bank 1
Intake VVT OCV Control Duty Ratio Bank 1
Intake VVT Target Angle Bank 1
Intake VVT Timing Most Over-Retarded Learn Value Bank 1
Catalyst Temperature B1S1
Catalyst Temperature B1S2
TC Terminal
MIL ON Run Distance
Running Time from MIL ON
Time after DTC Cleared
Distance from DTC Cleared
Warmup Cycle Cleared DTC
Distance Traveled from Last Battery Cable Disconnect
IG OFF Elapsed Time
Soak IC Current Timer Value
Ignition Trigger Count
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4
All Cylinders Misfire Count
Misfire RPM
Misfire Load
Misfire Margin
Catalyst OT Misfire Fuel Cut
Catalyst OT Misfire Fuel Cut History
Catalyst OT Misfire Fuel Cut Cylinder #1
Catalyst OT Misfire Fuel Cut Cylinder #2
Catalyst OT Misfire Fuel Cut Cylinder #3
Catalyst OT Misfire Fuel Cut Cylinder #4
IG ON Duration Time
IG OFF Duration Time
Engine Start Hesitation
Low Revolution for Engine Start
A/F Learn Value Idle Bank 1
A/F Learn Value Low Bank 1
A/F Learn Value Mid No.1 Bank 1
A/F Learn Value Mid No.2 Bank 1
A/F Learn Value High Bank 1
Engine ECU Internal Temperature
Engine Cooling Fan
Engine Speed Cylinder #1
Engine Speed Cylinder #2
Engine Speed Cylinder #3
Engine Speed Cylinder #4
Average Engine Speed of All Cylinder
Requested Engine Torque
HV Target Engine Speed
Actual Engine Torque
Engine Driving Time
Request Engine Run Time
Judge Time Engine Ignition
Judge Time Engine Output
Fuel Level
ISC Learning Value
ISC Learning
F/C for Engine Stop Req
Engine Independent
Racing Operation
Request Warm-up
Engine Independent Control
Electric Water Pump Target Speed
Electric Water Pump Speed

Check Mode Procedure

CHECK MODE PROCEDURE

HINT:

Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect malfunctions that cannot be detected in normal mode.

NOTICE:

All of the stored DTCs and freeze frame data are cleared if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the ignition switch is turned from ON to ACC or off while in check mode. Before changing modes, always check for and note any DTCs and freeze frame data.

CHECK MODE PROCEDURE

(a) Check and ensure the following conditions:

(1) Auxiliary battery voltage is 11 V or higher.

(2) Accelerator pedal fully released.

(3) Park (P) is selected.

(4) A/C switch is off.

(b) Turn the ignition switch off.

(d) Enter the following menus: Powertrain / Engine / Utility / Check Mode.

Powertrain > Engine > Utility

Tester Display
Check Mode

(e) Change the ECM from normal mode to check mode.

(f) Check that the MIL flashes as shown in the illustration.

(g) Turn the ignition switch ON (READY).

(h) Check that the MIL turns off.

(i) Simulate the conditions of the malfunction described by the customer.

(j) Check for DTCs and freeze frame data using the GTS.

Fail-safe Chart

FAIL-SAFE CHART

If any of the following DTCs are stored, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily or stops fuel injection.

DTC Code	Component	Fail-Safe Operation	Fail-Safe Deactivation Condition
P001100	VVT system	Idle up (control of combustion decreased).	Pass condition detected
P003012 P003013 P101A9E	Air fuel ratio sensor heater	The ECM turns off the air fuel ratio sensor heater.	Ignition switch off
P003612 P003614 P102A9E	Heated oxygen sensor heater	The ECM turns off the heated oxygen sensor heater.	Ignition switch off
P006900 P222611 P222615 P222687 P222696	Manifold absolute pressure sensor Atmospheric pressure sensor (ECM)	The ECM maintains the last learned atmospheric pressure value.	Pass condition detected
P010012 P010014	Mass air flow meter sub-assembly	The ECM calculates ignition timing according to the engine speed and throttle valve position.	Pass condition detected
P010511 P010515	Manifold absolute pressure sensor	The ECM disables EGR valve operation	Pass condition detected
P011011 P011015	Intake air temperature sensor	The ECM estimates the intake air temperature to be 20°C (68°F).	Pass condition detected
P011511 P011515 P01152A	Engine coolant temperature sensor	The ECM estimates the engine coolant temperature to be 80°C (176°F).	Pass condition detected
P012011 P012015 P01201C P022011 P022015 P060444 P060647 P060747 P060787 P060E49 P065714 P06579E P16B09F P210018 P210019 P211900 P211904 P211977 P21199B P21352B	Electronic throttle control system	The ECM cuts off throttle actuator current and the throttle valve is returned to a 6.5° throttle position by the return spring. The ECM controls the fuel injection duration and ignition timing in accordance with the engine torque requested by the hybrid Toyota Prius vehicle control ECU. Fuel-cut is performed intermittently.*1	Pass condition detected and then ignition switch turned off
P030000 P030027 P030085 P030100 P030200 P030300 P030400 *2	Fuel injector assembly Electronic throttle control system	When a catalyst-damaging misfire occurs (MIL blinking), the following fail-safe operation is performed for catalyst overheat malfunction prevention. Under a low load and at a low engine speed: - Fuel cut is performed on the malfunctioning cylinder. Under a high load and at a high engine speed: - Throttle valve opening angle control is performed. - Fuel cut is performed on all cylinders or the malfunctioning cylinder.	Pass condition detected and then ignition switch turned off
P032511 P032515	Knock control sensor	The ECM sets the ignition timing to maximum retard.	Ignition switch off
P04019C P040314 P140000 P140596 P141004	EGR valve assembly	The ECM fully closes the EGR valve and stops EGR control.	Pass condition detected
P211172 P211173	Electronic throttle control system	The ECM stops the engine and the Toyota Prius vehicle can be driven using solely the hybrid system.*1	Pass condition detected and then ignition switch turned off
P223700 P223711 P223712 P223713 P22371B P225111 P225112	Air fuel ratio sensor	Air fuel ratio feedback control is stopped.	Pass condition detected and then ignition switch turned off
P26CA12 P26CA31 P26CB71	Inverter water pump with motor assembly	When the engine coolant temperature reaches 105°C (221°F), the engine speed is limited to 2500 rpm or less. Output duty ratio of the WPO terminal repeats a cycle of 0% for 0 to 5 seconds and then 85% for 5 to 30 seconds.	Pass condition detected and then ignition switch is turned off
P26CA14	Inverter water pump with motor assembly	When the engine coolant temperature reaches 105°C (221°F), the engine speed is limited to 2500 rpm or less. Output duty ratio of the WPOterminal repeats a cycle of 0%for 0 to 5 seconds and then85% for 5 to 30 seconds.	Pass condition detected and then ignition switch is turned off
P26CE37	Inverter water pump with motor assembly	The inverter water pump with motor assembly is temporarily operated and stopped in a repeating cycle. Output duty ratio of the WPO terminal repeats a cycle of 0% for 0 to 5 seconds and then 85% for 5 to 30 seconds.	Pass condition detected and then ignition switch is turned off

HINT:

*1: The Toyota Prius vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly.
*2: Misfire-related fail-safe operations occur when catalyst overheat malfunctions occur.

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

HINT:

Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

(d) Turn the A/C switch off.

(e) Turn the ignition switch off.

(f) Turn the ignition switch ON.

(g) Enter the following menus: Powertrain / Engine / Data List.

HINT:

To display the list box, press the pull down menu button next to Primary. Then select a measurement group.
When you select a measurement group, the ECU data belonging to that group is displayed.
Measurement Group List / Description
- All Data / All data
- Primary / -
- Engine Control / Engine control system related data
- Ptrl General / -
- Ptrl AF Control / Air fuel ratio control system related data
- Ptrl AF O2 Sensor / Air fuel ratio sensor and heated oxygen sensor related data
- Ptrl Throttle / Gasoline throttle system related data
- Ptrl Intake Control / Intake control system related data
- Ptrl Valve Control / Valve control system related data
- Ptrl Misfire / "Misfire" related data
- Ptrl Starting / "Difficult to start" related data
- Ptrl Rough Idle / "Rough idle" related data
- Ptrl Evaporative / Evaporative system related data
- Ptrl CAT Converter / Catalyst converter related data
- Check Mode / Check mode related data
- Monitor Status / Monitor status related data
- Ignition / Ignition system related data
- Charging Control / Charging control system related data
- Compression / Data used during "Check the Cylinder Compression" Active Test
- AT / Automatic transaxle system related data
- Toyota Prius Vehicle Information / Vehicle information

(h) Read the Data List according to the display on the GTS.

HINT:

The title used for each group of Data List items in this repair manual does not appear on the GTS. However, the name in parentheses after the title, which is a Measurement Group, does appear on the GTS. When the name shown in parentheses is selected on the GTS, all of the Data List items listed for that group will be displayed.

Various Toyota Prius Vehicle Conditions 1 (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Total Distance Traveled	Total distance traveled	Min.: 0, Max.: 16777215	-	-
Total Distance Traveled - Unit	Total Distance Traveled unit	km or mile	-	-
Toyota Prius Vehicle Speed	Vehicle speed	Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Actual vehicle speed	This is the current vehicle speed.
Engine Speed	Engine speed	Min.: 0 rpm, Max.: 16383 rpm	950 to 1050 rpm: Idling with warmed up engine (inspection mode [maintenance mode], not charge control, park (P) selected)	When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.
Calculate Load	Load calculated by ECM	Min.: 0%, Max.: 100%	20 to 40%: Idling with warmed up engine (inspection mode [maintenance mode], not charge control) 15 to 35%: Warmed up engine, 2500 rpm (inspection mode [maintenance mode])	This is the engine load calculated based on the estimated intake manifold pressure. Calculate Load = Actual intake manifold pressure / maximum intake manifold pressure x 100 (%) (For example, when the actual intake manifold pressure is the same as atmospheric pressure, Calculate Load is 100%.)
Toyota Prius Vehicle Load	Vehicle load	Min.: 0%, Max.: 25700%	Actual vehicle load	This is the engine intake air charging efficiency. Toyota Prius Vehicle Load = Current intake airflow (g/rev.) / maximum intake airflow x 100 (%) Maximum intake airflow = Displacement (L) / 2 x 1.2 (g/rev.) HINT: Due to individual engine differences, intake air temperature, etc., the value may exceed 100%. Intake airflow (g/rev.) = Intake airflow (gm/sec) x 60 / Engine speed (rpm) (Intake airflow (gm/sec) is value of Mass Air Flow Sensor)
Mass Air Flow Sensor	Airflow rate from mass air flow meter sub-assembly	Min.: 0 gm/sec, Max.: 655.35 gm/sec	1.0 to 3.0 gm/sec: Idling with warmed up engine (inspection mode [maintenance mode], not charge control) 4.5 to 8.5 gm/sec: Warmed up engine, 2500 rpm (inspection mode [maintenance mode])	This is the intake air amount measured by the mass air flow meter sub-assembly.
Atmospheric Pressure	Atmospheric pressure	Min.: 0 kPa (0 psi), Max.: 255 kPa (37 psi)	Equivalent to atmospheric pressure	This value is calculated based on the atmospheric pressure sensor. Standard atmospheric pressure: 101 kPa(abs) [15 psi(abs)] For every 100 m (328 ft) increase in altitude, pressure drops by 1 kPa (0.1 psi). This varies depending on the weather.
Intake Manifold Absolute Pressure	Intake manifold absolute pressure	Min.: 0 kPa (0 psi), Max.: 2047.96 kPa (296.95 psi)	80 to 110 kPa(11.6 to 15.95 psi): Ignition switch ON 20 to 40 kPa(2.9 to 5.8 psi): Idling with warmed up engine (inspection mode [maintenance mode], not charge control)	This is the intake manifold pressure. This item is the pressure detected by the manifold absolute pressure sensor and is used for air fuel ratio control and EGR valve control. HINT: When the ignition switch ON, the manifold absolute pressure and atmospheric pressure are approximately the same (standard atmospheric pressure = 101 kPa(abs) [15 psi(abs)]).
Intake Manifold Absolute Pressure Supported	Status of Intake Manifold Absolute Pressure	Unsupp or Supp	Supp	-
Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F), Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. HINT: After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).
Intake Air Temperature	Intake air temperature	Min.: -40°C (-40°F), Max.: 140°C (284°F)	Equivalent to temperature at location of mass air flow meter sub-assembly	This is the engine intake air temperature. HINT: After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Ambient Temperature	Ambient temperature	Min.: -40°C (-40°F), Max.: 215°C (419°F)	Equivalent to ambient temperature	This is the ambient temperature. HINT: After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
Engine Run Time	Engine run time	Min.: 0 sec, Max.: 65535 sec	Time after engine start	This is the time elapsed since the engine is first started with the ignition switch ON (READY). With the ignition switch ON (READY), time measurement will not stop even after the engine stops.
IG-ON Coolant Temperature	Engine coolant temperature when the ignition switch is turned ON	Min.: -40°C (-40°F), Max.: 119.3°C (246.7°F)	-	This is the engine coolant temperature stored when the ignition switch is turned ON.
Initial Engine Coolant Temperature	Engine coolant temperature when the ignition switch is turned ON (READY)	Min.: -40°C (-40°F), Max.: 119.3°C (246.7°F)	-	This is the engine coolant temperature stored when the ignition switch is turned ON (READY).
IG-ON Intake Air Temperature	Intake air temperature when the ignition switch is turned ON	Min.: -40°C (-40°F), Max.: 119.3°C (246.7°F)	-	This is the intake air temperature stored when the ignition switch is turned ON
Initial Engine Intake Air Temperature	Intake air temperature when the ignition switch is turned ON (READY)	Min.: -40°C (-40°F), Max.: 119.3°C (246.7°F)	-	This is the intake air temperature stored when the ignition switch is turned ON (READY).
Battery Voltage	Auxiliary battery voltage	Min.: 0 V, Max.: 65.5 V	11 to 16 V: Ignition switch ON	If 11 V or less, characteristics of some electrical components may change.
BATT Voltage	Auxiliary battery voltage	Min.: 0 V, Max.: 79.998 V	11 to 16 V: Ignition switch ON	If 11 V or less, characteristics of some electrical components may change.
IG2 / IGP	Status of IGP terminal	ON or OFF	ON: Ignition switch ON	-
IGR	Status of IGR terminal	ON or OFF	ON: Ignition switch ON	-
Intake Camshaft Position Sensor Voltage	Camshaft position sensor voltage	Min.: 0 V, Max.: 4.999 V	-	-
Intake Camshaft Position Sensor Speed Bank 1	Intake camshaft speed	Min.: 0 rpm, Max.: 65535 rpm	-	-
Crankshaft Position Sensor Voltage	Crankshaft position sensor voltage	Min.: 0 V, Max.: 4.999 V	-	-

Throttle Control (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Throttle Position Sensor No.1 Voltage %	Absolute No. 1 throttle position sensor	Min.: 0%, Max.: 100%	10 to 22%: Ignition switch ON, accelerator pedal fully released	The No. 1 throttle position sensor output is converted using 5 V = 100%. HINT: If there are no throttle position sensor DTCs stored, it is possible to conclude that the throttle position sensor system is normal.
Throttle Position Sensor No.2 Voltage %	Absolute No. 2 throttle position sensor	Min.: 0%, Max.: 100%	42 to 62%: Ignition switch ON, accelerator pedal fully released	The No. 2 throttle position sensor output is converted using 5 V = 100%.
System Guard	System guard	ON or OFF	ON: Idling or throttle actuator operating	When there is a difference between the target and actual throttle valve opening angle, this item changes to OFF and the electronic throttle control system operation is disabled. OFF: Electronic throttle control is stopped. After the ignition switch is turned ON (READY), OFF will be displayed until the throttle valve is first operated.
Open Side Malfunction	Open malfunction	ON or OFF	OFF	This item indicates a malfunction in the electronic throttle when the throttle valve is open.
Throttle Request Position	Required throttle position	Min.: 0 V, Max.: 4.98 V	0.6 to 1.1 V: Idling with warmed up engine (inspection mode [maintenance mode])	The value of this item is calculated by the ECM and shows the voltage for the target throttle valve position.
Throttle Sensor Position	Throttle sensor position	Min.: 0%, Max.: 100%	-	-
Throttle Position Sensor No.1 Voltage	No. 1 throttle position sensor output voltage	Min.: 0 V, Max.: 4.98 V	0.6 to 1.1 V: Ignition switch ON, accelerator pedal fully released 0.6 to 1.4 V: Fail-safe operating	This is the No. 1 throttle position sensor output voltage.
Throttle Position Sensor No.2 Voltage	No. 2 throttle position sensor output voltage	Min.: 0 V, Max.: 4.98 V	2.1 to 3.1 V: Ignition switch ON, accelerator pedal fully released 2.1 to 3.1 V: Fail-safe operating	This is the No. 2 throttle position sensor output voltage.
Throttle Position Command	Throttle position command value	Min.: 0 V, Max.: 4.98 V	0.6 to 1.1 V: Idling with warmed up engine (inspection mode [maintenance mode])	The value displayed for this item is the same as Throttle Request Position.
Throttle Position Sensor Open Position No.1	No. 1 throttle position sensor	Min.: 0 V, Max.: 4.98 V	0.6 to 1.4 V	This is the No. 1 throttle position sensor output voltage when there is no current supplied to the electronic throttle actuator. If the accelerator pedal is released the throttle valve is kept open by the throttle valve opener when the ignition switch ON.
Throttle Position Sensor Open Position No.2	No. 2 throttle position sensor	Min.: 0 V, Max.: 4.98 V	1.7 to 2.5 V	This is the No. 2 throttle position sensor output voltage when there is no current supplied to the electronic throttle actuator. If the accelerator pedal is released the throttle valve is kept open by the throttle valve opener when the ignition switch ON.
Throttle Motor Current	Throttle actuator current	Min.: 0 A, Max.: 19.9 A	0 to 3.0 A: Idling with warmed up engine (inspection mode [maintenance mode])	When the value of this item is large but the actual opening angle (Throttle Position Sensor No.1 Voltage) does not reach the target opening angle (Throttle Request Position), there is an "unable to open" malfunction.
Throttle Motor Duty Ratio	Throttle actuator	Min.: 0%, Max.: 100%	10 to 22%: Idling with warmed up engine (inspection mode [maintenance mode])	This is the output duty ratio of the throttle actuator drive circuit.
Throttle Motor Duty Ratio (Open)	Throttle actuator duty ratio (open)	Min.: 0%, Max.: 255%	0 to 40%: Idling with warmed up engine (inspection mode [maintenance mode])	This is the duty ratio used to drive the throttle actuator and open the throttle valve. It is an ECM command signal.
Throttle Motor Duty Ratio (Close)	Throttle actuator duty ratio (close)	Min.: 0%, Max.: 255%	0 to 40%: Idling with warmed up engine (inspection mode [maintenance mode])	This is the duty ratio used to drive the throttle actuator and close the throttle valve. It is an ECM command signal. HINT: During idle, the throttle valve opening angle is usually controlled using a duty ratio drive signal which closes the throttle valve. However, if carbon deposits have built up, it may be necessary to open the throttle valve more than the throttle valve opener does. In that case, the opening angle is controlled using the Throttle Motor Duty Ratio (Open) signal.
Throttle Position Sensor Fully Closed Learn Value	Throttle valve fully closed position (learned value)	Min.: 0 V, Max.: 4.98 V	0.4 to 1.0 V: Ignition switch ON, accelerator pedal fully released	The ECM uses this learned value to determine the fully closed (and fully open) position of the throttle valve. The ECM calculates the learned value based on the position of the throttle valve when the accelerator pedal is released and the throttle valve motor is not operating. Learning is performed immediately after the ignition switch is turned ON.
BM Voltage	BM voltage	Min.: 0 V, Max.: 79.998 V	11 to 16 V: Ignition switch ON	This is the power supply for the electronic throttle actuator. When the power supply is interrupted for approximately 1 second, DTCs P065714 (open circuit) and P06579E (short circuit, ECU malfunction) are stored and the electronic throttle control system enters fail-safe mode (normal operation is not restored until the ignition switch is turned off).
Actuator Power Supply	Actuator power supply	ON or OFF	ON: Engine running or throttle actuator operating	-
Throttle Air Flow Learn Value (Area 1)	Throttle air flow learning value of area 1	Min.: 0, Max.: 1.99	-	-
Throttle Air Flow Learn Value (Area 2)	Throttle air flow learning value of area 2	Min.: 0, Max.: 1.99	-	-
Throttle Air Flow Learn Value (Area 3)	Throttle air flow learning value of area 3	Min.: 0, Max.: 1.99	-	-
Throttle Air Flow Learn Value (Calculated Value)	Throttle air flow learning value (calculated value)	Min.: 0, Max.: 1.99	-	-
Throttle Air Flow Learn Value (Atmosphere Pressure Offset Value)	Throttle air flow learning value (atmosphere pressure offset value)	Min.: 0, Max.: 2.55	-	-

Idle Speed Control (Ptrl Rough Idle)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Low Revolution Control	Low engine speed control operation state	ON or OFF	OFF	This item indicates whether the engine speed dropped immediately after starting due to poor combustion, etc.
Engine Stall Control F/B Flow	ISC torque lower limit value to prevent engine stall	Min.: -1024 Nm, Max.: 1023.96 Nm	-	The intake air amount and ignition timing are adjusted when there is a large decrease in engine speed (for example, a decrease to 550 rpm or less) in order to prevent the engine from stalling. For use when the starting problems or rough idle is present.

Fuel System (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Injector Cylinder #1 (Port)	Injection period of the No. 1 cylinder	Min.: 0 μs, Max.: 65535 μs	1000 to 3000 μs: Idling with warmed up engine (inspection mode [maintenance mode], not charge control)	This is the injection period of the No. 1 cylinder (the command value from the ECM).
Injection Volume Cylinder #1	Injection volume (cylinder 1)	Min.: 0 ml, Max.: 2 ml	0.03 to 0.13 ml: Idling with warmed up engine (inspection mode [maintenance mode], not charge control)	This is the fuel injection volume for 10 injections.
Injection Volume	Fuel injection volume	Min.: -25%, Max.: 24.8%	-	Active Test [Control the Injection Volume for A/F Sensor] support data.
Engine Fuel Rate	Fuel consumption (engine)	Min.: 0 gm/sec, Max.: 1310.7 gm/sec	-	-
Toyota Prius Vehicle Fuel Rate	Fuel consumption (vehicle)	Min.: 0 gm/sec, Max.: 1310.7 gm/sec	-	-
Fuel Pump/Speed Status	Fuel pump status	ON or OFF	ON: Engine running	-
Current Fuel Type	Current fuel type	-	Gasoline/petrol	-

EVAP System (Ptrl Evaporative)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
EVAP (Purge) VSV	Purge VSV control duty	Min.: 0%, Max.: 100%	10 to 70%: Idling with warmed up engine (inspection mode [maintenance mode])	This is the command signal from the ECM. This is the purge VSV control duty ratio. When EVAP (Purge) VSV is any value except 0%, EVAP purge* is being performed. *: Gasoline vapor from the fuel tank is being introduced into the intake system via the purge VSV. When the engine is cold or immediately after the engine is started, EVAP (Purge) VSV will be 0%.
EVAP Purge Flow	Purge flow	Min.: 0%, Max.: 399.9%	-	This is the percentage of total engine airflow contributed by EVAP purge operation. (Evap Purge Flow = Purge flow / Engine airflow x 100 (%))
EVAP Purge Density Learn Value	Purge density learned value	Min.: -200, Max.: 199.993	-	This is the proportion of the decrease in injection volume (based on the change in the air fuel ratio feedback compensation value) related to a 1% purge flow rate. When the value of this item is a large negative value, the purge effect is large. The purge density is determined from the change in the air fuel ratio feedback compensation value when purge flow is introduced. Purge density learning is performed so that the feedback compensation value is 0 /-2%. HINT: Usually, the value is approximately /-1. 1: The concentration of HC in the purge gas is relatively low. 0: The concentration of HC in the purge gas is approximately equal to the stoichiometric air fuel ratio. A large negative value indicates that the concentration of HC in the purge gas is relatively high.
Fuel Lid SW	Fuel lid courtesy switch status	Open or Close	Open: Fuel lid opener switch pushed Close: Fuel lid opener switch not pushed	This item is displayed only with Canister Pump Module models.
EVAP Purge VSV	VSV status for EVAP control	ON or OFF	-	This item is ON when EVAP (Purge) VSV is approximately 30% or higher, and is OFF when the VSV duty ratio is less than 30%.
Purge Cut VSV Duty	Purge VSV duty	Min.: 0%, Max.: 399.9%	-	-

Air Fuel Ratio Control 1 (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Target Air-Fuel Ratio	Target air fuel ratio	Min.: 0, Max.: 2	0.8 to 1.2: During idling (engine warmed up)	This is the target air fuel ratio used by the ECM. 1.0 is the stoichiometric air fuel ratio. Values that are more than 1.0 indicate the system attempting to make the air fuel ratio leaner. Values that are less than 1.0 indicate the system attempting to make the air fuel ratio richer. Target Air-Fuel Ratio and A/F (O2) Lambda Sensor B1S1 are related.

Air Fuel Ratio Control 2 (Ptrl AF O2 Sensor)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
A/F (O2) Lambda Sensor B1S1	Output air fuel ratio associated	Min.: 0, Max.: 1.99	Value less than 1 (0.000 to 0.999) = Rich 1 = Stoichiometric air fuel ratio Value more than 1 (1.001 to 1.999) = Lean	This is the actual air fuel ratio calculated based on the air fuel ratio sensor output.
A/F (O2) Sensor Current B1S1	Air fuel ratio sensor output current	Min.: -128 mA, Max.: 127.99 mA	-0.5 to 0.5 mA: Idling with warmed up engine (inspection mode [maintenance mode])	With a stoichiometric air fuel ratio (for example, during idling after the engine is warmed up), the air fuel ratio sensor current output is approximately -0.5 to 0.5 mA. When the value is outside the range of 0.7 to 2.2 mA when the fuel-cut is being performed, there is a malfunction in the air fuel ratio sensor or sensor circuit.
A/F (O2) Sensor Heater Duty Ratio B1S1	Air fuel ratio sensor heater duty ratio	Min.: 0%, Max.: 399.9%	0 to 100%	When the value of this item is more than 0%, current is being supplied to the heater.
A/F Sensor Impedance B1S1	Air fuel ratio sensor impedance	Min.: 0 ohm, Max.: 21247.67 ohm	5 to 15000 ohm: Idling with warmed up engine (inspection mode [maintenance mode])	-
O2 Sensor Voltage B1S2	Heated oxygen sensor output voltage	Min.: 0 V, Max.: 1.275 V	0 to 1.0 V	This is the output voltage of the heated oxygen sensor. Values close to 0 V indicate an air fuel ratio leaner than the stoichiometric ratio. Values close to 1 V indicate an air fuel ratio richer than the stoichiometric ratio. During air fuel ratio feedback control, the value moves back and forth between 0 and 1 V. Performing the "Control the Injection Volume" or "Control the Injection Volume for A/F Sensor" Active Test enables the technician to check output voltage of the sensor.
A/F (O2) Sensor Heater Current-Carrying Status B1S2 (at Heater OFF)	Air fuel ratio sensor heater off energizing status	ON or OFF	OFF: Ignition switch ON	-
A/F (O2) Sensor Heater Overcurrent B1S2	Air fuel ratio sensor heater overcurrent	ON or OFF	OFF	-
A/F (O2) Sensor Heater Control Run Time B1S2	Time elapsed since air fuel ratio sensor heater control started	Min.: 0 ms, Max.: 536862 ms	-	-
A/F (O2) Sensor Terminal Voltage Bank 1	Air fuel ratio sensor positive terminal voltage	Min.: 0 V, Max.: 79.998 V	-	-
A/F (O2) Sensor -Terminal Voltage Bank 1	Air fuel ratio sensor negative terminal voltage	Min.: 0 V, Max.: 79.998 V	-	-
A/F (O2) Sensor Heater Control Duty Ratio Bank1	Air fuel ratio sensor heater control duty ratio	Min.: -327.68%, Max.: 327.67%	-	This is the air fuel ratio sensor heater duty ratio requested by the ECM. During normal operation, displays the same value as "A/F (O2) Sensor Heater Output Duty Ratio Bank1". When "A/F Sensor Heater Control Duty Ratio Bank1" is other than 0% and "A/F Sensor Heater Control Duty Ratio Bank1" is 0%, the heater has stopped operating due to a malfunction of the air fuel ratio sensor.
A/F (O2) Sensor Heater Output Duty Ratio Bank1	Air fuel ratio sensor heater output duty ratio	Min.: 0%, Max.: 399.99%	-	Actual output "air fuel ratio sensor heater duty ratio". During normal operation, displays the same value as "A/F (O2) Sensor Heater Control Duty Ratio Bank1". When "A/F Sensor Heater Control Duty Ratio Bank1" is other than 0% and "A/F Sensor Heater Control Duty Ratio Bank1" is 0%, the heater has stopped operating due to a malfunction of the air fuel ratio sensor.
A/F (O2) Sensor Heater ON Current Value Bank1	Air fuel ratio sensor heater on output current	Min.: 0 A, Max.: 65.535 A	-0.5 to 0.5 mA: Idling with engine warmed up (inspection mode [maintenance mode], not charge control)	-
A/F (O2) Sensor Heater Current-Carrying Status Bank1 (at Heater OFF)	Air fuel ratio sensor heater off energizing status	ON or OFF	OFF: Ignition switch ON	-
A/F (O2) Sensor Heater Overcurrent Bank1	Air fuel ratio sensor heater overcurrent	ON or OFF	OFF	-
A/F (O2) Sensor Heater Control Run Time Bank1	Time elapsed since air fuel ratio sensor heater control started	Min.: 0 ms, Max.: 65535 ms	-	-
A/F (O2) Sensor Impedance B1S2	Air fuel ratio sensor impedance	Min.: 0 ms, Max.: 21247.67 ohm	5 to 15000 ohm: Idling with warmed up engine (inspection mode [maintenance mode])	-
O2 Sensor Heater B1S2	Heated oxygen sensor heater	Active or Not Act	Active: Heater on	-
A/F (O2) Sensor Heater Current Value B1S2	Heated oxygen sensor current	Min.: 0 A, Max.: 4.999 A	-	When the value of this item is more than 0 A, current is being supplied to the heater.
Short FT B1S1	Short-term fuel trim	Min.: -100%, Max.: 99.21%	-20 to 20%	This item is the "short-term fuel injection volume compensation ratio" used to maintain the air fuel ratio at the stoichiometric ratio using the air fuel ratio sensor for feedback.
Short FT B1S2	Short-term fuel trim	Min.: -100%, Max.: 99.21%	-	-
Long FT B1S1	Long-term fuel trim	Min.: -100%, Max.: 99.21%	-20 to 20%	The ECM will learn the Long FT B1S1 values based on Short FT B1S1. The goal is to keep Short FT B1S1 at 0% to keep the air fuel ratio mixture at the stoichiometric ratio. This item is used to determine whether the system related to air fuel ratio control is malfunctioning. The condition of the system is determined based on the sum of Short FT B1S1 and Long FT B1S1 (excluding times when the system is in transition). 20% or higher: The air fuel ratio may be lean. -20 to 20%: The air fuel ratio can be determined to be normal. -20% or less: The air fuel ratio may be rich. Air fuel ratio feedback learning is divided up according to the engine operating range (engine speed x load), and a separate value is stored for each operating range. "Long FT B1S1" indicates the learned value for the current operating range. [A/F Learn Value Idle Bank 1], [A/F Learn Value Low Bank 1], [A/F Learn Value Mid No.1 Bank 1], [A/F Learn Value Mid No.2 Bank 1] and [A/F Learn Value High Bank 1] indicate the learned values for the different operating ranges. The learned value that is the same as "Long FT B1S1" indicates the current engine operating range.
Long FT B1S2	Long-term fuel trim	Min.: -100%, Max.: 99.21%	-	-
Total FT Bank 1	Total fuel trim	Min.: -0.5, Max.: 0.496	-0.28 to 0.2: Idling with warmed up engine (inspection mode [maintenance mode])	Total FT Bank 1 = Short FT B1S1 Long FT B1S1
Fuel System Status Bank 1	Fuel system status (bank 1)	Unused, OL, CL, OLDrive, OLFault or CLFault	CL: Idling after warming up	OL (Open Loop): Has not yet satisfied conditions to go to closed loop. CL (Closed Loop): Feedback for fuel control. OLDrive: Open loop due to driving conditions (fuel enrichment). OLFault: Open loop due to a detected system fault. CLFault: Closed loop but the air fuel ratio sensor, which is used for fuel control, is malfunctioning. HINT: CL (Closed Loop): During air fuel ratio feedback control, A/F (O2) Lambda Sensor B1S1 is approximately 1.0 and A/F (O2) Sensor Voltage B1S1 is approximately 3.3 V.
Fuel System Status Bank 2	Fuel system status (bank 2)	Unused, OL, CL, OLDrive, OLFault or CLFault	Unused	-
A/F Learn Value Idle Bank 1	Air fuel ratio learn value of idle area	Min.: -50%, Max.: 49.6%	-20 to 20%	Learning is performed when idling with the engine warmed up (engine coolant temperature is 80°C [176°F] or higher).
A/F Learn Value Low Bank 1	Air fuel ratio learn value of low load area	Min.: -50%, Max.: 49.6%	-20 to 20%	Learning is performed when driving with the engine warmed up (engine coolant temperature is 80°C [176°F] or higher) and operating in the low load range (when the range of engine loads is divided into four parts).
A/F Learn Value Mid No.1 Bank 1	Air fuel ratio learn value of middle 1 load area	Min.: -50%, Max.: 49.6%	-20 to 20%	Learning is performed when driving with the engine warmed up (engine coolant temperature is 80°C [176°F] or higher) and operating in the medium load range closer to the low load range (when the range of engine loads is divided into four parts).
A/F Learn Value Mid No.2 Bank 1	Air fuel ratio learn value of middle 2 load area	Min.: -50%, Max.: 49.6%	-20 to 20%	Learning is performed when driving with the engine warmed up (engine coolant temperature is 80°C [176°F] or higher) and operating in the medium load range closer to the high load range (when the range of engine loads is divided into four parts).
A/F Learn Value High Bank 1	Air fuel ratio learn value of high load area	Min.: -50%, Max.: 49.6%	-20 to 20%	Learning is performed when driving with the engine warmed up (engine coolant temperature is 80°C [176°F] or higher) and operating in the high load range (when the range of engine loads is divided into four parts).

Ignition System (Ignition)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ignition Timing Cylinder #1	Ignition timing advance for No. 1 cylinder	Min.: -64 deg, Max.: 63.5 deg	8 to 24 deg: Idling with warmed up engine (inspection mode [maintenance mode], not charge control)	-
Knock F/B Value	Knocking feedback value	Min.: -1024 deg(CA), Max.: 1023.9 deg(CA)	-20 to 0 deg(CA): Driving at 70 km/h (43 mph) (Engine running)	This is the ignition timing retard compensation amount determined by the presence or absence of knocking. Ignition timing = Most retarded timing value1 Knock Correct Learn Value2 Knock F/B Value3 each compensation amount Example: 21 deg(CA) = 10 deg(CA) 14 deg(CA) - 3 deg(CA) 1: The most retarded timing value is a constant determined by the engine speed and engine load. 2: The knock correction learned value is calculated as shown below in order to keep Knock F/B Value as close to -3 deg(CA) as possible. When Knock F/B Value is less than -4 deg(CA), Knock Correct Learn Value is slowly decreased. When Knock F/B Value is higher than -2 deg(CA), Knock Correct Learn Value is slowly increased. 3: The base value is -3 deg(CA) and is adjusted based on the presence or absence of knocking. When there is no knocking, the value is increased, and when knocking is present, the value is decreased. HINT: If Knock F/B Value does not change around the time when knocking occurs even though knocking continues (for example, stays at -3 deg(CA)), it can be determined that knocking is not being detected. Possible Causes: There is a problem with the knock control sensor sensitivity. The knock control sensor is improperly installed. There is a problem with a wire harness.
Knock Correct Learn Value	Knocking correction learned value	Min.: -1024 deg(CA), Max.: 1023.9 deg(CA)	0 to 22 deg(CA): Driving at 70 km/h (43 mph) (Engine running)	Refer to "Knock F/B Value". When there is knocking or a lack of power, compare the values of following items to another Toyota Prius vehicle of the same model. Engine Speed Calculate Load Ignition Timing Cylinder #1 Knock F/B Value Knock Correct Learn Value Knock Correct Learn Value is large: There is no knocking and the ignition timing is advanced. Knock Correct Learn Value is small: Knocking is present and the ignition timing is being retarded. HINT: When knocking continues even though Knock Correct Learn Value is less than that of the Toyota Prius vehicle being used for comparison (in other words, the ignition timing is being retarded but the knocking does not stop), there may be a buildup of deposits or other such problems due to deterioration over time (oil entering the cylinders, poor quality fuel, etc.).
Idle Spark Advance Control Cylinder #1	Individual cylinder timing advance compensation amount (No. 1)	Min.: 0 deg(CA), Max.: 15.93 deg(CA)	-	This is the ignition timing advance compensation amount used to stabilize idling (each cylinder has a separate value). When the speed for a certain cylinder drops, the system advances the timing for that particular cylinder in an attempt to restore the speed and stabilize idling. It may be possible to use this item to help determine specific cylinders which are not operating normally.
Idle Spark Advance Control Cylinder #2	Individual cylinder timing advance compensation amount (No. 2)	Min.: 0 deg(CA), Max.: 15.93 deg(CA)	-	This is the ignition timing advance compensation amount used to stabilize idling (each cylinder has a separate value). When the speed for a certain cylinder drops, the system advances the timing for that particular cylinder in an attempt to restore the speed and stabilize idling. It may be possible to use this item to help determine specific cylinders which are not operating normally.
Idle Spark Advance Control Cylinder #3	Individual cylinder timing advance compensation amount (No. 3)	Min.: 0 deg(CA), Max.: 15.93 deg(CA)	-	This is the ignition timing advance compensation amount used to stabilize idling (each cylinder has a separate value). When the speed for a certain cylinder drops, the system advances the timing for that particular cylinder in an attempt to restore the speed and stabilize idling. It may be possible to use this item to help determine specific cylinders which are not operating normally.
Idle Spark Advance Control Cylinder #4	Individual cylinder timing advance compensation amount (No. 4)	Min.: 0 deg(CA), Max.: 15.93 deg(CA)	-	This is the ignition timing advance compensation amount used to stabilize idling (each cylinder has a separate value). When the speed for a certain cylinder drops, the system advances the timing for that particular cylinder in an attempt to restore the speed and stabilize idling. It may be possible to use this item to help determine specific cylinders which are not operating normally.

