Engine Control Module: Service and Repair

Engine Control Module Replacement

Removal Procedure


Important:
* When returning a replaced control unit, do not clear the fault memory.

* The security code must be reset using Tech 2 when replacing or interchanging the engine control module (before removal).



1. Open the hood.
2. Read out control unit data with a Tech 2. Refer to Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) .
Caution: Refer to Battery Disconnect Caution (Battery Disconnect Caution) .

Important: The battery must not be disconnected until all consumers (e.g. fan) have ceased operation. However, a minimum waiting time of 30 seconds must be observed.


3. Disconnect the battery.

* Remove the ground connection from the ground terminal.
* Loosen the nut.





4. Remove the wiring harness from the engine control module (ECM).
Disconnect the 2 wiring harness plugs (1).
5. Remove the ground cable (2) from the ECM.
Remove the bolt.
6. Remove the ECM.
Remove the 4 bolts (3).



Installation Procedure


Notice: Refer to Fastener Notice (Fastener Notice) .

1. Install the ECM.

Tighten the 4 bolts to 8 N.m (71 lb in).

2. Install the ground cable to the ECM.

Tighten the bolt to 8 N.m (71 lb in).

3. Install the wiring harness to the ECM.
Connect the 2 wiring harness plugs.
4. Connect the battery.
Install the ground connection to the ground terminal.

Tighten the nut to 5 N.m (44 lb in).

5. Upload the control unit data with Tech 2. Refer to Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) .
6. For programming procedures, refer to Control Module References (Programming and Relearning) .
7. Close the hood.