Engine Control Module: Service and Repair

ENGINE CONTROL MODULE (ECM) REPLACEMENT

Engine control module (ECM) service should normally consist of either ECM replacement or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures require ECM replacement, check the ECM first to see if the correct part is being used.

IMPORTANT:
- In order to prevent internal ECM damage, the ignition must be OFF when you disconnect or reconnect the power to the ECM. For example, disconnect the power when you work with the following components:
- A battery cable
- The ECM pigtail
- The ECM fuse
- The jumper cables
- When you diagnose or replace the ECM, remove any debris from the ECM connector surfaces before servicing the ECM module connector gaskets. Ensure that the gaskets are installed correctly. The gaskets prevent intrusion into the ECM.
- The replacement ECM MUST be programmed.

Removal Procedure
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 percent. 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. Remove the wheelhouse filler panel.




3. Disconnect the ECM electrical harness connectors.




4. Remove the ECM from the bracket and the vehicle.

Installation Procedure




1. Install the ECM to the ECM bracket.




2. Connect the electrical connectors to the ECM.

NOTE: Refer to Fastener Notice.

Tighten the ECM electrical connectors to 8 N.m (70 lb in).

3. Install the wheelhouse filler panel.
4. If a new ECM is being installed, program the ECM. Refer to Control Module References. Programming and Relearning