Powertrain Control Module (PCM) Replacement

PCM Replacement/Programming (Replacement)

Notice: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

Note: Service of the PCM should normally consist of either replacement of the PCM, EEPROM re-programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be checked first to see if it is the correct part. DTC P0601 indicates the EEPROM programming has malfunctioned. When DTC P0601 is obtained, re-program the EEPROM. The ignition should be OFF for at least 10 seconds before disconnecting power to the PCM so the IAC valve has time to move to the engine OFF position.

Removal Procedure

Important: To prevent internal PCM damage, the ignition must be off when disconnecting or reconnecting power to PCM (for example, battery cable, PCM pigtail, PCM fuse, jumper cables, etc.). The ignition should be OFF for at least 10 seconds before disconnecting power to the PCM so the IAC valve has time to move to the engine OFF position.

1. Disconnect the negative battery cable.
2. Remove the LH hush panel.
3. Loosen the PCM connector screws (1).

Notice: In order to prevent possible electrostatic discharge damage to the PCM, do not touch the connector pins or soldered components on the circuit board. Do not remove the integrated circuit boards from the carrier.

4. Disconnect the PCM electrical connectors.
5. Remove the PCM Retainer.
6. Slide the PCM from the PCM bracket.

Installation Procedure
Remove the new PCM from its packaging and check the service number to make sure it is the same number or updated number as the faulty PCM.

1. Slide the PCM into the PCM bracket.
2. Install the PCM Retainer.

Notice: In order to prevent possible electrostatic discharge damage to the PCM, do not touch the connector pins or soldered components on the circuit board. Do not remove the integrated circuit boards from the carrier.

3. Install the PCM electrical connectors.
4. Tighten the PCM connector screws (1).
5. Install the LH hush panel.
6. Connect the negative battery cable.

Important: Replacement PCMs must be reprogrammed and the crankshaft position system variation procedure must be performed. Refer to the latest Techline information for PCM programming and Crankshaft Position System Variation Procedure. Testing and Inspection

7. Reprogram the PCM.