PCM Replacement/Programming

Powertrain Control Module (PCM):

The Powertrain Control Module (PCM), located under the instrument panel, is the control center of the fuel injection system. It constantly looks at the information from various sensors, and controls the systems that affect emission or engine performance. The PCM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the Malfunction Indicator Lamp (MIL), and store a DTC or DTCs which identify the problem areas to aid the technician in making repairs.

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.




1. Disconnect the negative battery cable.
2. Remove the LH hush panel.
3. Loosen the PCM connector screws (1).

NOTE: Do not touch the PCM connector pins or soldered components on the circuit board in order to prevent possible Electrostatic Discharge (ESD) damage. Do not remove the integrated circuit boards from the carrier.




4. Disconnect the PCM electrical connectors.




5. Remove the PCM Retainer.
6. Slide the PCM from the PCM bracket.

INSTALLATION PROCEDURE
Remove the new PCM from its packaging and check the service number to make sure it is the same number or updated number as the faulty PCM.




1. Slide the PCM into the PCM bracket.
2. Install the PCM Retainer.

NOTE: Do not touch the PCM connector pins or soldered components on the circuit board in order to prevent possible Electrostatic Discharge (ESD) damage. Do not remove the integrated circuit boards from the carrier.

3. Install the PCM electrical connectors.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Tighten the PCM connector screws (1).




5. Reinstall the LH hush panel.

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

6. Connect the negative battery cable.
7. Program the EEPROM.

IMPORTANT: Replacement PCMs must be reprogrammed and the crankshaft position system variation learn procedure must be performed.

8. The PCM will need to relearn the crankshaft variation. Testing and Inspection