Mass Air Flow Meter (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Mass Air Flow Circuit	Status of the mass air flow meter sub-assembly circuit	Normal or Abnormal	Normal	-
Air Flow Meter Output Frequency	Mass air flow meter sub-assembly output frequency	Min.: 0 kHz, Max.: 9.999 kHz	3 to 5 kHz: Idling (A/C off, engine warmed up, inspection mode [maintenance mode], not charge control)	-

EGR System (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Target EGR Valve Position No.1	EGR valve target opening amount	Min.: 0%, Max.: 100%	0%: Idling with warmed up engine (inspection mode [maintenance mode])	When the engine is cold or idling, at engine start, etc., the value is 0%. When the valve is fully closed, the value is 0%. When the valve is fully open, the value is 100%.
Target EGR Valve Position No.1 Supported	Status of Target EGR Valve Position No.1	Unsupp or Supp	Supp	-
Actual EGR Valve Position No.1 Supported	Status of Actual EGR Valve Position No.1	Unsupp or Supp	Unsupp	-
Target EGR Valve Position No.2 Supported	Status of Target EGR Valve Position No.2	Unsupp or Supp	Unsupp	-
Actual EGR Valve Position No.2 Supported	Status of Actual EGR Valve Position No.2	Unsupp or Supp	Unsupp	-
EGR Step Position	EGR step position	Min.: 0 step, Max.: 255 step	-	Active Test [Control the EGR Step Position] support data. When the valve is fully closed, the value is 0 step. When the valve is fully open, the value is 110 step.

VVT Control (Ptrl Valve Control)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
VVT Advance Fail	VVT control failure status	ON or OFF	OFF: Idling	ON: There is an intake VVT timing advance malfunction.
Intake VVT Hold Learn Value Bank 1	Intake VVT hold correct learned value	Min.: 0%, Max.: 399.9%	-	-
Intake VVT Change Angle Bank 1	Intake VVT displacement angle	Min.: 0 DegFR, Max.: 639.9 DegFR	-	-
Intake VVT OCV Control Duty Ratio Bank 1	Camshaft timing oil control valve operation duty	Min.: 0%, Max.: 399.9%	-	-
Intake VVT Target Angle Bank 1	Intake VVT target angle	Min.: 0 DegFR, Max.: 639.9 DegFR	10 DegFR: Idling with warmed up engine (inspection mode [maintenance mode], not charge control)	-
Intake VVT Timing Most Over-Retarded Learn Value Bank 1	Intake VVT maximum retarded angle learned value	Min.: 0 deg(CA), Max.: 639.99 deg(CA)	22 to 47 deg(CA): Idling with engine warmed up (inspection mode [maintenance mode], not charge control)	-

Catalyst (Ptrl CAT Converter)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Engine Exhaust Flow Rate	Exhaust flow rate	Min.: 0 kg/h, Max.: 13107 kg/h	-	-
Catalyst Temperature B1S1	Front catalyst temperature	Min.: -40°C (-40°F), Max.: 6513.5°C (11756.3°F)	-	This is the temperature of the front catalyst estimated by the ECM. This item is included in the conditions used to detect catalyst deterioration (DTC P042000), etc., and should therefore be used as a reference when recreating malfunction conditions.
Catalyst Temperature B1S2	Rear catalyst temperature	Min.: -40°C (-40°F), Max.: 6513.5°C (11756.3°F)	-	This is the temperature of the rear catalyst estimated by the ECM.

Check Mode (Check Mode)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Misfire Test Result	Check mode result for misfire monitor	Compl or Incmpl	-	-
A/F (O2) Sensor B1S2 Test Results	Check mode result for heated oxygen sensor	Compl or Incmpl	-	-
A/F (O2) Sensor B1S1 Test Results	Check mode result for air fuel ratio sensor	Compl or Incmpl	-	-

Test Result (Monitor Status)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Complete Parts Monitor	Comprehensive component monitor	Not Avl or Avail	-	*
Complete Parts Monitor Result	Comprehensive component monitor	Compl or Incmpl	-	*
Ignition Monitor	Ignition monitor	Spark Ignition or Compression Ignition	-	-
Fuel System Monitor	Fuel system monitor	Not Avl or Avail	-	*
Fuel System Monitor Result	Fuel system monitor	Compl or Incmpl	-	*
Misfire Monitor	Misfire monitor	Not Avl or Avail	-	*
Misfire Monitor Result	Misfire monitor	Compl or Incmpl	-	*
EGR/VVT Monitor	EGR/VVT monitor	Not Avl or Avail	-	*
EGR/VVT Monitor Result	EGR/VVT monitor	Compl or Incmpl	-	*
A/F (O2) Sensor Heater Monitor	A/F (O2) sensor heater monitor	Not Avl or Avail	-	*
A/F (O2) Sensor Heater Monitor Result	A/F (O2) sensor heater monitor	Compl or Incmpl	-	*
A/F (O2) Sensor Monitor	A/F (O2) sensor monitor	Not Avl or Avail	-	*
A/F (O2) Sensor Monitor Result	A/F (O2) sensor monitor	Compl or Incmpl	-	*
Secondary Air Injection System Monitor	Secondary air injection system monitor	Not Avl or Avail	-	*
Secondary Air Injection System Monitor Result	Secondary air injection system monitor	Compl or Incmpl	-	*
EVAP Monitor	EVAP monitor	Not Avl or Avail	-	*
EVAP Monitor Result	EVAP monitor	Compl or Incmpl	-	*
Heated Catalyst Monitor	Heated catalyst monitor	Not Avl or Avail	-	*
Heated Catalyst Monitor Result	Heated catalyst monitor	Compl or Incmpl	-	*
Catalyst Monitor	Catalyst monitor	Not Avl or Avail	-	*
Catalyst Monitor Result	Catalyst monitor	Compl or Incmpl	-	*

Avail: The monitor is available on this Toyota Prius vehicle.

Not Avl: The monitor is not available on this vehicle.

Incmpl / Compl: The item changes from Incmpl to Compl if the monitor was completed at least once at some time in the past. This item does not change when the ignition switch is turned off. However, the item changes back to Incmpl when DTCs are cleared or cable is disconnected from the negative (-) auxiliary battery terminal.

Various Toyota Prius Vehicle Conditions 2 (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
TC Terminal	TC terminal status	ON or OFF	-	Active Test [Activate the TC Terminal] support data.
MIL	MIL status	ON or OFF	OFF	-
MIL ON Run Distance	Distance driven with MIL on	Min.: 0 Km (0 mile), Max.: 65535 Km (40723 mile)	-	This is the distance driven since the MIL was illuminated.
Running Time from MIL ON	Running time from MIL on	Min.: 0 min, Max.: 65535 min	Running time after MIL turned on	-
Time after DTC Cleared	Time after DTCs cleared	Min.: 0 min, Max.: 65535 min	Time after DTCs cleared	-
Distance from DTC Cleared	Distance driven after DTCs cleared	Min.: 0 km (0 mile), Max.: 65535 km (40723 mile)	Distance driven after DTCs cleared	This is the distance driven since DTCs were cleared (or since the Toyota Prius vehicle left the factory).
Warmup Cycle Cleared DTC	Warmup cycles after DTCs cleared	Min.: 0, Max.: 255	-	This is the number of warmup cycles after the DTCs were cleared.
Distance Traveled from Last Battery Cable Disconnect	Distance driven after auxiliary battery cable disconnected	Min.: 0 Km (0 mile), Max.: 65535 Km (40723 mile)	Total distance Toyota Prius vehicle driven after auxiliary battery cable disconnected	-
IG OFF Elapsed Time	Time after ignition switch off	Min.: 0 min, Max.: 655350 min	Cumulative time after ignition switch off	-
Soak IC Current Timer Value	Length of most recent soak timer operation	Min.: 0 sec, Max.: 614390.625 sec	-	This item displays the length of time the soak timer operated from when the ignition switch was last turned off until it was turned ON.
OBD Requirements	OBD requirement	-	EOBD (Euro OBD)	-
Number of Emission DTC	Emissions-related DTCs	Min.: 0, Max.: 127	-	This is the number of emissions-related DTCs stored.
Toyota Prius Vehicle Speed for PDTC	Displays the vehicle speed for universal trip	Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	-	-
Start Status for PDTC	Displays whether the ignition switch is ON for universal trip	Min.: 0, Max.: 255	-	-
Accelerator Pedal Idle Status for PDTC	Displays whether the accelerator pedal is released for universal trip	Min.: 0, Max.: 255	-	-

Misfire (Ptrl Misfire)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ignition Trigger Count	Ignition counter	Min.: 0, Max.: 65535	0 to 400	This is the cumulative number of ignitions. This counter is increased by one for each ignition (this stops when misfire monitoring stops). This value is cleared every 200 revolutions. The misfire rate for each cylinder is calculated by dividing the misfire count for each cylinder by the value of this item. The misfire rate for each cylinder = Misfire Count Cylinder #1 to #4 / Ignition Trigger Count HINT: For 4-cylinder engines, the values range from 0 to 400. For 6-cylinder engines, the values range from 0 to 600. For 8-cylinder engines, the values range from 0 to 800.
Misfire Count Cylinder #1	Misfire count of No. 1 cylinder	Min.: 0, Max.: 255	0	This is the misfire count for No. 1 cylinder. This counter is increased by one for each misfire and is cleared every 200 revolutions. Check this item to help determine the malfunctioning cylinder.
Misfire Count Cylinder #2	Misfire count of No. 2 cylinder	Min.: 0, Max.: 255	0	This is the misfire count for No. 2 cylinder. This counter is increased by one for each misfire and is cleared every 200 revolutions. Check this item to help determine the malfunctioning cylinder.
Misfire Count Cylinder #3	Misfire count of No. 3 cylinder	Min.: 0, Max.: 255	0	This is the misfire count for No. 3 cylinder. This counter is increased by one for each misfire and is cleared every 200 revolutions. Check this item to help determine the malfunctioning cylinder.
Misfire Count Cylinder #4	Misfire count of No. 4 cylinder	Min.: 0, Max.: 255	0	This is the misfire count for No. 4 cylinder. This counter is increased by one for each misfire and is cleared every 200 revolutions. Check this item to help determine the malfunctioning cylinder.
All Cylinders Misfire Count	Misfire count of all cylinders	Min.: 0, Max.: 255	0	This is the total misfire count of all cylinders. This counter is increased by one for each misfire, has a maximum value of 255 and is cleared every 1000 revolutions.
Misfire RPM	Engine speed for first misfire range	Min.: 0 rpm, Max.: 6375 rpm	0 rpm: 0 misfires	This is the average engine speed recorded when misfiring occurs. The value of this item is closer to the actual conditions of the Toyota Prius vehicle at the time misfire occurred than the values of engine speed and engine load stored in the freeze frame data. When reproducing malfunction conditions, use this value as a reference.
Misfire Load	Engine load for first misfire range	Min.: 0%., Max.: 510%	0%: 0 misfires	This is the average engine load recorded when misfiring occurs. The value of this item is closer to the actual conditions of the Toyota Prius vehicle at the time misfire occurred than the values of Engine Speed and Engine Load stored in the freeze frame data. When reproducing malfunction conditions, use this value as a reference.
Misfire Margin	Misfire monitoring	Min.: -128%, Max.: 127%	0 to 127%: Idling with warmed up engine (inspection mode [maintenance mode])	This is the misfire detection margin. Misfire Margin = (Misfire detection threshold - maximum engine speed variation) / misfire detection threshold x 100% When the variation in the engine speed is large and exceeds the misfire detection threshold, the misfire count starts. This item is a measure of how much the engine speed variation can increase with respect to the threshold before the engine is determined to be misfiring. A large value means there is a large margin for the engine speed to vary before the engine is determined to be misfiring. Example: When the engine is determined to be misfiring, Misfire Margin = -128 to 0%.
Catalyst OT Misfire Fuel Cut	Fuel cut to prevent catalyst from overheating during misfire	Not Avl or Avail	Avail: "Fuel cut to prevent catalyst from overheating during misfire" available Not Avl: "Fuel cut to prevent catalyst from overheating during misfire" not available	When a high frequency of misfires is concentrated in a certain cylinder, this function stops fuel injection for that cylinder. For Toyota Prius vehicles which support this function, stop this fuel cut using the Active Test and confirm the misfire counts to determine the malfunctioning cylinder.
Catalyst OT Misfire Fuel Cut History	History of fuel cut to prevent catalyst from overheating during misfire	ON or OFF	OFF	This can be used to tell whether there was a large amount of misfires occurred at a certain cylinder.
Catalyst OT Misfire Fuel Cut Cylinder #1	Fuel cut operation of No. 1 cylinder (if certain level of misfire malfunction is detected)	ON or OFF	OFF	-
Catalyst OT Misfire Fuel Cut Cylinder #2	Fuel cut operation of No. 2 cylinder (if certain level of misfire malfunction is detected)	ON or OFF	OFF	-
Catalyst OT Misfire Fuel Cut Cylinder #3	Fuel cut operation of No. 3 cylinder (if certain level of misfire malfunction is detected)	ON or OFF	OFF	-
Catalyst OT Misfire Fuel Cut Cylinder #4	Fuel cut operation of No. 4 cylinder (if certain level of misfire malfunction is detected)	ON or OFF	OFF	-

Various Toyota Prius Vehicle Conditions 3 (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
IG ON Duration Time	Ignition switch ON duration time	Min.: 0 ms, Max.: 2147483647 ms	-	-
IG OFF Duration Time	Ignition switch off duration time	Min.: 0 ms, Max.: 2147483647 ms	-	The continuous time until the ignition switch is turned ON is displayed.
Engine Start Hesitation	History of hesitation during engine start	ON or OFF	-	This item changes to ON when the engine speed does not reach 500 rpm during cranking.
Low Revolution for Engine Start	History of low engine speed after engine start	ON or OFF	-	This item changes to ON when the engine speed drops to 200 rpm or less within approximately 2 seconds of the engine was starting.
Engine ECU Internal Temperature	ECM internal temperature	Min.: -40°C (-40°F), Max.: 215°C (419°F)	-	-
Engine Cooling Fan	Engine cooling fan operation status	OFF, Low or High	-	-
Electric Water Pump	Electric water pump speed status	Min.: 0 rpm, Max.: 10200 rpm	-	-

Compression (Compression)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Engine Speed Cylinder #1	Engine speed for No. 1 cylinder	Min.: 0 rpm, Max.: 51199 rpm	-	Values for this item are only displayed when the Active Test "Check the Cylinder Compression" is performed. This is the engine speed of No. 1 cylinder measured during fuel-cut with the engine cranking. When there is compression loss, the engine speed of the malfunctioning cylinder increases. HINT: When multiple cylinders have compression loss, the engine speeds for multiple cylinders increase and it is not possible to determine which cylinders have compression loss. At this time, it is necessary to actually perform a compression measurement.
Engine Speed Cylinder #2	Engine speed for No. 2 cylinder	Min.: 0 rpm, Max.: 51199 rpm	-	Values for this item are only displayed when the Active Test "Check the Cylinder Compression" is performed. This is the engine speed of No. 2 cylinder measured during fuel-cut with the engine cranking. When there is compression loss, the engine speed of the malfunctioning cylinder increases. HINT: When multiple cylinders have compression loss, the engine speeds for multiple cylinders increase and it is not possible to determine which cylinders have compression loss. At this time, it is necessary to actually perform a compression measurement.
Engine Speed Cylinder #3	Engine speed for No. 3 cylinder	Min.: 0 rpm, Max.: 51199 rpm	-	Values for this item are only displayed when the Active Test "Check the Cylinder Compression" is performed. This is the engine speed of No. 3 cylinder measured during fuel-cut with the engine cranking. When there is compression loss, the engine speed of the malfunctioning cylinder increases. HINT: When multiple cylinders have compression loss, the engine speeds for multiple cylinders increase and it is not possible to determine which cylinders have compression loss. At this time, it is necessary to actually perform a compression measurement.
Engine Speed Cylinder #4	Engine speed for No. 4 cylinder	Min.: 0 rpm, Max.: 51199 rpm	-	Values for this item are only displayed when the Active Test "Check the Cylinder Compression" is performed. This is the engine speed of No. 4 cylinder measured during fuel-cut with the engine cranking. When there is compression loss, the engine speed of the malfunctioning cylinder increases. HINT: When multiple cylinders have compression loss, the engine speeds for multiple cylinders increase and it is not possible to determine which cylinders have compression loss. At this time, it is necessary to actually perform a compression measurement.
Average Engine Speed of All Cylinder	Average engine speed for all cylinders	Min.: 0 rpm, Max.: 51199 rpm	-	Values for this item are only displayed when the Active Test "Check the Cylinder Compression" is performed.

Various Toyota Prius Vehicle Conditions 4 (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Requested Engine Torque	Requested engine power	Min.: 0 kW, Max.: 16383.75 kW	0 to 72 kW	-
HV Target Engine Speed	HV target engine speed	Min.: 0 rpm, Max.: 6375 rpm	0 to 5200 rpm	-
Actual Engine Torque	Actual engine torque	Min.: -32768 Nm, Max.: 32767 Nm	0 Nm: Idling (inspection mode [maintenance mode], not charge control)	-
Actual Engine Percent Torque	Actual engine percent torque	Min.: -125%, Max.: 130%	4%: Idling (A/C off, engine warmed up, inspection mode [maintenance mode], not charge control)	-
Engine Reference Torque (Fixed Value)	Engine reference torque (fixed value)	Min.: 0 Nm, Max.: 65535 Nm	149 Nm: Idling (A/C off, engine warmed up, inspection mode [maintenance mode], not charge control)	-
Engine Friction Percent Torque	Engine friction percent torque	Min.: -125%, Max.: 130%	3%: Idling (A/C off, engine warmed up, inspection mode [maintenance mode], not charge control)	-
Engine Driving Time	Engine driving time	Min.: 0 sec, Max.: 255 sec	0 to 255 sec	-
Request Engine Run Time	Request engine run time	Min.: 0 sec, Max.: 25.5 sec	0 to 25.5 sec	-
Judge Time Engine Ignition	Judgment time for complete explosion of ignition	Min.: 0 sec, Max.: 25.5 sec	0 to 25.5 sec	-
Judge Time Engine Output	Judgment time for time until engine output	Min.: 0 sec, Max.: 25.5 sec	0 to 25.5 sec	-
Fuel Level	Fuel level	Empty or Not Emp	Not Emp	-
ISC Learning Value	ISC learning value	Min.: -1024 Nm, Max.: 1023.96 Nm	-5 to 10 Nm: Idling with warmed up engine (inspection mode [maintenance mode])	-
ISC Learning	ISC learning	Compl or Incmpl	Compl: ISC learned value complete Incmpl: ISC learned value incomplete	-
F/C for Engine Stop Req	Fuel cut for engine stop request	ON or OFF	ON → OFF: Engine stopped → Engine start	-
Engine Independent	Engine independent operation	Not Opr or Operate	Operate: Idling with warmed up engine (inspection mode [maintenance mode], not charge control) Not Opr: Idling with warmed up engine (inspection mode [maintenance mode]), accelerator pedal depressed	"Not Opr" is displayed during charge control.
Racing Operation	Racing operation	Not Opr or Operate	Operate: Idling with warmed up engine (inspection mode [maintenance mode]), accelerator pedal depressed Not Opr: Idling with warmed up engine (inspection mode [maintenance mode], not charge control)	-
Request Warm-up	Request engine warm up	Not Req or Request	-	-
Engine Independent Control	Engine independent control operation	Not Opr or Operate	-	-
Electric Water Pump Target Speed	Engine water pump assembly target speed	Min.: 0 rpm, Max.: 6375 rpm	-	Target motor speed of the engine water pump.
Electric Water Pump Speed	Engine water pump assembly speed	Min.: 0 rpm, Max.: 6375 rpm	-	Actual motor speed of the engine water pump.

Various Toyota Prius Vehicle Conditions 5 (All Data)

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
All Universal Condition History	All universal condition history	Min.: 0, Max.: 255	-	-
Universal Condition 1 Judgment History	Universal condition 1 judgment history	Min.: 0, Max.: 255	-	-
Total Universal Condition 1 Judgment Time	Total universal condition 1 judgment time	Min.: -2147483 ms, Max.: 2147418 ms	-	-
Universal Condition 2 Judgment History	Universal condition 2 judgment history	Min.: 0, Max.: 255	-	-
Total Universal Condition 2 Judgment Time	Total universal condition 2 judgment time	Min.: -2147483 ms, Max.: 2147418 ms	-	-
Universal Condition 3 Judgment History	Universal condition 3 judgment history	Min.: 0, Max.: 255	-	-
Total Universal Condition 3 Judgment Time	Total universal condition 3 judgment time	Min.: -2147483 ms, Max.: 2147418 ms	-	-

ACTIVE TEST

HINT:

Using the GTS to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

(d) Turn the ignition switch off.

(e) Turn the ignition switch ON.

(f) Enter the following menus: Powertrain / Engine / Active Test.

(g) According to the display on the GTS, perform the Active Test.

Powertrain > Engine > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Control the Injection Volume	Control the injection volume	Between -12.5% and 24.8%	All fuel injector assemblies are tested at the same time. Injection volume can be changed in fine gradations within the control range. This Active Test enables the checking and graphing of the air fuel ratio sensor and heated oxygen sensor voltage outputs. To perform this Active Test, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2. While performing the Active Test, air fuel ratio feedback control and feedback learning are stopped. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode).
Control the Injection Volume for A/F Sensor	Change injection volume	-12.5%/0%/12.5%	All fuel injector assemblies are tested at the same time. This Active Test enables the checking and graphing of the air fuel ratio sensor and heated oxygen sensor voltage outputs. To perform this Active Test, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2. While performing the Active Test, air fuel ratio feedback control and feedback learning are stopped. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode). See waveform *3.
Activate the EVAP Purge VSV	Activate purge VSV control	ON/OFF	Confirm that the Toyota Prius vehicle is stopped. The purge VSV is opened with approximately 50% duty ratio. See waveform *5.
Activate the Circuit Relay	Activate fuel pump	ON/OFF	Perform this test when the following conditions are met: Ignition switch ON. Engine is stopped. Park (P) has been selected.
Activate the TC Terminal	Turn on and off TC and TE1 (CG) connection	ON/OFF	Confirm that the Toyota Prius vehicle is stopped. ON: TC and TE1 (CG) are connected. OFF: TC and TE1 (CG) are disconnected.
Prohibit the Idle Fuel Cut	Prohibit idling fuel cut control	Start/Stop	Perform this test when the following conditions are met: Ignition switch ON. Park (P) has been selected.
Prohibit the Catalyst OT Misfire Prevent Fuel Cut	Prohibit catalyst overheat protection fuel cut	Start/Stop Start: Fuel cut prohibited	Perform this test when the Toyota Prius vehicle is stopped and the engine speed is 3000 rpm or less.
Control the ETCS Open/Close Slow Speed	Throttle actuator	Close/Open Start/Stop Open: Throttle valve opens slowly	Perform this test when the following conditions are met: Ignition switch ON. Engine is stopped. Accelerator pedal is fully depressed (accelerator pedal position: 58 degrees or more). Park (P) has been selected.
Control the ETCS Open/Close Fast Speed	Throttle actuator	Close/Open Start/Stop Open: Throttle valve opens quickly	Same as above. See waveform *4.
Control the Intake VVT OCV Duty Ratio Bank 1	Control camshaft timing oil control valve assembly	-100 to 100% (This value added to present camshaft timing oil control valve assembly control duty) 100%: Maximum advance -100%: Maximum retard	Engine stalls or idles roughly when the camshaft timing oil control valve assembly is set to 100%. Perform this test when the following conditions are met: Engine is idling. DTCs related to the VVT system may be stored due to Active Test operation, but this does not indicate a malfunction. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode). See waveform *7.
Control the EGR Step Position	Control EGR valve assembly	From 0 to 110 step	The EGR valve is fully closed at step position 0, and fully open at step position 110. The amount of EGR gas flowing into the intake manifold varies in accordance with the EGR valve opening angle. Perform this test when the following conditions are met: Engine is running. Park (P) has been selected. Do not leave the EGR valve open for 10 seconds or more while performing the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more while performing the Active Test. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode). See waveform *6.
Control the Select Cylinder Fuel Cut	Selected cylinder (cylinder #1 to #4) injector fuel cut	#1/#2/#3/#4 Start/Stop	Perform this test when the following conditions are met: Engine is idling. Park (P) has been selected. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode). *1
Control the All Cylinders Fuel Cut	Fuel cut for all cylinders	Start/Stop	Perform this test when the following conditions are met: Engine is idling. Park (P) has been selected. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode).
Check the Cylinder Compression	Check the cylinder compression pressure	Start/Stop	Fuel injection and ignition stop of all cylinders. This Active Test should be performed with the engine in Inspection Mode (Maintenance Mode). *2
Control the Engine Cooling Fan	Control electric cooling fan motor	OFF/Low/High	Perform this test when Toyota Prius vehicle is stopped.
Activate the Electric Water Pump	Engine water pump assembly speed control	0 rpm/3000 rpm	Perform this test when engine coolant temperature less than 100°C (212°F).

*1: Control the Select Cylinder Fuel Cut

NOTICE:

If the display of the Data List item Catalyst OT Misfire Fuel Cut item is Not Avl, perform this Active Test with the Toyota Prius vehicle stopped and the engine idling.
If the display of the Data List item Catalyst OT Misfire Fuel Cut item is Avail, perform this Active Test as described below.
1. Stop the engine, turn the ignition switch ON.
2. Enter the Control the Select Cylinder Fuel Cut.
3. Select the cylinder for fuel cut (No. 1 to No. 4 cylinder) and turn the Active Test ON.
4. Start the engine.

*2: Check the Cylinder Compression

NOTICE:

Use a fully-charged HV battery.

HINT:

While the Check the Cylinder Compression Active Test is being performed, if the speed of one cylinder is more than the other cylinders, it can be determined that the compression pressure of that cylinder is lower than the other cylinders.

Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up.
Turn the ignition switch off.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here

HINT:

Do not start the engine.
Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression.
HINT:

To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.
Push the snapshot button to turn the snapshot function on.
HINT:

Using the snapshot function, data can be recorded while performing the Active Test.
While the engine is not running, press the Active Test button to change Check the Cylinder Compression to "Start".
HINT:

After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.
Crank the engine.
HINT:

Continue to crank the engine until the values change from the default value (51199 rpm).
Monitor the engine speed (Engine Speed Cylinder #1 to #4) displayed on the GTS.
NOTICE:
- If the Check the Cylinder Compression Active Test needs to be performed after it is changed to "Start" and performed once, press the Exit button to return to the Active Test menu screen. Then perform the Check the Cylinder Compression Active Test again.
- As soon as the measurements are obtained, stop the Active Test.
HINT:
- At first, the GTS display will show each cylinder's engine speed measurement to be extremely high. After the engine has started, each cylinder's engine speed measurement will change to the actual engine speed.
- If the cylinder engine speed values (Engine Speed Cylinder #1 to #4) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.
Stop the engine and change the Active Test "Check the Cylinder Compression" to "Stop" after the engine stops.
NOTICE:

After performing the Active Test, make sure to check and clear the DTCs.
Push the snapshot button to turn the snapshot function off.
Select "Stored Data" on the GTS screen, select the recorded data and display the data as a graph.
HINT:

If the data is not displayed as a graph, the change of the values cannot be observed.
Check the change in engine speed values.

Reference Waveforms for Active Test

*3: Control the Injection Volume for A/F Sensor (Engine warmed up and idling, inspection mode [maintenance mode], not charge control)

GTS Display	Measurement Item/Operation	Normal Condition
Control the Injection Volume for A/F Sensor	-	▲A	▲B
	Active Test operation	-12.5%	12.5%
	A/F (O2) Sensor Voltage B1S1	3.724 V	2.397 V
	O2 Sensor Voltage B1S2	0.055 V	0.955 V

HINT:

While performing the Active Test, air fuel ratio feedback control and feedback learning are stopped.
Usually, the value of A/F (O2) Sensor Voltage B1S1 drops below 3.1 V when the control value for Control the Injection Volume for A/F Sensor is changed to 12.5%.
Usually, the value of A/F (O2) Sensor Voltage B1S1 changes to 3.4 V or higher when the control value for Control the Injection Volume for A/F Sensor is changed to -12.5%.
Usually, the value of O2 Sensor Voltage B1S2 changes to 0.55 V or higher when the control value for Control the Injection Volume for A/F Sensor is changed to 12.5%.
Usually, the value of O2 Sensor Voltage B1S2 drops below 0.4 V when the control value for Control the Injection Volume for A/F Sensor is changed to -12.5%.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

*4: Control the ETCS Open/Close Fast Speed [Active Test for electrical throttle control system] (Ignition switch ON, Accelerator pedal fully depressed)

GTS Display	Measurement Item/Operation	Normal Condition
Control the ETCS Open/Close Fast Speed	-	▲A	▲B
	Active Test operation	Open	Close
	Throttle Position Sensor No.1 Voltage	2.597 V	0.742 V
	Throttle Motor Duty Ratio (Open)	13.0%	0.0%
	Throttle Motor Duty Ratio (Close)	0.0%	13.0%

HINT:

If any DTCs related to the Electronic Throttle Control System (ETCS) are stored, this Active Test cannot be performed.

*5: Activate the EVAP Purge VSV (Engine warmed up and idling, inspection mode [maintenance mode], not charge control)

GTS Display	Measurement Item/Operation	Normal Condition
Activate the EVAP Purge VSV	-	▲A	▲B
	Active Test operation	ON	OFF
	EVAP (Purge) VSV	49.8%	0.0%
	Injector Cylinder #1 (Port)	1859 μs	1894 μs
	A/F (O2) Sensor Voltage B1S1	3.296 V	3.301 V

HINT:

The graphs and values above are for reference only because the fuel injection volume (compensation volume) varies depending on the HC density of the purge air from the canister.
Even when the Active Test is performed (the purge VSV is opened approximately 50%), the ECM performs air fuel ratio feedback to maintain the air fuel ratio at the stoichiometric ratio. Therefore, by observing the change in the Data List item "Injector Cylinder #1 (Port)", it is possible to determine whether the purge VSV is actually open.

*6: Control the EGR Step Position (Engine warmed up and idling, inspection mode [maintenance mode], not charge control)

GTS Display	Measurement Item/Operation	Normal Condition
Control the EGR Step Position	-	▲A	▲B	▲C	▲D
	EGR Step Position	0 step	10 step	20 step	30 step
	Intake Manifold Absolute Pressure	28 kPa (4.06 psi)	28 kPa (4.06 psi)	67 kPa (9.72 psi)	88 kPa (12.76 psi)

NOTICE:

Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
Do not leave the EGR valve open for 10 seconds or more while performing Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

HINT:

When the value of Control the EGR Step Position is "0 step", the value of Intake Manifold Absolute Pressure should be between 20 and 40 kPa (2.9 to 5.8 psi).
When the EGR system is normal and the value of Control the EGR Step Position is changed from "0 step" to "30 step", the value of Intake Manifold Absolute Pressure will increase to a value at least 10 kPa (1.45 psi) higher than the value of Intake Manifold Absolute Pressure when the value of Control the EGR Step Position was "0 step".
If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).

*7: Control the Intake VVT OCV Duty Ratio Bank 1 (Idling, inspection mode [maintenance mode], not charge control)

GTS Display	Measurement Item/Operation	Normal Condition
Control the Intake VVT OCV Duty Ratio Bank 1	-	▲A	▲B
	Active Test operation*	30%	-30%
	Intake VVT Change Angle Bank 1	62.5 DegFR	0.0 DegFR
	Intake VVT OCV Control Duty Ratio Bank 1	65.4%	25.7%
	Intake VVT Hold Learn Value Bank 1	50.0%	50.0%

HINT:

*: Change the control value for Control the Intake VVT OCV Duty Ratio Bank 1 to 30% or -30%.
Test not possible with park (P) selected during charge control. Select neutral (N) to perform test.

Vehicle Control History

VEHICLE CONTROL HISTORY

DESCRIPTION (SFI SYSTEM)

Vehicle Control History is a function that captures and stores ECU data when triggered by specific vehicle behavior.
If the customer states that the engine stalled or will not start, it may be possible to diagnose the cause of the malfunction by checking the Toyota Prius vehicle history information and freeze frame data.
The number of possible stored Freeze Frame Data sets, whether multi Freeze Frame Data is available, the number of freeze frame points, Freeze Frame Data items, the ECU internal range, etc., is different depending on the stored group.
The stored data items for Toyota Prius Vehicle Control History Freeze Frame Data are different depending on the stored group. When the value of a data item does not change across all points, only the value of the detection point will be displayed. The contents of the Freeze Frame Data is almost the same as that of the Data List.
Click here

PRECAUTIONS (SFI SYSTEM)

As Toyota Prius Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save Vehicle Control History before performing any inspections.
As Vehicle Control History may be stored when performing an Active Test, learning, etc., make sure to clear the Vehicle Control History before returning the Toyota Prius vehicle to the customer.

CHECK VEHICLE CONTROL HISTORY (SFI SYSTEM)

HINT:

Vehicle control history (SFI system) is stored when Switch Specification Information learning is incomplete.
Perform Switch Specification Information after replacing the ECM.

(a) Enter the following menus: Powertrain / Engine / Utility / Toyota Prius Vehicle Control History (RoB).

Powertrain > Engine > Utility

Tester Display
Vehicle Control History (RoB)

HINT:

It is also possible to display Toyota Prius Vehicle Control History during the Health Check, if "Store All Data" is selected.

Vehicle Control History Item

Code	Item	Trigger Description	Stored Group	Reference Inspection Procedure	Link
XF01B	ECU Security Key Not Registered	ECU security key not updated	-	-

Toyota Prius Vehicle Control History Freeze Frame Data

CLEAR VEHICLE CONTROL HISTORY (SFI SYSTEM)

(a) Enter the following menus: Powertrain / Engine / Utility / Vehicle Control History (RoB) (Clear).

NOTICE:

By performing this procedure, all stored Toyota Prius Vehicle Control History items will be cleared.

Powertrain > Engine > Utility

Tester Display
Vehicle Control History (RoB)

VEHICLE CONTROL HISTORY (AIRBAG SYSTEM)

HINT:

A part of the control history can be confirmed using the Toyota Prius vehicle control history.

Click here

VEHICLE CONTROL HISTORY (HYBRID CONTROL SYSTEM)

HINT:

A part of the control history can be confirmed using the vehicle control history.

Click here

A Camshaft Position Actuator Bank 1 Circuit Open (P001013)

DESCRIPTION

The Variable Valve Timing (VVT) system consists of the ECM, camshaft timing oil control valve assembly and camshaft timing gear assembly.

The VVT system controls the camshaft timing oil control valve assembly to operate the camshaft timing gear assembly and optimize the intake valve timing according to driving conditions. This control is performed based on the air flow volume, throttle position, engine coolant temperature, etc. Based on signals from each sensor, the ECM controls the position of the camshaft timing control valve assembly to change the relative position of the camshaft, enhance the engine torque and fuel economy and decrease the exhaust gas emissions. Using signals from the camshaft position sensor, the ECM detects the actual valve timing and performs feedback control to optimize the valve timing.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P001013	A Camshaft Position Actuator Bank 1 Circuit Open	Open or short in camshaft timing oil control valve assembly circuit (1 trip detection logic).	Open or short in camshaft timing oil control valve assembly circuit Camshaft timing oil control valve assembly ECM	Comes on	Engine	A	SAE Code: P0010

MONITOR DESCRIPTION

This DTC is designed to detect an open or short in the camshaft timing oil control valve assembly circuit. If the camshaft timing oil control valve assembly duty-cycle is excessively high or low while the ignition switch is ON or the engine is running, the ECM will illuminate the MIL and store this DTC.

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P001013.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTC after recording the freeze frame data and DTC.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	READ OUTPUT DTC (DTC P001013)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

Procedure1

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P001013 is output	B

Post-procedure1

(d) None

CHECK FOR INTERMITTENT PROBLEMS

3.	INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

Click here

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the camshaft timing oil control valve assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C21,C53) Click Connector(C21) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C21-1 ( ) - C53-41 (OC1 )	Always	Below 1 Ω	Ω
C21-2 (-) - C53-40 (OC1-)	Always	Below 1 Ω	Ω
C21-1 ( ) or C53-41 (OC1 ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C21-2 (-) or C53-40 (OC1-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1 (P001100,P001200)

DESCRIPTION

Refer to DTC P001013.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P001100	Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1	Intake valve timing is stuck at a certain value when in the advance range (1 trip detection logic).	Valve timing Camshaft timing oil control valve assembly Camshaft timing gear assembly Oil control valve filter ECM	Comes on	Engine	B	SAE Code: P0011
P001200	Camshaft Position "A" - Timing Over-Retarded Bank 1	Intake valve timing is stuck at a certain value when in the retard range (2 trip detection logic).	Valve timing Camshaft timing oil control valve assembly Camshaft timing gear assembly Oil control valve filter ECM	Comes on	Engine	B	SAE Code: P0012

MONITOR DESCRIPTION

The ECM optimizes the intake valve timing using the Variable Valve Timing (VVT) system to control the intake camshaft. The VVT system includes the ECM, camshaft timing oil control valve assembly and VVT controller (camshaft timing gear assembly). The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve assembly. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake camshaft.

If the difference between the target and actual intake valve timing is large, and changes in the actual intake valve timing are small, the ECM interprets this as a VVT controller stuck malfunction and stores a DTC.

Example:
A DTC is stored when the following conditions are met:
1. It takes 5 seconds or more to change the valve timing by 5°CA.
2. After the above condition is met, the camshaft timing oil control valve assembly is forcibly activated for 9.5 seconds or more.

DTC P001100 (Advanced Camshaft Timing) is subject to 1 trip detection logic.

DTC P001200 (Retarded Camshaft Timing) is subject to 2 trip detection logic.

These DTCs indicate that the VVT controller cannot operate properly due to a camshaft timing oil control valve assembly malfunction or the presence of foreign matter in the camshaft timing oil control valve assembly.

MONITOR STRATEGY

Required Sensors/Components (Main)

Camshaft timing oil control valve assembly

Camshaft timing gear assembly

Required Sensors/Components (Related)

Crankshaft position sensor

Camshaft position sensor

Engine coolant temperature sensor

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
HINT:
- If P001100 was output:
  Clear the DTC without using the GTS.
- If P001200 was output:
  Clear the DTC using the GTS.
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [B].
With the engine running, accelerate the Toyota Prius vehicle to 75 km/h (46 mph) or more by depressing the accelerator pedal for 10 seconds or more [C].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Idle the engine for 100 seconds or more [D].
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P001100 or P001200.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [F] through [H].
With the engine running, accelerate the Toyota Prius vehicle to 75 km/h (46 mph) or more by depressing the accelerator pedal for 10 seconds or more [F].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Idle the engine for 100 seconds or more [G].
Enter the following menus: Powertrain / Engine / Trouble Codes [H].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTCs are not output, perform the following procedure.
Check the DTC judgment result again.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

Refer to DTC P001013.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

DTC P001100 or P001200 may be stored when foreign matter in the engine oil is caught in parts of the system. The DTC will remain stored even if the system returns to normal after a short time. The foreign matter may then be captured by the oil filter.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P001100 OR P001200)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P001100 or P001200 and other DTCs are output	A
P001100 or P001200 is output	B

HINT:

If any DTCs other than P001100 or P001200 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INTAKE VVT OCV DUTY RATIO BANK 1)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

Procedure1

Powertrain > Engine > Active Test

Tester Display
Control the Intake VVT OCV Duty Ratio Bank 1

OK:

GTS Operation	Specified Condition
0%	Normal engine speed
100%	Engine idles roughly or stalls

HINT:

Test not possible with park (P) selected during charge control. Select neutral (N) to perform test.
If DTCs are stored after the Active Test, clear the DTCs.

Post-procedure1

(d) None

GO TO STEP 5

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

HINT:

If P001100 was output:
Clear the DTC without using the GTS.
If P001200 was output:
Clear the DTC using the GTS.

Post-procedure1

4.	CHECK WHETHER DTC OUTPUT RECURS (DTC P001100 OR P001200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P001100 or P001200 is output	B

HINT:

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

GO TO STEP 5

5.	INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

Click here

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

6.	CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

Pre-procedure1

(a) Remove the cylinder head cover sub-assembly.

