Toyota Prius: Ecm

• Removal
• Installation

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 ECM 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 ECM	Perform Toyota Prius Vehicle Identification Number (VIN) registration	DTC is output
	ECU configuration	-
	Update ECU security key	Toyota Prius Vehicle Control History (RoB) are stored

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

Items for which learning is completed by driving the Toyota Prius vehicle

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Front Camera System	Drive the Toyota Prius vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.

Items for which learning is completed by operating the vehicle normally

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
*1: w/o Power Back Door System *2: w/ Power Back Door System
Power Door Lock Control System*1 Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.
Power Back Door System*2	Reset back door close position
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	PRECAUTION	-		-	-
2	AUXILIARY BATTERY	-	-	-	-
3	ECM	89661		-	-
4	NO. 1 ECM BRACKET	89667E	-	-	-
5	NO. 2 ECM BRACKET	89668	-	-	-

PROCEDURE

1. PRECAUTION

NOTICE: After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Click here Do not replace the battery ECU assembly and ECM at the same time as the HV battery learning values will be lost. However, if it is necessary to replace both ECUs at the same time, replace them by following the procedure below. Do not replace the battery ECU assembly or ECM with a used one from another Toyota Prius vehicle.

HV battery learning values are stored in the battery ECU assembly and ECM and are used to detect malfunctions and illuminate the hybrid battery indicator light in the combination meter assembly. When either of these ECUs is replaced, the new ECU receives the HV battery learning values from the other ECU and stores them.

(a) Procedure when replacing both battery ECU assembly and ECM:

(1) Disconnect the cable from the negative (-) auxiliary battery terminal.

(2) Replace either ECU.

(3) Connect the cable to the negative (-) auxiliary battery terminal.

(4) Turn the ignition switch to ON (READY) and wait for 5 minutes or more.

(5) Turn the ignition switch off and disconnect the cable from the negative (-) auxiliary battery terminal.

(6) Replace the other ECU.

(7) Connect the cable to the negative (-) auxiliary battery terminal.

(8) Check that the ignition switch can be turned to ON (READY).

HINT:

If the battery ECU assembly and ECM are replaced at the same time without following the above procedure, replace either the battery ECU assembly and ECM with its original one and then replace it again by following the above procedure. If the correct procedure is not followed, perform the procedure again from the beginning.

2. REMOVE AUXILIARY BATTERY

Click here

3. REMOVE ECM

(1) Raise the 2 levers while pushing the locks on the levers, and disconnect the 2 ECM connectors.

NOTICE:

After disconnecting the ECM connectors, make sure that dirt, water or other foreign matter does not contact the connecting parts of the ECM connectors.

(2) Disengage the 2 clamps.

(3) Remove the 2 nuts and ECM from the engine mounting insulator LH.

NOTICE:

If the ECM has been struck or dropped, replace it.

4. REMOVE NO. 1 ECM BRACKET

5. REMOVE NO. 2 ECM BRACKET

Installation

INSTALLATION

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	NO. 2 ECM BRACKET	89668	-	-	-
2	NO. 1 ECM BRACKET	89667E	-	-	-
3	ECM	89661		-	-
4	AUXILIARY BATTERY	-	-	-	-
5	Toyota Prius Vehicle IDENTIFICATION NUMBER (VIN) REGISTRATION	-	-	-
6	ECU CONFIGURATION	-	-	-
7	UPDATE ECU SECURITY KEY	-	-	-
8	INITIALIZATION AFTER RECONNECTING AUXILIARY BATTERY TERMINAL	-	-	-

N*m (kgf*cm, ft.*lbf): Specified torque

-

-

PROCEDURE

1. INSTALL NO. 2 ECM BRACKET

Torque:

4.5 N·m {46 kgf·cm, 40 in·lbf}

2. INSTALL NO. 1 ECM BRACKET

Torque:

4.5 N·m {46 kgf·cm, 40 in·lbf}

3. INSTALL ECM

(1) Install the ECM to the engine mounting insulator LH with the 2 nuts.

Torque:

8.0 N·m {82 kgf·cm, 71 in·lbf}

NOTICE:

If the ECM has been struck or dropped, replace it.

(2) Engage the 2 clamps.

(3) Connect the 2 ECM connectors and lower the 2 levers.

4. INSTALL AUXILIARY BATTERY

Click here

5. Toyota Prius Vehicle IDENTIFICATION NUMBER (VIN) REGISTRATION

Click here

6. ECU CONFIGURATION

Click here

7. UPDATE ECU SECURITY KEY

Click here

8. INITIALIZATION AFTER RECONNECTING AUXILIARY BATTERY TERMINAL

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