Engine Control Module: Service and Repair

ENGINE CONTROL MODULE (ECM)

REMOVAL PROCEDURE

NOTE:
- In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins or the soldered components on the circuit board.
- Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil 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%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.

2. Disconnect the negative battery cable.




3. Disconnect the small ECM harness connector (3) from the ECM.
4. Remove the bolt retaining the large ECM connector to the ECM.
5. Disconnect the large ECM harness connector (4) from the ECM.




6. Use the retaining tab to release the ECM from the underhood junction block bracket.

INSTALLATION PROCEDURE




1. Use the retaining tab to secure the ECM, when installing the ECM to the underhood junction block bracket.




2. Connect the large ECM harness connector (4) to the ECM.

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten the bolt to 4 N.m (35 lb in).

3. Connect the small ECM harness connector (3) to the ECM.
4. Connect the negative Battery Cable.
5. Program the ECM. Programming and Relearning