*a	39.5°	*b	Timing Mark
*c	"0" Timing Mark	*d	Groove

(b) Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain or belt cover sub-assembly.

Procedure1

(c) Check that the timing marks of the camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK:

Timing marks on camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

Post-procedure1

(d) None

GO TO STEP 9

7.	INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

Click here

REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

8.	INSPECT OIL CONTROL VALVE FILTER

Pre-procedure1

(a) Remove the oil control valve filter.

HINT:

Click here

*1	Oil Control Valve Filter

Procedure1

(b) Check that the filter is not clogged.

OK:

Filter is not clogged.

Post-procedure1

GO TO STEP 10

REPLACE OIL CONTROL VALVE FILTER

9.	CHECK ENGINE MECHANICAL SYSTEM

(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine mechanical system.

Click here

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

10.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

HINT:

If P001100 was output:
Clear the DTC without using the GTS.
If P001200 was output:
Clear the DTC using the GTS.

Post-procedure1

11.	CHECK WHETHER DTC OUTPUT RECURS (DTC P001100 OR P001200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P001100 or P001200 is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A (P001600)

DESCRIPTION

Refer to DTC P001013.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P001600	Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A	Deviation in the crankshaft position sensor signal and camshaft position sensor signal (2 trip detection logic).	Valve timing Camshaft timing oil control valve assembly Camshaft timing gear assembly Oil control valve filter ECM	Comes on / Does not come on	Engine	B	SAE Code: P0016

MONITOR DESCRIPTION

To monitor the correlation of the intake camshaft position and crankshaft position, the ECM checks the VVT learned value while the engine is idling. The VVT learned value is calibrated based on the camshaft position and crankshaft position. The intake valve timing is set to the most retarded angle while the engine is idling. If the VVT learned value is out of the specified range in consecutive driving cycles, the ECM stores this DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)

Camshaft timing gear assembly

Required Sensors/Components (Related)

Camshaft position sensor

Crankshaft position sensor

Frequency of Operation

Continuous

TYPICAL ENABLING CONDITIONS

Engine speed

900 to 1100 rpm

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [B].
Idle the engine for 5 minutes or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P001600.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [E] through [G].
With the engine running, drive the Toyota Prius vehicle at 60 km/h (37 mph) for 2 to 3 minutes [E].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Idle the engine for 5 minutes or more [F].
Enter the following menus: Powertrain / Engine / Trouble Codes [G].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

The monitor for this DTC detects when the timing chain is shifted by one tooth or more.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P001600)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P001600 and other DTCs are output	A
P001600 is output	B

HINT:

If any DTCs other than P001600 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INTAKE VVT OCV DUTY RATIO BANK 1)

Pre-procedure1

HINT:

If the VVT system can be operated through the Active Test, it can be assumed that the VVT system is operating normally.

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

Procedure1

Powertrain > Engine > Active Test

Active Test Display
Control the Intake VVT OCV Duty Ratio Bank 1

Data List Display
Intake VVT Change Angle Bank 1

OK:

Displacement angle changes.

HINT:

Test not possible with park (P) selected during charge control. Select neutral (N) to perform test.
If DTCs are stored after the Active Test, clear the DTCs.

Post-procedure1

(d) None

GO TO STEP 4

3.	CHECK ENGINE MECHANICAL SYSTEM

(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine mechanical system.

Click here

GO TO STEP 7

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

4.	INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

Click here

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

5.	INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

Click here

REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

6.	INSPECT OIL CONTROL VALVE FILTER

Pre-procedure1

(a) Remove the oil control valve filter.

HINT:

Click here

*1	Oil Control Valve Filter

Procedure1

(b) Check that the filter is not clogged.

OK:

Filter is not clogged.

Post-procedure1

REPLACE OIL CONTROL VALVE FILTER

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

8.	CHECK WHETHER DTC OUTPUT RECURS (DTC P001600)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the pending DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P001600 is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P101A9E)

DESCRIPTION

The air fuel ratio sensor generates voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor is a planar type and integrated with a heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), current flows to the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are a narrow type. The heat generated by the heater is conducted to the solid electrolyte through alumina, therefore sensor activation is accelerated.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel ratio.

*: Value changes inside the ECM. Since the air fuel ratio sensor is a current output element, the current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.

HINT:

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
The ECM has a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor heater circuit uses a relay on the B side of the circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P003012	HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery	The air fuel ratio sensor heater current is more than the specified value while the heater is operating (1 trip detection logic).	Short in air fuel ratio sensor (sensor 1) heater circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P0032
P003013	HO2S Heater Control Bank 1 Sensor 1 Circuit Open	The air fuel ratio sensor heater current is less than the specified value while the heater is operating (1 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) heater circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P0031
P101A9E	A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On	The air fuel ratio sensor heater voltage level is low while the heater is not operating (1 trip detection logic).	Short in air fuel ratio sensor (sensor 1) heater circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P101D

MONITOR DESCRIPTION

The ECM uses information from the air fuel ratio sensor to regulate the air fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gases.

The air fuel ratio sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum-coated zirconia and includes an integrated heating element.

The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.

The air fuel ratio sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate a useful current signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor becomes inaccurate. As a result, the ECM is unable to regulate the air fuel ratio properly.

When the current in the air fuel ratio sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components	Air fuel ratio sensor (sensor 1) heater
Frequency of Operation	Continuous

TYPICAL ENABLING CONDITIONS

P003012

Output duty cycle

7% or higher

P003013

Output duty cycle

7% or higher

P101A9E

Output duty cycle

Less than 75%

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and idle it for 5 minutes or more [B].
With the Toyota Prius vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 rpm for 1 minute [C].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform steps [C] and [D] after charge control has completed.
Idle the engine for 5 minutes or more [D].
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P003012, P003013 or P101A9E.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [E] again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

The operation of the air fuel ratio sensor heater can be checked by referring to the Data List item A/F (O2) Sensor Heater Duty Ratio B1S1.
Click here
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
Change the fuel injection volume using the Active Test "Control the Injection Volume for A/F Sensor" and monitor the air fuel ratio sensor output voltage (Click here ). If the air fuel ratio sensor output voltage does not change (almost no reaction) while performing the Active Test, the air fuel ratio sensor may be malfunctioning.

PROCEDURE

1.	INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Click here

REPLACE AIR FUEL RATIO SENSOR

2.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

Pre-procedure1

(a) Disconnect the air fuel ratio sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C45) Click Connector(C45)

Tester Connection	Condition	Specified Condition	Result
C45-2 ( B) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

GO TO STEP 6

3.	CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

Pre-procedure1

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C45,C53) Click Connector(C45) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C45-1 (HA1A) - C53-28 (HA1A)	Always	Below 1 Ω	Ω
C45-1 (HA1A) or C53-28 (HA1A) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Pre-procedure1

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Procedure1

(b) Turn the ignition switch off and wait for at least 30 seconds.

Post-procedure1

5.	CHECK WHETHER DTC OUTPUT RECURS (DTC P003012, P003013 OR P101A9E)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P003012, P003013 or P101A9E is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

6.	INSPECT EFI-MAIN NO. 2 RELAY

Click here

REPLACE EFI-MAIN NO. 2 RELAY

7.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition	Result
3 (EFI-MAIN NO. 2 relay) - Body ground	Always	11 to 14 V	V

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY)

8.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (EFI-MAIN NO. 2 relay) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - AIR FUEL RATIO SENSOR)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the air fuel ratio sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(C45) Click Connector(C45)

Tester Connection	Condition	Specified Condition	Result
5 (EFI-MAIN NO. 2 relay) - C45-2 ( B)	Always	Below 1 Ω	Ω
5 (EFI-MAIN NO. 2 relay) or C45-2 ( B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery (P003612,P003614,P102A9E)

DESCRIPTION

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC (Three-Way Catalytic Converter) is used. For the most efficient use of the TWC, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel ratio. For the purpose of helping the ECM to deliver accurate air fuel ratio control, a heated oxygen sensor is used.

The heated oxygen sensor is located behind the TWC, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).

When the air fuel ratio becomes lean, the oxygen concentration in the exhaust gas is high. The heated oxygen sensor informs the ECM that the post-TWC air fuel ratio is lean (low voltage, i.e. less than 0.45 V).

Conversely, when the air fuel ratio is richer than the stoichiometric air fuel ratio, the oxygen concentration in the exhaust gas is low. The heated oxygen sensor informs the ECM that the post-TWC air fuel ratio is rich (high voltage, i.e. higher than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air fuel ratio is close to the stoichiometric air fuel ratio.

The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air fuel ratio after the TWC is rich or lean, and adjusts the fuel injection duration accordingly. Thus, if the heated oxygen sensor is working improperly due to an internal malfunction, the ECM is unable to compensate for deviations in the primary air fuel ratio control.

HINT:

When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
The heated oxygen sensor heater circuit uses a relay on the B side of the circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P003612	HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery	The heated oxygen sensor heater current is the specified value or higher while the heater is operating (1 trip detection logic).	Short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	Engine	A	SAE Code: P0038
P003614	HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open	The heated oxygen sensor heater current is the specified value or less while the heater is operating (1 trip detection logic).	Open or short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	Engine	A	SAE Code: P0037
P102A9E	O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On	The heated oxygen sensor heater voltageis the specified value orless while the heater isnot operating (1 trip detection logic).	Short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	Engine	A	SAE Code: P102D

MONITOR DESCRIPTION

The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor.

Heated Oxygen Sensor Heater Range Check and Heater Performance (Stuck ON):

The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions.
If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction of the sensor heater and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components	Heated oxygen sensor (sensor 2) heater
Frequency of Operation	Continuous

TYPICAL ENABLING CONDITIONS

Time after heater on

5 seconds or more

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and idle it for 5 minutes or more [B].
With the Toyota Prius vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 rpm for 1 minute [C].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform steps [C] and [D] after charge control has completed.
Idle the engine for 5 minutes or more [D].
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P003612, P003614 or P102A9E.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [E] again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

The operation of the heated oxygen sensor heater can be checked by referring to the Data List items "O2 Sensor Heater B1S2" and "O2 Sensor Heater Current Value B1S2".
Click here
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
When the value of the Data List item O2 Sensor Heater Current Value B1S2 is not 0 A, the heater is on.
Change the fuel injection volume using the Active Test "Control the Injection Volume for A/F Sensor" and monitor the heated oxygen sensor output voltage (Click here ). If the heated oxygen sensor output voltage does not change (almost no reaction) while performing the Active Test, the heated oxygen sensor may be malfunctioning.

PROCEDURE

1.	INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

Click here

REPLACE HEATED OXYGEN SENSOR

2.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)

Pre-procedure1

(a) Disconnect the heated oxygen sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C48) Click Connector(C48)

Tester Connection	Condition	Specified Condition	Result
C48-2 ( B) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

GO TO STEP 6

3.	CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

Pre-procedure1

(a) Disconnect the heated oxygen sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C48,C53) Click Connector(C48) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C48-1 (HT1B) - C53-56 (HT1B)	Always	Below 1 Ω	Ω
C48-1 (HT1B) or C53-56 (HT1B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Pre-procedure1

(a) None

Post-procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Procedure1

5.	CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003614 OR P102A9E)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the pending DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P003612, P003614 or P102A9E is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

6.	INSPECT EFI-MAIN NO. 2 RELAY

Click here

REPLACE EFI-MAIN NO. 2 RELAY

7.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition	Result
3 (EFI-MAIN NO. 2 relay) - Body ground	Always	11 to 14 V	V

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY)

8.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (EFI-MAIN NO. 2 relay) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - HEATED OXYGEN SENSOR)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the heated oxygen sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(C48) Click Connector(C48)

Tester Connection	Condition	Specified Condition	Result
5 (EFI-MAIN NO. 2 relay) - C48-2 ( B)	Always	Below 1 Ω	Ω
5 (EFI-MAIN NO. 2 relay) or C48-2 ( B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Manifold Absolute Pressure - Barometric Pressure Correlation (P006900)

DESCRIPTION

The manifold absolute pressure sensor installed to the intake manifold detects the intake manifold pressure using a built-in sensor.

An atmospheric pressure sensor is built in the ECM. When the engine is stopped, the value of the manifold absolute pressure sensor and atmospheric pressure sensor will be approximately the same as the atmospheric pressure.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P006900	Manifold Absolute Pressure - Barometric Pressure Correlation	Difference between atmospheric pressure value of the absolute pressure sensor and atmospheric pressure sensor is higher than threshold value (2 trip detection logic).	Manifold absolute pressure sensor ECM	Comes on	Engine	B	SAE Code: P0069

MONITOR DESCRIPTION

Approximately 50 minutes after the ignition switch is turned off, the soak timer is activated and the values of the manifold absolute pressure sensor and atmospheric pressure sensor are compared. If the difference between the values of the manifold absolute pressure sensor and atmospheric pressure sensor is higher than a threshold value in consecutive driving cycles, the ECM will store this DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)

Manifold absolute pressure sensor

ECM

Required Sensors/Components (Related)

Mass air flow meter sub-assembly

Engine coolant temperature sensor

Frequency of Operation

Once per driving cycle

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 55 minutes.
Turn the ignition switch ON.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P006900.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P006900)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P006900 and other DTCs are output	A
P006900 is output	B

HINT:

If any DTCs other than P006900 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	READ VALUE USING GTS (INTAKE MANIFOLD ABSOLUTE PRESSURE)

Pre-procedure1

(a) Turn the ignition switch off and wait for at least 50 minutes.

(b) Turn the ignition switch ON.

HINT:

Standard atmospheric pressure is approximately 101 kPa(abs) [15 psi(abs)].
For every 100 m (328 ft.) increase in altitude, atmospheric pressure drops by approximately 1 kPa (0.1 psi). This varies depending on the weather.

Procedure1

(d) Compare the value of the Data List item Intake Manifold Absolute Pressure with the actual atmospheric pressure.

Powertrain > Engine > Data List

Tester Display
Intake Manifold Absolute Pressure

Result	Proceed to
Approximately the same as the actual atmospheric pressure	A
Not approximately the same as the actual atmospheric pressure	B

Post-procedure1

(e) None

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

3.	READ VALUE USING GTS (ATMOSPHERIC PRESSURE)

Pre-procedure1

(a) Using the following table, determine the normal atmospheric pressure for the current altitude and temperature.

HINT:

Standard atmospheric pressure is approximately 101 kPa(abs) [15 psi(abs)].
For every 100 m (328 ft.) increase in altitude, atmospheric pressure drops by approximately 1 kPa (0.1 psi). This varies depending on the weather.

Procedure1

(b) Compare the value of the Data List item Atmospheric Pressure with the actual atmospheric pressure.

Powertrain > Engine > Data List

Tester Display
Atmospheric Pressure

Result	Proceed to
Approximately the same as the actual atmospheric pressure	A
Not approximately the same as the actual atmospheric pressure	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Mass or Volume Air Flow Sensor "A" Circuit Short to Battery (P010012,P010014)

DESCRIPTION

The mass air flow meter sub-assembly is a sensor that measures the intake air volume using the following built-in components:

By-pass passage (allows some of the intake air to flow past a silicon chip sensor)
Silicon chip sensor (uses a heater control bridge circuit and temperature sensor bridge circuit to detect the difference in the temperature of the intake air that passes the sensors positioned before and after the heater).
Control circuit (converts the difference in temperature into a pulse signal and performs correction)

Intake air flows over the temperature sensor (before heater), the heater, and then the temperature sensor (after heater) on the silicon chip sensor in the by-pass passage. As the intake air is warmed up when it is exposed to the heater, the temperature of the intake air flowing over the temperature sensor (after heater) is higher than that over the temperature sensor (before heater). The difference in temperature of the intake air at each temperature sensor varies depending on the velocity of the intake air that flows over the silicon chip sensor. The temperature sensor bridge circuit detects the difference in temperature and the control circuit converts it into a pulse signal and outputs it to the ECM. When the temperature detected by the temperature sensor (before heater) is higher than that detected by the temperature sensor (after heater), backflow of the intake air is detected.

The ECM calculates the intake air amount based on the pulse signal received from the mass air flow meter sub-assembly, and uses it to determine the fuel injection duration necessary for an optimal air-fuel ratio.

The heater control bridge circuit includes temperature sensors and power transistor, and maintains the heater temperature at a specific temperature.

HINT:

When DTCs are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM calculates the fuel injection duration based on the engine speed and throttle valve angle. Fail-safe mode continues until a pass condition is detected.

*1	Mass Air Flow Meter Sub-assembly	-	-
*a	Upstream Side	*b	Downstream Side
*c	Heater	*d	Temperature Distribution WithoutAirflow
*e	Flow Rate Detection by TemperatureDifferential	*f	Intake Air

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P010012	Mass or Volume Air Flow Sensor "A" Circuit Short to Battery	The mass air flow meter sub-assembly output frequency is higher than 9.8 kHz for 3 seconds or more (1 trip detection logic).	Open or short in mass air flow meter sub-assembly circuit Mass air flow meter sub-assembly ECM	Comes on	Engine	A	SAE Code: P0103
P010014	Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open	The mass air flow meter sub-assembly output frequency is less than 0.1 kHz for 3 seconds or more (1 trip detection logic).	Open or short in mass air flow meter sub-assembly circuit Mass air flow meter sub-assembly ECM	Comes on	Engine	A	SAE Code: P0102

MONITOR DESCRIPTION

If there is a defect or an open or short circuit in the mass air flow meter sub-assembly, the frequency level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter sub-assembly circuit and stores a DTC.

Example:

When the sensor output frequency remains less than 0.1 kHz, or higher than 9.8 kHz for 3 seconds, the ECM stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P010012 or P010014.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [A] through [B] again.
- [A] to [B]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C27) Click Connector(C27)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C27-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V
C27-3 (FG) - C27-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V

Post-procedure1

(d) Turn the ignition switch off and wait for at least 30 seconds.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C27) Click Connector(C27)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C27-3 (FG)	Ignition switch off	2.09 to 2.31 kΩ	kΩ

Post-procedure2

(g) None

GO TO STEP 5

2.	INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Click here

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	CHECK WHETHER DTC OUTPUT RECURS (DTC P010012 OR P010014)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P010012 or P010014 is output	B

Post-procedure1

END

REPLACE ECM

5.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C27,C53) Click Connector(C27) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C53-108 (VCVG)	Always	Below 1 Ω	Ω
C27-3 (FG) - C53-140 (VG)	Always	Below 1 Ω	Ω
C27-2 (E2G) - C53-107 (E2G)	Always	Below 1 Ω	Ω
C27-4 (VCC) or C53-108 (VCVG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C27-3 (FG) or C53-140 (VG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C27-2 (E2G) or C53-107 (E2G) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Ground (P010511)

DESCRIPTION

The manifold absolute pressure sensor detects the intake manifold pressure as a change in voltage. The ECM calculates the intake manifold pressure based on this voltage. The ECM calculates the EGR valve assembly and purge VSV opening amount according to changes in the intake manifold pressure and also detects malfunctions of the manifold absolute pressure sensor using these changes in pressure.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P010511	Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Ground	The manifold absolute pressure sensor output voltage is less than 0.5 V for 0.5 seconds or more (1 trip detection logic).	Open or short in manifold absolute pressure sensor circuit Manifold absolute pressure sensor ECM	Comes on	Engine	A	SAE Code: P0107

HINT:

When this DTC is output, check the intake manifold absolute pressure in the Data List. Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.

DTC No.	Intake Manifold Absolute Pressure	Malfunction
P010511	Approximately 0 kPa (0 psi)	Short to ground in PIM circuit Short in PIM to EPIM circuit Open in VCPM circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

The ECM monitors the manifold absolute pressure sensor voltage and uses this value to calculate the intake manifold pressure. When the manifold absolute pressure sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the manifold absolute pressure circuit, illuminates the MIL and stores a DTC.

Example:

If the manifold absolute pressure sensor output voltage is less than 0.5 V for 0.5 seconds or more, the ECM stores this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P010511.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the manifold absolute pressure sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C26) Click Connector(C26)

Tester Connection	Condition	Specified Condition	Result
C26-3 (VC) - C26-1 (E2)	Ignition switch ON	4.75 to 5.25 V	V
C26-2 (PIM) - C26-1 (E2)	Ignition switch ON	3.0 to 5.25 V	V

Post-procedure1

(d) Turn the ignition switch off and wait for at least 30 seconds.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C26) Click Connector(C26)

Tester Connection	Condition	Specified Condition	Result
C26-3 (VC) - C26-2 (PIM)	Ignition switch off	171 to 189 kΩ	kΩ

Post-procedure2

(g) None

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

2.	CHECK HARNESS AND CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the manifold absolute pressure sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C26,C53) Click Connector(C26) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C26-3 (VC) - C53-89 (VCPM)	Always	Below 1 Ω	Ω
C26-2 (PIM) or C53-87 (PIM) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Battery or Open (P010515)

DESCRIPTION

Refer to DTC P010511.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P010515	Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Battery or Open	The manifold absolute pressure sensor output voltage is higher than 4.5 V for 0.5 seconds or more (1 trip detection logic).	Open or short in manifold absolute pressure sensor circuit Manifold absolute pressure sensor ECM	Comes on	Engine	A	SAE Code: P0108

HINT:

When this DTC is output, check the intake manifold absolute pressure in the Data List. Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.

DTC No.	Intake Manifold Absolute Pressure	Malfunction
P010515	Higher than 130 kPa (18.85 psi)	Short in VCPM to PIM circuit Open in PIM circuit Open in EPIM circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

Example:

If the manifold absolute pressure sensor output voltage is higher than 4.5 V for 0.5 seconds or more, the ECM stores this DTC

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P010515.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P010511.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the manifold absolute pressure sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C26) Click Connector(C26)

Tester Connection	Condition	Specified Condition	Result
C26-3 (VC) - C26-1 (E2)	Ignition switch ON	4.75 to 5.25 V	V
C26-2 (PIM) - C26-1 (E2)	Ignition switch ON	3.0 to 5.25 V	V

Post-procedure1

(d) Turn the ignition switch off and wait for at least 30 seconds.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C26) Click Connector(C26)

Tester Connection	Condition	Specified Condition	Result
C26-1 (E2) - Body ground	Ignition switch off	Below 1 Ω	Ω
C26-3 (VC) - C26-2 (PIM)	Ignition switch off	171 to 189 kΩ	kΩ

Post-procedure2

(g) None

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

2.	CHECK HARNESS AND CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the manifold absolute pressure sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C26,C53) Click Connector(C26) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C26-1 (E2) - C53-88 (EPIM)	Always	Below 1 Ω	Ω
C26-2 (PIM) - C53-87 (PIM)	Always	Below 1 Ω	Ω
C26-2 (PIM) or C53-87 (PIM) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground (P011011)

DESCRIPTION

The intake air temperature sensor, mounted on the mass air flow meter sub-assembly, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes.

The intake air temperature detected by the inlet air temperature sensor is converted to a voltage value inside the intake airflow meter assembly, and the voltage value is then output to the ECM. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

HINT:

When DTC P011011 is stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P011011	Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground	The intake air temperature sensor output voltage is below 0.663 V for 0.5 seconds or more (1 trip detection logic).	Short in intake air temperature sensor circuit Intake air temperature sensor (mass air flow meter sub-assembly) ECM	Comes on	Engine	A	SAE Code: P0112

HINT:

When this DTC is output, check the intake air temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temperature.

DTC No.	Intake Air Temperature	Malfunction
P011011	-40°C (-40°F) or less	Short to ground in THA circuit Short in THA to E2G circuit Open in VCC circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Click here

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the intake air temperature sensor is less than 0.142 V for 0.5 seconds or more, the ECM determines that the intake air temperature sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 0.5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C27) Click Connector(C27)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C27-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V
C27-1 (THA) - C27-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V

Post-procedure1

(d) Turn the ignition switch off and wait for at least 30 seconds.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C27) Click Connector(C27)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C27-1 (THA)	Ignition switch ON	2.565 to 2.835 kΩ	kΩ

Post-procedure2

(g) None

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C27,C53) Click Connector(C27) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C53-108 (VCVG)	Always	Below 1 Ω	Ω
C27-1 (THA) or C53-139 (THA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open (P011015)

DESCRIPTION

Refer to DTC P011011.

Click here

HINT:

When DTC P011015 is stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P011015	Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open	The intake air temperature sensor output voltage is higher than 3.76 V for 0.5 seconds or more (1 trip detection logic).	Open or short in intake air temperature sensor circuit Intake air temperature sensor (mass air flow meter sub-assembly) ECM	Comes on	Engine	A	SAE Code: P0113

HINT:

When this DTC is output, check the intake air temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temperature.

DTC No.	Intake Air Temperature	Malfunction
P011015	Higher than 123°C (253°F)	Short to B in THA circuit Open in THA circuit Open in ETHA circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Click here

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the intake air temperature sensor is higher than 3.76 V for 0.5 seconds or more, the ECM determines that the intake air temperature sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Refer to DTC P011011.

Click here

WIRING DIAGRAM

Refer to DTC P011011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C27) Click Connector(C27)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C27-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V
C27-1 (THA) - C27-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V

Post-procedure1

(d) Turn the ignition switch off and wait for at least 30 seconds.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C27) Click Connector(C27)

Tester Connection	Condition	Specified Condition	Result
C27-2 (E2G) - Body ground	Ignition switch off	Below 1 Ω	Ω
C27-4 (VCC) - C27-1 (THA)	Always	2.565 to 2.835 kΩ	kΩ

Post-procedure2

(g) None

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C27,C53) Click Connector(C27) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C27-1 (THA) - C53-139 (THA)	Always	Below 1 Ω	Ω
C27-2 (E2G) - C53-107 (E2G)	Always	Below 1 Ω	Ω
C27-1 (THA) or C53-139 (THA) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Coolant Temperature Sensor 1 Circuit Short to Ground (P011511)

DESCRIPTION

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The structure of the thermistor in the engine coolant temperature sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

Refer to DTC P011011.

Click here

HINT:

When DTC P011511 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P011511

Engine Coolant Temperature Sensor 1 Circuit Short to Ground

Diagnosis condition:

Ignition switch ON

Abnormal condition:

The engine coolant temperature sensor output voltage is less than 0.142 V.

Malfunction time:

0.5 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection:

Engine coolant temperature sensor

Short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM

Comes on

Engine

SAE Code: P0117

HINT:

When this DTC is output, check the engine coolant temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

DTC No.	Coolant Temperature	Malfunction
P011511	Higher than 135°C (275°F)	Short to ground in THW circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Click here

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the engine coolant temperature sensor is less than 0.142 V for 0.5 seconds or more, the ECM determines that the engine coolant temperature sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 0.5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If DTC P011511 is stored, check that the engine does not overheat (DTC P011511 may be stored due to engine overheating).

PROCEDURE

1.	READ VALUE USING GTS (COOLANT TEMPERATURE)

Pre-procedure1

(a) Disconnect the engine coolant temperature sensor connector.

*1	Engine Coolant Temperature Sensor
*2	ECM

Procedure1

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

GTS Display	Specified Condition
Coolant Temperature	-40°C (-40°F)

Result	Proceed to
The value of Coolant Temperature is -40 °C	A
None of the above conditions are met	B

Post-procedure1

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

2.	CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the engine coolant temperature sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C39,C53) Click Connector(C39) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C39-2 (THW) or C53-124 (THW) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open (P011515)

DESCRIPTION

Refer to DTC P011511.

Click here

HINT:

When DTC P011515 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P011515

Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open

Diagnosis condition:

Ignition switch ON

Abnormal condition:

The engine coolant temperature sensor output voltage is higher than 4.91 V.

Malfunction time:

0.5 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection:

Engine coolant temperature sensor

Open or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM

Comes on

Engine

SAE Code: P0118

HINT:

When this DTC is output, check the engine coolant temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

DTC No.	Coolant Temperature	Malfunction
P011515	-40°C (-40°F)	Short to B in THW circuit Open in THW circuit Open in ETHW circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

Click here

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the engine coolant temperature sensor is higher than 4.91 V for 0.5 seconds or more, the ECM determines that the engine coolant temperature sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Refer to DTC P011511.

Click here

WIRING DIAGRAM

Refer to DTC P011511.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (ENGINE COOLANT TEMPERATURE SENSOR)

Pre-procedure1

(a) Disconnect the engine coolant temperature sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C39) Click Connector(C39)

Tester Connection	Condition	Specified Condition	Result
C39-2 (THW) - Body ground	Ignition switch ON	0 to 5.5 V	V

Post-procedure1

(d) None

GO TO STEP 4

2.	READ VALUE USING GTS (COOLANT TEMPERATURE)

Pre-procedure1

(a) Disconnect the engine coolant temperature sensor connector.

(b) Connect terminals 2 (THW) and 1 (E2) of the engine coolant temperature sensor connector on the wire harness side.

Engine Coolant Temperature Sensor

ECM

Front view of wire harness connector

(to Engine Coolant Temperature Sensor)

Procedure1

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

GTS Display	Specified Condition
Coolant Temperature	140°C (284°F)

Result	Proceed to
The value of Coolant Temperature is more than 140 °C	A
None of the above conditions are met	B

Post-procedure1

(d) None

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

3.	CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the engine coolant temperature sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C39,C53) Click Connector(C39) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C39-2 (THW) - C53-124 (THW)	Always	Below 1 Ω	Ω
C39-1 (E2) - C53-123 (ETHW)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

Pre-procedure1

(a) Disconnect the engine coolant temperature sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C39,C53) Click Connector(C39) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C39-2 (THW) or C53-124 (THW) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)

DESCRIPTION

Refer to DTC P011511.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P01152A	Engine Coolant Temperature Sensor 1 Signal Stuck in Range	Either of the following conditions is met (2 trip detection logic): When engine is started cold and warmed up, the engine coolant temperature sensor value does not change. After the warmed up engine is stopped and the next cold engine start is performed, the engine coolant temperature sensor value does not change.	Water inlet with thermostat sub-assembly (thermostat) Engine coolant temperature sensor	Comes on	Engine	B	SAE Code: P0116

MONITOR DESCRIPTION

Engine Coolant Temperature Sensor Cold Start Monitor

When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and this DTC is stored.

Engine Coolant Temperature Sensor Soak Monitor

If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and this DTC is stored.

MONITOR STRATEGY

Required Sensors/Components	Engine coolant temperature sensor
Frequency of Operation	Once per driving cycle

CONFIRMATION DRIVING PATTERN

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
Check that the engine coolant temperature is 60°C (140°F) or less.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and idle it for 5 minutes or more [B].
HINT:

If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P01152A.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [D] and [E].
With the engine running, drive the Toyota Prius vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- In the event of the drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed.
- If the engine stops, further depress the accelerator pedal to restart the engine.
Check the DTC judgment result again [E].
HINT:

If the judgment result is INCOMPLETE, perform steps [D] and [E] again.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If any of DTCs P011511 or P011515 are output simultaneously with DTC P01152A, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
When this DTC is output, check the engine coolant temperature using the GTS. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature. If the value of Coolant Temperature is lower than the actual engine coolant temperature, the engine coolant temperature sensor circuit may be malfunctioning. In this case, check the wire harnesses and connectors (and their connection condition) between the ECM and the engine coolant temperature sensor first.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P01152A)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P01152A and other DTCs are output	A
P01152A is output	B

HINT:

If any DTCs other than P01152A are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground (P012011)

DESCRIPTION

The throttle position sensor is built into the throttle body assembly and detects the opening angle of the throttle valve. This sensor is a non-contact type sensor. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds.

The throttle position sensor has 2 sensor circuits, VTA1 and VTA2, each of which transmits a signal. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA1 and VTA2 terminals of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to a request from the hybrid system. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.

HINT:

When throttle position sensor DTCs are output, check the throttle valve opening angle using the GTS. Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage.
Throttle Position Sensor No.1 Voltage is the VTA1 signal, and Throttle Position Sensor No.2 Voltage is the VTA2 signal.
Reference (Normal Condition):

GTS Display

Accelerator Pedal Fully Released

Throttle Position Sensor No.1 Voltage

0.6 to 1.1 V

Throttle Position Sensor No.2 Voltage

2.1 to 3.1 V

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P012011	Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground	The output voltage of VTA1 is less than 0.56 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body assembly) Short in VTA1 circuit Open in VCTA circuit ECM	Comes on	Engine	A	SAE Code: P0122

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA1 terminal voltage is less than the threshold, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P012011.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

When this DTC is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle valve opening angle by the return spring. The ECM then adjusts the engine output, by controlling the fuel injection (intermittent fuel cut) and ignition timing, in accordance with the engine torque request signal sent from the hybrid Toyota Prius vehicle control ECU, to allow the vehicle to continue being driven at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	READ VALUE USING GTS (THROTTLE POSITION SENSOR NO.1 VOLTAGE)

Pre-procedure1

(a) Read the values displayed on the GTS.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage

(b) Disconnect the throttle body assembly connector.

Procedure1

(c) Compare the value of the Data List item Throttle Position Sensor No. 1 Voltage after disconnecting the throttle body assembly connector to the value when the connector was connected.

Result	Proceed to
Changes from less than 0.56 V to higher than 4.535 V	A
Does not change from less than 0.56 V	B

Post-procedure1

(d) None

REPLACE THROTTLE BODY ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C53-134 (VCTA)	Always	Below 1 Ω	Ω
C24-6 (VTA) or C53-135 (VTA1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open (P012015)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P012015	Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open	The output voltage of VTA1 is higher than 4.535 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body assembly) Open in VTA1 circuit Open in ETA circuit Short between VCTA and VTA1 circuits ECM	Comes on	Engine	A	SAE Code: P0123

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA1 terminal voltage is higher than the threshold, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P012015.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-6 (VTA) - C53-135 (VTA1)	Always	Below 1 Ω	Ω
C24-3 (E2) - C53-133 (ETA)	Always	Below 1 Ω	Ω
C24-5 (VC) or C53-134 (VCTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-6 (VTA) or C53-135 (VTA1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C24-3 (E2)	Ignition switch ON	4.5 to 5.5 V	V
C24-6 (VTA) - C24-3 (E2)	Ignition switch ON	3.0 to 5.0 V	V

Post-procedure1

(d) None

REPLACE ECM

3.	CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C24-6 (VTA)	Ignition switch off	190 to 210 kΩ	kΩ

Post-procedure1

REPLACE ECM

4.	READ VALUE USING GTS (THROTTLE POSITION SENSOR NO.1 VOLTAGE)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

Procedure1

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage

HINT:

Use the snapshot function to record the value displayed or make a note of it.

Post-procedure1

Pre-procedure2

(d) Connect terminals 3 (E2) and 6 (VTA) of the throttle body assembly connector on the wire harness side.

NOTICE:

If the VTA terminal voltage or the resistance between VTA and E2 is abnormal and terminals 3 (E2) and 6 (VTA) of the throttle body assembly connector are connected, excessive current may flow through the circuit. In this case, do not connect the terminals.

Procedure2

(e) Compare the Toyota Prius vehicle of the Data List item Throttle Position Sensor No.1 Voltage after the circuit is shorted to the value when the throttle body assembly connector was connected.

Result	Proceed to
Changes from higher than 4.535 V to less than 0.56 V	A
Does not change from higher than 4.535 V	B

Post-procedure2

(f) None

REPLACE THROTTLE BODY ASSEMBLY

REPLACE ECM

Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range (P01201C)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P01201C	Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range	The difference between the output voltage of VTA1 and VTA2 is less than 0.8 V, or higher than 1.6 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body assembly) Throttle position sensor circuit ECM	Comes on	Engine	A	SAE Code: P0121

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.

This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm the proper operation of the throttle position sensor and VTA1.

For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA1 and VTA2. If the output voltage difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction of the throttle position sensor, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P01201C.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

DTC P01201C is stored when the VTA1 and VTA2 output voltages are not consistent with the sensor characteristics. Therefore, check the freeze frame data for this DTC. Use the following formula to confirm the relative differences in voltage.
Characteristic Sensor Output:

VTA2 x 0.8 is approximately equal to VTA1 1.11 V

VTA1: Throttle Position Sensor No.1 Voltage

VTA2: Throttle Position Sensor No.2 Voltage

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C53-134 (VCTA)	Always	Below 1 Ω	Ω
C24-6 (VTA) - C53-135 (VTA1)	Always	Below 1 Ω	Ω
C24-4 (VTA2) - C53-101 (VTA2)	Always	Below 1 Ω	Ω
C24-3 (E2) - C53-133 (ETA)	Always	Below 1 Ω	Ω
C24-5 (VC) or C53-134 (VCTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-6 (VTA) or C53-135 (VTA1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-4 (VTA2) or C53-101 (VTA2) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

(d) Inspect the condition of the terminals of the connectors.

HINT:

Click here

Post-procedure1

(e) None

GO TO STEP 5

2.	REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the wire harness or connector.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	CHECK WHETHER DTC OUTPUT RECURS (DTC P01201C)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P01201C is output	B

Post-procedure1

END

5.	CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C24-6 (VTA)	Ignition switch off	190 to 210 kΩ	kΩ
C24-5 (VC) - C24-4 (VTA2)	Ignition switch off	190 to 210 kΩ	kΩ

Post-procedure1

REPLACE THROTTLE BODY ASSEMBLY

REPLACE ECM

O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open (P013613,P013617,P01361C)

DESCRIPTION

Refer to DTC P003612.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P013613	O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open	Abnormal output voltage: During active air fuel ratio control, the following conditions (a) and (b) are met for a certain amount of time (2 trip detection logic): (a) Heated oxygen sensor voltage does not increase to 0.71 V or higher. (b) Heated oxygen sensor voltage does not decrease to less than 0.21 V.	Heated oxygen sensor (sensor 2) circuit Heated oxygen sensor (sensor 2) Air fuel ratio sensor (sensor 1) Gas leak from exhaust system EGR valve assembly Fuel pressure Fuel system PCV valve and hose Intake system	Comes on	Engine	B	SAE Code: P0136
P013617	O2 Sensor Circuit Bank 1 Sensor 2 Circuit Voltage Above Threshold	Low voltage (open): During active air fuel ratio control, the following conditions (a) and (b) are met for certain amount of time (2 trip detection logic): (a) Heated oxygen sensor output voltage less than 0.21 V. (b) Target air fuel ratio is rich.	Heated oxygen sensor (sensor 2) circuit Heated oxygen sensor (sensor 2) Air fuel ratio sensor (sensor 1) Gas leak from exhaust system EGR valve assembly	Comes on	Engine	B	SAE Code: P0137
P01361C	O2 Sensor Circuit Bank 1 Sensor 2 Circuit Voltage Out of Range	High voltage (short): During active air fuel ratio control, the following conditions (a) and (b) are met for a certain amount of time (2 trip detection logic): (a) Heated oxygen sensor output voltage is higher than 0.71 V. (b) Target air fuel ratio is lean.	Heated oxygen sensor (sensor 2) circuit Heated oxygen sensor (sensor 2) Air fuel ratio sensor (sensor 1) EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P0138

MONITOR DESCRIPTION

Active Air fuel Ratio Control

The ECM usually performs air fuel ratio feedback control so that the air fuel ratio sensor output indicates a near stoichiometric air fuel ratio. This Toyota Prius vehicle includes active air fuel ratio control in addition to regular air fuel ratio control. The ECM performs active air fuel ratio control to detect any deterioration in the Three-Way Catalytic Converter (TWC) and any malfunctions of the heated oxygen sensor (refer to the diagram below).

Active air fuel ratio control is performed for approximately 30 seconds while driving with a warm engine. During active air fuel ratio control, the air fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is stored.

