Engine Control Module: Service and Repair

POWERTRAIN CONTROL MODULE (PCM) REPLACEMENT

Service of the powertrain control module (PCM) should normally consist of either replacement of the PCM or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be inspected first to see if the correct part is being used.

NOTE: Turn the ignition OFF when installing or removing the PCM connectors and disconnecting or reconnecting the power to the PCM (battery cable, PCM pigtail, PCM fuse, jumper cables, etc.) in order to prevent internal PCM damage.

IMPORTANT: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.

Removal Procedure




1. Disconnect the negative battery cable.

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




2. Move the PCM retention bar and retainer away from the PCM.




3. Remove the PCM from the PCM mounting bracket.
4. Disconnect the PCM electrical connectors.

Installation Procedure
1. Remove the replacement PCM from the packaging.




2. Verify the service number in order to ensure the service number is the same number as the faulty PCM.




3. Connect the PCM electrical connectors.

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten the PCM electrical connectors screws to 8 N.m (71 lb in).




4. Slide the PCM retainer into the PCM bracket slots.
5. Pull the PCM retention bar into position.
6. Connect the negative battery cable.
7. Program the PCM. Programming and Relearning