Control Module Replacement

PCM Pick-up/Utility:

Replacement of the Powertrain Control Module (PCM) consists of a service controller, without a PROM (MEM-CAL).

If the diagnostic procedures require the PCM to be replaced, the PCM, PROM (MEM-CAL) should be checked for the correct part number. If they are correct, remove the PROM (MEM-CAL), and install them in the control module. The control module will not contain a PROM (MEM-CAL).

NOTE: When replacing a production PCM with a control module, transfer the broadcast code and production PCM part number to the control module label. Do not record information on the access cover.

CAUTION:
1. The ignition must be "OFF," when disconnecting or reconnecting the PCM connector, to prevent internal damage to the PCM.
2. To prevent possible Electrostatic Discharge damage to the PCM, Do Not touch the connector pins or soldered components on the circuit board.

NOTE: The service of the powertrain control module varies between vehicle service. Refer to MEM-CAL service. PROM or Mem-Cal Replacement

REMOVE OR DISCONNECT
1. Negative battery cable.
2. Dash panel below glove box.
3. PCM retaining screw and PCM.
4. PCM harness connector.
5. Mounting brackets and modules, if equipped.
6. Access cover PROM (MEM-CAL). Refer to PROM (MEM-CAL) service. PROM or Mem-Cal Replacement

INSTALL OR CONNECT
1. PROM (MEM-CAL) and access cover in new PCM. Refer to PROM (MEM-CAL) service. PROM or Mem-Cal Replacement
2. Mounting brackets and modules, if equipped.
3. PCM harness connectors.
4. VSS buffer connector, if removed.
5. Dash panel below glove box.
6. Negative battery cable.
7. Perform functional check.

FUNCTIONAL CHECK
1. Turn ignition ON.
2. Enter diagnostics.

A. Diagnostic Trouble Code (DTC) 12 should flash four times (if no other DTC[s] are present). This indicates the PROM (MEM-CAL) is installed properly, and the PCM is functioning.
B. If DTC 51 occurs, or if the MIL is "ON" constantly with no DTC(s), the PROM (MEM-CAL) is not fully seated or is defective.

^ If not fully seated, press firmly on the ends of the PROM (MEM-CAL).

^ If it is necessary to remove the PROM (MEM-CAL), follow the previous removal instructions.

NOTE: To prevent possible Electrostatic Discharge damage to the PROM (MEM-CAL), Do Not touch the component leads, and Do Not remove integrated circuit from carrier.