Abnormal Heated Oxygen Sensor Output Voltage (DTC P013613)

While the ECM is performing active air fuel ratio control, the air fuel ratio is forcibly regulated to become rich or lean. If the sensor is not functioning properly, the variation in output voltage is small. For example, when the heated oxygen sensor voltage does not increase to 0.71 V or higher during active air fuel ratio control, the ECM determines that the sensor output voltage is abnormal and stores DTC P013613.

Open or Short in Heated Oxygen Sensor Circuit (DTC P013617 or P01361C)

During active air fuel ratio control, the ECM calculates the Oxygen Storage Capacity (OSC)* of the Three-Way Catalytic Converter (TWC) by forcibly regulating the air fuel ratio to become rich or lean.

If the heated oxygen sensor has an open circuit, or the output voltage of the sensor noticeably decreases, the OSC will be an extremely high value. Even if the ECM attempts to continue regulating the air fuel ratio to become rich or lean, the heated oxygen sensor output will not change.

While performing active air fuel ratio control, when the target air fuel ratio is rich and the heated oxygen sensor output voltage is less than 0.21 V (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P013617.

When the target air fuel ratio is lean and the output voltage is higher than 0.71 V (rich) during active air fuel ratio control, the ECM determines that the sensor output voltage is abnormally high and stores DTC P01361C.

HINT:

*: The TWC has the capability to store oxygen. The OSC and the emission purification capacity of the TWC are mutually related. The ECM determines whether the catalyst has deteriorated based on the calculated OSC value.

Click here

MONITOR STRATEGY

Required Sensors/Components (Main)

Heated oxygen sensor (sensor 2)

Required Sensors/Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Mass air flow meter sub-assembly

Throttle position sensor

Air fuel ratio sensor

Frequency of Operation

Once per driving cycle

TYPICAL ENABLING CONDITIONS

Heated Oxygen Sensor Voltage Check (Voltage Malfunction, High Voltage and Low Voltage)

Active air fuel ratio control	Executing
Active air fuel ratio control begins when all of following conditions met:	-
Auxiliary battery voltage	11 V or higher
Engine coolant temperature	75°C (167°F) or higher
Idling	Off
Engine speed	Less than 4000 rpm
Air fuel ratio sensor status	Activated
Fuel system status	Closed loop
Engine load	10% or higher, and less than 70%

TYPICAL MALFUNCTION THRESHOLDS

P013613: Heated Oxygen Sensor Voltage Check (Voltage Malfunction)

Either of following conditions is met	1 or 2
1. Both of following conditions are met	-
(a) Commanded air fuel ratio	14.4 or less
(b) Heated oxygen sensor voltage	0.21 V or higher, and less than 0.71 V
2. Both of following conditions are met	-
(c) Commanded air fuel ratio	14.8 or more
(d) Heated oxygen sensor voltage	0.21 V or higher, and less than 0.71 V

P013617: Heated Oxygen Sensor Voltage Check (Low Voltage)

Both of following conditions are met	-
(a) Commanded air fuel ratio	14.4 or less
(b) Heated oxygen sensor voltage	Less than 0.21 V

P01361C: Heated Oxygen Sensor Voltage Check (High Voltage)

Both of following conditions are met	-
(a) Commanded air fuel ratio	14.8 or more
(b) Heated oxygen sensor voltage	Higher than 0.71 V

CONFIRMATION DRIVING PATTERN

HINT:

This confirmation driving pattern is used for the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.
Performing this confirmation driving pattern will activate the heated oxygen sensor monitor (the catalyst monitor is performed simultaneously). This is very useful for verifying the completion of a repair.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [B].
With the engine running, drive the Toyota Prius vehicle at 75 to 120 km/h (46 to 75 mph) for 10 minutes or more [C].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P013613, P013617 or P01361C.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [C] and [D] again.

WIRING DIAGRAM

Refer to DTC P003612.

Click here

CAUTION / NOTICE / HINT

HINT:

Malfunctioning areas can be identified by performing the Active Test "Control the Injection Volume for A/F Sensor". This Active Test can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following procedure describes how to perform the Active Test "Control the Injection Volume for A/F Sensor" using the GTS.

Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
Idle the engine for 5 minutes or more with park (P) selected.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Current B1S1 and O2 Sensor Voltage B1S2.
Perform the Active Test with the engine idling (change the fuel injection volume).
Monitor the output voltage of the air fuel ratio sensor (A/F (O2) Sensor Current B1S1) and heated oxygen sensor (O2 Sensor Voltage B1S2) displayed on the GTS.

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
Each sensor reacts in accordance with the increases and decreases in the fuel injection volume.

Standard:

GTS Display (Sensor)	Injection Volume	Status	Voltage
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	12.5%	Rich	Below -0.075 mA
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	-12.5%	Lean	Higher than 0.037 mA
O2 Sensor Voltage B1S2 (Heated oxygen)	12.5%	Rich	Higher than 0.55 V
O2 Sensor Voltage B1S2 (Heated oxygen)	-12.5%	Lean	Below 0.4 V

NOTICE:

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Performing the Active Test "Control the Injection Volume for A/F Sensor" allows the output voltage of the air fuel ratio sensor and heated oxygen sensor to be checked and graphed.
To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2; and then press the graph button on the Data List view.

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

1.	READ OUTPUT DTC (DTC P013613, P013617 OR P01361C)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P013613, P013617 or P01361C and other DTCs are output	A
P01361C is output	B
P013617 is output	C
P013613 is output	D

HINT:

If any DTCs other than P013613, P013617 and P01361C are output, troubleshoot those DTCs first.

GO TO DTC CHART

GO TO STEP 43

GO TO STEP 7

2.	READ VALUE USING GTS (O2 SENSOR VOLTAGE B1S2)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

(d) Enter the following menus: Powertrain / Engine / Data List / O2 Sensor Voltage B1S2.

Procedure1

(e) Read the heated oxygen sensor output voltage while idling.

Powertrain > Engine > Data List

Tester Display
O2 Sensor Voltage B1S2

Result	Proceed to
The value of O2 Sensor Voltage B1S2 is 1.0 V or more	A
None of the above conditions are met	B

Post-procedure1

(f) None

GO TO STEP 5

3.	INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

Pre-procedure1

(a) Disconnect the heated oxygen sensor connector.

*a	Component without harness connected (Heated Oxygen Sensor)

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
2 ( B) - 4 (E2)	Always	10 kΩ or higher	kΩ
2 ( B) - 3 (OX1B)	Always	10 kΩ or higher	kΩ

Post-procedure1

REPLACE HEATED OXYGEN SENSOR

4.	CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

Pre-procedure1

(a) Turn the ignition switch off and wait for 5 minutes or more.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C53) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C53-56 (HT1B) - C53-100 (OX1B)	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)

5.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

(d) Change the fuel injection volume using the GTS, and monitor the output voltage of the air fuel ratio sensor (A/F (O2) Sensor Current B1S1) and heated oxygen sensor (O2 Sensor Voltage B1S2) displayed on the GTS.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
The air fuel ratio sensor is displayed as A/F (O2) Sensor Current B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the GTS.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

GTS Display (Sensor)	Voltage Variation	Proceed to
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	Alternates between approximately -0.5 to 0.5 mA	OK
	Remains at higher than 0.5 mA	NG
	Remains at less than -0.5 mA	NG

Post-procedure1

(e) None

GO TO STEP 38

6.	INSPECT AIR FUEL RATIO SENSOR

Pre-procedure1

HINT:

This air fuel ratio sensor test is to check the air fuel ratio sensor current during the fuel-cut operation. When the sensor is normal, the sensor current will indicate below 2.2 mA in this test.

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.

(d) Stop the vehicle.

(e) With brake (B) selected and the engine running, drive the Toyota Prius vehicle at 75 km/h (46 mph) or more and decelerate the vehicle for 5 seconds or more. Perform this 3 times.

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.

Procedure1

(f) Read the value of the air fuel ratio sensor current while the fuel-cut operation is performed.

Powertrain > Engine > Data List

Tester Display
A/F (O2) Sensor Current B1S1

HINT:

To measure the air fuel ratio sensor current precisely, perform the fuel-cut operation as long as possible.
If it is difficult to measure the air fuel ratio sensor current, use the snapshot function of the GTS.

Result	Proceed to
The value of A/F (O2) Sensor Current B1S1 is less than 2.2 mA	A
None of the above conditions are met	B

Post-procedure1

(g) None

GO TO STEP 46

GO TO STEP 38

7.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

(d) Change the fuel injection volume using the GTS, and monitor the output voltage of the heated oxygen sensor (O2 Sensor Voltage B1S2) displayed on the GTS.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
O2 Sensor Voltage B1S2

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
The heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Standard Voltage:

Fluctuates between 0.4 V or less, and 0.55 V or higher.

Post-procedure1

(e) None

GO TO STEP 43

8.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
The air fuel ratio sensor is displayed as A/F (O2) Sensor Current B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the GTS.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

GTS Display (Sensor)	Voltage Variation	Proceed to
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	Alternates between approximately -0.5 to 0.5 mA	OK
	Remains at higher than 0.5 mA	NG
	Remains at less than -0.5 mA	NG

Post-procedure1

(e) None

GO TO STEP 38

9.	CHECK PCV HOSE CONNECTIONS

Click here

REPAIR OR REPLACE PCV HOSE

10.	CHECK INTAKE SYSTEM

Click here

REPAIR OR REPLACE INTAKE SYSTEM

11.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Click here

Status A/F (O2) Sensor Current B1S1	Status O2 Sensor Voltage B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Suspected Trouble Area	Proceed to
Lean/Rich	Lean/Rich	Normal	-	A
Lean	Lean	Actual air fuel ratio lean	PCV valve and hose PCV hose connections Fuel injector assembly blockage Gas leak from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor EGR valve assembly
Rich	Rich	Actual air fuel ratio rich	Fuel injector assembly leak or blockage Gas leak from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Lean	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
Rich	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B

GO TO STEP 20

12.	READ VALUE USING GTS (COOLANT TEMPERATURE)

Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

13.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Click here

GO TO STEP 15

14.	INSPECT EGR VALVE ASSEMBLY

Click here

REPLACE EGR VALVE ASSEMBLY

15.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Click here

Result	Proceed to
The value of Mass Air Flow Sensor is between 4.5 and 8.5 gm/sec	A
None of the above conditions are met	B

GO TO STEP 27

16.	CHECK FUEL PRESSURE

Click here

REPAIR OR REPLACE FUEL SYSTEM

17.	CHECK FOR EXHAUST GAS LEAK

Click here

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here REPAIR OR REPLACE EXHAUST SYSTEM

18.	INSPECT IGNITION SYSTEM

Click here

HINT:

Perform "Inspection After Repair" after repairing or replacing the ignition system.

Click here

REPAIR OR REPLACE IGNITION SYSTEM

19.	INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

Click here

GO TO STEP 27

REPLACE FUEL INJECTOR ASSEMBLY

20.	INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Click here

REPLACE AIR FUEL RATIO SENSOR

21.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

Click here

GO TO STEP 30

22.	CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.	REPLACE AIR FUEL RATIO SENSOR

Click here

24.

CLEAR DTC

Click here

25.	CHECK WHETHER DTC OUTPUT RECURS (DTC P017100 OR P017200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P013613 is output	B

Post-procedure1

END

26.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Click here

27.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

Click here

28.

CLEAR DTC

Click here

29.	CHECK WHETHER DTC OUTPUT RECURS (DTC P017100 OR P017200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P013613 is output	B

Post-procedure1

END

GO TO STEP 34

30.	INSPECT EFI-MAIN NO. 2 RELAY

Click here

REPLACE EFI-MAIN NO. 2 RELAY

31.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY)

32.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

33.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - AIR FUEL RATIO SENSOR)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

34.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

35.	REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Click here

36.

CLEAR DTC

Click here

37.	CHECK WHETHER DTC OUTPUT RECURS (DTC P017100 OR P017200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P013613 is output	B

Post-procedure1

END

REPLACE ECM

38.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 40

39.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

40.	REPLACE AIR FUEL RATIO SENSOR

HINT:

Click here

41.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

42.	CHECK WHETHER DTC OUTPUT RECURS (DTC P013613 OR P01361C)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Check that the DTC judgment result is NORMAL. If the DTC judgment result is INCOMPLETE, perform the confirmation drive pattern again but increase the vehicle speed.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P013613 or P01361C is output)

Post-procedure1

(d) None

END

REPLACE HEATED OXYGEN SENSOR

43.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

REPAIR OR REPLACE EXHAUST SYSTEM

44.	INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

Click here

REPLACE HEATED OXYGEN SENSOR

45.	CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

Pre-procedure1

(a) Disconnect the heated oxygen sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C48,C53) Click Connector(C48) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C48-1 (HT1B) - C53-56 (HT1B)	Always	Below 1 Ω	Ω
C48-3 (OX1B) - C53-100 (OX1B)	Always	Below 1 Ω	Ω
C48-4 (E2) - C53-99 (O1B-)	Always	Below 1 Ω	Ω
C48-1 (HT1B) or C53-56 (HT1B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C48-3 (OX1B) or C53-100 (OX1B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

46.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 48

47.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

48.	REPLACE HEATED OXYGEN SENSOR

HINT:

Click here

49.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

50.	CHECK WHETHER DTC OUTPUT RECURS

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Check that the DTC judgment result is NORMAL. If the DTC judgment result is INCOMPLETE, perform the confirmation drive pattern again but increase the vehicle speed.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P013613, P013617 or P01361C is output)

Post-procedure1

(d) None

END

REPLACE AIR FUEL RATIO SENSOR

System Too Lean Bank 1 (P017100,P017200)

DESCRIPTION

The fuel trim is related to the feedback compensation value, not to the basic injection duration. The fuel trim consists of both the short-term and long-term fuel trims.

The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at the stoichiometric air fuel ratio. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P017100	System Too Lean Bank 1	With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).	Intake system Fuel injector assembly Mass air flow meter sub-assembly Engine coolant temperature sensor Fuel pressure Gas leak from exhaust system Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) PCV valve and hose PCV hose connections EGR valve assembly Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P0171
P017200	System Too Rich Bank 1	With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).	Fuel injector assembly Mass air flow meter sub-assembly Engine coolant temperature sensor Ignition system Fuel pressure Gas leak from exhaust system Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) EGR valve assembly Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P0172

HINT:

When DTC P017100 is stored, the actual air fuel ratio is on the lean side. When DTC P017200 is stored, the actual air fuel ratio is on the rich side.
If the Toyota Prius vehicle runs out of fuel, the air fuel ratio is lean and DTC P017100 may be stored. The MIL is then illuminated.
When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and the engine coolant temperature is higher than 75°C [167°F]), the system is functioning normally.

MONITOR DESCRIPTION

Under closed loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the fuel injection volumes estimated by the ECM also affect the average fuel trim learned value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learned value of the air fuel ratio). If the average fuel trim learned value exceeds the malfunction thresholds, the ECM interprets this as a malfunction of the fuel system and stores a DTC.

Example:

The average fuel trim learned value is 48% or higher, or -35% or less, the ECM interprets this as a fuel system malfunction.

MONITOR STRATEGY

Required Sensors/Components (Main)

Fuel system

Required Sensors/Components (Related)

Air fuel ratio sensor

Mass air flow meter sub-assembly

Crankshaft position sensor

Frequency of Operation

Continuous

TYPICAL ENABLING CONDITIONS

Fuel system status	Closed loop
Auxiliary battery voltage	11 V or higher
Either of the following conditions is met	1 or 2
1. Engine speed	Less than 1100 rpm
2. Engine load	10% or higher
Catalyst monitor	Not executed
Air fuel ratio imbalance of clogged EGR runner fail	Not set

TYPICAL MALFUNCTION THRESHOLDS

P017100 and P017200: Fuel-trim Lean/Rich

EVAP purge-cut	Executing
Either of the following conditions is met	1 or 2
1. Average between short-term fuel trim and long-term fuel trim	48% or higher (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim	-35% or less (varies with engine coolant temperature)

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the A/C switch and all accessories off [B].
With the engine warmed up, idle the engine for 5 minutes or more [C].
With the engine running, drive the Toyota Prius vehicle at a speed between 60 and 100 km/h (37 and 62 mph) for 5 minutes or more [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If no pending DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P003012 for the air fuel ratio sensor circuit.
Click here
Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.
Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P017100 OR P017200)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P017100 or P017200 and other DTCs are output	A
P017100 or P017200 is output	B

HINT:

If any DTCs other than P017100 or P017200 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

HINT:

Click here

OK:

PCV valve and hose are connected correctly and are not damaged.

REPAIR OR REPLACE PCV HOSE

3.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

4.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
The air fuel ratio sensor is displayed as A/F (O2) Sensor Current B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the GTS.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

GTS Display (Sensor)	Injection Volume	Status	Voltage
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	12.5%	Rich	Below -0.075 mA
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	-12.5%	Lean	Higher than 0.037 mA
O2 Sensor Voltage B1S2 (Heated oxygen)	12.5%	Rich	Higher than 0.55 V
O2 Sensor Voltage B1S2 (Heated oxygen)	-12.5%	Lean	Below 0.4 V

Status A/F (O2) Sensor Current B1S1	Status O2 Sensor Voltage B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Suspected Trouble Area	Proceed to
Lean/Rich	Lean/Rich	Normal	-	A
Lean	Lean	Actual air fuel ratio lean	PCV valve and hose PCV hose connections Fuel injector assembly blockage Gas leak from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor EGR valve assembly
Rich	Rich	Actual air fuel ratio rich	Fuel injector assembly leak or blockage Gas leak from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Lean	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
Rich	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B

Lean: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently higher than 0.037 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently below 0.4 V.
Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently higher than 0.55 V.
Lean/Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the output voltage of the fuel ratio sensor (A/F (O2) Sensor Current B1S1) or heated oxygen sensor (O2 Sensor Voltage B1S2) alternates correctly.

HINT:

Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1 and O2 Sensor Voltage B1S2].

Click here

Post-procedure1

(e) None

GO TO STEP 13

5.	READ VALUE USING GTS (COOLANT TEMPERATURE)

(a) Read the Data List twice, when the engine is both cold and warmed up.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Standard:

GTS Display	Condition	Specified Condition
Coolant Temperature	Cold engine	Same as ambient air temperature
Coolant Temperature	Warm engine	Between 75 and 100°C (167 and 212°F)

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

6.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 8

7.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

8.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

(c) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher with with the A/C switch and all accessories off.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

(d) Move the shift lever to P.

Procedure1

(e) Read Mass Air Flow Sensor with the engine speed at 2500 rpm.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor

HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, read the Data List after charge control has completed.

Result	Proceed to
The value of Mass Air Flow Sensor is between 4.5 and 8.5 gm/sec	A
None of the above conditions are met	B

Post-procedure1

(f) None

GO TO STEP 20

9.	CHECK FUEL PRESSURE

Click here

REPAIR OR REPLACE FUEL SYSTEM

10.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

REPAIR OR REPLACE EXHAUST SYSTEM

11.	INSPECT IGNITION SYSTEM

(a) Inspect the ignition system.

Click here

HINT:

If the spark plugs or ignition system malfunctions, engine misfire may occur. The misfire count can be read using the GTS. Enter the following menus: Powertrain / Engine / Data List / Misfire Count Cylinder #1 to Misfire Count Cylinder #4.
Perform "Inspection After Repair" after repairing or replacing the ignition system.
Click here

REPAIR OR REPLACE IGNITION SYSTEM

12.	INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

(a) Check the injection and volume.

Click here

HINT:

Refer to the fuel injector assembly inspection procedure.
If the fuel injector assemblies malfunction, engine misfire may occur. The misfire count can be read using the GTS. Enter the following menus: Powertrain / Engine / Data List / Misfire Count Cylinder #1 to Misfire Count Cylinder #4.

GO TO STEP 20

REPLACE FUEL INJECTOR ASSEMBLY

13.	INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Click here

REPLACE AIR FUEL RATIO SENSOR

14.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

Pre-procedure1

(a) Disconnect the air fuel ratio sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C45) Click Connector(C45)

Tester Connection	Condition	Specified Condition	Result
C45-2 ( B) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

GO TO STEP 23

15.	CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

Pre-procedure1

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C45,C53) Click Connector(C45) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C45-1 (HA1A) - C53-28 (HA1A)	Always	Below 1 Ω	Ω
C45-3 (A1A ) - C53-132 (A1A )	Always	Below 1 Ω	Ω
C45-4 (A1A-) - C53-131 (A1A-)	Always	Below 1 Ω	Ω
C45-1 (HA1A) or C53-28 (HA1A) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C45-3 (A1A ) or C53-132 (A1A ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C45-4 (A1A-) or C53-131 (A1A-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.	REPLACE AIR FUEL RATIO SENSOR

HINT:

Click here

17.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

18.	CHECK WHETHER DTC OUTPUT RECURS (DTC P017100 OR P017200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P017100 or P017200 is output	B

Post-procedure1

END

19.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

HINT:

Click here

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

(c) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher with with the A/C switch and all accessories off.

(d) Move the shift lever to P.

Procedure1

(e) Read Mass Air Flow Sensor with the engine speed at 2500 rpm.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor

HINT:

Standard:

GTS Display

Condition

Specified Condition

Mass Air Flow Sensor

Engine warmed up

Shift position: P

A/C: Off

Engine Speed: 2500 rpm

Between 4.5 and 8.5 gm/sec

Post-procedure1

(f) None

20.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

HINT:

Click here
Repair any problems.

21.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

22.	CHECK WHETHER DTC OUTPUT RECURS (DTC P017100 OR P017200)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P017100 or P017200 is output	B

Post-procedure1

END

GO TO STEP 27

23.	INSPECT EFI-MAIN NO. 2 RELAY

Click here

REPLACE EFI-MAIN NO. 2 RELAY

24.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition	Result
3 (EFI-MAIN NO. 2 relay) - Body ground	Always	11 to 14 V	V

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY)

25.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (EFI-MAIN NO. 2 relay) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

26.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - AIR FUEL RATIO SENSOR)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the air fuel ratio sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(C45) Click Connector(C45)

Tester Connection	Condition	Specified Condition	Result
5 (EFI-MAIN NO. 2 relay) - C45-2 ( B)	Always	Below 1 Ω	Ω
5 (EFI-MAIN NO. 2 relay) or C45-2 ( B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

27.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C27,C53) Click Connector(C27) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C53-108 (VCVG)	Always	Below 1 Ω	Ω
C27-3 (FG) - C53-140 (VG)	Always	Below 1 Ω	Ω
C27-2 (E2G) - C53-107 (E2G)	Always	Below 1 Ω	Ω
C27-4 (VCC) or C53-108 (VCVG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C27-3 (FG) or C53-140 (VG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C27-2 (E2G) or C53-107(E2G) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

28.	REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

Click here
If the result of the inspection performed in steps 8 and 19 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

29.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

30.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P017100 or P017200 is output	B

Post-procedure1

END

REPLACE ECM

Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground (P022011)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P022011	Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground	The output voltage of VTA2 is less than 2.05 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body assembly) Short in VTA2 circuit Open in VCTA circuit ECM	Comes on	Engine	A	SAE Code: P0222

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA2 terminal voltage is less than the threshold, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P022011.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	READ VALUE USING GTS (THROTTLE POSITION SENSOR NO.2 VOLTAGE)

Pre-procedure1

(a) Read the values displayed on the GTS.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.2 Voltage

(b) Disconnect the throttle body assembly connector.

Procedure1

(c) Compare the value of the Data List item Throttle Position Sensor No. 2 Voltage after disconnecting the throttle body assembly connector to the value when the connector was connected.

Result	Proceed to
Changes from less than 2.05 V to higher than 4.75 V	A
Does not change from less than 2.05 V	B

Post-procedure1

(d) None

REPLACE THROTTLE BODY ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C53-134 (VCTA)	Always	Below 1 Ω	Ω
C24-4 (VTA2) or C53-101 (VTA2) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open (P022015)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P022015	Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open	The output voltage of VTA2 is higher than 4.75 V, and VTA1 is less than 2.367 V for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body assembly) Open in VTA2 circuit Short between VCTA and VTA2 circuits ECM	Comes on	Engine	A	SAE Code: P0223

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA2 terminal voltage is higher than the threshold, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P022015.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-4 (VTA2) - C53-101 (VTA2)	Always	Below 1 Ω	Ω
C24-5 (VC) or C53-134 (VCTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-4 (VTA2) or C53-101 (VTA2) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C24-3 (E2)	Ignition switch ON	4.5 to 5.5 V	V
C24-4 (VTA2) - C24-3 (E2)	Ignition switch ON	3.0 to 5.0 V	V

Post-procedure1

(d) None

REPLACE ECM

3.	CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C24-4 (VTA2)	Ignition switch off	190 to 210 kΩ	kΩ

Post-procedure1

REPLACE ECM

4.	READ VALUE USING GTS (THROTTLE POSITION SENSOR NO.2 VOLTAGE)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.2 Voltage

HINT:

Use the snapshot function to record the value displayed or make a note of it.

(d) Turn the GTS off.

(e) Connect terminals 3 (E2) and 4 (VTA2) of the throttle body assembly connector on the wire harness side.

NOTICE:

If the VTA terminal voltage or the resistance between VTA2 and E2 is abnormal and terminals 3 (E2) and 4 (VTA2) of the throttle body assembly connector are connected, excessive current may flow through the circuit. In this case, do not connect the terminals.

(f) Turn the ignition switch ON.

Procedure1

(g) Compare the Toyota Prius vehicle of the Data List item Throttle Position Sensor No.2 Voltage after the circuit is shorted to the value when the throttle body assembly connector was connected.

Result	Proceed to
Changes from higher than 4.75 V to less than 2.05 V	A
Does not change from higher than 4.75 V	B

Post-procedure1

(h) None

REPLACE THROTTLE BODY ASSEMBLY

REPLACE ECM

Random/Multiple Cylinder Misfire Detected (P030000,P030027,P030085-P030400)

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P030000	Random/Multiple Cylinder Misfire Detected	Simultaneous misfiring of several cylinders occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	Engine	B	SAE Code: P0300
P030027	Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold	An emission deterioration misfire occurs (2 trip detection logic).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on	Engine	B	SAE Code: -
P030085	Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range	A misfire occurs that may damage the three-way catalytic converter (2 trip detection logic).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	Engine	B	SAE Code: -
P030100	Cylinder 1 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	Engine	B	SAE Code: P0301
P030200	Cylinder 2 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	Engine	B	SAE Code: P0302
P030300	Cylinder 3 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	Engine	B	SAE Code: P0303
P030400	Cylinder 4 Misfire Detected	Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks immediately when detected). An emission deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system EGR valve assembly ECM	Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected.	Engine	B	SAE Code: P0304

When DTCs for misfiring cylinders are randomly stored, but DTC P030000 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P030000 is only stored when several misfiring cylinders are detected at the same time.

MONITOR DESCRIPTION

The ECM illuminates the MIL and stores a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).

Within the first 1000 crankshaft revolutions after the engine starts, an excessive number of misfires approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs once.

The ECM flashes the MIL (immediate detection logic) and stores a DTC (2 trip detection logic) when either one of the following condition, which could cause damage to the three-way catalytic converter, is detected.

At a high engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected once.
At a normal engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.

MONITOR STRATEGY

Required Sensors/Components (Main)

Crankshaft position sensor

Camshaft position sensor

Required Sensors/Components (Related)

Engine coolant temperature

Intake air temperature sensor (mass air flow meter sub-assembly)

Mass air flow meter sub-assembly

Frequency of Operation

Continuous

TYPICAL ENABLING CONDITIONS

Misfire

Either of the following conditions is met	(a) or (b)
(a) Engine coolant temperature at engine start	Higher than -7°C (19°F)
(b) Engine coolant temperature	Higher than 20°C (68°F)

Monitor Period of Emission-related Misfire

Monitor period

Crankshaft 1000 revolutions x 4

Monitor Period of Catalyst-damaging Misfire (MIL Blinks)

Monitor period

Crankshaft 200 revolutions x 3

TYPICAL MALFUNCTION THRESHOLDS

Monitor Period of Emission-related Misfire

Misfire rate

4.0% or higher

Monitor Period of Catalyst-damaging Misfire (MIL Blinks)

Number of misfires per 200 revolutions

108 or more (varies with engine speed and engine load)

CONFIRMATION DRIVING PATTERN

Record the DTC(s) and freeze frame data.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here

HINT:

Do not start the engine.
Using the GTS, change the ECM from normal mode to check mode.
Click here
Start the engine.
Read the misfire counts of each cylinder (Misfire Count Cylinder #1 to Misfire Count Cylinder #4) with the engine idling. If a value is displayed for any misfire count, skip the following confirmation driving pattern.
Drive the Toyota Prius vehicle so that the vehicle conditions displayed in Misfire RPM and Misfire Load of the Data List are the same as the freeze frame data. Perform this step several times.
HINT:

In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, confirm the Misfire RPM and Misfire Load in the Data List.

Engine speed

Duration

Idling

4.5 minutes or more

1000

4.5 minutes or more

2000

2.5 minutes or more

3000

1.5 minutes or more
Check whether misfires have occurred by checking for DTCs and freeze frame data.
HINT:

Do not turn the ignition switch off until the output DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data are cleared.
Record the DTC(s), freeze frame data and misfire counts.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.

WIRING DIAGRAM

Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.
Click here
Refer to Fuel Injector Circuit.
Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem:
1. There was insufficient fuel in the tank.
2. Improper fuel was used.
3. The spark plugs have been contaminated.
4. The problem requires further diagnosis.
After finishing repairs, check the misfire counts of the cylinders (Misfire Count Cylinder #1 to Misfire Count Cylinder #4).
Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after finishing repairs.
When one of Short FT B1S1, Long FT B1S1 in the freeze frame data is outside the range of /-20%, the air fuel ratio may be rich (-20% or less) or lean ( 20% or higher).
When Coolant Temperature in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.
Toyota Prius Vehicle body vibration caused by an extremely imbalanced drive wheel may cause misfire DTCs to be stored.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)

Pre-procedure1

(a) None

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P030000, P030027, P030085, P030100, P030200, P030300 or P030400 and other DTCs are output	A
P030000, P030027, P030085, P030100, P030200, P030300 and P030400 are output	B

HINT:

If any DTCs other than P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output, troubleshoot those DTCs first.

Post-procedure1

GO TO DTC CHART

2.	CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

HINT:

Click here

OK:

PCV valve and hose are correctly connected and are not damaged.

REPAIR OR REPLACE PCV HOSE

3.	READ VALUE USING GTS (MISFIRE RPM AND MISFIRE LOAD)

Pre-procedure1

(a) None

Procedure1

(b) Read and note the Misfire RPM and Misfire Load values.

Powertrain > Engine > Data List

Tester Display
Misfire RPM
Misfire Load

HINT:

The Misfire RPM and Misfire Load values indicate the Toyota Prius vehicle conditions under which the misfire occurred.

Post-procedure1

4.	READ VALUE USING GTS (CATALYST OT MISFIRE FUEL CUT)

Pre-procedure1

(a) None

Procedure1

(b) Read the value displayed on the GTS.

Powertrain > Engine > Data List

Tester Display
Catalyst OT Misfire Fuel Cut

Data List	Result	Proceed to
Catalyst OT Misfire Fuel Cut	Avail	A
Catalyst OT Misfire Fuel Cut	Not Avl	B

Post-procedure1

GO TO STEP 6

5.	PERFORM ACTIVE TEST USING GTS (PROHIBIT THE CATALYST OT MISFIRE PREVENT FUEL CUT)

Pre-procedure1

(a) None

Procedure1

(b) Perform the Active Test.

Powertrain > Engine > Active Test

Tester Display
Prohibit the Catalyst OT Misfire Prevent Fuel Cut

NOTICE:

When performing the Active Test, make sure the Toyota Prius vehicle is stopped and the engine is either idling or being revved within 3000 rpm.

Post-procedure1

6.	READ VALUE USING GTS (MISFIRE COUNT)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and allow the engine to idle.

Procedure1

(c) Read each value for Misfire Count Cylinder #1 to Misfire Count Cylinder #4 displayed on the GTS. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.

Powertrain > Engine > Data List

Tester Display
Misfire Count Cylinder #1
Misfire Count Cylinder #2
Misfire Count Cylinder #3
Misfire Count Cylinder #4

(1) Drive the Toyota Prius vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using GTS (Misfire RPM and Misfire Load)" procedures above [A].

(2) Read the Misfire Count Cylinder #1 to Misfire Count Cylinder #4 or DTCs displayed on the GTS [B].

Result	Proceed to
Most misfires occur in only 1 or 2 cylinders	A
3 cylinders or more have equal misfire counts	B

HINT:

If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find Toyota Prius vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal.
If the freeze frame data record of the engine coolant temperature is less than 75°C (167°F), the misfire may be detected only when the engine is cold.

Post-procedure1

(d) None

GO TO STEP 20

7.	INSPECT SPARK PLUG

(a) Inspect the spark plug of the misfiring cylinder.

Click here

REPLACE SPARK PLUG

8.	CHECK FOR SPARKS (SPARK TEST)

Click here

HINT:

If the result of the spark test is normal, proceed to the next step.
Perform "Inspection After Repair" after repairing or replacing the ignition system.
Click here

9.	CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure of the misfiring cylinder.

Click here

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine assembly.

Click here

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

10.	CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)

Pre-procedure1

(a) Disconnect the ECM connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C53,A91) Click Connector(C53) Click Connector(A91)

Tester Connection	Condition	Specified Condition	Result
C53-34 (#10) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V
C53-35 (#20) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V
C53-36 (#30) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V
C53-37 (#40) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

CHECK FUEL INJECTOR CIRCUIT

11.	CHECK FUEL INJECTOR ASSEMBLY

(a) Check the fuel injector assembly (whether fuel volume is high or low, and whether injection pattern is poor).

Click here

REPLACE FUEL INJECTOR ASSEMBLY

12.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

13.	CHECK FUEL PRESSURE

Click here

GO TO STEP 43

14.	READ VALUE USING GTS (COOLANT TEMPERATURE)

Pre-procedure1

(a) None

Procedure1

(b) Read the Data List twice, when the engine is both cold and warmed up.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Standard:

GTS Display	Condition	Specified Condition
Coolant Temperature	Cold engine	Same as ambient air temperature
Coolant Temperature	Warm engine	Between 75 and 100°C (167 and 212°F)

Post-procedure1

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

15.	READ VALUE USING GTS (INTAKE AIR TEMPERATURE)

Pre-procedure1

(a) None

Procedure1

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
Intake Air Temperature

OK:

Same as actual intake air temperature.

Post-procedure1

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

16.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

(c) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher with with the A/C switch and all accessories off.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

(d) Move the shift lever to P.

Procedure1

(e) Read Mass Air Flow Sensor with the engine speed at 2500 rpm.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor

HINT:

Result	Proceed to
The value of Mass Air Flow Sensor is between 4.5 and 8.5 gm/sec	A
None of the above conditions are met	B

Post-procedure1

(f) None

GO TO STEP 36

17.	CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

Pre-procedure1

(a) Remove the cylinder head cover sub-assembly.

*a	39.5°	*b	Timing Mark
*c	"0" Timing Mark	*d	Groove

(b) Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain or belt cover sub-assembly.

Procedure1

(c) Check that the timing marks of the camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK:

Timing marks on camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

Post-procedure1

(d) None

GO TO STEP 33

18.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 36

19.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

GO TO STEP 36

REPLACE EGR VALVE ASSEMBLY

20.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

21.	CHECK FUEL PRESSURE

Click here

GO TO STEP 43

22.	READ VALUE USING GTS (COOLANT TEMPERATURE)

Pre-procedure1

(a) None

Procedure1

(b) Read the Data List twice, when the engine is both cold and warmed up.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Standard:

GTS Display	Condition	Specified Condition
Coolant Temperature	Cold engine	Same as ambient air temperature
Coolant Temperature	Warm engine	Between 75 and 100°C (167 and 212°F)

Post-procedure1

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

23.	READ VALUE USING GTS (INTAKE AIR TEMPERATURE)

Pre-procedure1

(a) None

Procedure1

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
Intake Air Temperature

OK:

Same as actual intake air temperature.

Post-procedure1

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

24.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

(c) Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher with with the A/C switch and all accessories off.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

(d) Move the shift lever to P.

Procedure1

(e) Read Mass Air Flow Sensor with the engine speed at 2500 rpm.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor

HINT:

Result	Proceed to
The value of Mass Air Flow Sensor is between 4.5 and 8.5 gm/sec	A
None of the above conditions are met	B

Post-procedure1

(f) None

GO TO STEP 36

25.	CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

Pre-procedure1

(a) Remove the cylinder head cover sub-assembly.

*a	39.5°	*b	Timing Mark
*c	"0" Timing Mark	*d	Groove

(b) Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain or belt cover sub-assembly.

Procedure1

(c) Check that the timing marks of the camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK:

Timing marks on camshaft timing gear assembly and camshaft timing sprocket are at the positions shown in the illustration.

HINT:

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

Post-procedure1

(d) None

GO TO STEP 33

26.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 28

27.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

28.	INSPECT SPARK PLUG

(a) Inspect the spark plug of the misfiring cylinder.

Click here

REPLACE SPARK PLUG

29.	CHECK FOR SPARKS (SPARK TEST)

Click here

HINT:

If the result of the spark test is normal, proceed to the next step.
Perform "Inspection After Repair" after repairing or replacing the ignition system.
Click here

30.	CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure of the misfiring cylinder.

Click here

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine assembly.

Click here

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

31.	CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)

Pre-procedure1

(a) Disconnect the ECM connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C53,A91) Click Connector(C53) Click Connector(A91)

Tester Connection	Condition	Specified Condition	Result
C53-34 (#10) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V
C53-35 (#20) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V
C53-36 (#30) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V
C53-37 (#40) - A91-15 (E01)	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

CHECK FUEL INJECTOR CIRCUIT

32.	CHECK FUEL INJECTOR ASSEMBLY

(a) Check the fuel injector assembly (whether fuel volume is high or low, and whether injection pattern is poor).

Click here

GO TO STEP 36

REPLACE FUEL INJECTOR ASSEMBLY

33.	CHECK ENGINE MECHANICAL SYSTEM

(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine mechanical system.

Click here

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

34.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

35.	CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Check the DTC judgment result.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 is output)

Post-procedure1

(d) None

CHECK FOR INTERMITTENT PROBLEMS

36.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

HINT:

Click here
Repair any problems.

37.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

38.	CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Check the DTC judgment result.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 is output)

Post-procedure1

(d) None

END

39.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C27,C53) Click Connector(C27) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C27-4 (VCC) - C53-108 (VCVG)	Always	Below 1 Ω	Ω
C27-3 (FG) - C53-140 (VG)	Always	Below 1 Ω	Ω
C27-2 (E2G) - C53-107 (E2G)	Always	Below 1 Ω	Ω
C27-4 (VCC) or C53-108 (VCVG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C27-3 (FG) or C53-140 (VG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C27-2 (E2G) or C53-107 (E2G) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

40.	REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

Click here
If the results of the inspections performed in steps 16 and 24 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

41.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

42.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300 or P030400.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 is output)

Post-procedure1

(d) None

END

REPLACE ECM

43.	INSPECT FUEL PUMP

Click here

REPAIR OR REPLACE FUEL LINE

REPLACE FUEL PUMP

Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511)

DESCRIPTION

A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 and 23 kHz.

The knock control sensor is installed to the engine block to detect engine knocking.

The knock control sensor contains a piezoelectric element which generates a voltage when it becomes deformed.

