Dodge Ram 2004 Service Manual page 274

COMMUNICATION
FCM - PCM MESSAGES NOT RECEIVED —
TEST
3 Turn the ignition off.
Disconnect the PCM harness connector.
CAUTION: IF NGC, DO NOT PROBE THE PCM HARNESS CONNECTORS.
PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM
TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION.
INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Disconnect the DRBIII from the DLC.
Measure the resistance of the PCI Bus circuit between the PCM connector (from
special tool #8815 if NGC) and the DLC.
Is the resistance below 5.0 ohms?
Yes → Replace and program the Powertrain Control Module in accor-
→ Repair the PCI Bus circuit for an open.
No
ACTION
dance with the service information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
Perform BODY VERIFICATION TEST - VER 1.
Continued
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APPLICABILITY
All