Engine Control Module: Service and Repair

Engine Control Module 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.

Note: 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

Note:
* 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

Note: Record the current engine oil life percentage and use a scan tool to update the NEW ECM, if replacing.




1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
2. Remove the wheelhouse filler panel. Refer to Front Wheelhouse Liner Replacement (Front Liner) (Front Wheelhouse Liner Replacement (Front Liner))Front Wheelhouse Liner Replacement (Rear Liner) (Front Wheelhouse Liner Replacement (Rear Liner)).
3. Remove the ECM bolts (1).




4. Remove the ECM from the bracket and allow the ECM to hang down from the engine wiring harness.
5. Disconnect the engine wiring harness electrical connectors (1) from the ECM.
6. Remove the ECM.

Installation Procedure




1. Position the ECM.
2. Connect the engine wiring harness electrical connectors (1) to the ECM and position the ECM into the bracket.





Caution: Refer to Fastener Caution (Fastener Caution).

3. Install the ECM bolts (1) and tighten to 10 Nm (89 lb in).
4. Install the wheelhouse filler panel. Refer to Front Wheelhouse Liner Replacement (Front Liner) (Front Wheelhouse Liner Replacement (Front Liner))Front Wheelhouse Liner Replacement (Rear Liner) (Front Wheelhouse Liner Replacement (Rear Liner)).
5. If a new ECM is being installed, program the ECM. Refer to Control Module References (Programming and Relearning).