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.

Caution:

* Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage.

* Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.

* In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.

* Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.

* The replacement control module must be programmed.

Note: Before removing the engine control module (ECM), use the scan tool to capture the ECM data. This captured data will then need to be restored into the NEW ECM. Refer to Control Module References Control Module References.

Removal Procedure




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 (Rear Liner) Front Wheelhouse Liner Replacement (Front 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 (Rear Liner) Front Wheelhouse Liner Replacement (Front Liner) .

5. If a new ECM is being installed, program the ECM. Refer to Control Module References Control Module References.