Cavalier L4-2.2L VIN 4 (1998)
Powertrain Control Module: Service and Repair
Powertrain Control Module (PCM) Replacement/Programming
Repair Instructions
NOTICE: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
Service of the PCM should normally consist of either replacement of the PCM or 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: Turn the ignition switch OFF to prevent internal PCM damage when disconnecting or reconnecting power to the PCM (for example,
battery cable, PCM pigtail, PCM fuse, jumper cables, etc.). The ignition switch should be OFF for at least 10 seconds before disconnecting the 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 RH engine splash shield.
3. Disconnect the horn electrical connector.
4. Remove the horn attaching bolt and the horn.
NOTICE: Do not touch the PCM connector pins or soldered components on the circuit board in order to prevent possible Electrostatic Discharge
(ESD) damage. Do not remove the integrated circuit boards from the carrier.
5. Disconnect the PCM electrical connectors (1).
6. Remove the PCM retainer attaching bolts (1).
