Engine Control Module: Service and Repair

POWERTRAIN CONTROL MODULE (PCM) REPLACEMENT




Powertrain control module (PCM) service should normally consist of either PCM replacement or EEPROM programming. If the diagnostic procedures require PCM replacement, check the PCM first to see if the correct part is being used.

IMPORTANT:
- In order to prevent internal PCM damage, the ignition must be OFF when you disconnect or reconnect the power to the PCM. For example, disconnect the power when you work with the following components:
- A battery cable
- The PCM pigtail
- The PCM fuse
- The jumper cables
- When you diagnose or replace the PCM, remove any debris from the PCM connector surfaces before servicing the PCM module connector gaskets. Ensure that the gaskets are installed correctly. The gaskets prevent intrusion into the PCM.
- The replacement PCM MUST be programmed.

Removal Procedure
1. Remove the wheelhouse filler panel.
2. Remove the throttle actuator control (TAC) module.
3. Disconnect the PCM electrical harness connectors.
4. Loosen but do not remove the PCM rear retaining fastener. Use the rear retaining fastener as an anchor for the outer bracket.
5. Remove the front retaining fastener from the PCM.
6. Reposition the PCM outer bracket.




7. Remove the PCM from the bracket and the vehicle.

Installation Procedure




1. Install the PCM to the PCM rear bracket.
2. Position the PCM front bracket.

NOTE: Refer to Fastener Notice in Service Precautions.

3. Install the PCM front retaining fasteners.

Tighten
Tighten the PCM retaining fasteners to 2.0 N.m (17 lb in).




4. Connect the electrical connectors to the PCM.

Tighten
Tighten the PCM electrical connectors to 8 N.m (70 lb in).

5. Install the TAC module.
6. Install the wheelhouse filler panel.
7. If a new PCM is being installed, program the PCM. Refer to Service Programming System (SPS) in Programming. Programming and Relearning