K 1500 Truck 4WD V8-4.8L VIN V (1999)
Engine Control Module: Service and Repair
PCM Replacement/Programming
Service of the PCM should normally consist of either replacement of the PCM or EEPROM 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. If it is, remove the faulty PCM and install the new service PCM.
THE SERVICE PCM EEPROM WILL NOT BE PROGRAMMED. DTC P0601 and P0602 indicates the EEPROM is not programmed or has
malfunctioned.
IMPORTANT: The following must be performed anytime the PCM is replaced:
1. Programming of the EEPROM
2. The PCM Password learn procedure. Refer to DTC P1631 Theft Deterrent Password Incorrect.
3. The Idle Learn Procedure. Refer to PCM Idle Learn Procedure.
4. The CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure.
5. Reset the Engine Oil Life monitor. Refer to Engine Oil Life Monitor Reset Procedure.
6. The Functional Check
The following must be performed anytime the PCM is disconnected, loses power, or is reprogrammed.
1. The Idle Learn Procedure. Refer to PCM Idle Learn Procedure.
2. The Functional Check
IMPORTANT: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM (for example,
battery cable, PCM pigtail, PCM fuse, jumper cables, etc.).
REMOVAL PROCEDURE
IMPORTANT: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets
when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.
1. Release the PCM cover mounting holes (1, 5) away from the mounting tabs on the PCM mounting bracket.
2. Release the PCM cover (8) from the mounting bracket.
3. Remove the PCM cover.
NOTE: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD)
damage to the PCM.
NOTE: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