The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

HINT:

When DTC P032511 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P032511	Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground	The knock control sensor output voltage is less than 0.5 V for 1 second or more (1 trip detection logic).	Short in knock control sensor circuit Knock control sensor ECM	Comes on	Engine	A	SAE Code: P0327

Reference: Inspection using an oscilloscope

HINT:

The correct waveform is as shown.

ECM Terminal Name	Between KNK1 and EKNK
Tester Range	1 V/DIV., 1 ms./DIV.
Condition	Engine speed maintained at 2500 rpm after warming up engine

MONITOR DESCRIPTION

If the output voltage transmitted by the knock control sensor remains low for 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 5 minutes.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P032511.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)

Pre-procedure1

(a) Disconnect the knock control sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(D1) Click Connector(D1)

Tester Connection	Condition	Specified Condition	Result
D1-2 (KNK1) - D1-1 (EKNK)	Ignition switch ON	4.5 to 5.5 V	V

Post-procedure1

(d) None

GO TO STEP 3

2.	INSPECT KNOCK CONTROL SENSOR

Click here

GO TO STEP 4

REPLACE KNOCK CONTROL SENSOR

3.	CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)

Pre-procedure1

(a) Disconnect the knock control sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(D1,C53) Click Connector(D1) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
D1-2 (KNK1) or C53-92 (KNK1) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

5.	CHECK WHETHER DTC OUTPUT RECURS (DTC P032511)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P032511 is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Battery or Open (P032515)

DESCRIPTION

Refer to DTC P032511.

Click here

HINT:

When DTC P032515 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P032515	Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Battery or Open	The knock control sensor output voltage is higher than 4.5 V for 1 second or more (1 trip detection logic).	Open or short in knock control sensor circuit Knock control sensor ECM	Comes on	Engine	A	SAE Code: P0328

Reference: Inspection using an oscilloscope.

Click here

MONITOR DESCRIPTION

If the output voltage transmitted by the knock control sensor remains high for 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 5 minutes.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P032515.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P032511.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)

Pre-procedure1

(a) Disconnect the knock control sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(D1) Click Connector(D1)

Tester Connection	Condition	Specified Condition	Result
D1-2 (KNK1) - D1-1 (EKNK)	Ignition switch ON	4.5 to 5.5 V	V

Post-procedure1

(d) None

GO TO STEP 3

2.	INSPECT KNOCK CONTROL SENSOR

Click here

GO TO STEP 4

REPLACE KNOCK CONTROL SENSOR

3.	CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)

Pre-procedure1

(a) Disconnect the knock control sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(D1,C53) Click Connector(D1) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
D1-2 (KNK1) - C53-92 (KNK1)	Always	Below 1 Ω	Ω
D1-1 (EKNK) - C53-91 (EKNK)	Always	Below 1 Ω	Ω
D1-2 (KNK1) or C53-92 (KNK1) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

5.	CHECK WHETHER DTC OUTPUT RECURS (DTC P032515)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P032515 is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Crankshaft Position Sensor "A" Circuit Short to Ground (P033511)

DESCRIPTION

The crankshaft position sensor system consists of a crankshaft position sensor plate and Magneto Resistance Element (MRE) type sensor. The crankshaft position sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed on the crankshaft. The crankshaft position sensor generates 34 signals per crankshaft revolution. The ECM uses the crankshaft position sensor signal (NE signal) to detect the crankshaft position and engine speed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P033511

Crankshaft Position Sensor "A" Circuit Short to Ground

Diagnosis condition:

Ignition switch ON

Abnormal condition:

The crankshaft position sensor output voltage is less than 0.3 V.

Malfunction time:

4 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Crankshaft position sensor

Sensors/components used for detection (Related):

Camshaft position sensor

Short in crankshaft position sensor circuit
Crankshaft position sensor
ECM

Comes on

Engine

SAE Code: P0337

Reference: Inspection using an oscilloscope.
HINT:

The correct waveform is as shown.

ECM Terminal Name

Between NE and NE-

Tester Range

2 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the crankshaft position sensor is less than 0.3 V for 4 seconds or more, the ECM determines that the crankshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Crankshaft position sensor
Required Sensors/Components (Related)	Camshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

The engine speed can be checked by using the GTS. To perform the check, follow the procedures below:

Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
Start the engine.

The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	CHECK DTC OUTPUT (DTC P033511 OR P033515)

Pre-procedure1

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the crankshaft position sensor connector.

(b) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

Powertrain > Engine > Trouble Codes

HINT:

When the ECM, wire harnesses and connectors are normal, DTC P033515 will be stored when the connector of the sensor is disconnected.

Result	Proceed to
P033515 is output	A
P033511 is output	B

Post-procedure1

(d) None

REPLACE CRANKSHAFT POSITION SENSOR

3.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-3 (NE ) or C53-80 (NE ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C19-2 (NE-) or C53-81 (NE-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Crankshaft Position Sensor "A" Circuit Short to Battery or Open (P033515)

DESCRIPTION

Refer to DTC P033511.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P033515

Crankshaft Position Sensor "A" Circuit Short to Battery or Open

Diagnosis condition:

Ignition switch ON

Abnormal condition:

The crankshaft position sensor output voltage is higher than 4.7 V.

Malfunction time:

4 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Crankshaft position sensor

Sensors/components used for detection (Related):

Camshaft position sensor

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
ECM

Comes on

Engine

SAE Code: P0338

Reference: Inspection using an oscilloscope.
Click here

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the crankshaft position sensor is higher than 4.7 V for 4 seconds or more, the ECM determines that the crankshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Crankshaft position sensor
Required Sensors/Components (Related)	Camshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Refer to DTC P033511.

Click here

WIRING DIAGRAM

Refer to DTC P033511.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

The engine speed can be checked by using the GTS. To perform the check, follow the procedures below:

Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
Start the engine.

The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (CRANKSHAFT POSITION SENSOR)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition
C19-1 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V

Result	Proceed to
Higher than 5.5 V	A
4.5 to 5.5 V	B
Below 4.5 V	C

Post-procedure1

(d) None

GO TO STEP 3

GO TO STEP 10

2.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) or C53-82 (VCNE) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK TERMINAL VOLTAGE (CRANKSHAFT POSITION SENSOR)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition
C19-3 (NE ) - Body ground	Ignition switch ON	3.0 to 5.0 V

Result	Proceed to
Higher than 5.0 V	A
3.0 to 5.0 V	B
Below 3.0 V	C

Post-procedure1

(d) None

GO TO STEP 5

GO TO STEP 9

4.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-3 (NE ) or C53-80 (NE ) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - BODY GROUND)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition	Result
C19-2 (NE-) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

GO TO STEP 8

6.	CHECK INTERNAL RESISTANCE (ECM)

Pre-procedure1

(a) Turn the ignition switch off.

(b) Disconnect the crankshaft position sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - C19-3 (NE )	Ignition switch off	1.425 to 1.575 kΩ	kΩ

HINT:

As voltage is still supplied to the ECM after the ignition switch is turned off, this check cannot be performed correctly during the shut-down process.

Post-procedure1

(d) None

REPLACE CRANKSHAFT POSITION SENSOR

7.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - C19-3 (NE ) or C53-82 (VCNE) - C53-80 (NE )	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-2 (NE-) - C53-81 (NE-)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-3 (NE ) - C53-80 (NE )	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - C53-82 (VCNE)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Crankshaft Position Sensor "A" Signal Stuck in Range (P03352A)

DESCRIPTION

Refer to DTC P033511.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P03352A

Crankshaft Position Sensor "A" Signal Stuck in Range

Diagnosis condition:

Engine running

Abnormal condition:

No crankshaft position sensor signal.

Malfunction time:

4.7 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Crankshaft position sensor

Sensors/components used for detection (Related):

Camshaft position sensor

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
ECM

Comes on

Engine

SAE Code: P0335

Reference: Inspection using an oscilloscope.
Click here

MONITOR DESCRIPTION

When the engine is cranking and no crankshaft position sensor signal is received for 4.7 seconds or more, the ECM determines that the crankshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Crankshaft position sensor
Required Sensors/Components (Related)	Camshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Start the engine [A].
Idle the engine for 20 seconds or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [A] through [C] again.

WIRING DIAGRAM

Refer to DTC P033511.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical section.
The engine speed can be checked by using the GTS. To perform the check, follow the procedures below:
1. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
2. Start the engine.
- The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.

PROCEDURE

1.	CHECK TERMINAL VOLTAGE AND INTERNAL RESISTANCE (CRANKSHAFT POSITION SENSOR AND ECM)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V	V
C19-3 (NE ) - Body ground	Ignition switch ON	3.0 to 5.0 V	V

Post-procedure1

(d) Turn the ignition switch off.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition	Result
C19-2 (NE-) - Body ground	Ignition switch off	Below 1 Ω	Ω

Post-procedure2

(g) None

GO TO STEP 4

2.	INSPECT CRANKSHAFT POSITION SENSOR

Pre-procedure1

(a) Remove the crankshaft position sensor.

HINT:

Click here

Procedure1

(b) Confirm that there is no oil on the connecting parts of the crankshaft position sensor connector.

OK:

There is no oil on the connecting parts of the crankshaft position sensor connector

Post-procedure1

REPLACE CRANKSHAFT POSITION SENSOR

3.	INSPECT CRANKSHAFT POSITION SENSOR

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

*a	Component without harness connected (Crankshaft Position Sensor)

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (VC) - 3 (NE )	Always	10 kΩ or higher	kΩ
1 (VC) - 2 (NE-)	Always	10 kΩ or higher	kΩ
3 (NE ) - 2 (NE-)	Always	10 kΩ or higher	kΩ

Post-procedure1

REPLACE ECM

REPLACE CRANKSHAFT POSITION SENSOR

4.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - C53-82 (VCNE)	Always	Below 1 Ω	Ω
C19-3 (NE ) - C53-80 (NE )	Always	Below 1 Ω	Ω
C19-2 (NE-) - C53-81 (NE-)	Always	Below 1 Ω	Ω
C19-1 (VC) or C53-82 (VCNE) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C19-3 (NE ) or C53-80 (NE ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C19-2 (NE-) or C53-81 (NE-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Crankshaft Position Sensor "A" No Signal (P033531)

DESCRIPTION

Refer to DTC P033511.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P033531

Crankshaft Position Sensor "A" No Signal

Diagnosis condition:

3 seconds or more have elapsed after the engine started

Abnormal condition:

The engine stalls and the engine speed signal value decreases rapidly.

Malfunction time:

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Crankshaft position sensor

Sensors/components used for detection (Related):

Camshaft position sensor

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
ECM

Comes on

Engine

SAE Code: P0335

Reference: Inspection using an oscilloscope.
Click here

MONITOR DESCRIPTION

When the engine speed fluctuates abnormally during engine stall judgement, the ECM determines that the crankshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.(Under normal circumstances, the engine speed gradually decreases.)

MONITOR STRATEGY

Required Sensors/Components (Main)	Crankshaft position sensor
Required Sensors/Components (Related)	Camshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Refer to DTC P03352A.

Click here

WIRING DIAGRAM

Refer to DTC P033511.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical section.
The engine speed can be checked by using the GTS. To perform the check, follow the procedures below:
1. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.
2. Start the engine.
- The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.

PROCEDURE

1.	CHECK DTC OUTPUT (DTC P033531 AND P033511 OR P033515)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P033531 and P033511 are output	A
P033531 and P033515 are output	B
P033531 is output	C

HINT:

If DTC P033511 or P033515 is output, perform troubleshooting for it first.

GO TO DTC CHART

2.	CHECK TERMINAL VOLTAGE AND INTERNAL RESISTANCE (CRANKSHAFT POSITION SENSOR AND ECM)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V	V
C19-3 (NE ) - Body ground	Ignition switch ON	3.0 to 5.0 V	V

Post-procedure1

(d) Turn the ignition switch off.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C19) Click Connector(C19)

Tester Connection	Condition	Specified Condition	Result
C19-2 (NE-) - Body ground	Ignition switch off	Below 1 Ω	Ω

Post-procedure2

(g) None

GO TO STEP 5

3.	INSPECT CRANKSHAFT POSITION SENSOR

Pre-procedure1

(a) Remove the crankshaft position sensor.

HINT:

Click here

Procedure1

(b) Confirm that there is no oil on the connecting parts of the crankshaft position sensor connector.

OK:

There is no oil on the connecting parts of the crankshaft position sensor connector

Post-procedure1

REPLACE CRANKSHAFT POSITION SENSOR

4.	INSPECT CRANKSHAFT POSITION SENSOR

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

*a	Component without harness connected (Crankshaft Position Sensor)

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (VC) - 3 (NE )	Always	10 kΩ or higher	kΩ
1 (VC) - 2 (NE-)	Always	10 kΩ or higher	kΩ
3 (NE ) - 2 (NE-)	Always	10 kΩ or higher	kΩ

Post-procedure1

REPLACE ECM

REPLACE CRANKSHAFT POSITION SENSOR

5.	CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the crankshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C19,C53) Click Connector(C19) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C19-1 (VC) - C53-82 (VCNE)	Always	Below 1 Ω	Ω
C19-3 (NE ) - C53-80 (NE )	Always	Below 1 Ω	Ω
C19-2 (NE-) - C53-81 (NE-)	Always	Below 1 Ω	Ω
C19-1 (VC) or C53-82 (VCNE) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C19-3 (NE ) or C53-80 (NE ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C19-2 (NE-) or C53-81 (NE-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground (P034011)

DESCRIPTION

The camshaft position sensor (VV1 signal) consists of a magnet and MRE (Magneto Resistance Element).

The intake camshaft has a timing rotor for the camshaft position sensor. When the intake camshaft rotates, changes occur in the air gaps between the timing rotor and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The camshaft position sensor converts the camshaft rotation data to pulse signals, uses the pulse signals. The ECM uses the pulse signals to determine the camshaft angle. Then the ECM uses this data to control fuel injection duration and injection timing.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P034011

Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground

Diagnosis condition:

2 seconds or more have elapsed after the ignition switch is turned ON.

Abnormal condition:

The camshaft position sensor output voltage is less than 0.3 V.

Malfunction time:

4 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Camshaft position sensor

Sensors/components used for detection (Related):

Crankshaft position sensor

Short in camshaft position sensor circuit
Camshaft position sensor
ECM

Comes on

Engine

SAE Code: P0342

Reference: Inspection using an oscilloscope.
HINT:
- The correct waveform is as shown.
- VV1 represents the camshaft position sensor signal.
ECM Terminal Name

Between VV1 and VV1-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

MONITOR DESCRIPTION

2 seconds or more after the ignition switch has been turned ON, if the output voltage of the camshaft position sensor is less than 0.3 V for 4 seconds or more, the ECM determines that the camshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait for 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	CHECK DTC OUTPUT (DTC P034011 OR P034015)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

Powertrain > Engine > Trouble Codes

HINT:

When the ECM, wire harnesses and connectors are normal, DTC P034015 will be stored when the connector of the sensor is disconnected.

Result	Proceed to
P034015 is output	A
P034011 is output	B

Post-procedure1

(d) None

REPLACE CAMSHAFT POSITION SENSOR

3.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-1 (VVI ) or C53-110 (VV1 ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C18-2 (VVI-) or C53-113 (VV1-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Battery or Open (P034015)

DESCRIPTION

Refer to DTC P034011.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P034015

Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Battery or Open

Diagnosis condition:

2 seconds or more have elapsed after the ignition switch is turned ON.

Abnormal condition:

The camshaft position sensor output voltage is higher than 4.7 V.

Malfunction time:

4 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Camshaft position sensor

Sensors/components used for detection (Related):

Crankshaft position sensor

Open or short in camshaft position sensor circuit
Camshaft position sensor
ECM

Comes on

Engine

SAE Code: P0343

Reference: Inspection using an oscilloscope.
Click here

MONITOR DESCRIPTION

2 seconds or more after the ignition switch has been turned ON, if the output voltage of the camshaft position sensor is higher than 4.7 V for 4 seconds or more, the ECM determines that the camshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Refer to DTC P034011.

Click here

WIRING DIAGRAM

Refer to DTC P034011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (CAMSHAFT POSITION SENSOR)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition
C18-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V

Result	Proceed to
Higher than 5.5 V	A
4.5 to 5.5 V	B
Below 4.5 V	C

Post-procedure1

(d) None

GO TO STEP 3

GO TO STEP 10

2.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) or C53-114 (VCV1) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK TERMINAL VOLTAGE (CAMSHAFT POSITION SENSOR)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition
C18-1 (VVI ) - Body ground	Ignition switch ON	3.0 to 5.0 V

Result	Proceed to
Higher than 5.0 V	A
3.0 to 5.0 V	B
Below 3.0 V	C

Post-procedure1

(d) None

GO TO STEP 5

GO TO STEP 9

4.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-1 (VVI ) or C53-110 (VV1 ) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - BODY GROUND)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition	Result
C18-2 (VVI-) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

GO TO STEP 8

6.	CHECK INTERNAL RESISTANCE (ECM)

Pre-procedure1

(a) Turn the ignition switch off.

(b) Disconnect the camshaft position sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - C18-1 (VVI )	Ignition switch off	1.425 to 1.575 kΩ	kΩ

HINT:

As voltage is still supplied to the ECM after the ignition switch is turned off, this check cannot be performed correctly during the shut-down process.

Post-procedure1

(d) None

REPLACE CAMSHAFT POSITION SENSOR

7.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - C18-1 (VVI ) or C53-114 (VCV1) - C53-110 (VV1 )	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-2 (VVI-) - C53-113 (VV1-)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-1 (VVI ) - C53-110 (VV1 )	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - C53-114 (VCV1)	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Camshaft Position Sensor "A" Bank 1 or Single Sensor Signal Stuck in Range (P03402A)

DESCRIPTION

Refer to DTC P034011.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P03402A

Camshaft Position Sensor "A" Bank 1 or Single Sensor Signal Stuck in Range

Diagnosis condition:

Engine cranking

Abnormal condition:

No camshaft position sensor signal.

Malfunction time:

2 times

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Camshaft position sensor

Sensors/components used for detection (Related):

Crankshaft position sensor

Open or short in camshaft position sensor circuit
Camshaft position sensor
ECM

Comes on

Engine

SAE Code: P0340

Reference: Inspection using an oscilloscope.
Click here

MONITOR DESCRIPTION

When the engine is cranking and no camshaft position sensor signal is received for 2 times, the ECM determines that the camshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
Idle the engine for 10 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P034011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.

PROCEDURE

1.	CHECK TERMINAL VOLTAGE AND INTERNAL RESISTANCE (CAMSHAFT POSITION SENSOR AND ECM)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V	V
C18-1 (VVI ) - Body ground	Ignition switch ON	3.0 to 5.0 V	V

Post-procedure1

(d) Turn the ignition switch off.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition	Result
C18-2 (VVI-) - Body ground	Ignitionr switch off	Below 1 Ω	Ω

Post-procedure2

(g) None

GO TO STEP 4

2.	INSPECT CAMSHAFT POSITION SENSOR

Pre-procedure1

(a) Remove the camshaft position sensor.

HINT:

Click here

Procedure1

(b) Confirm that there is no oil on the connecting parts of the camshaft position sensor connector.

OK:

There is no oil on the connecting parts of the camshaft position sensor connector.

Post-procedure1

REPLACE CAMSHAFT POSITION SENSOR

3.	INSPECT CAMSHAFT POSITION SENSOR

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

*a	Component without harness connected (Camshaft Position Sensor)

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
3 (VC) - 1 (VVI )	Always	10 kΩ or higher	kΩ
3 (VC) - 2 (VVI-)	Always	10 kΩ or higher	kΩ
1 (VVI ) - 2 (VVI-)	Always	10 kΩ or higher	kΩ

Post-procedure1

REPLACE ECM

REPLACE CAMSHAFT POSITION SENSOR

4.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - C53-114 (VCV1)	Always	Below 1 Ω	Ω
C18-1 (VVI ) - C53-110 (VV1 )	Always	Below 1 Ω	Ω
C18-2 (VVI-) - C53-113 (VV1-)	Always	Below 1 Ω	Ω
C18-3 (VC) or C53-114 (VCV1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C18-1 (VVI ) or C53-110 (VV1 ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C18-2 (VVI-) or C53-113 (VV1-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Camshaft Position Sensor "A" Bank 1 or Single Sensor No Signal (P034031)

DESCRIPTION

Refer to DTC P034011.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P034031

Camshaft Position Sensor "A" Bank 1 or Single Sensor No Signal

Diagnosis condition:

The engine is running (600 rpm or more)

Abnormal condition:

No camshaft position sensor signal.

Malfunction time:

5 seconds or more

Trip logic:

1 trip detection logic

Detection conditions:

Continuous

Sensors/components used for detection (Main):

Camshaft position sensor

Sensors/components used for detection (Related):

Crankshaft position sensor

Open or short in camshaft position sensor circuit
Camshaft position sensor
ECM

Comes on

Engine

SAE Code: P0340

Reference: Inspection using an oscilloscope.
Click here

MONITOR DESCRIPTION

When the engine is running and no camshaft position sensor signal is received for 5 seconds or more, the ECM determines that the camshaft position sensor circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Refer to DTC P03402A.

Click here

WIRING DIAGRAM

Refer to DTC P034011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.

PROCEDURE

1.	CHECK DTC OUTPUT (DTC P034031 AND P034011 OR P034015)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P034031 and P034011 are output	A
P034031 and P034015 are output	B
P034031 is output	C

HINT:

If DTC P034011 or P034015 is output, perform troubleshooting for it first.

GO TO DTC CHART

2.	CHECK TERMINAL VOLTAGE AND INTERNAL RESISTANCE (CAMSHAFT POSITION SENSOR AND ECM)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V	V
C18-1 (VVI ) - Body ground	Ignition switch ON	3.0 to 5.0 V	V

Post-procedure1

(d) Turn the ignition switch off.

Pre-procedure2

(e) None

Procedure2

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C18) Click Connector(C18)

Tester Connection	Condition	Specified Condition	Result
C18-2 (VVI-) - Body ground	Ignition switch off	Below 1 Ω	Ω

Post-procedure2

(g) None

GO TO STEP 5

3.	INSPECT CAMSHAFT POSITION SENSOR

Pre-procedure1

(a) Remove the camshaft position sensor.

HINT:

Click here

Procedure1

(b) Confirm that there is no oil on the connecting parts of the camshaft position sensor connector.

OK:

There is no oil on the connecting parts of the camshaft position sensor connector.

Post-procedure1

REPLACE CAMSHAFT POSITION SENSOR

4.	INSPECT CAMSHAFT POSITION SENSOR

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

*a	Component without harness connected (Camshaft Position Sensor)

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
3 (VC) - 1 (VVI )	Always	10 kΩ or higher	kΩ
3 (VC) - 2 (VVI-)	Always	10 kΩ or higher	kΩ
1 (VVI ) - 2 (VVI-)	Always	10 kΩ or higher	kΩ

Post-procedure1

REPLACE ECM

REPLACE CAMSHAFT POSITION SENSOR

5.	CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C18,C53) Click Connector(C18) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C18-3 (VC) - C53-114 (VCV1)	Always	Below 1 Ω	Ω
C18-1 (VVI ) - C53-110 (VV1 )	Always	Below 1 Ω	Ω
C18-2 (VVI-) - C53-113 (VV1-)	Always	Below 1 Ω	Ω
C18-3 (VC) or C53-114 (VCV1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C18-1 (VVI ) or C53-110 (VV1 ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C18-2 (VVI-) or C53-113 (VV1-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Exhaust Gas Recirculation "A" Low / Insufficient Flow (P04019C)

DESCRIPTION

Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to each engine cylinder in order to lower the combustion temperature and reduce NOx emissions. The ECM monitors signals such as engine speed, engine coolant temperature, electric load, and Toyota Prius vehicle speed. When the EGR permission conditions are met, the ECM controls the opening of the EGR valve linearly through signals to the EGR step motor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P04019C	Exhaust Gas Recirculation "A" Low / Insufficient Flow	Change in intake manifold pressure is small when the EGR valve opened and closed during fuel cut operation (2 trip detection logic).	EGR valve assembly EGR passage EGR pipe with cooler sub-assembly Intake system Manifold absolute pressure sensor	Comes on	Engine	B	SAE Code: P0401

MONITOR DESCRIPTION

The ECM monitors the pressure inside the intake manifold while opening and closing the EGR valve during fuel cut operation. If there is no change in the manifold absolute pressure sensor value, the ECM interprets this as a malfunction of the EGR valve assembly, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)

EGR valve assembly

Manifold absolute pressure sensor

Required Sensors/Components (Related)

Engine coolant temperature sensor

Frequency of Operation

Once per driving cycle

TYPICAL ENABLING CONDITIONS

Engine speed	950 to 1600 rpm
Toyota Prius Vehicle speed	32 km/h (20 mph) or more
Intake air temperature	-10°C (14°F) or higher

TYPICAL MALFUNCTION THRESHOLDS

Manifold pressure change	Less than 1.72 kPa [0.25 psi]
At engine speed	1050 rpm

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
With the engine running, accelerate the Toyota Prius vehicle to 65 km/h (40 mph) or more by depressing the accelerator pedal for at least 10 seconds or more [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

When accelerating the vehicle, depress the accelerator pedal more than normal to start the engine.
Idle the engine for 30 seconds or more [C].
With brake (B) selected and the engine running, accelerate the Toyota Prius vehicle to 65 km/h (40 mph) or more [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Perform the fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E].
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC P04019C.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the DTC judgment result is INCOMPLETE, perform steps [D] and [E].

WIRING DIAGRAM

Refer to the DTC P040314.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
If the EGR valve is normal and is opened using the Active Test, the Data List value changes as follows.

Data List Item

Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test

Intake Manifold Absolute Pressure

Pressure rises

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P04019C)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P04019C and other DTCs are output	A
P04019C is output	B

HINT:

If any DTCs other than P04019C are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	READ VALUE USING GTS (INTAKE MANIFOLD ABSOLUTE PRESSURE)

Pre-procedure1

(a) None

Procedure1

(b) Read the value of Intake Manifold Absolute Pressure.

Powertrain > Engine > Data List

Tester Display
Intake Manifold Absolute Pressure

Result	Proceed to
The value of Intake Manifold Absolute Pressure is between 80 and 110 kPa(abs)	A
None of the above conditions are met	B

HINT:

80 to 110 kPa(abs) = 11.6 to 15.95 psi(abs)

Post-procedure1

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

3.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) According to the display on the GTS, compare the values of Data List item Intake Manifold Absolute Pressure before and while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

Standard:

The value of Intake Manifold Absolute Pressure changes according to the EGR valve step set by the Active Test.

Data List

Control the EGR Step Position (Active Test)

Before Active Test

(Engine idling)

0 Steps

0 to 30 Steps

(Engine idling)

Intake Manifold Absolute Pressure

20 to 40 kPa (2.9 to 5.8 psi)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result	Proceed to
Before performing the Active Test (while the engine is idling), the value of Intake Manifold Absolute Pressure is not between 20 to 40 kPa (2.9 to 5.8 psi).	A
When performing the Active Test to change the EGR valve step between 0 (EGR valve fully closed) and 30, the value of Intake Manifold Absolute Pressure changes less than 10 kPa (1.42 psi).	B
Other than above	C

Post-procedure1

(d) None

GO TO STEP 6

GO TO STEP 12

4.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

5.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

REPLACE EGR VALVE ASSEMBLY

6.	REPLACE EGR VALVE ASSEMBLY

HINT:

Click here

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

8.	CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P04019C is output	B

Post-procedure1

END

9.	REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLY

HINT:

Click here
If any of the EGR system related pipes (EGR pipe, exhaust manifold, etc.) are cracked, damaged or clogged, replace them as necessary.
Perform "Inspection After Repair" after replacing the EGR system.
Click here

10.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

11.	CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

OK:

DTCs are not output.

Post-procedure1

END

12.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

13.	CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P04019C is output	B

Post-procedure1

END

REPLACE EGR VALVE ASSEMBLY

Exhaust Gas Recirculation "A" Control Circuit 1 Open (P040314,P140000,P140596,P141004)

DESCRIPTION

Refer to DTC P04019C.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P040314	Exhaust Gas Recirculation "A" Control Circuit 1 Open	Open or short in EGR1 circuit for 1 second or more (1 trip detection logic).	Open or short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	Engine	A	SAE Code: P0403
P140000	Exhaust Gas Recirculation "A" Control Circuit 2 Open	Open or short in EGR2 circuit for 1 second or more (1 trip detection logic).	Open or short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	Engine	A	SAE Code: P0403
P140596	Exhaust Gas Recirculation "A" Control Circuit 3 Open	Open or short in EGR3 circuit for 1 second or more (1 trip detection logic).	Open or short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	Engine	A	SAE Code: P0403
P141004	Exhaust Gas Recirculation "A" Control Circuit 4 Open	Open or short in EGR4 circuit for 1 second or more (1 trip detection logic).	Open or short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	Engine	A	SAE Code: P0403

MONITOR DESCRIPTION

These DTCs are stored if an open or short in the EGR valve assembly circuit is detected.

Example:

If the EGR1, EGR2, EGR3 or EGR4 terminal output voltage is excessively low, but the step motor is still operating, the ECM determines that there is a short in the EGR valve assembly circuit, illuminate the MIL and stores a DTC.
If the EGR1, EGR2, EGR3 or EGR4 terminal output voltage is excessively low, and the step motor is not operating, the ECM determines that there is an open in the EGR valve assembly circuit, illuminate the MIL and stores a DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up [B].
With the engine running, drive the Toyota Prius vehicle at 20 km/h (12 mph) or more for 10 minutes or more [C].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P040314, P140000, P140596 or P141004.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

CHECK FOR INTERMITTENT PROBLEMS

2.	INSPECT EGR VALVE ASSEMBLY

Click here

REPLACE EGR VALVE ASSEMBLY

3.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EGR VALVE ASSEMBLY)

Pre-procedure1

(a) Disconnect the EGR valve assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C43) Click Connector(C43)

Tester Connection	Condition	Specified Condition	Result
C43-2 ( B1) - Body ground	Ignition switch ON	11 to 14 V	V
C43-5 ( B2) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

GO TO STEP 5

4.	CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the EGR valve assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C43,C53) Click Connector(C43) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C43-4 (EGR1) - C53-45 (EGR1)	Always	Below 1 Ω	Ω
C43-3 (EGR2) - C53-43 (EGR2)	Always	Below 1 Ω	Ω
C43-6 (EGR3) - C53-44 (EGR3)	Always	Below 1 Ω	Ω
C43-1 (EGR4) - C53-42 (EGR4)	Always	Below 1 Ω	Ω
C43-4 (EGR1) or C53-45 (EGR1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C43-3 (EGR2) or C53-43 (EGR2) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C43-6 (EGR3) or C53-44 (EGR3) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C43-1 (EGR4) or C53-42 (EGR4) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT EFI-MAIN NO. 1 RELAY

Click here

REPLACE EFI-MAIN NO. 1 RELAY

6.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition	Result
3 (EFI-MAIN NO. 1 relay) - Body ground	Always	11 to 14 V	V
1 (EFI-MAIN NO. 1 relay) - Body ground	Always	11 to 14 V	V

Post-procedure1

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 1 RELAY)

Catalyst System Efficiency Below Threshold Bank 1 (P042000)

MONITOR DESCRIPTION

The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency.

The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.

In order to detect any deterioration in the three-way catalytic converter, the ECM calculates the oxygen storage capacity of the three-way catalytic converter. This calculation is based on the output voltage of the heated oxygen sensor while performing active air fuel ratio control.

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the Toyota Prius vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 30 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the cycle of the waveform for the heated oxygen sensor is long, the oxygen storage capacity is great. There is a direct correlation between the heated oxygen sensor and the oxygen storage capacity of the three-way catalytic converter.

The ECM uses the oxygen storage capacity value to determine the state of the three-way catalytic converter. If any deterioration has occurred, the ECM will illuminate the MIL and store a DTC.

This system determines the deterioration of the entire catalyst system (including the front and rear catalysts), by using the oxygen storage capacity value of the front catalyst, that is more sensitive than the rear catalyst, as the representative value. Therefore, be sure to replace the front and rear catalysts together when catalyst replacement is necessary.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P042000	Catalyst System Efficiency Below Threshold Bank 1	The oxygen storage capacity value is less than the standard value under active air fuel ratio control (2 trip detection logic).	Gas leak from exhaust system Air fuel ratio sensor (sensor 1) Heated oxygen sensor (sensor 2) Exhaust manifold (TWC: Front catalyst) Front exhaust pipe assembly (TWC: Rear catalyst) EGR valve assembly	Comes on	Engine	B	SAE Code: P0420

CATALYST LOCATION

*1	Air Fuel Ratio Sensor (Sensor 1)	*2	Heated Oxygen Sensor (Sensor 2)
*3	Exhaust Manifold	*4	Front Exhaust Pipe Assembly
*5	Tail Exhaust Pipe Assembly	*6	TWC: Front Catalyst
*7	TWC: Rear Catalyst	-	-

NOTICE:

When replacing the exhaust manifold (*3) and the front exhaust pipe assembly (*4) in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor (*1) and the heated oxygen sensor (*2).

MONITOR STRATEGY

Required Sensors/Components (Main)

Air fuel ratio sensor

Heated oxygen sensor

Required Sensors/Components (Related)

Intake air temperature sensor

Mass air flow meter sub-assembly

Crankshaft position sensor

Engine coolant temperature sensor

Frequency of Operation

Once per driving cycle

TYPICAL ENABLING CONDITIONS

Auxiliary battery voltage	11 V or higher
Intake air temperature	-10°C (14°F) or higher
Engine coolant temperature	75°C (167°F) or higher
Atmospheric pressure	76 kPa(abs) [11 psi(abs)] or higher
Idling	Off
Engine speed	Less than 4000 rpm
Air fuel ratio sensor status	Activated
Fuel system status	Closed loop
Engine load	10% or higher, and less than 70%
All of the following conditions are met	-
Mass air flow rate	7 gm/sec or more, and less than 30 gm/sec
Front catalyst temperature (estimated)	520°C (968°F) or higher, and less than 710°C (1310°F)
Rear catalyst temperature (estimated)	330°C (626°F) or higher, and less than 700°C (1292°F)

CONFIRMATION DRIVING PATTERN

HINT:

It is necessary for the response of the heated oxygen sensor to be normal in order to confirm DTC P042000. Therefore, perform the confirmation driving pattern for the heated oxygen sensor monitor before performing the confirmation driving pattern for the catalyst efficiency monitor.
Performing this confirmation driving pattern will activate the catalyst efficiency monitor. This is very useful for verifying the completion of a repair.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with park (P) selected [A].
HINT:

In order to keep the idle stable, turn the A/C and all other electric loads off and do not perform any shift operations.
With the engine running, drive the Toyota Prius vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- Drive the vehicle while keeping the engine load as constant as possible.
- If the engine stops, further depress the accelerator pedal to restart the engine.
Turn the ignition switch off and wait for at least 30 seconds [C].
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [D].
With the engine running, drive the Toyota Prius vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [E].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- Drive the vehicle while keeping the engine load as constant as possible.
- If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P042000.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE and no pending DTC is output, perform the following procedure.
Drive the Toyota Prius vehicle at 100 km/h (63 mph) for 10 minutes or more [G].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- Drive the vehicle while keeping the engine load as constant as possible.
- If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [H].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P042000.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If a malfunction cannot be found when troubleshooting DTC P042000, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P017100 (System Too Lean) and P017200 (System Too Rich).
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P042000)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P042000 and other DTCs are output	A
P042000 is output	B

HINT:

If any DTCs other than P042000 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
The air fuel ratio sensor is displayed as A/F (O2) Sensor Current B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the GTS.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

GTS Display (Sensor)	Injection Volume	Status	Voltage
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	12.5%	Rich	Below -0.075 mA
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	-12.5%	Lean	Higher than 0.037 mA
O2 Sensor Voltage B1S2 (Heated oxygen)	12.5%	Rich	Higher than 0.55 V
O2 Sensor Voltage B1S2 (Heated oxygen)	-12.5%	Lean	Below 0.4 V

Status A/F (O2) Sensor Current B1S1	Status O2 Sensor Voltage B1S2	Actual air fuel ratio, air fuel ratio sensor and heated oxygen sensor condition	Main Suspected Trouble Area	Proceed to
Lean/Rich	Lean/Rich	Normal	Three-way catalytic converter Gas leak from exhaust system EGR valve assembly	A
Lean	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
Rich	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
Lean/Rich	Lean	Heated oxygen sensor malfunction	Heated oxygen sensor Gas leak from exhaust system	C
Lean/Rich	Rich	Heated oxygen sensor malfunction	Heated oxygen sensor Gas leak from exhaust system	C
Lean	Lean	Actual air fuel ratio lean	Extremely lean actual air fuel ratio Gas leak from exhaust system EGR valve assembly	D
Rich	Rich	Actual air fuel ratio rich	Extremely rich actual air fuel ratio Gas leak from exhaust system EGR valve assembly	D

Lean: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently higher than 0.037 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently below 0.4 V.
Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently higher than 0.55 V.
Lean/Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the output voltage of the fuel ratio sensor (A/F (O2) Sensor Current B1S1) or heated oxygen sensor (O2 Sensor Voltage B1S2) alternates correctly.

Post-procedure1

(e) None

GO TO STEP 6

GO TO STEP 7

GO TO STEP 9

3.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

GO TO STEP 41

4.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 44

5.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

GO TO STEP 44

REPLACE EGR VALVE ASSEMBLY

6.	REPLACE AIR FUEL RATIO SENSOR

HINT:

Click here

GO TO STEP 42

7.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

GO TO STEP 41

8.	REPLACE HEATED OXYGEN SENSOR

HINT:

Click here

GO TO STEP 42

9.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

GO TO STEP 41

10.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Post-procedure1

(d) None

GO TO STEP 40

11.	CHECK PCV HOSE CONNECTIONS

Click here

REPAIR OR REPLACE PCV HOSE

12.	CHECK INTAKE SYSTEM

Click here

REPAIR OR REPLACE INTAKE SYSTEM

13.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Click here

Status A/F (O2) Sensor Current B1S1	Status O2 Sensor Voltage B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Suspected Trouble Area	Proceed to
Lean/Rich	Lean/Rich	Normal	-	A
Lean	Lean	Actual air fuel ratio lean	PCV valve and hose PCV hose connections Fuel injector assembly blockage Gas leak from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor EGR valve assembly
Rich	Rich	Actual air fuel ratio rich	Fuel injector assembly leak or blockage Gas leak from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor
Lean	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
Rich	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B

GO TO STEP 22

14.	READ VALUE USING GTS (COOLANT TEMPERATURE)

Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

15.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Click here

GO TO STEP 17

16.	INSPECT EGR VALVE ASSEMBLY

Click here

REPLACE EGR VALVE ASSEMBLY

17.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Click here

Result	Proceed to
The value of Mass Air Flow Sensor is between 4.5 and 8.5 gm/sec	A
None of the above conditions are met	B

GO TO STEP 29

18.	CHECK FUEL PRESSURE

Click here

REPAIR OR REPLACE FUEL SYSTEM

19.	CHECK FOR EXHAUST GAS LEAK

Click here

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

REPAIR OR REPLACE EXHAUST SYSTEM

20.	INSPECT IGNITION SYSTEM

Click here

HINT:

Perform "Inspection After Repair" after repairing or replacing the ignition system.

Click here

REPAIR OR REPLACE IGNITION SYSTEM

21.	INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

Click here

GO TO STEP 29

REPLACE FUEL INJECTOR ASSEMBLY

22.	INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Click here

REPLACE AIR FUEL RATIO SENSOR

23.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR)

Click here

GO TO STEP 32

24.	CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

25.	REPLACE AIR FUEL RATIO SENSOR

Click here

26.

