Express 3/4 Ton Van V8-4.8L VIN V (2003)
Engine Control Module: Service and Repair
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:
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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.
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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.
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The replacement PCM must be programmed.
Removal Procedure
1. Remove the air cleaner assembly.
2. Disconnect the negative battery cable.
3. Disconnect the PCM harness connectors.
NOTE: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD)
damage to the PCM.
4. Release the spring latch from the PCM.
5. Lift the PCM from the PCM mounting tray.
6. Remove the PCM from the engine compartment.
Installation Procedure
1. Install the PCM to the PCM mounting tray.
