Toyota Avalon Service & Repair Manual: 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

Battery terminal is disconnected/reconnected

Perform steering sensor zero point calibration

Lane Departure Alert System (w/ Steering Control)

Pre-collision System

Intelligent Clearance Sonar System*1

Lighting System (for Gasoline Model with Cornering Light)

Memorize steering angle neutral point

Parking Assist Monitor System

Panoramic View Monitor System

Replacement of ECM

Vehicle Identification Number (VIN) registration

MIL comes on

ECU communication ID registration (Immobiliser system)

Engine start function

Replacement of ECM

(If transaxle compensation code read from ECM)

  • Perform reset memory*2
  • Transfer transaxle compensation code
  • Perform road test to allow ECM to learn
  • Large shift shock
  • Deterioration of fuel efficiency

for Initialization

for Registration

Replacement of ECM

(If transaxle compensation code not read from ECM)

  • Perform reset memory*2
  • Reset transaxle compensation code
  • Perform road test to allow ECM to learn

Replacement of ECM

Code registration (Smart Key System (for Start Function))

  • Wireless Door Lock Control System
  • Smart Key System (for Entry Function)
  • Smart Key System (for Start Function)
  • Steering lock function

  • *1: When performing learning using the Techstream.

    Click here

  • *2: Not necessary when ECM replaced with new one

NOTICE:

  • 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.

    Click here

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

    Click here

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

Click here

2. REMOVE COOL AIR INTAKE DUCT SEAL

Click here

3. REMOVE INLET AIR CLEANER ASSEMBLY

Click here

4. REMOVE AIR CLEANER ASSEMBLY WITH AIR CLEANER HOSE

Click here

5. REMOVE ECM

(a) Rotate the 2 levers while pushing the locks, and disconnect the 2 ECM connectors.

NOTICE:

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

(b) Remove the 2 bolts, nut and ECM.

NOTICE:

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

6. REMOVE NO. 1 ECM BRACKET

(a) Remove the 2 screws and No. 1 ECM bracket from the ECM.

7. REMOVE NO. 2 ECM BRACKET

(a) Remove the 2 screws and No. 2 ECM bracket from the ECM.

    Installation

    Engine Coolant Temperature Sensor

    See More:

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