Engine Control Module: Service and Repair

Engine Control Module Replacement

Service of the engine control module (ECM) should consist of either replacement of the ECM of programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM.

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 engine oil life percentage remaining. Use the scan tool to reset the engine oil life remaining back to the original percentage recorded.

Note: 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. Prepare the engine control module (ECM) for replacement. Refer to Control Module References Control Module References.

2. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.





Caution:
In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

3. Disconnect the ECM wiring harness plugs (1) from the ECM.




4. Remove the ECM bracket (1) along with the ECM (2) from the battery tray.

5. Unclip the retainer clip (3).

6. Remove the ECM (2) from the ECM bracket (1).

Installation Procedure





Note: The retainer clip (3) must engage safely.

1. Install the ECM (2) to the ECM bracket (1).

2. Install the ECM bracket (1) along with the ECM (2) to the battery tray.





Note: The safety locks on the ECM wiring harness plugs (1) must engage safely.

3. Connect the ECM wiring harness plugs (1) to the ECM.

4. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.

5. Program the engine control module, if required. Refer to Engine Control Module Programming and Setup Testing and Inspection.

6. Turn OFF the ignition for at least 5 seconds after the programming event is complete.