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.

IMPORTANT:
- To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example, the battery cable, PCM pigtail, PCM fuse, jumper cables, etc.
- 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.

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

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. Check the service number in order to ensure the service number is the same number as the defective PCM.




3. Connect the PCM electrical connectors.

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten
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