Engine Control Module: Service and Repair

The PCM engine control strategy prevents reduced idle speeds until after the engine operates for 320 km (200 miles). If the PCM is replaced after 320 km (200 miles) of usage, update the mileage and vehicle identification number (VIN) in the new PCM. Use the DRB scan tool to change the millage and VIN in the PCM. If this step is not done a Diagnostic Trouble Code (DTC) may be set. Refer to the appropriate Powertrain Diagnostic and the DRB scan tool.

The PCM attaches to a bracket between the air cleaner housing and Power Distribution Center (PDC).

REMOVAL

Auxiliary Jumper Terminal:

1. Disconnect negative cable from auxiliary jumper terminal.
2. Disconnect both 40-way connectors from PCM.

PCM Bracket Screws:

3. Remove screws attaching PCM to bracket.
4. Lift PCM up to remove it from vehicle.

INSTALLATION
1. Install PCM. Tighten mounting screws.
2. Attach both 40-way connectors to PCM.
3. Connect negative cable to auxiliary jumper terminal.

IMPORTANT NOTE: If the Powertrain Control Module has been changed and the correct VIN and mileage have not been programmed, a DTC will be set in the ABS, Airbag and SKIM modules when equipped. In addition, if the vehicle is equipped with a Sentry Key immobilizer Module (SKIM), Secret Key data must be updated to enable starting.

For ABS and Airbag systems:
1. Enter correct VIN and Mileage in PCM.
2. Erase codes in ABS and Airbag modules.

For SKIM Theft Alarm:
1. Connect the DRB to the data link connector.
2. Go to Theft Alarm, Skim, Misc. and place the SKIM in secured access mode, by using the appropriate PIN code for this vehicle.
3. Select Update the Secret Key data, data will be transferred from the SKIM to the PCM (This is required to allow the vehicle to start with the new PCM).
4. If three attempts are made to enter secured access mode using the incorrect PIN, secured access mode will be locked out for one hour. To exit this lock out mode, leave the ignition key in the Run/Start position for one hour. Ensure all accessories are turned off. Also monitor the battery state and connect a battery charger if necessary.