Toyota Prius: Throttle Body

• On-vehicle Inspection
• Removal
• Inspection
• Installation

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT THROTTLE BODY ASSEMBLY

(a) Before cleaning, or after cleaning the throttle body with motor assembly and installing it to the vehicle, turn the ignition switch to ON without operating the accelerator pedal sensor assembly.

NOTICE:

If the accelerator pedal sensor assembly has been operated, restart the procedure from the step above.

(b) Connect the GTS to the DLC3 and check for DTCs. If DTCs are stored, repair them by following the repair procedure flow. If DTCs are not stored, perform the throttle body operation check.

(c) Check throttle body operation.

(1) Enter the following menus:

Powertrain / Engine / Active Test / Control the ETCS Open/Close Slow Speed

(2) During Active Test operation, check the Data List items "Throttle Position Command" and "Throttle Position Sensor No.1 Voltage".

Powertrain > Engine > Active Test

Active Test Display
Control the ETCS Open/Close Slow Speed

Data List Display
Throttle Position Sensor No.1 Voltage
Throttle Position Command

*a	Correct	*b	Incorrect
*c	Throttle Position Command	*d	Throttle Position Sensor No.1 Voltage
*e	Specified Condition	*f	200 ms

OK:

Tester Display	Condition	Specified Condition
Throttle Position Command Throttle Position Sensor No.1 Voltage	Checked during Active Test operation at a voltage of 1.3 V to 2.1 V.	Response lag between Throttle Position Command and Throttle Position Sensor No.1 Voltage is within 200 ms.

(3) Enter the following menus:

Powertrain / Engine / Active Test / Control the ETCS Open/Close Fast Speed

(4) During Active Test operation, check the Data List items "Throttle Position Command" and "Throttle Position Sensor No.1 Voltage".

Powertrain > Engine > Active Test

Active Test Display
Control the ETCS Open/Close Fast Speed

Data List Display
Throttle Position Sensor No.1 Voltage
Throttle Position Command

*a	Correct	*b	Incorrect
*c	Throttle Position Command	*d	Throttle Position Sensor No.1 Voltage
*e	Specified Condition	*f	200 ms

OK:

Tester Display	Condition	Specified Condition
Throttle Position Command Throttle Position Sensor No.1 Voltage	Checked during Active Test operation at a voltage of 1.3 V to 2.1 V.	Response lag between Throttle Position Command and Throttle Position Sensor No.1 Voltage is within 200 ms.

(d) If there was any abnormality found during the throttle body operation check, clean the throttle body, then reassemble it and perform the throttle body operation check again. If the operation returns to normal, the procedure is complete. If operation does not return to normal, replace the throttle body assembly.

(e) Perform "Inspection After Repair" after replacing or cleaning the throttle body assembly.

HINT:

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Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during throttle body assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Replacement of throttle body assembly Cleaning the deposits from the throttle body assembly	Inspection after repair	Poor idle, etc. Engine start function, etc.

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	DRAIN ENGINE COOLANT (for Engine)	-	-		-
2	AIR CLEANER CAP SUB-ASSEMBLY	17705	-	-	-
3	AIR CLEANER HOSE ASSEMBLY	-	-	-	-
4	WATER BY-PASS HOSE	16261	-	-	-
5	NO. 2 WATER BY-PASS HOSE	16264	-	-	-
6	THROTTLE BODY ASSEMBLY	22210		-	-
7	THROTTLE BODY GASKET	22271	-	-	-

*A	w/ Stud Bolt	*B	w/o Stud Bolt
●	Non-reusable part	-	-

PROCEDURE

1. DRAIN ENGINE COOLANT (for Engine)

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2. REMOVE AIR CLEANER CAP SUB-ASSEMBLY

3. REMOVE AIR CLEANER HOSE ASSEMBLY

4. DISCONNECT WATER BY-PASS HOSE

5. DISCONNECT NO. 2 WATER BY-PASS HOSE

6. REMOVE THROTTLE BODY ASSEMBLY

NOTICE: If the throttle body assembly has been struck or dropped, replace it.

*A

w/ Stud Bolt

*B

w/o Stud Bolt

7. REMOVE THROTTLE BODY GASKET

Inspection

INSPECTION

PROCEDURE

1. INSPECT THROTTLE BODY ASSEMBLY

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition Result 1 (M-) - 2 (M ) 20°C (68°F) 0.3 to 100 Ω Ω If the result is not as specified, replace the throttle body assembly.

*a Component without harness connected (Throttle Body Assembly)

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	THROTTLE BODY GASKET	22271		-	-
2	THROTTLE BODY ASSEMBLY	22210		-	-
3	NO. 2 WATER BY-PASS HOSE	16264	-	-	-
4	WATER BY-PASS HOSE	16261	-	-	-
5	AIR CLEANER HOSE ASSEMBLY	-		-	-
6	AIR CLEANER CAP SUB-ASSEMBLY	17705		-	-
7	ADD ENGINE COOLANT (for Engine)	-	-		-
8	INSPECT FOR COOLANT LEAK (for Engine)	-	-	-
9	PERFORM INITIALIZATION	-	-	-

*A	w/ Stud Bolt	*B	w/o Stud Bolt
	N*m (kgf*cm, ft.*lbf): Specified torque	●	Non-reusable part

PROCEDURE

1. INSTALL THROTTLE BODY GASKET

*a

Protrusion

*b

Gutter

(1) Install a new throttle body gasket to the intake manifold with the protrusion of the throttle body gasket oriented as shown in the illustration.

2. INSTALL THROTTLE BODY ASSEMBLY

NOTICE: If the throttle body assembly has been struck or dropped, replace it.

Torque:

10 N·m {102 kgf·cm, 7 ft·lbf}

3. CONNECT NO. 2 WATER BY-PASS HOSE

4. CONNECT WATER BY-PASS HOSE

5. INSTALL AIR CLEANER HOSE ASSEMBLY

*a	Cutout	*b	Protrusion
*c	Stopper	*d	Top
*e	Right of Toyota Prius Vehicle	*f	45°
*g	Left of Vehicle	-	-

(1) Install the air cleaner hose assembly to the throttle body assembly.

NOTICE:

Align the cutout of the air cleaner hose assembly with the protrusion of the throttle body assembly.

(2) Tighten the hose clamp in the position shown in the illustration.

Torque:

2.0 N·m {20 kgf·cm, 18 in·lbf}

(3) Connect the No. 2 ventilation hose to the cylinder head cover sub-assembly and slide the clip to secure it.

NOTICE:

Make sure that the clip is in the correct position.

6. INSTALL AIR CLEANER CAP SUB-ASSEMBLY

*a	Cutout	*b	Protrusion
*c	Stopper	*d	Top
*e	Front of Toyota Prius Vehicle	-	-

(1) Install the air cleaner cap sub-assembly to the air cleaner hose assembly.

NOTICE:

Align the cutout of the air cleaner hose assembly with the protrusion of the air cleaner cap sub-assembly.

(2) Tighten the hose clamp in the position shown in the illustration.

Torque:

2.0 N·m {20 kgf·cm, 18 in·lbf}

HINT:

Make sure that the hose clamp is positioned as shown in the illustration.

(3) Engage the 2 guides and install the air cleaner cap sub-assembly to the air cleaner case sub-assembly.

(4) Engage the 2 clamps.

(5) Connect the wire harness clamp.

(6) Connect the mass air flow meter connector.

7. ADD ENGINE COOLANT (for Engine)

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8. INSPECT FOR COOLANT LEAK (for Engine)

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9. PERFORM INITIALIZATION

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