Montana V6-3.4L VIN E (2002)
Engine Control Module: Service and Repair
Powertrain Control Module (PCM) Replacement
NOTE: In order to prevent possible electrostatic discharge damage to the PCM, do not touch the connector pins or soldered components on the circuit
board.
Powertrain Control (PCM) Module
Service of the powertrain control module (PCM) should normally consist of either replacement of the PCM or electrically erasable programmable read
only memory (EEPROM) programming. If the diagnostic procedures call for PCM replacement, test the PCM first to see if the PCM is the correct part.
If the PCM is faulty, remove the PCM and install a new service PCM.
The new service PCM is not programmed. You must program the new PCM. DTC P0602 indicates the EEPROM is not programmed or has
malfunctioned.
NOTE: Turn the ignition OFF when installing or removing the PCM connectors and disconnecting or reconnecting the power to the PCM (battery
cable, PCM pigtail, PCM fuse, jumper cables, etc.) in order to prevent internal PCM damage.
IMPORTANT: When replacing the production PCM with a service PCM (controller), you must transfer the broadcast code and production PCM
number to the service PCM label. Do not record the information on the PCM cover. This allows positive identification of PCM parts throughout the
service life of the vehicle.
Removal Procedure
1. Remove the coolant reservoir retaining fastener.
2. Remove the coolant reservoir and set aside.
