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. Use the procedure in this section.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cables.



2. Disconnect the connectors from the PCM.
3. Remove the PCM from under the dash on the driver's side.

Important: 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.

1. Install the PCM mounting hardware.
2. Connect the connectors to the PCM.
3. Install the PCM from under the dash on the driver's side.
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.

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).
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.

The PCM will automatically activate the TDC Offset program when the engine coolant is greater than 77°C (170°F). If the PCM is not programmed with a TDC Offset, a DTC P1214 will set.