Engine Control Module: Service and Repair

Engine Control Module Replacement

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:
* 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.
* It is necessary to record the remaining automatic transmission fluid life. If the replacement module is not programed with the remaining automatic transmission fluid life, the automatic transmission fluid life will default to 100 percent. If the replacement module is not programmed with the remaining automatic transmission fluid life, the automatic transmission fluid will need to be changed at 83000 km (50,000 mi) from the last automatic transmission fluid change.

Removal Procedure




1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
2. Slide the engine control module (ECM) retainer rearward, disengaging the retainer from the battery shield.
3. Remove the ECM retainer from the top of the battery shield.




4. Remove the ECM from the retainer. Reposition the ECM out of the way.




5. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Service and Repair).
6. Place the battery shield over the battery.
7. Place the ECM on top of the battery shield.
8. Disconnect the engine wiring harness electrical connectors (2) from the ECM.

Installation Procedure




1. Connect the engine wiring harness electrical connectors (2) to the ECM. Reposition the ECM out of the way.
2. Remove the battery shield from over the battery.
3. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Service and Repair).




4. Install the ECM to the retainer.




5. Position the ECM and retainer to the top of the battery shield.
6. Slide the ECM retainer rearward, engaging the retainer to the battery shield.
7. Reprogram the PCM. Refer to Control Module References (Programming and Relearning).