ECM 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
Battery terminal is disconnected/reconnected	Drive the vehicle until stop and start control is permitted (approximately 5 to 60 minutes)	Stop and Start System	Click here
	Memorize steering angle neutral point	Panoramic View Monitor System	Click here
	Initialize back door lock	Power Door Lock Control System	Click here
	Initialize servo motor	Air Conditioning System	Click here
	Reset slide door close position	Power Slide Door System	Click here
	Reset back door close position	Power Back Door System	Click here
Replacement of ECM	Perform Vehicle Identification Number (VIN) or frame number registration	DTC is stored	Click here
Replacement of ECM	ECU communication ID registration (Immobiliser System)	Engine start function	See Service Bulletin for the registration method.
Replacement of battery	Switch battery type	Stop and Start System	Click here
Replacement of ECM (If possible, read the transaxle compensation code from the previous ECM)	Reset memory*1 Transfer transaxle compensation code Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	Click here for Initialization Click here for Registration
Replacement of ECM (If impossible, read the transaxle compensation code from the previous ECM)	Reset memory*1 Reset transaxle compensation code Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	Click here for Initialization Click here for Registration
Replacement of ECM	Perform code registration (Immobiliser system)	Wireless Door Lock Control System Smart Entry and Start System Engine start function Steering Lock System	See Service Bulletin for the registration method.

*1: When the ECM is replaced with a new one, reset memory is unnecessary.

Note

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

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If the ECM has been struck or dropped, replace it.
Perform Vehicle Identification Number (VIN) registration when replacing the ECM.

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PROCEDURE

REMOVE V-BANK COVER SUB-ASSEMBLY

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REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE

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REMOVE RADIATOR COVER SUB-ASSEMBLY (for ALPHARD)

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REMOVE RADIATOR COVER SUB-ASSEMBLY (for VELLFIRE)

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SEPARATE CENTER NO. 1 COWL TOP VENTILATOR LOUVER

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DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

Note

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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REMOVE BATTERY

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REMOVE AIR CLEANER CASE SUB-ASSEMBLY
1. Remove the 3 bolts and air cleaner case sub-assembly.
REMOVE INLET NO. 1 AIR CLEANER
1. Remove the bolt and inlet No. 1 air cleaner.
REMOVE INLET NO. 2 AIR CLEANER
1. Remove the bolt and inlet No. 2 air cleaner.
REMOVE ECM
1. Rotate the 2 levers while pushing the locks, and disconnect the 2 ECM connectors.
  
  Note
  
  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 wire harness clamp.
3. Remove the 3 bolts and ECM.
  
  Note
  
  If the ECM has been struck or dropped, replace it.
REMOVE NO. 1 ECM BRACKET
1. Remove the 2 screws and No. 1 ECM bracket from the ECM.
REMOVE NO. 2 ECM BRACKET
1. Remove the 2 screws and No. 2 ECM bracket from the ECM.