CLEAR DTC

Click here

27.	CHECK WHETHER DTC OUTPUT RECURS (DTC P042000)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P042000 is output	B

Post-procedure1

END

28.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

Click here

29.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

Click here

30.

CLEAR DTC

Click here

31.	CHECK WHETHER DTC OUTPUT RECURS (DTC P042000)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P042000 is output	B

Post-procedure1

END

GO TO STEP 36

32.	INSPECT EFI-MAIN NO. 2 RELAY

Click here

REPLACE EFI-MAIN NO. 2 RELAY

33.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY)

34.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

35.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - AIR FUEL RATIO SENSOR)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

36.	CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

37.	REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Click here

38.

CLEAR DTC

Click here

39.	CHECK WHETHER DTC OUTPUT RECURS (DTC P042000)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P042000 is output	B

Post-procedure1

END

REPLACE ECM

40.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

41.	REPAIR OR REPLACE EXHAUST SYSTEM

(a) Repair or replace exhaust system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

42.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

43.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P042000 is output	B

Post-procedure1

END

44.	REPLACE EXHAUST MANIFOLD (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST)

NOTICE:

When replacing the exhaust manifold and front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor and the heated oxygen sensor.

HINT:

Confirm the replacement parts, referring to the illustration in the Catalyst Location.

(a) Replace the exhaust manifold (TWC: Front catalyst).

HINT:

Click here

(b) Replace the front exhaust pipe assembly (TWC: Rear catalyst).

HINT:

Click here

END

Evaporative Emission System Purge Control Valve "A" Circuit Open (P044313)

DESCRIPTION

To reduce hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through a canister to the intake manifold for combustion in the cylinders.

The ECM changes the duty signals to the purge VSV so that the intake amount of evaporated fuel routed to the cylinders is appropriate for the driving conditions (engine load, engine speed, Toyota Prius vehicle speed, etc.) after the engine is warmed up.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P044313	Evaporative Emission System Purge Control Valve "A" Circuit Open	Both of the following conditions are met for 10 seconds or more (1 trip detection logic): The purge VSV operation duty signal is 5 to 95%. The target control value and actual control value do not match.	Open or short in purge VSV circuit Purge VSV ECM	Comes on	Engine	A	SAE Code: P0443

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
HINT:

The A/C switch and all accessories should be off.
Idle the engine for 15 minutes or more [B].
HINT:

Check the Data List item "EVAP (Purge) VSV". When the value of this item is between 5 and 95%, the judgment will be performed.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P044313.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [D] and [E].
With the engine running, drive the Toyota Prius vehicle at a constant speed between 40 and 60 km/h (25 and 37 mph) for 10 minutes or more [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P044313.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS (ACTIVATE THE EVAP PURGE VSV)

Pre-procedure1

(a) Disconnect the fuel vapor feed hose assembly (canister side) of the purge VSV.

*a	VSV is on
*b	VSV is off

(b) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Procedure1

(d) When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction your finger.

Powertrain > Engine > Active Test

Tester Display
Activate the EVAP Purge VSV

OK:

GTS Operation	Specified Condition
ON	Purge VSV port applies suction to finger
OFF	Purge VSV port applies no suction to finger

HINT:

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

Post-procedure1

(e) None

CHECK FOR INTERMITTENT PROBLEMS

2.	INSPECT PURGE VSV

Click here

REPLACE PURGE VSV

3.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

Pre-procedure1

(a) Disconnect the purge VSV connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C29) Click Connector(C29)

Tester Connection	Condition	Specified Condition	Result
C29-2 ( B) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - PURGE VSV)

4.	CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

Pre-procedure1

(a) Disconnect the purge VSV connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C29,C53) Click Connector(C29) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C29-1 (EVP1) - C53-33 (PRG)	Always	Below 1 Ω	Ω
C29-1 (EVP1) - C53-33 (PRG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

System Voltage Circuit Short to Ground or Open (P056014)

MONITOR DESCRIPTION

The auxiliary battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the auxiliary battery voltage falls below a minimum level, the memory is cleared and the ECM determines that there is a malfunction in the power supply circuit. The ECM will illuminate the MIL and store this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P056014	System Voltage Circuit Short to Ground or Open	An open or short in the ECM backup power source circuit (1 trip detection logic).	Open or short in back up power source circuit Auxiliary battery Auxiliary battery terminals ECM	Comes on	Engine	A	SAE Code: P0562

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

TYPICAL MALFUNCTION THRESHOLDS

Continuous auxiliary battery voltage

Less than 3.5 V

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P056014.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

1.	INSPECT AUXILIARY BATTERY

(a) Inspect the auxiliary battery.

Click here

OK:

Auxiliary battery voltage is between 11 to 14 V.

CHARGE OR REPLACE AUXILIARY BATTERY

2.	CHECK AUXILIARY BATTERY TERMINAL

(a) Check that the auxiliary battery terminals are not loose or corroded.

Click here

OK:

Auxiliary battery terminals are not loose or corroded.

REPAIR OR REPLACE AUXILIARY BATTERY TERMINAL

3.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)

Pre-procedure1

(a) Disconnect the ECM connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Condition	Specified Condition	Result
A91-1 (BATT) - Body ground	Always	11 to 16 V	V

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - ECM)

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

5.	CHECK WHETHER DTC OUTPUT RECURS (DTC P056014)

Pre-procedure1

(a) Wait 5 seconds or more.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P056014 is output	B

Post-procedure1

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Internal Control Module Random Access Memory (RAM) Error Data Memory Failure (P060444)

MONITOR DESCRIPTION

The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. The ECM memory status is diagnosed by internal mirroring of the main CPU and sub CPU to detect Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P060444	Internal Control Module Random Access Memory (RAM) Error Data Memory Failure	ECM RAM error (1 trip detection logic).	ECM	Comes on	Engine	A	SAE Code: P0604

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the GTS off.
Turn the ignition switch off.
Disconnect the GTS.
Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch ON.
Wait 16 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P060444.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	READ OUTPUT DTC (DTC P060444)

Pre-procedure1

(a) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Wait 16 seconds or more.

Procedure1

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P060444 is output	B

Post-procedure1

(f) None

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Control Module Processor Watchdog/Safety MCU Failure (P060647)

MONITOR DESCRIPTION

The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P060647	Control Module Processor Watchdog/Safety MCU Failure	ECM main CPU malfunction (1 trip detection logic)	ECM	Comes on	Engine	A	SAE Code: P0606

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the GTS off.
Turn the ignition switch off.
Disconnect the GTS.
Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch ON.
Wait 1 second or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P060647.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	READ OUTPUT DTC (DTC P060647)

Pre-procedure1

(a) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Wait 1 second or more.

Procedure1

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P060647 is output	B

Post-procedure1

(f) None

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Control Module Performance Bank 1 Watchdog/Safety MCU Failure (P060747,P060787)

MONITOR DESCRIPTION

The ECM continuously monitors its internal ICs and the monitor IC. If the monitor IC is abnormal, the ECM illuminates the MIL and stores DTC P060747. If an internal IC is abnormal, the ECM illuminates the MIL and stores DTC P060787.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P060747	Control Module Performance Bank 1 Watchdog/Safety MCU Failure	ECM monitor IC malfunction (1 trip detection logic).	ECM	Comes on	Engine	A	SAE Code: P0607
P060787	Control Module Performance Bank 1 Missing Message	ECM internal IC malfunction (1 trip detection logic).	ECM	Comes on	Engine	A	SAE Code: P0607

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the GTS off.
Turn the ignition switch off.
Disconnect the GTS.
Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the ignition switch ON.
Wait 1 second or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P060747 or P060787
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- [A] to [B]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	READ OUTPUT DTC (DTC P060747 OR P060787)

Pre-procedure1

(a) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.

(b) Connect the cable to the negative (-) auxiliary battery terminal.

Procedure1

(d) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P060747 or P060787 is output	B

Post-procedure1

(e) None

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

Internal Control Module Throttle Position Performance Internal Electronic Failure (P060E49)

MONITOR DESCRIPTION

The ECM monitors the signals received from the No. 1 throttle position sensor. As the ECM monitors the VTA1 signal of the No. 1 throttle position sensor, if these signals do not correlate, a DTC will be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P060E49	Internal Control Module Throttle Position Performance Internal Electronic Failure	Either of the following conditions is met (1 trip detection logic): ECM main CPU malfunction. ECM sub CPU malfunction.	ECM	Comes on	Engine	A	SAE Code: P060E

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the GTS off.
Turn the ignition switch off.
Disconnect the GTS.
Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
Connect the cable to the negative (-) auxiliary battery terminal.
Connect the GTS to the DLC3.
Turn the ignition switch ON.
Wait 16 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P060E49.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

2.	READ OUTPUT DTC (DTC P060E49)

Pre-procedure1

(a) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Wait 16 seconds or more.

Procedure1

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P060E49 is output	B

Post-procedure1

(f) None

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

VIN Not Programmed (P063051)

MONITOR DESCRIPTION

DTC P063051 is stored when the Vehicle Identification Number (VIN) or frame number is not stored in the ECM or the stored VIN or frame number is not accurate.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P063051	VIN Not Programmed	Either of the following conditions is met (1 trip detection logic). The VIN or frame number is not stored in the ECM. The VIN or frame number written to the ECM is not accurate.	VIN or frame number code ECM	Comes on	Engine	B	SAE Code: P0630

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P063051.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P063051)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

NOTICE:

If P063051 is output, the VIN or frame number must be written to the ECM using the GTS. However, all DTCs are cleared automatically by the GTS when the VIN or frame number is written. If DTCs other than P063051 are output, troubleshoot them first.

Result	Proceed to
P063051 and other DTCs are output	A
P063051 is output	B

GO TO DTC CHART

2.	WRITE VIN OR FRAME NUMBER

(a) Write the VIN or frame number.

Click here

END

Actuator Supply Voltage "A" Circuit Short to Ground or Open (P065714)

DESCRIPTION

The electronic throttle control system has a dedicated power supply circuit. The voltage ( BM) is monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the ignition switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P065714	Actuator Supply Voltage "A" Circuit Short to Ground or Open	An open or short is detected in the electronic throttle control system power source ( BM) circuit (1 trip detection logic).	Open or short in electronic throttle control system power source circuit ECM	Comes on	Engine	A	SAE Code: P0658

MONITOR DESCRIPTION

The ECM monitors the auxiliary battery supply voltage applied to the throttle actuator.

When the power supply voltage ( BM) is less than 4 V for 0.8 seconds or more, the ECM interprets this as an open or ground short in the power supply circuit, then illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Required Sensors/Components

Throttle actuator

Throttle valve (throttle body assembly)

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
Slowly depress the accelerator pedal, raise the engine speed to approximately 2500 rpm over approximately 5 seconds, and then idle the engine [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Check that 16 seconds or more have elapsed since the engine was started.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P065714.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] and [C] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

Refer to DTC P210018.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P065714)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P065714 is output	A
DTCs are not output	B

REPLACE ECM

CHECK FOR INTERMITTENT PROBLEMS

Throttle Actuator "A" Control Motor Circuit Current Below Threshold (P210018,P210019)

DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears.

The opening angle of the throttle valve is detected by the throttle position sensor, which is built into the throttle body assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to a request from the hybrid system.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P210018	Throttle Actuator "A" Control Motor Circuit Current Below Threshold	Both of the following conditions are met for 2 seconds or more (1 trip detection logic): The throttle actuator drive duty cycle is 80% or higher. The throttle actuator current is less than 0.5 A.	Open or short in throttle actuator circuit Throttle actuator ECM	Comes on	Engine	A	SAE Code: P2102
P210019	Throttle Actuator "A" Control Motor Circuit Current Above Threshold	Either of the following conditions is met (1 trip detection logic): A motor driver IC high current limiter monitor input malfunction is detected. A motor driver IC high current inhibit signal is received.	Open or short in throttle actuator circuit Throttle actuator Throttle valve Throttle body assembly ECM	Comes on	Engine	A	SAE Code: P2103

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not operate properly (for example, it is stuck open), the ECM will determines there is a malfunction, illuminate the MIL and store a DTC.

MONITOR STRATEGY

Required Sensors/Components	Throttle actuator (throttle body assembly)
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Check that 16 seconds or more have elapsed since the accelerator pedal was first depressed.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P210018 or P210019.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] and [C] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Duty Ratio (Open) / Throttle Motor Duty Ratio (Close)) can be read using the GTS. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.

PROCEDURE

1.	INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

Click here

REPLACE THROTTLE BODY ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (THROTTLE BODY ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-2 (M ) - C53-29 (M )	Always	Below 1 Ω	Ω
C24-1 (M-) - C53-30 (M-)	Always	Below 1 Ω	Ω
C24-2 (M ) or C53-29 (M ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-1 (M-) or C53-30 (M-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign matter between the throttle valve and the housing.

OK:

No foreign matter between the throttle valve and housing.

HINT:

Perform "Inspection After Repair" after cleaning the throttle body assembly.

Click here

REMOVE FOREIGN MATTER AND CLEAN THROTTLE BODY ASSEMBLY

4.	INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)

(a) Check if the throttle valve opens and closes smoothly.

OK:

Throttle valve opens and closes smoothly.

REPLACE ECM

REPLACE THROTTLE BODY ASSEMBLY

Throttle/Pedal Position Sensor "A" Minimum Stop Performance (P210900)

DESCRIPTION

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve. The ECM controls the throttle actuator to adjust the throttle valve opening amount so that the idle speed is maintained at the target idle speed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P210900	Throttle/Pedal Position Sensor "A" Minimum Stop Performance	The ISC learned value is approximately 3 times larger than normal even though the actual intake air amount during idle is within the normal range (up to 1.5 times the normal amount) (1 trip detection logic).	Throttle body assembly	Does not come on	Engine	B	SAE Code: P2109

HINT:

The ISC learned value is the calculated intake air amount corresponding to the throttle opening amount necessary to maintain the idling speed.
This malfunction is only detected once per trip. After it has been detected once, the system will not monitor for the malfunction for the rest of the trip.
The system uses the throttle body assembly and mass air flow meter sub-assembly to detect this malfunction.

MONITOR DESCRIPTION

If there are deposits in the throttle valve, a decrease in the ISC flow rate may cause engine stall or unstable idling. Therefore, the necessary ISC flow rate for idling is maintained using the ISC learned value and feedback. The ECM stores this DTC if the ISC learned value approaches its limit. The ECM begins monitoring for the DTC detection conditions when the following preconditions are met:

The mass air flow meter sub-assembly is normal.
Atmospheric pressure is 85 kPa(abs) [12.3 psi(abs)] or higher.
The Toyota Prius vehicle has been driven at a speed of 30 km/h (19 mph) or more at least once.
The engine coolant temperature is 45°C (113°F) or less at engine start, the engine is warmed up and conditions for ISC learning are met, or the ignition switch has been turned ON (READY) (including when the engine is running) for 1 hour or more, the engine is warmed up and conditions for ISC learning are met.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Since a pending DTC is not stored for this DTC, it takes time to confirm whether the malfunction has been successfully repaired by checking for this DTC. When confirming whether the malfunction has been successfully repaired, compare "ISC Learning Value" recorded in the freeze frame data with "ISC Learning Value" in the Data List after repairs have been made to save time.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P210900)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P210900 and other DTCs are output	A
P210900 is output	B

HINT:

If any DTCs other than P210900 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	READ FREEZE FRAME DATA (ISC LEARNING VALUE)

(a) Using the GTS, check "ISC Learning Value" in the freeze frame data.

HINT:

Click here
Be sure to confirm that the freeze frame date item "ISC Learning Value" is the same as that used when confirming whether the malfunction has been successfully repaired.

3.	INSPECT THROTTLE BODY ASSEMBLY

(a) Check for foreign matter between the throttle valve and the housing.

*1	Throttle Body Assembly	*2	Bore
*3	Throttle Valve	-	-
*a	Reference	*b	Throttle Body Assembly Cross-section Diagram
*c	When valve fully opened	*d	Deposits

HINT:

The illustration is for reference only, actual parts may differ.

Result	Proceed to
Foreign matter between the throttle valve and housing	A
No foreign matter between the throttle valve and housing	B

REPLACE THROTTLE BODY ASSEMBLY

4.	REMOVE FOREIGN MATTER (CLEAN THROTTLE BODY ASSEMBLY)

(a) Clean off any deposits inside of the throttle body assembly.

*1	Throttle Body Assembly	*2	Bore
*3	Throttle Valve	-	-
*a	Reference	*b	Throttle Body Assembly Cross-section Diagram
*c	When valve fully opened	*d	Do not directly apply cleaner
*e	Deposits	-	-

(1) Push open the throttle valve and wipe off any deposits from the valve and bore using a cloth soaked in non-residue solvent.

NOTICE:

Make sure that the cloth or your fingers do not get caught in the valve.
Make sure that foreign matter does not enter the throttle valve.
Do not directly apply non-residue solvent to the throttle body assembly or wash the throttle body assembly. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.
If there is coating material on the edge of the throttle valve, be careful not to remove it.
Push the throttle valve open gently with your finger and check that the throttle valve moves smoothly.

HINT:

If the throttle valve does not open smoothly, replace the throttle body assembly.
Click here
The illustration is for reference only, actual parts may differ.

5.	READ VALUE USING GTS (ISC LEARNING VALUE)

Pre-procedure1

(a) Perform "Inspection After Repair" after cleaning the throttle body assembly.

HINT:

Click here

Procedure1

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
ISC Learning Value

OK:

The value of ISC Learning Value is half or less of ISC Learning Value recorded in the freeze frame data.

Post-procedure1

END

REPLACE THROTTLE BODY ASSEMBLY

Throttle Actuator "A" Control System Actuator Stuck Open (P211172,P211173)

DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is built into the throttle body assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to a request from the hybrid system.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P211172	Throttle Actuator "A" Control System Actuator Stuck Open	The ECM signals the throttle actuator to close, but the actuator is stuck (1 trip detection logic).	Throttle actuator Throttle body assembly Throttle valve Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P2111
P211173	Throttle Actuator "A" Control System Actuator Stuck Closed	The ECM signals the throttle actuator to open, but the actuator is stuck (1 trip detection logic).	Throttle actuator Throttle body assembly Throttle valve Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P2112

MONITOR DESCRIPTION

If throttle valve remains at a certain angle despite a high drive current from the ECM, the ECM determines that there is a malfunction in the ETCS, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components	Throttle actuator (throttle body assembly)
Frequency of Operation	Continuous

TYPICAL ENABLING CONDITIONS

P2111: Throttle Actuator Stuck Open

All of the following conditions are met	-
System guard* judge condition	On
Throttle actuator current	2 A or higher
Duty-cycle to close throttle	80% or higher

P2112: Throttle Actuator Stuck Closed

All of the following conditions are met	-
System guard* judge condition	On
Throttle actuator current	2 A or higher
Duty-cycle to open throttle	80% or higher

*: System guard set when following conditions are met	-
Throttle actuator	On
Throttle actuator duty calculation	Executing
Throttle position sensor fail	Not detected
Throttle actuator current-cut operation	Not executing
Throttle actuator power supply	4 V or higher
Throttle actuator fail	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P2111: Throttle Actuator Stuck Open

Throttle position sensor voltage

No change

P2112: Throttle Actuator Stuck Closed

Throttle position sensor voltage

No change

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and depress and release the accelerator pedal quickly (to open and close the throttle valve) [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P211172 or P211173.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

FAIL-SAFE

When these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle valve opening angle by the return spring. The ECM stops the engine and the Toyota Prius vehicle can be driven using solely the hybrid system. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

Refer to DTC P210018.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Refer to "Data List / Active Test" [Throttle Position Sensor No.1 Voltage, Throttle Position Sensor No.2 Voltage, Throttle Position Command, Throttle Motor Current, Throttle Motor Duty Ratio (Open) and Throttle Motor Duty Ratio (Close)].

Click here

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P211172 OR P211173)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P211172 or P211173 and other DTCs are output	A
P211172 or P211173 is output	B

HINT:

If any DTCs other than P211172 or P211173 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body assembly. Also check that the throttle valve moves smoothly.

OK:

Throttle valve is not contaminated with foreign matter and moves smoothly.

HINT:

Perform "Inspection After Repair" after cleaning the throttle body assembly.

Click here

GO TO STEP 6

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	READ VALUE USING GTS (THROTTLE POSITION)

(a) Read the values displayed on the GTS while wiggling the ECM wire harness.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage
Throttle Position Sensor No.2 Voltage
Throttle Position Command

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
Value in Data List changes when wire harness is wiggled, or DTC is output	A
Other than above	B

GO TO STEP 7

5.	REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY ASSEMBLY - ECM)

(a) As the DTC was stored due to a change in the contact resistance of the connector, repair or replace the wire harness or connector.

HINT:

Click here

END

6.	REPLACE THROTTLE BODY ASSEMBLY

HINT:

Click here

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

8.	CHECK WHETHER DTC OUTPUT RECURS (DTC P211172 OR P211173)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P211172 or P211173 is output	B

Post-procedure1

END

REPLACE ECM

Throttle Actuator "A" Control Throttle Body Range/Performance (P211900,P211904,P211977,P21199B)

DESCRIPTION

The electronic throttle control system is composed of the throttle actuator, throttle position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to a request from the hybrid system. The throttle position sensor detects the opening angle of the throttle valve, and provides the ECM with feedback so that the throttle valve can be appropriately controlled by the ECM.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P211900	Throttle Actuator "A" Control Throttle Body Range/Performance	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P2119
P211904	Throttle Actuator "A" Control Throttle Body Range/Performance System Internal Failure	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P2119
P211977	Throttle Actuator "A" Control Throttle Body Range/Performance Commanded Position Not Reachable	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P2119
P21199B	Throttle Actuator "A" Control Throttle Body High/Excessive Flow	The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic).	Electronic throttle control system Wire harness or connector ECM	Comes on	Engine	B	SAE Code: P2119

MONITOR DESCRIPTION

The ECM determines the actual opening angle of the throttle valve from the throttle position sensor signal. The actual opening angle is compared to the target opening angle commanded by the ECM. If the difference between these two values is outside the standard range, the ECM interprets this as a malfunction in the electronic throttle control system, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Required Sensors/Components	Throttle actuator (throttle body assembly)
Frequency of Operation	Continuous

TYPICAL ENABLING CONDITIONS

System guard* judge condition

*: System guard is on when the following conditions are met	-
Throttle actuator	On
Throttle actuator duty calculation	Executing
Throttle position sensor fail	Not detected
Throttle actuator current-cut operation	Not executing
Throttle actuator power supply	4 V or higher
Throttle actuator fail	Not detected

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met	1 or 2
1. Difference between commanded closed throttle position and current closed throttle position	0.3 V or higher
2. Difference between commanded open throttle position and current open throttle position	0.3 V or higher

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
Idle the engine for 20 seconds.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P211900, P211904 or P211977.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, fully depress and release the accelerator pedal 3 times, and then check the DTC judgment result [C].
- During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [C] after charge control has completed.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

Refer to DTC P210018.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Click here

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P211900, P211904, P211977 OR P21199B)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P211900, P211904, P211977 or P21199B and other DTCs are output	A
P211900, P211904, P211977 or P21199B is output	B

HINT:

If any DTCs other than P211900, P211904, P211977 or P21199B are output, troubleshoot those DTCs first.

GO TO DTC CHART

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

3.	READ VALUE USING GTS (THROTTLE POSITION)

(a) Turn the ignition switch on (READY).

(b) Read the values displayed on the GTS while fully depressing and releasing the accelerator pedal quickly.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage
Throttle Position Command

HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform this step after charge control has completed.

Result	Proceed to
Throttle Position Sensor No.1 Voltage does not change	A
Throttle Position Sensor No.1 Voltage changes even a little	B

HINT:

When a DTC is output, the system changes to fail-safe mode. Therefore, only use the data up until the time the DTC is stored for confirmation.

GO TO STEP 5

4.	INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

Click here

GO TO STEP 9

5.	INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body assembly. Also, check that the throttle valve moves smoothly.

OK:

Throttle valve is not contaminated with foreign matter and moves smoothly.

HINT:

Perform "Inspection After Repair" after cleaning the throttle body assembly.

Click here

GO TO STEP 9

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

7.	READ VALUE USING GTS (THROTTLE POSITION)

(a) Read the values displayed on the GTS while wiggling the ECM wire harness.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage
Throttle Position Sensor No.2 Voltage
Throttle Position Command

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
Value in Data List changes when wire harness is wiggled, or DTC is output	A
Other than above	B

GO TO STEP 10

8.	REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY ASSEMBLY - ECM)

(a) As the DTC was stored due to a change in the contact resistance of the connector, repair or replace the wire harness or connector.

HINT:

Click here

END

9.	REPLACE THROTTLE BODY ASSEMBLY

HINT:

Click here

10.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

11.	CHECK WHETHER DTC OUTPUT RECURS (DTC P211900, P211904, P211977 OR P21199B)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P211900, P211904, P211977 or P21199B is output	B

Post-procedure1

END

REPLACE ECM

Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)

DESCRIPTION

Refer to DTC P012011.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P21352B	Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled	The difference between the output voltage of VTA1 and VTA2 is 0.02 V or less for 2 seconds or more (1 trip detection logic).	Throttle position sensor (throttle body assembly) Short between VTA1 and VTA2 circuits Open in ETA circuit ECM	Comes on	Engine	A	SAE Code: P2135

MONITOR DESCRIPTION

VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V or less of VTA2 for 2 seconds or more, the ECM will determine there is a short in the sensor circuit, illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine.
With the Toyota Prius vehicle stationary, fully depress and release the accelerator pedal [B].
HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.
Idle the engine for 2 seconds or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P21352B.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

FAIL-SAFE

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P012011.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	READ VALUE USING GTS (THROTTLE POSITION SENSOR VOLTAGE)

(a) Read the values displayed on the GTS.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage
Throttle Position Sensor No.2 Voltage

Result	Proceed to
Value of both Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage are less than 0.56 V	A
Value of both Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage are higher than 4.535 V	B
Value of both Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage are between 0.56 V and 4.535 V	C

GO TO STEP 4

GO TO STEP 6

2.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C53-134 (VCTA)	Always	Below 1 Ω	Ω
C24-6 (VTA) - C53-135 (VTA1)	Always	Below 1 Ω	Ω
C24-4 (VTA2) - C53-101 (VTA2)	Always	Below 1 Ω	Ω
C24-3 (E2) - C53-133 (ETA)	Always	Below 1 Ω	Ω
C24-5 (VC) or C53-134 (VCTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-6 (VTA) or C53-135 (VTA1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-4 (VTA2) or C53-101 (VTA2) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C24-3 (E2)	Ignition switch ON	4.5 to 5.5 V	V

Post-procedure1

(d) None

REPLACE THROTTLE BODY ASSEMBLY

REPLACE ECM

4.	CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-3 (E2) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPLACE THROTTLE BODY ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24,C53) Click Connector(C24) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C24-5 (VC) - C53-134 (VCTA)	Always	Below 1 Ω	Ω
C24-6 (VTA) - C53-135 (VTA1)	Always	Below 1 Ω	Ω
C24-4 (VTA2) - C53-101 (VTA2)	Always	Below 1 Ω	Ω
C24-3 (E2) - C53-133 (ETA)	Always	Below 1 Ω	Ω
C24-5 (VC) or C53-134 (VCTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-6 (VTA) or C53-135 (VTA1) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C24-4 (VTA2) or C53-101 (VTA2) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-6 (VTA) - C24-4 (VTA2)	Always	10 kΩ or higher	kΩ

Post-procedure1

REPLACE THROTTLE BODY ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT)

Pre-procedure1

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C24) Click Connector(C24)

Tester Connection	Condition	Specified Condition	Result
C24-6 (VTA) - C24-4 (VTA2)	Always	10 kΩ or higher	kΩ

HINT:

If the resistance changes when the ECM connector is disconnected, there is an internal short in the ECM.

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM)

A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Circuit Current Above Threshold (P219519,P219524,P219618,P219623)

DESCRIPTION

Refer to DTC P003012.

Click here

HINT:

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P219519	A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Circuit Current Above Threshold	While the fuel-cut operation is performed (during Toyota Prius vehicle deceleration), the air fuel ratio sensor current is 2.2 mA or higher for 3 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) Intake system Exhaust gas leak Fuel pressure Fuel injector assembly EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P2195
P219524	A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Signal Stuck High	Both of the following conditions are met for 5 seconds or more (2 trip detection logic): Current is more than 0.1883 mA. Heated oxygen sensor voltage is 0.21 V or higher.	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) Intake system Exhaust gas leak Fuel pressure Fuel injector assembly EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P2195
P219618	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 Circuit Current Below Threshold	While the fuel-cut operation is performed (during Toyota Prius vehicle deceleration), the air fuel ratio sensor current is less than 0.7 mA for 3 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) Intake system Exhaust gas leak Fuel pressure Fuel injector assembly EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P2196
P219623	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1 Signal Stuck Low	Both of the following conditions are met for 5 seconds or more (2 trip detection logic): Current is less than -0.1883 mA. Heated oxygen sensor voltage is less than 0.71 V.	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) Intake system Exhaust gas leak Fuel pressure Fuel injector assembly EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P2196

HINT:

When any of these DTCs are stored, check the air fuel ratio sensor output voltage by entering the following menus on the GTS: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S1.
Short-term fuel trim values can also be read using the GTS.
The ECM regulates the voltages at terminals A1A and A1A- of the ECM to a constant level. Therefore, the air fuel ratio sensor output voltage cannot be confirmed without using the GTS.
If an air fuel ratio sensor malfunction is detected, the ECM will store a DTC.

MONITOR DESCRIPTION

Sensor Voltage Detection Monitor:

Under air fuel ratio feedback control, If the air fuel ratio sensor output current is less than -0.1883 mA (very rich condition) for 5 seconds despite the heated oxygen sensor output voltage being less than 0.71 V, the ECM stores DTC P219623. Alternatively, if the air fuel ratio sensor output current is more than 0.1883 mA (very lean condition) for 5 seconds despite the heated oxygen sensor output voltage being 0.21 V or higher, DTC P219524 is stored.

Sensor Current Detection Monitor:

A rich air fuel mixture causes a low air fuel ratio sensor current, and a lean air fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel-cut and detects any abnormal current values.

If the air fuel ratio sensor output is 2.2 mA or higher for 3 seconds or more of cumulative time, the ECM interprets this as a malfunction of the air fuel ratio sensor and stores DTC P219519 (stuck on high side). If the air fuel ratio sensor output is less than 0.7 mA for 3 seconds or more of cumulative time, the ECM stores DTC P219618 (stuck on low side).

MONITOR STRATEGY

Required Sensors/Components (Main)	Air fuel ratio sensor
Required Sensors/Components (Related)	Heated oxygen sensor
Frequency of Operation	Continuous: Sensor voltage detection monitor Once per driving cycle: Sensor current detection monitor
Duration	3 seconds: Sensor current detection monitor 5 seconds: Sensor voltage detection monitor

TYPICAL ENABLING CONDITIONS

Air Fuel Ratio Sensor Low/High Current

Time after engine start	30 seconds or more
Auxiliary battery voltage	11 V or higher
Air fuel ratio sensor status	Activated
Fuel system status	Closed-loop

Air Fuel Ratio Sensor Limit Current

Auxiliary battery voltage	11 V or higher
Engine coolant temperature	75°C (167°F) or higher
Atmospheric pressure	76 kPa(abs) [11 psi(abs)] or higher
Air fuel ratio sensor status	Activated
Continuous time of fuel-cut	3 seconds or more, and less than 10 seconds

TYPICAL MALFUNCTION THRESHOLDS

P219524: Sensor Voltage Detection Monitor (Lean Side Malfunction)

Heated oxygen sensor voltage	0.21 V or higher
Air fuel ratio sensor current	More than 0.1883 mA

P219623: Sensor Voltage Detection Monitor (Rich Side Malfunction)

Heated oxygen sensor voltage	Less than 0.71 V
Air fuel ratio sensor current	Less than -0.1883 mA

P219519: Sensor Current Detection Monitor (High Side Malfunction)

Duration of following condition	3 seconds or more
Air fuel ratio sensor current	2.2 mA or higher

P219618: Sensor Current Detection Monitor (Low Side Malfunction)

Duration of following condition	3 seconds or more
Air fuel ratio sensor current	Less than 0.7 mA

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
With the engine running, drive the Toyota Prius vehicle at a speed between 75 and 100 km/h (47 and 62 mph) for at least 10 minutes [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
With shift state B selected [C] and the engine running, accelerate the Toyota Prius vehicle to 75 km/h (47 mph) or more by depressing the accelerator pedal for at least 10 seconds [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Soon after performing step [D] above, release the accelerator pedal for at least 5 seconds without depressing the brake pedal in order to execute fuel-cut control [E].
Allow the Toyota Prius vehicle to decelerate until the vehicle speed is less than 10 km/h (6 mph).
Repeat steps [C] through [E] above at least 3 times in one driving cycle.
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P219519, P219524, P219618 or P219623.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform steps [B] through [F] again.

WIRING DIAGRAM

Refer to DTC P003012.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P219519, P219524, P219618 OR P219623)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P219519, P219524, P219618 or P219623 and other DTCs are output	A
P219519, P219524, P219618 or P219623 is output	B
P219519, P219524, P219618 or P219623 is output and any DTCs in the table below are output	C

System	Relevant DTC
SFI System	P013613	O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open
	P013617	O2 Sensor Circuit Bank 1 Sensor 2 Circuit Voltage Above Threshold
	P01361C	O2 Sensor Circuit Bank 1 Sensor 2 Circuit Voltage Out of Range

HINT:

If any DTCs relating to the air fuel ratio sensor (DTCs for the air fuel ratio sensor heater or air fuel ratio sensor admittance) are output, troubleshoot those DTCs first.

GO TO DTC CHART

GO TO STEP 2

2.	CONFIRM IF Toyota Prius Vehicle HAS RUN OUT OF FUEL IN PAST

(a) Has the vehicle run out of fuel in the past?

GO TO STEP 5

YES

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	CHECK WHETHER DTC OUTPUT RECURS (DTC P219519, P219524, P219618 OR P219623)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

Procedure1

(b) Check the DTC judgment result.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P219519, P219524, P219618 or P219623 is output)

Post-procedure1

(d) None

DTC CAUSED BY RUNNING OUT OF FUEL

GO TO STEP 5

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

6.	READ VALUE USING GTS (A/F (O2) SENSOR CURRENT B1S1)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

Procedure1

(c) Check the test value of the air fuel ratio sensor output current during fuel-cut, referring to the Driving Pattern Detail for [C] through [E] in Confirmation Driving Pattern.

Powertrain > Engine > Data List

Tester Display
A/F (O2) Sensor Current B1S1

HINT:

To measure the air fuel ratio sensor current precisely, perform the fuel-cut operation as long as possible.
If it is difficult to measure the air fuel ratio sensor current, use the snapshot function of the GTS.

Test Value

Proceed to

Within normal range

(0.7 mA or higher, and less than 2.2 mA)

Outside normal range

(Less than 0.7 mA, or 2.2 mA or higher)

Post-procedure1

(d) None

GO TO STEP 17

7.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Procedure1

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
The air fuel ratio sensor is displayed as A/F (O2) Sensor Current B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the GTS.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

GTS Display (Sensor)	Injection Volume	Status	Voltage
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	12.5%	Rich	Below -0.075 mA
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	-12.5%	Lean	Higher than 0.037 mA
O2 Sensor Voltage B1S2 (Heated oxygen)	12.5%	Rich	Higher than 0.55 V
O2 Sensor Voltage B1S2 (Heated oxygen)	-12.5%	Lean	Below 0.4 V

Status of A/F (O2) Sensor Current B1S1	Status of O2 Sensor Voltage B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Proceed to
Lean	Lean	Actual air fuel ratio lean	A
Rich	Rich	Actual air fuel ratio rich	A
Lean	Lean/Rich	Air fuel ratio sensor malfunction	B
Rich	Lean/Rich	Air fuel ratio sensor malfunction	B
Lean/Rich	Lean/Rich	Normal	C

Lean: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently higher than 0.037 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently below 0.4 V.
Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently higher than 0.55 V.
Lean/Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the output voltage of the fuel ratio sensor (A/F (O2) Sensor Current B1S1) or heated oxygen sensor (O2 Sensor Voltage B1S2) alternates correctly.

HINT:

Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1 and O2 Sensor Voltage B1S2].

Click here

Post-procedure1

(e) None

GO TO STEP 17

GO TO STEP 15

8.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

9.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

REPAIR OR REPLACE EXHAUST SYSTEM

10.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result	Proceed to
Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed	A
None of the above conditions are met	B

Post-procedure1

(d) None

GO TO STEP 12

11.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

12.	CHECK FUEL PRESSURE

Click here

GO TO STEP 14

13.	INSPECT FUEL INJECTOR ASSEMBLY

(a) Inspect the fuel injector assembly (whether fuel volume is high or low, and whether injection pattern is poor).

Click here

GO TO STEP 17

REPLACE FUEL INJECTOR ASSEMBLY

14.	INSPECT FUEL PUMP

Click here

REPAIR OR REPLACE FUEL LINE

REPLACE FUEL PUMP

15.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

(d) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result	Proceed to
Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed	A
None of the above conditions are met	B

Post-procedure1

(e) None

GO TO STEP 17

16.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

GO TO STEP 17

REPLACE EGR VALVE ASSEMBLY

17.	REPLACE AIR FUEL RATIO SENSOR

HINT:

Click here

18.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

19.	CHECK WHETHER DTC OUTPUT RECURS (DTC P219519, P219524, P219618 OR P219623)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

Procedure1

(b) Check the DTC judgment result.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P219519, P219524, P219618 or P219623 is output)

Post-procedure1

(d) None

END

REPLACE ECM

Barometric Pressure Sensor "A" Circuit Short to Ground (P222611,P222615)

DESCRIPTION

The atmospheric pressure sensor is built into the ECM. The ECM provides optimal control in response to atmospheric pressure fluctuations.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P222611	Barometric Pressure Sensor "A" Circuit Short to Ground	Open or short in atmospheric pressure sensor circuit (ECM internal malfunction) (1 trip detection logic).	ECM	Comes on	Engine	A	SAE Code: P2228
P222615	Barometric Pressure Sensor "A" Circuit Short to Battery or Open	Open or short in atmospheric pressure sensor circuit (ECM internal malfunction) (1 trip detection logic).	ECM	Comes on	Engine	A	SAE Code: P2229

MONITOR DESCRIPTION

The ECM calculates the atmospheric pressure from the atmospheric pressure sensor output voltage. When the atmospheric sensor assembly output voltage is outside of the normal range, there may be an open or short in the atmospheric pressure sensor circuit or the atmospheric pressure sensor may be malfunctioning. In this case, the ECM will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Required Sensors/Components	Atmospheric pressure sensor (ECM)
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P222611 or P222615.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

REPLACE ECM

Barometric Pressure Sensor "A" Missing Message (P222687,P222696)

DESCRIPTION

Refer to DTC P222611.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P222687	Barometric Pressure Sensor "A" Missing Message	A communication malfunction between the atmospheric pressure sensor and main CPU of the ECM continues for 3 seconds or more. (ECM internal malfunction) (1 trip detection logic)	ECM	Comes on	Engine	A	SAE Code: P2226
P222696	Barometric Pressure Sensor "A" Component Internal Failure	An atmospheric pressure sensor internal malfunction continues for 3 seconds or more. (ECM internal malfunction) (1 trip detection logic)	ECM	Comes on	Engine	A	SAE Code: P2226

MONITOR DESCRIPTION

The ECM calculates the atmospheric pressure based on the output voltage of the atmospheric pressure sensor.

