Engine Control Module: Service and Repair

Engine Control Module Replacement

Note: In order to prevent internal ECM damage, the ignition must be OFF when you disconnect or reconnect the power to the ECM. For example, disconnect the power when you work with the following components:

* A battery cable

* The ECM pigtail

* The ECM fuse

* Jumper cables

Note: When you diagnose or replace the ECM, remove any debris from the ECM connector surfaces before servicing the ECM module connector gaskets. Make sure that the gaskets are installed correctly. The gaskets prevent contamination intrusion into the ECM.

Note: The replacement ECM MUST be programmed.

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, inspect the ECM first to see if the correct part is being used.

Removal Procedure

Note: Record the current engine oil life percentage and use a scan tool to update the NEW ECM, if replacing.

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 (Primary) Battery Negative Cable Disconnection and Connection (Primary)Battery Negative Cable Disconnection and Connection (Auxiliary) Battery Negative Cable Disconnection and Connection (Auxiliary).

3. Remove the junction block. Refer to Underhood Electrical Center or Junction Block Replacement Service and Repair.




4. Remove the ECM bracket fasteners (1).

5. Release the ECM retaining clips (1) and detach the ECM (2).




6. Remove the ECM bracket fastener (1) and partially loosen the rear ECM bracket fastener (2).




7. Move the connector lock levers to the unlock position and disconnect the ECM electrical connectors (1).




8. Release the plastic retaining tabs (1) and remove the ECM (2).

Installation Procedure





Caution:
Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.

Caution:
In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

1. Engage the ECM retaining clips (1) to secure the ECM (2).




2. Connect the ECM electrical connectors (1).




3. Reposition the ECM bracket and tighten the fasteners (1) and (2) to 22 Nm (16 lb ft).




4. Install the upper bracket fasteners (1) and tighten to 22 Nm (16 lb ft).

5. Install the junction block. Refer to Underhood Electrical Center or Junction Block Replacement Service and Repair.

6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Primary) Battery Negative Cable Disconnection and Connection (Primary)Battery Negative Cable Disconnection and Connection (Auxiliary) Battery Negative Cable Disconnection and Connection (Auxiliary).

7. If a new ECM is being installed, program the ECM. Refer to Service Programming System (SPS) Service Programming System (SPS).