Ascender 4WD L6-4.2L (2003)
Engine Control Module: Service and Repair
Removal and Installation
Powertrain Control Module (PCM) Replacement
Service of the powertrain control module (PCM) should normally consist of either replacement of the PCM or electrically erasable programmable read
only memory (EEPROM) programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be inspected first to see if the
correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM.
Important: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example, when
working with a battery cable, PCM pigtail, PCM fuse, or jumper cables.
Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when
diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
Removal Procedure
1. Loosen the PCM harness connector bolts (1) from the center of the PCM harness connectors.
2. Remove the PCM harness connectors (3) from the PCM (2).
3. Remove the four PCM body mounting bolts (4).
NOTE: Refer to PCM and ESD Notice in Cautions and Notices.
See: Service Precautions
4. Remove the PCM (2) from the intake manifold plenum.
Installation Procedure
1. Install the PCM (2) to the intake manifold plenum
2. Install the PCM mounting bolts (4).
3. Install the PCM harness connectors (3) to the PCM body.