If it is judged that there is a communication malfunction between the atmospheric pressure sensor and main CPU of the ECM or there is an atmospheric pressure sensor internal malfunction, the ECM illuminates the check engine warning light and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components	Atmospheric pressure sensor (ECM)
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 3 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P222687 or P222696.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the Toyota Prius vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

REPLACE ECM

A/F (O2) Sensor Positive Current Control Circuit / Open Bank 1 Sensor 1 (P223700,P223711,P223712,P223713,P22371B,P225111,P225112)

DESCRIPTION

HINT:

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.

Refer to DTC P003012.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P223700	A/F (O2) Sensor Positive Current Control Circuit / Open Bank 1 Sensor 1	Air fuel artio sensor impedance is less than 10 Ω for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2237
P223711	A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground	The A1A voltage is 1.26 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2238
P223712	A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Battery	The A1A voltage is higher than 4.47 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2239
P223713	A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Open	An open or ground short in the circuit between terminals A1A and A1A- of the air fuel ratio sensor while the engine is running (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2237
P22371B	A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Resistance Above Threshold	The air fuel ratio sensor admittance is less than 0.0054 1/Ω (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2238
P225111	O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Ground	The A1A- voltage is 1.07 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2252
P225112	O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Battery	The A1A- voltage is higher than 3.93 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM	Comes on	Engine	A	SAE Code: P2253

MONITOR DESCRIPTION

These DTCs are stored when there is an open or short in the air fuel ratio sensor (sensor 1) circuit, or theair fuel ratio sensor (sensor 1) output value is abnormal. The voltage of the air fuel ratio sensor (sensor1) is monitored while the ignition switch is ON, and the impedance (impedance is an electrical term thatindicates the difficulty of flow of current) is checked while engine running. If the voltage of the air fuelratio sensor (sensor 1) is outside the normal range, or the impedance is outside the normal range, theECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components	Air fuel ratio sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 5 minutes or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P223700, P223711, P223712, P223713, P22371B, P225111 or P225112.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P003012.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1].
Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (AIR FUEL RATIO SENSOR VOLTAGE)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

(a) Disconnect the air fuel ratio sensor connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C45) Click Connector(C45)

Tester Connection	Condition	Specified Condition	Result
C45-3 (A1A ) - Body ground	Ignition switch ON	3.2 to 3.4 V	V
C45-4 (A1A-) - Body ground	Ignition switch ON	2.8 to 3.0 V	V
C45-3 (A1A ) - C45-4 (A1A-)	Ignition switch ON	0.2 to 0.6 V	V

Post-procedure1

(d) None

REPLACE AIR FUEL RATIO SENSOR

2.	CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

Pre-procedure1

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C45,C53) Click Connector(C45) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C45-1 (HA1A) - C53-28 (HA1A)	Always	Below 1 Ω	Ω
C45-3 (A1A ) - C53-132 (A1A )	Always	Below 1 Ω	Ω
C45-4 (A1A-) - C53-131 (A1A-)	Always	Below 1 Ω	Ω
C45-1 (HA1A) or C53-28 (HA1A) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C45-3 (A1A ) or C53-132 (A1A ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
C45-4 (A1A-) or C53-131 (A1A-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Ignition Switch On/Start Position Circuit Low Circuit Short to Ground or Open (P253314)

DESCRIPTION

When the ignition switch is turned ON, the auxiliary battery power source is supplied to the IGP and IGR terminals of the ECM. When the ignition switch is off, the auxiliary battery power source is cut off.

When the ignition switch is turned off during driving, the auxiliary battery power source supplied to the IGP terminal is cut off. However, the auxiliary battery power source supplied to the IGR terminal is supplied until the Toyota Prius vehicle is stopped and the ignition switch is turned off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P253314	Ignition Switch On/Start Position Circuit Low Circuit Short to Ground or Open	Short to ground or open in IGR terminal circuit (2 trip detection logic).	Instrument Panel Junction Block Wire harness or connector ECM	Does not come on	Engine	A	SAE Code: P2534

MONITOR DESCRIPTION

The ECM stores a DTC when there is no auxiliary battery voltage to the IGR terminal even though there is auxiliary battery voltage to the IGP terminal.

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 1 minute.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P253314.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	READ VALUE USING GTS (IGR)

(a) Read the Data List.

Powertrain > Engine > Data List

Tester Display
IGR

Result	Proceed to
The value of IGR is ON	A
None of the above conditions are met	B

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK TERMINAL VOLTAGE (IGR VOLTAGE)

Pre-procedure1

(a) Disconnect the ECM connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Switch Condition	Specified Condition	Result
A91-39 (IGR) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

REPLACE ECM

3.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - ECM)

Pre-procedure1

(a) Disconnect the ECM connector.

(b) Disconnect the power distribution box assembly connector.

Procedure1

Standard Resistance:

Click Location & Routing(A12,A91) Click Connector(A12) Click Connector(A91)

Tester Connection	Condition	Specified Condition	Result
A12-22 - A91-39 (IGR)	Always	Below 1 Ω	Ω
A12-22 - A91-39 (IGR) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND)

Pre-procedure1

(a) Disconnect the power distribution box assembly connectors.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(K20,K21) Click Connector(K20) Click Connector(K21)

Tester Connection	Condition	Specified Condition	Result
K20-36 - Body ground	Always	Below 1 Ω	Ω
K21-41 - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

ECM/PCM Engine Off Timer Performance Signal Invalid (P261029)

DESCRIPTION

The soak timer operates after the ignition switch is turned off. When a certain amount of time has elapsed since the ignition switch was turned off, the soak timer activates the ECM to perform malfunction checks which can only be performed after the ignition switch is turned off. The soak timer is built into the ECM.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Priority

Note

P261029

ECM/PCM Engine Off Timer Performance Signal Invalid

ECM internal malfunction

(2 trip detection logic)

ECM

Comes on

Engine

SAE Code: P2610

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Once per driving cycle

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up.
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P261029.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

DTC P261029 is stored if an internal ECM problem is detected. In this case, diagnostic not required. ECM replacement is required.

PROCEDURE

1.	REPLACE ECM

HINT:

Click here

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

3.	CHECK WHETHER DTC OUTPUT RECURS (DTC P261029)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) If no pending DTC is output, the repair has been successfully completed.

Powertrain > Engine > Trouble Codes

Post-procedure1

END

Engine Coolant Pump Circuit Short to Battery (P26CA12)

DESCRIPTION

The ECM calculates the necessary cooling amount based on the engine coolant temperature, engine speed and vehicle speed, and controls the engine water pump assembly accordingly. The engine water pump assembly controls the speed of the engine water pump assembly steplessly and optimally based on a duty cycle signal sent by the ECM, which reduces engine warm-up time, improves fuel efficiency and reduces cooling loss.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P26CA12	Engine Coolant Pump Circuit Short to Battery	The operation duty ratio signal (WPO) of the engine water pump assembly is a certain value or more when the engine water pump assembly operation signal is being output (1 trip detection logic).	Short in engine water pump assembly (water inlet housing) circuit Engine water pump assembly (water inlet housing) ECM	Comes on	Engine	A	SAE Code: P26CD

Related Data List

DTC No.	Data List
P26CA12	Coolant Temperature Electric Water Pump Target Speed Electric Water Pump Speed

MONITOR DESCRIPTION

The ECM outputs an operation duty signal (WPO) to steplessly control the speed of the engine water pump assembly. The ECM outputs an operation duty signal (WPO) to the engine water pump assembly and monitors the actual duty signal (WPO) being output. When the actual operation duty signal (WPO) exceeds a certain value when outputting an operation duty signal (WPO) to the engine water pump assembly, the ECM detects a malfunction and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components	Engine water pump assembly
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P26CA12.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
- [A] to [C]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition	Result
C38-3 (SWP) - Body ground	Ignition switch ON	Below 1 V	V

Post-procedure1

(d) None

GO TO STEP 3

2.	INSPECT ECM (INTERNAL CIRCUIT)

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Perform the Active Test using the GTS.

Powertrain > Engine > Active Test

Tester Display
Activate the Electric Water Pump

Procedure1

Standard:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition
C38-3 (SWP) - Body ground	During Active Test	Resistance fluctuates*

HINT:

*: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the SWP terminal will be unstable during the Active Test. If the resistance fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

Post-procedure1

(d) None

REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)

REPLACE ECM

3.	CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - ECM)

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Disconnect the ECM connector.

Procedure1

Standard Resistance:

Click Location & Routing(C38,C53) Click Connector(C38) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C38-3 (SWP) or C53-71 (WPO) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Coolant Pump No Signal (P26CA31)

DESCRIPTION

Refer to DTC P26CA12.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P26CA31	Engine Coolant Pump No Signal	The speed of the engine water pump calculated from the WPI signal is less than 10 rpm (open or short in the WPI circuit) (1 trip detection logic).	Open or short in engine water pump assembly (water inlet housing) circuit Engine water pump assembly (water inlet housing) EFI-MAIN NO. 3 relay ECM	Comes on	Engine	A	SAE Code: P26CA

Related Data List

DTC No.	Data List
P26CA31	Coolant Temperature Electric Water Pump Target Speed Electric Water Pump Speed

MONITOR DESCRIPTION

The ECM receives a frequency signal (WPI) from the engine water pump assembly and calculates the speed of the engine water pump assembly. As the frequency signal (WPI) is 4 Hz when the engine water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the engine water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped. If the engine water pump assembly speed is calculated to be less than 10 rpm, the ECM judges that there is an open or short in the WPI circuit and stores this DTC.

MONITOR STRATEGY

Required Sensors/Components	Engine water pump assembly
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P26CA31.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
- [A] to [C]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P26CA12.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition	Result
C38-2 (NWP) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

GO TO STEP 8

2.	CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - BODY GROUND)

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition	Result
C38-1 (PGND) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Turn the ignition switch ON.

Procedure1

Standard Voltage:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition	Result
C38-4 ( B) - Body ground	Ignition switch ON	11 to 14 V	V

Post-procedure1

(d) None

REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)

4.	INSPECT EFI-MAIN NO. 3 RELAY

Click here

REPLACE EFI-MAIN NO. 3 RELAY

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition	Result
3 (EFI-MAIN NO. 3 relay) - Body ground	Always	11 to 14 V	V

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 3 RELAY)

6.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)

Pre-procedure1

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Procedure1

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
1 (EFI-MAIN NO. 3 relay) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

Pre-procedure1

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the engine water pump assembly (water inlet housing) connector.

Procedure1

Standard Resistance:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition	Result
5 (EFI-MAIN NO. 3 relay) - C38-4 ( B)	Always	Below 1 Ω	Ω
5 (EFI-MAIN NO. 3 relay) or C38-4 ( B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - ECM)

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

Procedure1

(b) Disconnect the ECM connector.

Standard Resistance:

Click Location & Routing(C38,C53) Click Connector(C38) Click Connector(C53)

Tester Connection	Condition	Specified Condition	Result
C38-2 (NWP) - C53-70 (WPI)	Always	Below 1 Ω	Ω
C38-2 (NWP) - C53-70 (WPI) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Coolant Pump Actuator Stuck (P26CB71)

DESCRIPTION

Refer to DTC P26CA12.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P26CB71	Engine Coolant Pump Actuator Stuck	Even though an operation request signal is being output, the engine water pump assembly does not rotate* (1 trip detection logic).	Lack of engine coolant Engine coolant leak Engine water pump assembly (water inlet housing) ECM	Comes on	Engine	B	SAE Code: P26CB

*: As the frequency signal (WPI) is 4 Hz when the engine water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the engine water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped. If there is an open in the WPI circuit, the engine water pump speed will be displayed as 0 rpm.

Related Data List

DTC No.	Data List
P26CB71	Coolant Temperature Electric Water Pump Target Speed Electric Water Pump Speed

MONITOR DESCRIPTION

The ECM receives a frequency signal (WPI) from the engine water pump assembly and calculates the speed of the engine water pump assembly. The ECM outputs an operation duty signal (WPO) to steplessly control the speed of the engine water pump assembly. If the duty signal (WPI) indicates that the engine water pump assembly is stopped even though the ECM is outputting an operation duty signal (WPO), the ECM judges that the engine water pump assembly is stuck and stores this DTC.

As the frequency signal (WPI) is 4 Hz when the engine water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the engine water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped.

MONITOR STRATEGY

Required Sensors/Components	Engine water pump assembly
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P26CB71.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
- [A] to [C]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P26CA12.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P26CB71)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P26CB71 and other DTCs are output	A
P26CB71 is output	B
P26CB71 and P26CE37 are output	C

HINT:

If any DTCs other than P26CB71 are output, troubleshoot those DTCs first.

GO TO DTC CHART

GO TO STEP 2

2.	CHECK ENGINE COOLANT LEVEL IN RESERVOIR TANK

(a) Check that the engine coolant level is between the FULL and LOW lines.

Click here

Result	Proceed to
Engine coolant level is above the LOW line	A
Engine coolant level is below the LOW line	B

GO TO STEP 6

3.	CHECK FOR ENGINE COOLANT LEAKS

(a) Check the areas around the engine and heater for engine coolant leaks.

Click here

HINT:

If the engine oil is cloudy during the engine oil level dipstick check, it means that engine coolant has entered the engine lubrication system.

OK:

No leaks.

GO TO STEP 5

4.	ADD ENGINE COOLANT

(a) Fill the reservoir tank up to the FULL line with engine coolant.

NOTICE:

Make sure not to add engine coolant when the engine is hot.

HINT:

Click here

GO TO STEP 6

5.	REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

(a) Repair any engine coolant leaks.

HINT:

Add engine coolant and perform air bleeding after repair.

6.	PERFORM ACTIVE TEST USING GTS (ACTIVATE THE ELECTRIC WATER PUMP)

(a) According to the display on the GTS, read the Data List while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Activate the Electric Water Pump

Data List Display
Electric Water Pump Speed

Standard:

Active Test Operation	Electric Water Pump Speed
3000 rpm	2000 rpm or higher

GO TO STEP 8

7.	INSPECT ECM (INTERNAL CIRCUIT)

Pre-procedure1

(a) Disconnect the engine water pump assembly (water inlet housing) connector.

(b) Perform the Active Test using the GTS.

Powertrain > Engine > Active Test

Tester Display
Activate the Electric Water Pump

Procedure1

Standard:

Click Location & Routing(C38) Click Connector(C38)

Tester Connection	Condition	Specified Condition
C38-3 (SWP) - Body ground	During Active Test	Resistance fluctuates*

HINT:

Post-procedure1

(d) None

REPLACE ECM

8.	REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)

HINT:

Click here
When replacing any cooling system parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

10.	CHECK WHETHER DTC OUTPUT RECURS (DTC P26CB71)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

HINT:

If no DTC is output, the repair has been successfully completed.

Post-procedure1

END

Engine Coolant Pump Overspeed (P26CE37)

DESCRIPTION

Refer to DTC P26CA12.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P26CE37	Engine Coolant Pump Overspeed	The speed of the engine water pump assembly is a certain value or more when an operation request signal is being output to the engine water pump assembly (1 trip detection logic).	Lack of engine coolant Engine coolant leak Engine water pump assembly (water inlet housing)	Does not come on	Engine	B	SAE Code: P26CE

Related Data List

DTC No.	Data List
P26CE37	Coolant Temperature Electric Water Pump Target Speed Electric Water Pump Speed

MONITOR DESCRIPTION

The ECM monitors the speed of the engine water pump assembly. When the speed becomes a certain value or more, the ECM judges that the speed is abnormally high and stores a DTC (The MIL does not illuminate).

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and maintain an engine speed of 2500 rpm or more for at least 40 seconds [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P26CE37.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.
- If the judgment result is INCOMPLETE, perform steps [C] through [D].
Idle the engine for 5 minutes or more [C].
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system has a malfunction.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

If the engine is run continuously with a low engine coolant level, DTC P26CE37 may be stored.
If the engine coolant level is sufficient but DTC P26CE37 is output, confirm with the customer whether engine coolant was added after the Toyota Prius vehicle had been driven with insufficient engine coolant.
Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P26CE37)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P26CE37 and P26CB71 are output	A
P26CE37 and other DTCs are output	B
P26CE37 is output	C

HINT:

If any DTCs other than P26CE37 are output, troubleshoot those DTCs first.
If both DTC P26CB71 (pump stuck) and P26CE37 (pump overspeed) are stored, perform troubleshooting for DTC P26CB71 first as the engine coolant pump assembly may be stuck.

GO TO DTC P26CB71

GO TO DTC CHART

2.	CHECK ENGINE COOLANT LEVEL IN RESERVOIR TANK

(a) Check that the engine coolant level is between the FULL and LOW lines.

Click here

Result	Proceed to
Engine coolant level is above the LOW line	A
Engine coolant level is below the LOW line	B

GO TO STEP 6

3.	CHECK FOR ENGINE COOLANT LEAKS

(a) Check the areas around the engine and heater for engine coolant leaks.

Click here

HINT:

If the engine oil is cloudy during the engine oil level dipstick check, it means that engine coolant has entered the engine lubrication system.

OK:

No leaks.

GO TO STEP 5

4.	ADD ENGINE COOLANT

(a) Fill the reservoir tank up to the FULL line with engine coolant.

NOTICE:

Make sure not to add engine coolant when the engine is hot.

HINT:

Click here

GO TO STEP 6

5.	REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

(a) Repair any engine coolant leaks.

HINT:

Add engine coolant and perform air bleeding after repair.

6.	BLEED ENGINE COOLANT

HINT:

Bleed air from the cooling system.

Click here

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

8.	CHECK WHETHER DTC OUTPUT RECURS (DTC P26CE37)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P26CB71 is output	B
P26CE37 is output	C

Post-procedure1

END

GO TO DTC P26CB71

9.	BLEED ENGINE COOLANT

(a) Bleed air from the cooling system.

HINT:

Click here

10.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

11.	CHECK WHETHER DTC OUTPUT RECURS (DTC P26CE37)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P26CE37 is output	B

Post-procedure1

END

12.	REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)

HINT:

Click here
When replacing any cooling system parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

13.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

14.	CHECK WHETHER DTC OUTPUT RECURS (DTC P26CE37)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

HINT:

If no DTC is output, the repair has been successfully completed.

Post-procedure1

END

O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold (P2A0026)

DESCRIPTION

Refer to DTC P003012.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P2A0026	O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold	The calculated value for the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic).	Air fuel ratio sensor (sensor 1) Intake system Fuel injector assembly Exhaust gas leak Fuel pump Fuel line EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P2A00

MONITOR DESCRIPTION

After the engine is warmed up, the ECM performs air fuel ratio feedback control to maintain the air fuel ratio at the stoichiometric level. In addition, active air fuel ratio control is performed for approximately 30 seconds after preconditions are met in order to measure the air fuel ratio sensor response rate. During active air fuel ratio control, the ECM forcibly increases and decreases the injection volume by a certain amount, based on the stoichiometric air fuel ratio learned during normal air fuel ratio control, and measures the air fuel ratio sensor response rate. The ECM receives a signal from the air fuel ratio sensor while performing active air fuel ratio control and uses it to calculate the air fuel ratio sensor response rate deterioration level.

If the value for the air fuel ratio sensor response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and stores this DTC.

MONITOR STRATEGY

Required Sensors/Components	Air fuel ratio sensor
Frequency of Operation	Once per driving cycle

TYPICAL ENABLING CONDITIONS

Active air fuel ratio control	Performing
Active air fuel ratio control performed when following conditions met	-
Engine coolant temperature	75°C (167°F) or higher
Idling	Off
Engine speed	1000 rpm or more, and less than 4000 rpm
Air fuel ratio sensor status	Activated
Engine load	10% or higher, and less than 70%
Catalyst monitor	Not yet
Mass air flow	5 gm/sec or more, and less than 14 gm/sec

CONFIRMATION DRIVING PATTERN

HINT:

Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON .
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
With the engine running, drive the Toyota Prius vehicle at a speed between 60 and 100 km/h (37 and 62 mph) for 10 minutes or more in a city area [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P2A0026.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE and no pending DTC is output, perform the following procedure.
With the engine running, drive the Toyota Prius vehicle at a speed between 75 and 100 km/h (47 and 62 mph) for 10 minutes [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P2A0026.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, drive the Toyota Prius vehicle again under an increased load and then recheck the judgment result.

WIRING DIAGRAM

Refer to DTC P003012.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

DTC P2A0026 may be also stored when the air fuel ratio is stuck at rich or lean.
A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A0026)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P2A0026 and other DTCs are output	A
P2A0026 is output	B

HINT:

If any DTCs other than P2A0026 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

HINT:

The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.
The air fuel ratio sensor is displayed as A/F (O2) Sensor Current B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the GTS.
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

GTS Display (Sensor)	Injection Volume	Status	Voltage
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	12.5%	Rich	Below -0.075 mA
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	-12.5%	Lean	Higher than 0.037 mA
O2 Sensor Voltage B1S2 (Heated oxygen)	12.5%	Rich	Higher than 0.55 V
O2 Sensor Voltage B1S2 (Heated oxygen)	-12.5%	Lean	Below 0.4 V

Status of A/F (O2) Sensor Current B1S1	Status of O2 Sensor Voltage B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Proceed to
Lean/Rich	Lean/Rich	Normal	A
Lean	Lean	Actual air fuel ratio lean	B
Rich	Rich	Actual air fuel ratio rich	B
Lean	Lean/Rich	Air fuel ratio sensor malfunction	C
Rich	Lean/Rich	Air fuel ratio sensor malfunction	C

Lean: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently higher than 0.037 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently below 0.4 V.
Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently higher than 0.55 V.
Lean/Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the output voltage of the fuel ratio sensor (A/F (O2) Sensor Current B1S1) or heated oxygen sensor (O2 Sensor Voltage B1S2) alternates correctly.
HINT:

Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1 and O2 Sensor Voltage B1S2].

Click here

Post-procedure1

(e) None

GO TO STEP 7

GO TO STEP 15

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Check the DTC judgment result.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTC is not output)

ABNORMAL

(DTC P2A0026 is output)

Post-procedure1

(d) None

END

5.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (75 mmHg) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result	Proceed to
Intake Manifold Absolute Pressure value is at least 10 kPa (75 mmHg) higher than when EGR valve is fully closed	A
None of the above conditions are met	B

Post-procedure1

(d) None

GO TO STEP 15

6.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

GO TO STEP 15

REPLACE EGR VALVE ASSEMBLY

7.	INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

Click here

REPLACE AIR FUEL RATIO SENSOR

8.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

9.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

REPAIR OR REPLACE EXHAUST SYSTEM

10.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (75 mmHg) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result	Proceed to
Intake Manifold Absolute Pressure value is at least 10 kPa (75 mmHg) higher than when EGR valve is fully closed	A
None of the above conditions are met	B

Post-procedure1

(d) None

GO TO STEP 12

11.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

12.	CHECK FUEL PRESSURE

Click here

GO TO STEP 14

13.	INSPECT FUEL INJECTOR ASSEMBLY

Click here

GO TO STEP 15

REPLACE FUEL INJECTOR ASSEMBLY

14.	INSPECT FUEL PUMP

Click here

REPAIR OR REPLACE FUEL LINE

REPLACE FUEL PUMP

15.	REPLACE AIR FUEL RATIO SENSOR

HINT:

Click here

16.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

17.	CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Check the DTC judgment result.

Powertrain > Engine > Utility

Tester Display
All Readiness

Result

Proceed to

NORMAL

(DTC is not output)

ABNORMAL

(DTC P2A0026 is output)

Post-procedure1

(d) None

END

REPLACE ECM

Poor Engine Power (P319000,P319100)

DESCRIPTION

The ECM receives signals from the hybrid vehicle control ECU such as the requested engine torque, target engine speed and engine cranking status, and controls the engine output based on the target engine speed and requested torque.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P319000	Poor Engine Power	When all of the following conditions are met (1 trip detection logic): The engine speed is 650 rpm or more (varies depending on the engine coolant temperature). Engine torque requested by the hybrid Toyota Prius vehicle control ECU exceeds a certain value. The hybrid vehicle control ECU judges that the engine has started. The fuel tank is not empty. Communication between the hybrid vehicle control ECU and ECM is normal. The actual engine torque is less than 20% of the requested engine torque for 6 seconds, or until the crankshaft rotates 100 times (whichever takes longer, differs depending on the engine coolant temperature).	Intake system Throttle body assembly Fuel system Engine Mass air flow meter sub-assembly Out of fuel Engine coolant temperature sensor Crankshaft position sensor Camshaft position sensor EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P3190
P319100	Engine does not Start	When all of the following conditions are met (1 trip detection logic): The engine speed is 650 rpm or more (varies depending on the engine coolant temperature). The fuel tank is not empty. Communication between the hybrid Toyota Prius vehicle control ECU and ECM is normal. After the hybrid vehicle control ECU sends the engine start request signal, it does not detect engine start (generation of engine torque) for 6 seconds, or until the crankshaft rotates 100 times (whichever takes longer, differs depending on the engine coolant temperature).	Intake system Throttle body assembly Fuel system Engine Mass air flow meter sub-assembly Out of fuel Engine coolant temperature sensor Crankshaft position sensor Camshaft position sensor EGR valve assembly ECM	Comes on	Engine	B	SAE Code: P3191

MONITOR DESCRIPTION

The ECM receives signals such as requested engine torque, target engine speed and engine cranking status from the hybrid Toyota Prius vehicle control ECU.
The ECM controls engine start and stop and the throttle valve angle based on the signals received from the hybrid vehicle control ECU.
The ECM receives the actual engine torque calculated by the hybrid vehicle control ECU based on the generator torque.
When the actual engine torque is less than 20% of the requested engine torque*, the ECM judges that the engine output is abnormal and stores DTC P319000.
(The engine may not have started in the above situation.)
- *: Requested torque = Requested Engine Torque (kW) / HV Target Engine Speed (rpm) x 9549

If the ECM does not detect engine start torque (actual engine torque) even though it has received an engine start request and started the engine, it stores DTC P319100.

HINT:

When DTCs P319000, P319100 and P319300 are output, the engine may be stopped due to the engine condition.
At this time, after adding fuel or performing repairs, clear the DTCs. Then turn the ignition switch off to return to the normal condition.
When this DTC is output and the engine is stopped, the HV battery cannot be charged since the Toyota Prius vehicle is driven with the motor only. If the vehicle continues to be driven under this condition, the HV battery will be come depleted and the ignition switch will not be able to be turned on (READY).
When DTC P319000 or P319100 is stored, the engine torque has dropped by 80% or the engine cannot be started. If any DTCs that indicate malfunctioning of engine related parts are stored at the same time, repair the malfunctioning parts first.
Relevant Data List Items:

If engine knock is detected due to mechanical noise or a knock control sensor being loose, the ignition timing (Knock F/B Value, Knock Correct Learn Value) may be excessively retarded and DTC P319000 may be stored.

ECM (Powertrain / Engine / Data List)
HV Target Engine Speed	Engine Speed	Requested Engine Torque	Actual Engine Torque
Throttle Position Command	Throttle Position Sensor No.1 Voltage	Calculate Load	Coolant Temperature
Short FT B1S1	Long FT B1S1	Target EGR Valve Position No.1	Ignition Timing Cylinder #1
Knock F/B Value	Knock Correct Learn Value	-	-

Hybrid Toyota Prius Vehicle Control ECU (Powertrain / Hybrid Control / Data List)
Target Engine Revolution	Engine Speed	Target Engine Power	Coolant Temperature
Engine Idling Request	-	-	-

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

NOTICE:

If the MIL or a warning light illuminates, immediately end the confirmation driving pattern. If DTCs P319000, P319100 and P319300 are output and the engine is stopped, the HV battery will no longer be chargeable and the distance that the Toyota Prius vehicle can be driven will be limited.

Apply the parking brake firmly.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON (READY).
Fully depress the accelerator pedal for 10 seconds with the Toyota Prius vehicle stopped, park (P) selected and the brake pedal depressed [A].
NOTICE:

As soon as the engine starts, release the accelerator pedal.
Release the parking brake.
Drive the vehicle at an average of approximately 40 km/h (25 mph) or more until the total engine operation time is 10 minutes or more [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- It is not necessary to maintain the Toyota Prius vehicle speed at 40 km/h (25 mph) throughout the road test.
- If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P319000 or P319100.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

Performing this diagnosis procedure repeatedly for symptom confirmation may cause the SOC to drop, preventing the system from entering the READY-on state. In this case, use the THS charger to charge the HV battery.
Cranking the engine once causes the SOC to drop approximately 1%.
Charging the HV battery once (10 minutes) using the THS charger restores the SOC approximately 2%.
Charging the HV battery using the THS charger takes approximately 10 minutes when the HV battery temperature is 25°C (77°F) or approximately 30 minutes when the HV battery temperature is 0°C (32°F).
The THS charger is a supplemental charging device that charges the HV battery enough to enable the engine to start (the Toyota Prius vehicle can enter the READY-on state).

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P319000, P319100 AND/OR P319300)

(a) Check for DTCs and freeze frame data and write them down.

Powertrain > Engine > Trouble Codes

Result	Proceed to
P319000, P319100 or P319300 and other DTCs are output	A
P319300 is output	B
P319000 or P319100 is output	C

HINT:

If any SFI system DTCs other than DTC P319000, P319100 or P319300 are output, perform troubleshooting for those DTCs first.

GO TO DTC CHART

GO TO DTC P319300

2.	CHECK SHORTAGE OF FUEL

(a) Check the amount of fuel remaining.

OK:

There is enough fuel.

HINT:

DTCs P319000, P319100 and/or P319300 may be output if the Toyota Prius vehicle ran out of fuel in the past.
If not enough fuel is added, DTC P319000, P319100 or P319300 may be output again. If the engine cannot be started because the vehicle is out of fuel, add fuel until the fuel level warning light turns off.

REFILL FUEL

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

REPAIR OR REPLACE INTAKE SYSTEM

5.	CHECK FOR UNUSUAL NOISE OR VIBRATION WHEN STARTING ENGINE OR REVVING

OK:

Unusual noise and vibration do not occur.

REPAIR OR REPLACE MALFUNCTIONING PARTS

6.	CHECK FUEL PRESSURE

Click here

CHECK FUEL PUMP CONTROL CIRCUIT

7.	INSPECT THROTTLE BODY ASSEMBLY

Click here

REPLACE THROTTLE BODY ASSEMBLY

8.	INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

(a) Inspect the mass air flow meter sub-assembly, referring to On-Toyota Prius vehicle Inspection for Mass Air Flow Meter.

Click here

(b) Inspect the mass air flow meter sub-assembly, referring to Inspection for Mass Air Flow Meter.

Click here

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

9.	INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Click here

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

10.	REPLACE CRANKSHAFT POSITION SENSOR

HINT:

Click here

11.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

12.	CHECK WHETHER DTC OUTPUT RECURS (DTC P319000 OR P319100)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P319000 or P319100 is output	B

Post-procedure1

END

13.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Pre-procedure1

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

HINT:

The A/C switch and all accessories should be off.

Procedure1

(c) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
If the Active Test cannot be performed due to a malfunction such as the engine not starting, perform the EGR valve assembly inspection the following step.

Result	Proceed to
Intake Manifold Absolute Pressure value is at least 10 kPa (1.45 psi) higher than when EGR valve is fully closed	A
None of the above conditions are met	B

Post-procedure1

(d) None

GO TO STEP 15

14.	INSPECT EGR VALVE ASSEMBLY

Pre-procedure1

(a) Remove the EGR valve assembly.

HINT:

Click here

Procedure1

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

Post-procedure1

REPLACE EGR VALVE ASSEMBLY

15.	REPLACE CAMSHAFT POSITION SENSOR

HINT:

Click here

16.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

17.	CHECK WHETHER DTC OUTPUT RECURS (DTC P319000 OR P319100)

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P319000 or P319100 is output	B

Post-procedure1

END

18.	REPLACE ECM

HINT:

Click here

19.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

20.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Post-procedure1

END

Fuel Run Out (P319300)

DESCRIPTION

The ECM receives the low fuel level signal from the combination meter assembly (meter ECU) to detect if the vehicle is running out of fuel.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P319300	Fuel Run Out	All of the following conditions are met (1 trip detection logic): Ignition switch ON. The ECM receives the fuel empty low level signal from the combination meter assembly (meter ECU). DTC detection conditions of either DTC P319000 or P319100 are met.	- (This DTC indicates that the Toyota Prius vehicle ran out of fuel and does not indicate the malfunction of part.)	Does not come on	Engine	A	SAE Code: P3193

MONITOR DESCRIPTION

This DTC indicates that the Toyota Prius vehicle ran out of fuel. If the ECM receives the low fuel level signal from the combination meter assembly (meter ECU) and the DTC detection conditions of either DTC P319000 or P319100 are met while the ignition switch is ON or the engine is operating, the ECM stores this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

NOTICE:

If the MIL or a warning light illuminates, immediately end the confirmation driving pattern. When DTCs P319000, P319100 and P319300 are output, the engine may stop. In this case, the HV battery will no longer be chargeable and the distance that the Toyota Prius vehicle can be driven will be limited.

Apply the parking brake firmly.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON (READY).
Fully depress the accelerator pedal for 10 seconds with the Toyota Prius vehicle stopped, park (P) selected and the brake pedal depressed [A].
NOTICE:

As soon as the engine starts, release the accelerator pedal.
Release the parking brake.
Drive the vehicle at an average of approximately 40 km/h (25 mph) or more until the total engine operation time is 10 minutes or more [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- It is not necessary to maintain the Toyota Prius vehicle speed at 40 km/h (25 mph) throughout the road test.
- If the engine stops, further depress the accelerator pedal to restart the engine.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P319300.
Check the DTC judgment result.
HINT:

If the judgment result is INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

HINT:

When DTCs P319000, P319100 and P319300 are output, the engine may stop.
In this case, after adding fuel or performing repairs, clear the DTCs. Then turn the ignition switch off to return to the normal condition.
When this DTC is output and the engine is stopped, the HV battery cannot be charged since the Toyota Prius vehicle is driven with the motor only. If the vehicle continues to be driven under this condition, the HV battery will become depleted and the ignition switch will not be able to be turned ON (READY).

PROCEDURE

1.	CHECK SHORTAGE OF FUEL

(a) Check the amount of fuel remaining.

OK:

There is enough fuel.

HINT:

DTCs P319000, P319100 and/or P319300 may be output if the Toyota Prius vehicle ran out of fuel in the past.
If not enough fuel is added, DTC P319000, P319100 or P319300 may be output again. If the engine cannot be started because the vehicle is out of fuel, add fuel until the fuel level warning light turns off.

GO TO STEP 3

2.	REFILL FUEL

(a) Add fuel until the fuel level warning light turns off.

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs

Post-procedure1

4.	CHECK WHETHER DTC OUTPUT RECURS

Pre-procedure1

(a) Drive the Toyota Prius vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Procedure1

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
P319000 or P319100 is output	B
P319000 or P319100 and other DTCs are output	C

Post-procedure1

END

GO TO DTC P319000, P319100

GO TO DTC CHART

Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)

MONITOR DESCRIPTION

The ECM and inverter with converter assembly (MG ECU) send and receive signals via CAN communication.

If a communication error occurs between the ECM and inverter with converter assembly, the ECM illuminates the MIL and stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
U011087	Lost Communication with Drive Motor Control Module "A" Missing Message	All of the following conditions are met for 5.6 seconds or more (1 trip detection logic): Ignition switch ON Auxiliary battery voltage is 10 V or higher No communication between ECM and inverter with converter assembly	CAN communication system Inverter with converter assembly ECM	Comes on	Engine	B	SAE Code: U0110

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 6 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: U011087.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

HINT:

Click here

END

Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message (U011187)

MONITOR DESCRIPTION

The ECM and battery energy control module send and receive signals via CAN communication.

If a communication error occurs between the ECM and battery energy control module, the ECM illuminates the MIL and stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
U011187	Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message	All of the following conditions are met for 50.6 seconds or more (1 trip detection logic): Ignition switch ON Auxiliary battery voltage is 10 V or higher No communication between ECM and battery energy control module	CAN communication system Battery energy control module ECM	Comes on	Engine	B	SAE Code: U0111

MONITOR STRATEGY

Required Sensors/Components (Main)	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Wait 1 minute or more.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: U011187.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system is malfunctioning.
- [A] to [B]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

HINT:

Click here

END

Lost Communication With Hybrid Powertrain Control Module Missing Message (U029387)

MONITOR DESCRIPTION

The ECM and hybrid vehicle control ECU send and receive signals via CAN communication.

If a communication error occurs between the ECM and hybrid vehicle control ECU, the ECM illuminates the MIL and stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
U029387	Lost Communication With Hybrid Powertrain Control Module Missing Message	All of the following conditions are met for 0.656 seconds or more (1 trip detection logic): Ignition switch ON Auxiliary battery voltage is 10 V or higher No communication between ECM and hybrid Toyota Prius vehicle control ECU	CAN communication system Hybrid vehicle control ECU ECM	Comes on	Engine	B	SAE Code: U0293

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: U029387.
Check the DTC judgment result.
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

HINT:

Click here

END

Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message (U115087)

MONITOR DESCRIPTION

The ECM and hybrid vehicle control ECU assembly send and receive signals via CAN communication.

If a communication error occurs between the ECM and hybrid vehicle control ECU assembly, the ECM illuminates the MIL and stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
U115087	Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message	All of the following conditions are met for 0.576 seconds or more (1 trip detection logic): Ignition switch ON Auxiliary battery voltage is 10 V or higher No communication between ECM and hybrid Toyota Prius vehicle control ECU assembly	CAN communication system Hybrid vehicle control ECU assembly ECM	Comes on	Engine	B	SAE Code: U1150

MONITOR STRATEGY

Required Sensors/Components	ECM
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch ON [A].
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: U115087.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system is malfunctioning.
- [A] to [B]: Normal judgment procedure.
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

Toyota Prius Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Toyota Prius Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Toyota Prius Vehicle Control History.
Click here

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

HINT:

Click here

END

ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned ON, auxiliary battery voltage is applied to the IGP terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the No. 1 integration relay (EFI-MAIN relay), closing the contacts of the EFI-MAIN relay and supplying power to terminals B and B2 of the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Condition	Specified Condition
A91-17 (E1) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)

(a) Disconnect the ECM connector.

(b) Turn the ignition switch ON.

Standard Voltage:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Condition	Specified Condition
A91-41 (IGP) - Body ground	Ignition switch ON	11 to 14 V

GO TO STEP 6

3.	INSPECT EFI-MAIN NO. 1 RELAY

Click here

REPLACE EFI-MAIN NO. 1 RELAY

4.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM)

(a) Remove the EFI-MAIN NO. 1 relay, EFI-MAIN NO.2 relay and EFI-MAIN NO.3 relayfrom the No. 1 engine room relay block and No. 1 junction block assembly.

HINT:

Remove the EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 relay connected between the checked terminals as the coil inside the relay influences the measurement value.

(b) Disconnect the ECM connector.

