Powertrain Control Module (PCM) Replacement

PCM Replacement/Programming
Service of the PCM should normally consist of replacement of the PCM. If the diagnostic procedures call for the PCM to be replaced, then programming the EEPROM in the PCM will be necessary.

REMOVAL PROCEDURE
1. Disconnect the negative battery cables.
2. Disconnect the connectors from the PCM.
3. Remove the PCM from the passenger compartment.

NOTE: To prevent possible electrostatic discharge to the PCM, do not touch the component leads, and do not remove the integrated circuit from the carrier.

4. Remove the PCM mounting hardware.

INSTALLATION PROCEDURE
1. Install the PCM mounting hardware.
2. Connect the connectors to the PCM.
3. Install the PCM in the passenger compartment behind the glove box.
4. Connect the negative battery cables.

The MIL, the antilock and the brake lamps will continue to be enabled until the PCM is programmed. Once the programming is complete, the lamps will be turned OFF and the normal operation will occur.

5. Go to PCM Programming.

PCM Programming

1. Perform the set up.

^ The battery is charged.
^ The ignition is ON.
^ The battery/cig. lighter connection is secure.
^ The Data Link Connector is attached.

2. Perform the programming. Refer to up to date Techline terminal/equipment for user instructions.

3. After the vehicle has been programmed, operate the vehicle until the coolant temperature is greater than 77°C (170°F). This will allow the TDC Offset to be programmed (refer to PCM Programming (TDC Offset) if necessary). TDC Offset Program Procedure

4. Check the data list for a TDC Offset.

5. If the PCM fails to reprogram, do the following:
^ Check all of the PCM connections.
^ Check the Techline terminal/equipment for the latest software version.
^ Try again to reprogram the PCM. If the reprogramming fails again, replace the PCM. Refer to PCM replacement.