Engine Control Module: Service and Repair

Powertrain Control Module (PCM) Mounting:

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.


CAUTION: The ignition switch should always be "OFF" when installing or removing a PCM connector.

REMOVE OR DISCONNECT

1. Right hand hush panel.
2. Remove door surround molding and carpet retainer. Fold carpet and pad away from the kick panel to expose the green connector.
3. Connectors to PCM.
4. PCM retaining screws.
5. Glove compartment liner.
6. Loosen the two upper mounting screws of the PCM mounting bracket.
7. Move PCM rearward to disengage the front mounting pin.
8. Pull PCM down.
9. Bracket, top and front mounting pins from PCM (if replacing PCM).
10. MEM-CAL cover and MEM-CAL.

INSTALL OR CONNECT

1. Old MEM-CAL in new PCM.
2. Bracket and mounting pins to new PCM.
3. PCM.
4. PCM retaining screws.
5. PCM connectors.
6. Glove box liner.
7. Carpet and molding.
8. Hush panel.


VERIFY PROPER INSTALLATION

1. Turn ignition "ON".
2. Enter diagnostics.
^ Code E052 should appear.
^ If the diagnostic message "NO PCM DATA" appears on the display, the MEM-CAL may be defective or not fully seated.
3. Perform TPS/Idle learn procedure.

NOTE: Failure to perform the TPS/Idle learn procedure may result in severe driveablity problems.