Engine Control Module: Service and Repair

ENGINE CONTROL MODULE (ECM) REPLACEMENT

REMOVAL PROCEDURE




- Turn the ignition OFF.

NOTE: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

- Remove the front compartment sight shields as necessary.
- Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.

IMPORTANT:
- It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change.
- It is necessary to record the remaining automatic transmission fluid life. If the replacement module is not programed with the remaining automatic transmission fluid life, the automatic transmission fluid life will default to 100 percent. If the replacement module is not programmed with the remaining automatic transmission fluid life, the automatic transmission fluid will need to be changed at 83 000 km (50,000 mi) from the last automatic transmission fluid change.

- Use a DMM in order to measure the main relay circuit voltage at the ECM fuse in the underhood fuse block.
- Disconnect the battery negative cable.
- Remove the ECM fuse in the underhood fuse block.
- Remove the TCM/IPC fuse in the underhood fuse block.
- Remove the ECM/TCM fuse in the underhood fuse block.
- Unlock the chassis side (upper) engine control module (ECM) electrical connector.
- Depress the ECM electrical connector lever lock (1).
- Simultaneously rotate the ECM connector clamp lever and depress the lock slide (2).

IMPORTANT: Ensure that there is no main relay circuit voltage (ECM Fuse).




- Remove the body side (upper) ECM connector.

NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.




- Unlock and remove the engine side (lower) ECM connector.




- Remove the ECM redundant ground wire and bolt (2) from the ECM.




- Remove the ECM bolts.
- Remove the ECM.
- If you are replacing the ECM bracket, perform the following steps:




- Remove the electrical connector bracket and bolt from the ECM bracket.




- Remove the ground wire and bolt from the ECM bracket.




- Remove the wire harness retainer and bolt from the side of the ECM bracket.




- Remove the ECM bracket bolts (2 and 3).
- Remove the ECM bracket (1).

INSTALLATION PROCEDURE




- Install the ECM bracket (1).
- Install the ECM bracket bolts (2 and 3).

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten the ECM bracket bolt (2) to 10 N.m (89 lb in).
Tighten the ECM bracket bolts (3) to 23 N.m (17 lb ft).




- Install the wire harness retainer and bolt to the side of the ECM bracket.

Tighten the wire harness retainer bolt to 23 N.m (17 lb ft).




- Install the electrical connector bracket and bolt to the ECM bracket.

Tighten the electrical connector bracket bolt to 10 N.m (89 lb in).




- Install the wiring harness ground wire and bolt (2) to the ECM bracket.

Tighten the wiring harness ground wire bolt 10 N.m (89 lb in).




- Install the ECM.

NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

- Install the ECM bolts.

Tighten the ECM bolts to 10 N.m (89 lb in).




- Install the ECM redundant ground and bolt (2) to the ECM.

Tighten the ECM redundant ground wire bolt to 5 N.m (44 lb in).




- Install the engine side (lower) ECM connector.




- Install the body side (upper) ECM connector.
- Install the ECM/TCM fuse in the underhood fuse block.
- Install the TCM/IPC fuse in the underhood fuse block.
- Install the ECM fuse in the underhood fuse block.
- Connect the battery negative cable to the battery.
- Program the ECM. Programming and Relearning
- Turn OFF the ignition for at least 5 seconds after the programming event is complete.
- Install the front compartment sight shields as necessary.