Sunfire L4-138 2.3L DOHC VIN D MFI (1995)
Engine Control Module: Service and Repair
PCM Location
Powertrain Control Module (PCM)
Removing Knock Sensor Module From PCM
PCM AND KNOCK SENSOR SERVICE
Service of the Powertrain Control Module (PCM) should normally consist of either replacement of the PCM or a EPROM change.
If the diagnostic procedures call for the PCM to be replaced, the PCM should be checked to see if it is the correct part. If it is, remove the Knock
Sensor (KS) module from the faulty PCM and install it in the new service PCM. THE SERVICE PCM WILL NOT CONTAIN A KS MODULE.
Diagnostic Trouble Code (DTC) P0601 indicates the EEPROM programming has malfunctioned. When DTC P0601 is obtained, reprogram the
EEPROM. If a DTC P0325 is set, check the KS module for proper installation. If it is installed correctly and DTC P0325 is still displayed, replace
the KS module.
NOTE: When replacing the production PCM with a service PCM (controller), it is important to transfer the broadcast code and production PCM
number to the service PCM label. Please do not record on PCM cover. This will allow positive identification of PCM parts throughout the service
