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 or 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: Before removing the 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. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.

3. Remove the battery and battery tray. Refer to Battery Tray Replacement Battery Tray Replacement.

4. Remove the under hood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement Underhood Electrical Center or Junction Block Replacement.

5. Disengage the engine wiring harness electrical connector retainers and remove the connectors (2) from the ECM (1).




6. Disengage the bracket retainer tabs (1) securing the ECM to the bracket.

7. Remove the ECM (3) from the bracket.

Installation Procedure




1. Set the bottom of ECM into the ECM bracket tab (2).

2. Push the ECM (3) in securing the ECM to the bracket.




3. Position the engine wiring harness electrical connectors and engage the retainers securing the connectors (2) to the ECM (1).

4. Install the under hood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement Underhood Electrical Center or Junction Block Replacement.

5. Install the battery and battery tray. Refer to Battery Tray Replacement Battery Tray Replacement.

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

7. If a NEW ECM was installed, perform the service programing system (SPS). Refer to Control Module References Control Module References.