Standard Resistance:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Condition	Specified Condition
2 (EFI-MAIN NO. 1 relay) - A91-27 (MREL)	Always	Below 1 Ω
5 (EFI-MAIN NO. 1 relay) - A91-2 ( B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 1 relay) - A91-3 ( B2)	Always	Below 1 Ω
2 (EFI-MAIN NO. 1 relay) or A91-27 (MREL) - Body ground and other terminals	Always	10 kΩ or higher
5 (EFI-MAIN NO. 1 relay), A91-2 ( B) or A91-3 ( B2) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)

(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (EFI-MAIN NO. 1 relay) - Body ground	Always	11 to 14 V
1 (EFI-MAIN NO. 1 relay) - Body ground	Always	11 to 14 V

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 1 RELAY)

6.	INSPECT IGP RELAY

Click here

REPLACE IGP RELAY

7.	CHECK HARNESS AND CONNECTOR (IGP RELAY - ECM)

(a) Disconnect the ECM connector.

(b) Remove the IGP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Standard Resistance:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Condition	Specified Condition
3 (IGP relay) - A91-41 (IGP)	Always	Below 1 Ω
3 (IGP relay) or A91-41 (IGP) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGP RELAY)

(a) Remove the IGP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
5 (IGP relay) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - IGP RELAY)

9.	CHECK HARNESS AND CONNECTOR (IGP RELAY - BODY GROUND)

(a) Remove the IGP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (IGP relay) - Body ground	Always	Below 1 Ω

Result	Proceed to
OK	A
NG	B

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IGP RELAY)

(a) Disconnect the certification ECU (smart key ECU assembly) connector.

(b) Remove the IGP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

Standard Resistance:

Click Location & Routing(K23) Click Connector(K23)

Tester Connection	Condition	Specified Condition
K23-24 (IGPD) - 2 (IGP relay)	Always	Below 1 Ω
K23-24 (IGPD) or 2 (IGP relay) - Body ground and other terminals	Always	10 kΩ or higher

GO TO SMART KEY SYSTEM

REPAIR OR REPLACE HARNESS OR CONNECTOR

VC Output Circuit

DESCRIPTION

The ECM constantly generates 5 V power source voltage from the auxiliary battery voltage supplied to the B, B2 (BATT) terminal of the ECM to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.

When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.

HINT:

Under normal conditions, the MIL is illuminated when the ignition switch is turned ON. The MIL goes off when the ignition switch is turned ON (READY).

WIRING DIAGRAM

For the circuit diagram of the ECM power source refer to the ECM power source circuit.
Click here
VC Output Circuit

CAUTION / NOTICE / HINT

NOTICE:

Check the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

CHECK GTS

(a) Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is not possible	A
Communication is possible	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK EFI NO. 2 FUSE VOLTAGE

(a) Turn the ignition switch ON.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
1 (EFI NO. 2 fuse) - Body ground	Ignition switch ON	11 to 14 V

HINT:

Check the fuse with it installed to the No. 1 engine room relay block and No. 1 junction block assembly.
If the result is not as specified, since current is not flowing to the B and B2 terminals of the ECM, the system may not be started.

GO TO ECM POWER SOURCE CIRCUIT

3.	CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR)

(a) Disconnect the throttle body assembly connector.

(b) Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is not possible	A
Communication is possible	B

REPLACE THROTTLE BODY ASSEMBLY

4.	CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR)

(a) Disconnect the camshaft position sensor connector.

(b) Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is not possible	A
Communication is possible	B

REPLACE CAMSHAFT POSITION SENSOR

5.	CHECK CONNECTION BETWEEN GTS AND ECM (MANIFOLD ABSOLUTE PRESSURE SENSOR)

(a) Disconnect the manifold absolute pressure sensor connector.

(b) Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is not possible	A
Communication is possible	B

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

6.	CHECK CONNECTION BETWEEN TECHSTREAM AND ECM (CRANKSHAFT POSITION SENSOR)

(a) Disconnect the crankshaft position sensor connector.

(b) Check the communication between the Techstream and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is not possible	A
Communication is possible	B

REPLACE CRANKSHAFT POSITION SENSOR

7.	CHECK CONNECTION BETWEEN TECHSTREAM AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY)

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Check the communication between the Techstream and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is not possible	A
Communication is possible	B

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

8.	CHECK HARNESS AND CONNECTOR

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the camshaft position sensor connector.

(d) Disconnect the crankshaft position sensor connector.

(e) Disconnect the mass air flow meter sub-assembly connector.

(f) Disconnect the ECM connectors.

(g) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C53,A91) Click Connector(C53) Click Connector(A91)

Tester Connection	Condition	Specified Condition
C53-134 (VCTA) - Body ground	Always	10 kΩ or higher
C53-114 (VCV1) - Body ground	Always	10 kΩ or higher
C53-89 (VCPM) - Body ground	Always	10 kΩ or higher
C53-82 (VCNE) - Body ground	Always	10 kΩ or higher
C53-108 (VCVG) - Body ground	Always	10 kΩ or higher
A91-2 ( B) - 1 (EFI NO. 2 fuse)	Always	Below 1 Ω
A91-3 ( B2) - 1 (EFI NO. 2 fuse)	Always	Below 1 Ω

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Fuel Pump Control Circuit

DESCRIPTION

When the engine is being cranked, the start request signal output from the hybrid vehicle control ECU is input to the ECM, and the NE signal generated by the crankshaft position sensor is also input to the ECM. Thus, the ECM interprets that the engine is being cranked, and turns an internal transistor on, causing current to flow to the C/OPN relay. The fuel pump then operates the NE signal is input into the ECM with the engine running, the ECM keeps the transistor on.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY)

(a) Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

Powertrain > Engine > Active Test

Tester Display
Activate the Circuit Relay

(b) According to the display on the GTS, perform the Active Test and check that fuel pump operating sounds can be heard.

OK:

Operating sounds can be heard from the fuel pump.

GO TO STEP 3

2.	READ VALUE USING GTS (ENGINE SPEED)

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

Powertrain > Engine > Data List

Tester Display
Engine Speed

OK:

Values are displayed continuously.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

CHECK CRANKSHAFT POSITION SENSOR CIRCUIT

3.	INSPECT C/OPN RELAY

(a) Inspect the C/OPN relay.

Click here

REPLACE C/OPN RELAY

4.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)

(a) Remove the C/OPN relay from the No. 2 relay block assembly.

(b) Turn the ignition switch ON.

Standard Voltage:

Tester Connection	Condition	Specified Condition
1 (C/OPN relay) - Body ground	Ignition switch ON	11 to 14 V
3 (C/OPN relay) - Body ground	Ignition switch ON	11 to 14 V

GO TO STEP 9

5.	CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

(a) Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly

(b) Disconnect the ECM connector.

Standard Resistance:

Click Location & Routing(A91) Click Connector(A91)

Tester Connection	Condition	Specified Condition
2 (C/OPN relay) - A91-29 (FC)	Always	Below 1 Ω
2 (C/OPN relay) or A91-29 (FC) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)

(a) Remove the C/OPN relay from No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the fuel pump connector.

Standard Resistance:

Click Location & Routing(R49) Click Connector(R49)

Tester Connection	Condition	Specified Condition
5 (C/OPN relay) - R49-4 (B)	Always	Below 1 Ω
5 (C/OPN relay) or R49-4 (B) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

(a) Disconnect the fuel pump connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(R49) Click Connector(R49)

Tester Connection	Condition	Specified Condition
R49-5 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT FUEL PUMP

(a) Inspect the fuel pump.

Click here

REPLACE ECM

REPLACE FUEL PUMP

9.	CHECK HARNESS AND CONNECTOR (IGP RELAY - C/OPN RELAY)

(a) Remove the IGP relay from the y.No. 1 engine room relay block and No. 1 junction block assembly.

(b) Remove the C/OPN relay from the .No. 1 engine room relay block and No. 1 junction block assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (IGP) - 1 (C/OPN relay)	Always	Below 1 Ω
3 (IGP) or 1 (C/OPN relay) - Body ground and other terminals	Always	10 kΩ or higher

HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - C/OPN RELAY)

(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 junction block and No. 1 relay block assembly.

(b) Remove the C/OPN relay from the .No. 1 engine room relay block and No. 1 junction block assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (EFI-MAIN NO. 1) - 3 (C/OPN relay)	Always	Below 1 Ω
5 (EFI-MAIN NO. 1) or 3 (C/OPN relay) - Body ground and other terminals	Always	10 kΩ or higher

HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

GO TO ECM POWER SOURCE CIRCUIT

REPAIR OR REPLACE HARNESS OR CONNECTOR

Fuel Injector Circuit

DESCRIPTION

The fuel injector assemblies are located in each intake port and inject fuel into the cylinders based on the signals from the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

(a) Disconnect the fuel injector assembly connector.

(b) Turn the ignition switch ON.

Standard Voltage:

Click Location & Routing(C30,C31,C32,C33) Click Connector(C30) Click Connector(C31) Click Connector(C32) Click Connector(C33)

Tester Connection	Condition	Specified Condition
C30-1 (#1) - Body ground	Ignition switch ON	11 to 14 V
C31-1 (#2) - Body ground	Ignition switch ON	11 to 14 V
C32-1 (#3) - Body ground	Ignition switch ON	11 to 14 V
C33-1 (#4) - Body ground	Ignition switch ON	11 to 14 V

GO TO STEP 4

2.	INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

(a) Inspect the fuel injector assembly.

Click here

REPLACE FUEL INJECTOR ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

(a) Disconnect the fuel injector assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Click Location & Routing(C30,C53,C31,C32,C33) Click Connector(C30) Click Connector(C53) Click Connector(C31) Click Connector(C32) Click Connector(C33)

Tester Connection	Condition	Specified Condition
C30-2 (#10) - C53-34 (#10)	Always	Below 1 Ω
C31-2 (#20) - C53-35 (#20)	Always	Below 1 Ω
C32-2 (#30) - C53-36 (#30)	Always	Below 1 Ω
C33-2 (#40) - C53-37 (#40)	Always	Below 1 Ω
C30-2 (#10) or C53-34 (#10) - Body ground and other terminals	Always	10 kΩ or higher
C31-2 (#20) or C53-35 (#20) - Body ground and other terminals	Always	10 kΩ or higher
C32-2 (#30) or C53-36 (#30) - Body ground and other terminals	Always	10 kΩ or higher
C33-2 (#40) or C53-37 (#40) - Body ground and other terminals	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (IGP RELAY - FUEL INJECTOR ASSMBLY)

(a) Disconnect the IGP relay from No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the fuel injector assembly connector.

Standard Resistance:

Click Location & Routing(C30,C32,C33,C31) Click Connector(C30) Click Connector(C32) Click Connector(C33) Click Connector(C31)

Tester Connection	Condition	Specified Condition
3 (IGP relay) - C30-1 (#1)	Always	Below 1 Ω
3 (IGP relay) - C3-1 (#2)	Always	Below 1 Ω
3 (IGP relay) - C32-1 (#3)	Always	Below 1 Ω
3 (IGP relay) - C33-1 (#4)	Always	Below 1 Ω
3 (IGP relay) or C30-1 (#1) - Body ground and other terminals	Always	10 kΩ or higher
3 (IGP relay) or C31-1 (#2) - Body ground and other terminals	Always	10 kΩ or higher
3 (IGP relay) or C32-1 (#3) - Body ground and other terminals	Always	10 kΩ or higher
3 (IGP relay) or C33-1 (#4) - Body ground and other terminals	Always	10 kΩ or higher

HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

GO TO ECM POWER SOURCE CIRCUIT

REPAIR OR REPLACE HARNESS OR CONNECTOR

MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM.

The MIL operation can be checked visually. When the ignition switch is turned ON, the MIL should be illuminated and should then turn off after the ignition switch is turned ON (READY). If the MIL remains illuminated or does not illuminate, conduct the following troubleshooting procedure.

WIRING DIAGRAM

PROCEDURE

1.	CHECK THAT MIL IS ILLUMINATED

(a) Perform troubleshooting in accordance with the table below.

MIL	Condition	Proceed to
Illuminates → Turns off	Ignition switch ON → Ignition switch ON (READY)	A
Other than above	-	B

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK COMMUNICATION BETWEEN GTS AND ECM

(a) Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.

Result	Proceed to
Communication is possible	A
Communication is not possible	B

GO TO VC OUTPUT CIRCUIT

3.	CHECK WHETHER DTC OUTPUT RECURS

(a) Enter the following menus: System Select / Health Check.

(b) Check if any DTCs have been detected. Note down any DTCs.

Result	Proceed to
DTCs are not output	A
DTCs are output	B

HINT:

Check for detected DTCs output from other ECUs which relate to the MIL.

REPAIR CIRCUIT INDICATED BY OUTPUT

4.	PERFORM ACTIVE TEST USING GTS

(a) Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Warning.

Body Electrical > Combination Meter > Active Test

Tester Display
Check Engine Warning

(b) According to the display on the GTS, perform the Active Test and check the operation of the MIL.

Result	Proceed to
Changes	A
Does not change	B

REPLACE ECM

REPLACE COMBINATION METER ASSEMBLY

Ignition Circuit

DESCRIPTION

A direct ignition system is used on this vehicle. The direct ignition system is a 1 cylinder ignition system which ignites one cylinder with one ignition coil. In the 1 cylinder ignition system, one spark plug is connected to the end of the secondary winding. High voltage is generated in the secondary winding and is applied directly to the spark plug. The spark of the spark plug passes from the center electrode to the ground electrode.

The ECM determines the ignition timing and transmits the ignition signals for each cylinder. Using the ignition signal, the ECM turns on and off the power transistor inside the igniter, which switches on and off a current to the primary coil. When the current to the primary coil is cut off, high voltage is generated in the secondary coil and this voltage is applied to the spark plugs to create sparks inside the cylinders.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Perform a spark test before proceeding. If there is no spark for any cylinder, inspect this circuit.

Click here

PROCEDURE

1.	CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY)

(a) Disconnect the ignition coil assembly connectors.

(b) Turn the ignition switch ON.

Standard Voltage:

Click Location & Routing(C13,C14,C15,C16) Click Connector(C13) Click Connector(C14) Click Connector(C15) Click Connector(C16)

Tester Connection	Condition	Specified Condition
C13-1 ( B) - C13-3 (GND)	Ignition switch ON	11 to 14 V
C14-1 ( B) - C14-3 (GND)	Ignition switch ON	11 to 14 V
C15-1 ( B) - C15-3 (GND)	Ignition switch ON	11 to 14 V
C16-1 ( B) - C16-3 (GND)	Ignition switch ON	11 to 14 V

GO TO STEP 3

2.	CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

(a) Disconnect the ignition coil assembly connectors.

(b) Disconnect the ECM connector.

Standard Resistance:

Click Location & Routing(C13,C53,C14,C15,C16) Click Connector(C13) Click Connector(C53) Click Connector(C14) Click Connector(C15) Click Connector(C16)

Tester Connection	Condition	Specified Condition
C13-2 (IGT1) - C53-75 (IGT1)	Always	Below 1 Ω
C14-2 (IGT2) - C53-74 (IGT2)	Always	Below 1 Ω
C15-2 (IGT3) or C53-73 (IGT3)	Always	Below 1 Ω
C16-2 (IGT4) or C53-72 (IGT4)	Always	Below 1 Ω
C13-2 (IGT1) - C53-75 (IGT1) - Body ground and other terminals	Always	10 kΩ or higher
C14-2 (IGT2) - C53-74 (IGT2) - Body ground and other terminals	Always	10 kΩ or higher
C15-2 (IGT3) or C53-73 (IGT3) - Body ground and other terminals	Always	10 kΩ or higher
C16-2 (IGT4) or C53-72 (IGT4) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND)

(a) Disconnect the ignition coil assembly connectors.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(C13,C14,C15,C16) Click Connector(C13) Click Connector(C14) Click Connector(C15) Click Connector(C16)

Tester Connection	Condition	Specified Condition
C13-3 (GND) - Body ground	Always	Below 1 Ω
C14-3 (GND) - Body ground	Always	Below 1 Ω
C15-3 (GND) - Body ground	Always	Below 1 Ω
C16-3 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (IGP RELAY - IGNITION COIL ASSEMBLY)

(a) Disconnect the IGP relay from No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the ignition coil assembly connectors.

Standard Resistance:

Click Location & Routing(C13,C14,C15,C16) Click Connector(C13) Click Connector(C14) Click Connector(C15) Click Connector(C16)

Tester Connection	Condition	Specified Condition
3 (IGP relay) - C13-1 ( B)	Always	Below 1 Ω
3 (IGP relay) - C14-1 ( B)	Always	Below 1 Ω
3 (IGP relay) - C15-1 ( B)	Always	Below 1 Ω
3 (IGP relay) - C16-1 ( B)	Always	Below 1 Ω
3 (IGP relay) or C13-1 ( B) - Body ground and other terminals	Always	10 kΩ or higher
3 (IGP relay) or C14-1 ( B) - Body ground and other terminals	Always	10 kΩ or higher
3 (IGP relay) or C15-1 ( B) - Body ground and other terminals	Always	10 kΩ or higher
3 (IGP relay) or C16-1 ( B) - Body ground and other terminals	Always	10 kΩ or higher

GO TO ECM POWER SOURCE CIRCUIT

REPAIR OR REPLACE HARNESS OR CONNECTOR

Rough Idling

DESCRIPTION

Problem Symptom	Suspected Area	Trouble Area
Engine speed fluctuation due to abnormal combustion Idle speed too low or high Strong engine vibration due to above symptoms	Ignition malfunction Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply) Insufficient compression Changes in load from another system	Spark plug Ignition coil assembly	Ignition system
		Fuel injector assembly Fuel pump Fuel pump control circuit Fuel line Purge VSV system Fuel quality (existence of foreign matter, degradation)	Fuel system
		EGR system Mass air flow meter sub-assembly Intake system (Air leaks or deposit accumulation) Throttle body assembly Air fuel ratio sensor Heated oxygen sensor Camshaft timing oil control valve assembly Variable Valve Timing system (VVT system)	Intake and exhaust systems
		ECM Wire harness or connector Knock control sensor Engine coolant temperature sensor	Other control systems
		Thermostat Engine assembly Engine mount	Engine

HINT:

If any DTCs are output, perform troubleshooting for the DTCs first.
Try to reproduce the conditions present when the malfunction occurred.
Using the GTS, read the Data List to confirm the engine operating conditions. This information can be useful when troubleshooting.
If the problem symptoms do not recur, attempt to reproduce the symptoms and conditions when the malfunction occurred based on the result of the customer problem analysis. Place the priority on confirming the symptoms.

SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION

HINT:

The following are descriptions of the characteristics of each system malfunction. After understanding the link between the causes and symptoms, perform the inspection of each component. Even if the problem symptom does not recur, signs of the malfunction may be found in the Data List.

(a) Ignition system

Spark plug

Main cause of malfunction	Performance degradation (wear, existence of foreign matter, etc.)
Symptom	Engine speed fluctuation due to abnormal combustion
Data List	Misfire Count Cylinder #1 to #4
HINT: If the spark plug of the malfunctioning cylinder is abnormally wet with fuel, a leaking fuel injector assembly is suspected.

Ignition coil assembly

Main cause of malfunction	Internal malfunction
Problem symptom	Engine speed fluctuation due to abnormal combustion
Data List	Misfire Count Cylinder #1 to #4

(b) Fuel system

Fuel injector assembly

Main cause of malfunction	Blockage
Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high
Data List	Short FT B1S1 Long FT B1S1 Total FT Bank 1 Fuel System Status Bank 1 Target Air-Fuel Ratio A/F (O2) Lambda Sensor B1S1 A/F Learn Value Idle Bank 1 A/F Learn Value Low Bank 1 A/F Learn Value Mid No.1 Bank 1 A/F Learn Value Mid No.2 Bank 1 A/F Learn Value High Bank 1
HINT: If the engine malfunction disappears when the fuel injection volume is increased or decreased by performing the Active Test "Control the Injection Volume" or "Control the Injection Volume for A/F Sensor", the respective cylinder may be malfunctioning.

Fuel system

HINT:

If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel pump or fuel filter is suspected.

Fuel quality

Main cause of malfunction	Fuel degradation due to age or water contamination Low fuel quality Addition of fuel additive
Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high Engine is difficult to start

EGR system

Main cause of malfunction	EGR valve movement problems or stuck
Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high Startability malfunction, lack of power or engine stalls
Data List	Target EGR Valve Position No. 1 Normally, Actual EGR Position = Target EGR Valve Position No. 1 /-5% (fully closed: 0%, fully open: 100%) When the ignition switch is turned ON, the EGR valve fully closes. Clogged EGR Port Imbalance Ratio

Mass air flow meter sub-assembly

Main cause of malfunction	Performance degradation (existence of foreign matter, etc.)
Problem symptom	Lack of power
Data List	Mass Air Flow Sensor
HINT: If the value of the Data List item "Mass Air Flow Sensor" is abnormal, a malfunction of the mass air flow meter sub-assembly is suspected.

Throttle system

Main cause of malfunction	Inappropriate trim volume adjustment due to accumulation of deposits
Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high
Data List	Engine Stall Control F/B Flow ISC Learning Value

Air fuel ratio sensor, Heated oxygen sensor

Main cause of malfunction	Deviation in sensor characteristics
Problem symptom	Abnormal combustion due to deviation of actual air fuel ratio from calculated ratio
Data List	A/F (O2) Sensor Voltage B1S1 O2 Sensor Voltage B1S2 Fuel System Status Bank 1

(d) Engine

Engine assembly

Main cause of malfunction	Compression loss Accumulation of deposits (Combustion chamber, intake valve or intake manifold)
Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high Hesitation during acceleration or stalling
HINT: If deposits have accumulated in the combustion chamber or on an intake valve, the engine may stall when deposits are caught on an intake valve. When performing the Active Test "Check the Cylinder Compression", if the speed of one cylinder is higher than the others, the cylinder may have compression loss. If deposits accumulate on the intake valves, the supply of fuel may be delayed due to adherence of the fuel to the deposits, causing a rough idle.

DATA LIST ITEMS RELATED TO ROUGH IDLING

HINT:

Depending on the Toyota Prius vehicle model, the applicable Data List items may vary. Data List items other than the ones used in the diagnostic procedure are for reference only.

Mass Air Flow Sensor
Engine Stall Control F/B Flow
Target Air-Fuel Ratio
A/F (O2) Lambda Sensor B1S1
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2
Short FT B1S1
Long FT B1S1
Total FT Bank 1
Fuel System Status Bank 1
Target EGR Valve Position No.1
A/F Learn Value Idle Bank 1
A/F Learn Value Low Bank 1
A/F Learn Value Mid No.1 Bank 1
A/F Learn Value Mid No.2 Bank 1
A/F Learn Value High Bank 1
Misfire Count Cylinder #1 to #4
ISC Learning Value

PROCEDURE

1.	INTERVIEW THE CUSTOMER

(a) Interview the customer for details about the conditions when the rough idle occurred.

HINT:

Depending on the conditions when the rough idle occurred, a malfunction in one of the following areas is suspected.

Problem Symptom	Suspected Area
Engine runs rough, particularly when idling after a coil start. Engine runs less rough when the engine speed is increased	Possibly caused by excessive EGR due to insufficient closing of the EGR valve
Hesitation or lack of power occurs during acceleration, regardless of whether engine is cold or warm	For low mileage Toyota Prius vehicles (ODO reading of less than approximately 20000 km (12428 miles) or yearly mileage of less than 2000 km (1243 miles)): Fuel quality (degradation, water contamination, etc.) For high mileage vehicles (ODO reading of more than approximately 150000 km (93210 miles)): Excessively lean air fuel ratio during acceleration due to deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve or adherence of fuel to the deposits Abnormal mass air flow meter sub-assembly output due to existence of foreign matter Decrease in fuel injector assembly injection volume due to low quality fuel
Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm	Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

2.	CHECK DTC OUTPUT

(a) Perform a road test.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs is output	B

GO TO DTC CHART

3.	SYMPTOM CONFIRMATION

(a) Check if the problem symptoms reported in the customer problem analysis recur.

HINT:

If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.

Result	Proceed to
The problem symptom recurs	A
The problem symptom does not recur (occurred in the past)	B

CHECK FOR INTERMITTENT PROBLEMS

4.	READ VALUE USING GTS (ISC LEARNING VALUE)

(a) Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value.

Powertrain > Engine > Data List

Tester Display
ISC Learning Value

(b) According to the display on the GTS, read the Data List.

Result	Proceed to
-5 to 10 Nm	A
Other than above	B

GO TO STEP 18

5.	READ VALUE USING GTS (SHORT FT B1S1 AND LONG FT B1S1)

(a) Enter the following menus: Powertrain / Engine / Data List / Short FT B1S1 and Long FT B1S1.

Powertrain > Engine > Data List

Tester Display
Short FT B1S1
Long FT B1S1

(b) Read the value displayed on the GTS, read the Data List.

Data List	Result	Proceed to
Short FT B1S1 Long FT B1S1	-20% or higher, or less than 20%	A
Short FT B1S1 Long FT B1S1	Other than above	B

HINT:

"Total FT Bank 1" is used to detect an abnormal air fuel ratio. As the value of "Total FT Bank 1" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT B1S1" and "Long FT B1S1".
An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1 and A/F Learn Value High Bank 1. (For Toyota Prius vehicles equipped with a V type engine, check that both banks have the same correction tendency. If the correction of either bank is -20% or less or 20% or more, the air fuel ratio sensor or heated oxygen sensor of that bank may be malfunctioning.)
The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is 20% or more):
1. Decrease in fuel injector assembly injection volume
2. Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)
3. Air leaks in intake system after mass air flow meter sub-assembly
4. Decrease in fuel pressure (at fuel filter, fuel pump or fuel pressure regulator assembly)
On Toyota Prius vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value High Bank 1" only is corrected to the positive side, a malfunction in the fuel system (clogging of the fuel pump or fuel filter) is suspected.
On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value Idle Bank 1" or "A/F Learn Value Low Bank 1" only is corrected to the positive side, an air leak after the mass air flow meter sub-assembly is suspected.
The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -20% or less):
1. Increase in the fuel injector assembly injection volume
2. Purge VSV system

GO TO STEP 15

6.	PERFORM ACTIVE TEST USING GTS (CONTROL THE SELECT CYLINDER FUEL CUT)

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine.

HINT:

Reproduce the Toyota Prius vehicle conditions when the malfunction occurred (such as after the engine is warmed up or after a cold start).

(c) Enter the following menus: Powertrain / Engine / Active Test / Control the Select Cylinder Fuel Cut / Data List / Engine Speed.

Powertrain > Engine > Active Test

Active Test Display
Control the Select Cylinder Fuel Cut

Data List Display
Engine Speed

(d) According to the display on the GTS, perform the Active Test and check for a malfunctioning cylinder.

HINT:

Perform fuel-cut for each cylinder and check the change in the engine speed.
If the engine speed of a cylinder does not change while performing the Active Test, it can be determined that the cylinder is malfunctioning.
If the engine speed of all cylinders change while performing the Active Test, it can be determined that multiple cylinders are malfunctioning.
A cylinder for which the Data List items "Misfire Count Cylinder #1 to #4" increases may be malfunctioning.

Result	Proceed to
One cylinder is malfunctioning	A
Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined.	B

GO TO STEP 13

7.	PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)

HINT:

If the Toyota Prius vehicle does not support the Active Test Check the Cylinder Compression, measure the compression pressure. If the compression pressure is normal, go to step 8.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(d) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

HINT:

Do not start the engine.

(e) Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder.

Powertrain > Engine > Active Test

Active Test Display
Check the Cylinder Compression

Data List Display
Engine Speed Cylinder #1
Engine Speed Cylinder #2
Engine Speed Cylinder #3
Engine Speed Cylinder #4
Average Engine Speed of All Cylinder

HINT:

To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.

(f) Push the snapshot button to turn the snapshot function on.

HINT:

Using the snapshot function, data can be recorded during the Active Test.

(g) While the engine is not running, press the Active button to change Check the Cylinder Compression to "Start".

(h) Start the engine.

(i) Monitor the engine speed (Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder) displayed on the GTS.

NOTICE:

If the Check the Cylinder Compression Active Test needs to be performed after it is changed to "Start" and performed once, press the Exit button to return to the Active Test menu screen. Then perform the Check the Cylinder Compression Active Test again.

HINT:

At first, the GTS display will show each cylinder's engine speed measurement to be extremely high. After the engine has started, each cylinder's engine speed measurement will change to the actual engine speed.
As soon as the measurements are obtained, stop the Active Test.
If the cylinder engine speed values (Engine Speed Cylinder #1 to #4) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.

(j) Stop the engine and change the Active Test "Check the Cylinder Compression" to "Stop" after the engine stops.

NOTICE:

After performing the Active Test, make sure to check and clear the DTCs.

(k) Push the snapshot button to turn the snapshot function off.

(l) Read the value.

HINT:

If the value of Data List item "Engine Speed Cylinder" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.
If the value of Data List item "Engine Speed Cylinder" is high for only one cylinder, compression loss is suspected.

Result

Proceed to

There is no variation in "Engine Speed Cylinder"

(All cylinders display approximately the same value for "Engine Speed of Cyl")

There is variation in "Engine Speed Cylinder"

(Only one cylinder displays a value for "Engine Speed of Cyl" that differs considerably)

GO TO STEP 12

8.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME)

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all accessories off.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.

Powertrain > Engine > Active Test

Tester Display
Control the Injection Volume

(e) According to the display on the GTS, perform the Active Test and check the Toyota Prius vehicle conditions when increasing and decreasing the fuel injection volume.

HINT:

Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 24.8%).

Result	Proceed to
Malfunction is still present even if the fuel injection volume is changed	A
Malfunction disappears when the fuel injection volume is changed	B

GO TO STEP 11

9.	CHECK IGNITION SYSTEM

(a) Check the ignition system.

Click here

HINT:

Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and check if the malfunctioning cylinder returns to normal.
If the spark plug of the malfunctioning cylinder is abnormally wet with fuel even after the ignition coil assembly and spark plug are replaced, a leaking fuel injector assembly is suspected.

Result	Proceed to
The malfunctioning cylinder does not return to normal	A
The malfunctioning cylinder returned to normal	B

GO TO STEP 23

10.	INSPECT OTHER RELATED COMPONENTS

(a) Check the power source circuit, wire harness and connectors.

GO TO STEP 23

11.	REPLACE FUEL INJECTOR ASSEMBLY

(a) Replace the fuel injector assembly of the malfunctioning cylinder.

Click here

HINT:

If the air fuel ratio learned value is corrected to the positive side for all operating ranges due to low fuel injector assembly injection volume, replace the fuel injector assemblies of all cylinders.
If the symptoms tend to improve by decreasing the fuel injection amount, the engine misfire may be due to blockage of an EGR port leading to EGR becoming excessive to the cylinders with little EGR port blockage.

GO TO STEP 24

12.	CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary.

Click here

GO TO STEP 23

13.	PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

(c) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
Engine Independent

(d) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTICE:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

Result	Proceed to
Intake Manifold Absolute Pressure increases by less than 10 kPa (1.45 psi) when the EGR valve is fully closed (0 step)	A
Intake Manifold Absolute Pressure increases by 10 kPa (1.45 psi) or higher when the EGR valve is fully closed (0 step)	B

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

GO TO STEP 15

14.	REPLACE EGR VALVE ASSEMBLY

(a) Replace the EGR valve assembly.

Click here

GO TO STEP 24

15.	READ VALUE USING GTS (MASS AIR FLOW SENSOR)

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all accessories off.

(c) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Mass Air Flow Sensor
Coolant Temperature

(d) According to the display on the GTS, read the Data List when the ignition switch is turned ON and while maintaining an engine speed of 2500 rpm.

HINT:

Result

Proceed to

Other than below

Ignition switch ON (engine stopped): 0.58 gm/sec or higher

Engine speed 2500 rpm (without load): Less than 4.0 gm/sec

GO TO STEP 22

16.	PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all accessories off.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Current B1S1 and O2 Sensor Voltage B1S2.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
A/F (O2) Sensor Current B1S1
O2 Sensor Voltage B1S2

(e) According to the display on the GTS, perform the Active Test and check the Toyota Prius vehicle conditions when increasing and decreasing the fuel injection volume.

NOTICE:

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
Read the output voltage immediately after warming up the air fuel ratio sensor and heated oxygen sensor to avoid an inaccurate reading due to a sensor cooling.

HINT:

The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.

Standard:

GTS Display (Sensor)	Injection Volume	Voltage
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	12.5%	Below -0.075 mA
A/F (O2) Sensor Current B1S1 (Air fuel ratio)	-12.5%	Higher than 0.037 mA
O2 Sensor Voltage B1S2 (Heated oxygen)	12.5%	Higher than 0.55 V
O2 Sensor Voltage B1S2 (Heated oxygen)	-12.5%	Below 0.4 V

Result	Proceed to
Output voltage values are abnormal	A
Malfunction disappears when fuel injection volume is increased	B
Malfunction is still present when fuel injection volume is increased, even if output voltage values are normal	C

GO TO STEP 20

GO TO STEP 21

17.	REPLACE AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR

(a) Replace the air fuel ratio sensor.

Click here

(b) Replace the heated oxygen sensor.

Click here

GO TO STEP 24

18.	REMOVE FOREIGN MATTER (CLEAN THROTTLE BODY ASSEMBLY)

(a) Clean off any deposits inside of the throttle body assembly.

(b) Push open the throttle valve and wipe off any deposits from the valve and bore using a piece of cloth soaked in non-residue solvent.

*1	Throttle Body Assembly	*2	Bore
*3	Throttle Valve	-	-
*a	Reference	*b	Throttle Body Assembly Cross-section Diagram
*c	When valve fully opened	*d	Do not directly apply cleaner
*e	Deposits	-	-

NOTICE:

Make sure that the cloth or your fingers do not get caught in the valve.
Make sure that foreign matter does not enter the throttle valve.
Do not directly apply non-residue solvent to the throttle body assembly or wash the throttle body assembly. Non-residue solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.
If there is coating material on the edge of the throttle valve, be careful not to remove it.

HINT:

The illustration is for reference only, actual parts may differ.

19.	PERFORM CONFIRMATION DRIVING PATTERN

(a) Perform "Inspection After Repair" after cleaning the throttle body assembly.

Click here

(b) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

(d) Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.

HINT:

If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body assembly, the idle speed may increase.

GO TO STEP 24

20.	REPLACE FUEL INJECTOR ASSEMBLY

(a) Replace the fuel injector assemblies of all cylinders.

Click here

GO TO STEP 24

21.	INSPECT OTHER RELATED COMPONENTS

(a) Inspect other related components.

HINT:

If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.

Engine mount deterioration
Deposits in the intake manifold or on an intake valve
EGR distribution is poor due to EGR port blockage
Delay in fuel supply due to adherence of the fuel to the deposits

GO TO STEP 23

22.	CHECK INTAKE SYSTEM

(a) Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.

HINT:

If there is foreign matter in the intake system components, remove it before proceeding to the next step.
If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.

23.	REPAIR OR REPLACE MALFUNCTIONING PART

(a) Repair or replace the malfunctioning part.

(b) Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.

Click here

24.	CONDUCT CONFIRMATION TEST

(a) Check that the idle has returned to normal.

END

Relay Throttle Body

Toyota Prius (XW60) 2023-2025 Service Manual

Sfi System

Precaution
Definition Of Terms
Parts Location
System Diagram
How To Proceed With Troubleshooting
Check For Intermittent Problems
Basic Inspection
Registration
Initialization
Terminals Of Ecm
Diagnosis System
Dtc Check / Clear
Freeze Frame Data
Check Mode Procedure
Fail-safe Chart
Data List / Active Test
Vehicle Control History
A Camshaft Position Actuator Bank 1 Circuit Open (P001013)
Camshaft Position "A" - Timing Over-Advanced or System Performance Bank 1 (P001100,P001200)
Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A (P001600)
HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P101A9E)
HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery (P003612,P003614,P102A9E)
Manifold Absolute Pressure - Barometric Pressure Correlation (P006900)
Mass or Volume Air Flow Sensor "A" Circuit Short to Battery (P010012,P010014)
Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Ground (P010511)
Manifold Absolute Pressure / Barometric Pressure Sensor Circuit Short to Battery or Open (P010515)
Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Ground (P011011)
Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open (P011015)
Engine Coolant Temperature Sensor 1 Circuit Short to Ground (P011511)
Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open (P011515)
Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)
Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground (P012011)
Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open (P012015)
Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range (P01201C)
O2 Sensor Circuit Bank 1 Sensor 2 Circuit Open (P013613,P013617,P01361C)
System Too Lean Bank 1 (P017100,P017200)
Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground (P022011)
Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open (P022015)
Random/Multiple Cylinder Misfire Detected (P030000,P030027,P030085-P030400)
Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground (P032511)
Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Battery or Open (P032515)
Crankshaft Position Sensor "A" Circuit Short to Ground (P033511)
Crankshaft Position Sensor "A" Circuit Short to Battery or Open (P033515)
Crankshaft Position Sensor "A" Signal Stuck in Range (P03352A)
Crankshaft Position Sensor "A" No Signal (P033531)
Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground (P034011)
Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Battery or Open (P034015)
Camshaft Position Sensor "A" Bank 1 or Single Sensor Signal Stuck in Range (P03402A)
Camshaft Position Sensor "A" Bank 1 or Single Sensor No Signal (P034031)
Exhaust Gas Recirculation "A" Low / Insufficient Flow (P04019C)
Exhaust Gas Recirculation "A" Control Circuit 1 Open (P040314,P140000,P140596,P141004)
Catalyst System Efficiency Below Threshold Bank 1 (P042000)
Evaporative Emission System Purge Control Valve "A" Circuit Open (P044313)
System Voltage Circuit Short to Ground or Open (P056014)
Internal Control Module Random Access Memory (RAM) Error Data Memory Failure (P060444)
Control Module Processor Watchdog/Safety MCU Failure (P060647)
Control Module Performance Bank 1 Watchdog/Safety MCU Failure (P060747,P060787)
Internal Control Module Throttle Position Performance Internal Electronic Failure (P060E49)
VIN Not Programmed (P063051)
Actuator Supply Voltage "A" Circuit Short to Ground or Open (P065714)
Throttle Actuator "A" Control Motor Circuit Current Below Threshold (P210018,P210019)
Throttle/Pedal Position Sensor "A" Minimum Stop Performance (P210900)
Throttle Actuator "A" Control System Actuator Stuck Open (P211172,P211173)
Throttle Actuator "A" Control Throttle Body Range/Performance (P211900,P211904,P211977,P21199B)
Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)
A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1 Circuit Current Above Threshold (P219519,P219524,P219618,P219623)
Barometric Pressure Sensor "A" Circuit Short to Ground (P222611,P222615)
Barometric Pressure Sensor "A" Missing Message (P222687,P222696)
A/F (O2) Sensor Positive Current Control Circuit / Open Bank 1 Sensor 1 (P223700,P223711,P223712,P223713,P22371B,P225111,P225112)
Ignition Switch On/Start Position Circuit Low Circuit Short to Ground or Open (P253314)
ECM/PCM Engine Off Timer Performance Signal Invalid (P261029)
Engine Coolant Pump Circuit Short to Battery (P26CA12)
Engine Coolant Pump No Signal (P26CA31)
Engine Coolant Pump Actuator Stuck (P26CB71)
Engine Coolant Pump Overspeed (P26CE37)
O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold (P2A0026)
Poor Engine Power (P319000,P319100)
Fuel Run Out (P319300)
Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)
Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message (U011187)
Lost Communication With Hybrid Powertrain Control Module Missing Message (U029387)
Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message (U115087)
ECM Power Source Circuit
VC Output Circuit
Fuel Pump Control Circuit
Fuel Injector Circuit
MIL Circuit
Ignition Circuit
Rough Idling

Actual pages

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Engine speed	Duration
Idling	4.5 minutes or more
1000	4.5 minutes or more
2000	2.5 minutes or more
3000	1.5 minutes or more