Engine Control Module: Service and Repair

POWERTRAIN CONTROL MODULE (PCM) REPLACEMENT

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

Removal Procedure

IMPORTANT:
- To prevent internal PCM damage, the ignition switch must be OFF when disconnecting or connecting power to the PCM.
- Remove any debris from around the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
- The replacement PCM must be programmed.

1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.

IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.




2. Disconnect the negative battery cable.
3. If equipped with regular production option (RPO) NYS, remove the harness ground clip from the PCM cover.
4. If equipped with RPO HP2, remove the hybrid control module (HCM).




5. If vehicle is NOT equipped with RPO HP2, perform the following:
1. Release the PCM cover mounting tabs.
2. Release the PCM cover from the mounting bracket.
3. Remove the PCM cover.




6. If vehicle is equipped with RPO HP2, perform the following:
1. Release the PCM cover mounting tabs.
2. Release the PCM cover from the mounting bracket.
3. Remove the PCM cover.




7. Loosen the PCM electrical connector bolts (2).

NOTE:
- Refer to PCM and ESD Notice in Service Precautions.
- In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

8. Disconnect the PCM electrical connectors.




9. Release the spring latch from the PCM.
10. Release the PCM mounting tabs from the PCM.
11. Remove the PCM.

Installation Procedure




1. Install the PCM.Ensure that the mounting tabs are engaged.
2. Secure the spring latch to the PCM.




3. Connect the PCM electrical connectors.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Tighten the PCM electrical connector bolts (2).

Tighten the bolts to 8 N.m (71 lb in).




5. If vehicle is equipped with RPO HP2, install the PCM cover.




6. If vehicle is NOT equipped with RPO HP2, install the PCM cover.




7. If equipped with RPO HP2, install the HCM.
8. If equipped with RPO NYS, install the harness ground clip to the PCM cover.
9. Connect the negative battery cable.
10. If a NEW PCM was installed, program the PCM. Programming and Relearning