Engine Control Module: Service and Repair

Powertrain Control Module (PCM):

Service of the PCM should normally consist of either replacement of the PCM or a MEM-CAL change. If the diagnostic procedures call for the PCM to be replaced, the Memory-Calibration unit (MEM-CAL) and PCM should be checked first to see if they are the correct parts. Also, perform the PCM Replacement Check, CHART C-1, before replacing the PCM to assure that the replacement PCM will not be damaged.

When replacing a production PCM with a service PCM, transfer the broadcast code and production number from the production unit to the service unit. Also, during replacement, the PROM, and the MEM-CAL must be removed from the PCM being replaced and transferred to the new unit.

1. Disconnect battery ground cable.
2. Then disconnect two computer electrical connectors.
3. Remove computer mounting hardware.
4. Remove computer from passenger compartment.
5. Reverse procedure to install.