Dodge Ram 2004 Service Manual page 299

*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC —
TEST
4 Turn the ignition off.
Disconnect the DRBIII from the DLC.
Disconnect the PCM harness connectors.
Measure the resistance between the PCM SCI Transmit circuit and the PCM SCI
Receive circuit at the Data Link harness connector (cavs 7 and 12).
Is the resistance below 5.0 ohms?
Yes → Repair the short between the PCM SCI Transmit and the PCM
→ Go To 5
No
5 Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the DRBIII from the DLC.
Measure the resistance between ground and the PCM SCI Transmit circuit at the
Data Link harness connector (cav 7).
Is the resistance below 5.0 ohms?
Yes → Repair the PCM SCI Transmit circuit for a short to ground.
→ Go To 6
No
6 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the DRBIII from the DLC.
Measure the resistance between ground and the PCM SCI Receive circuit in the Data
Link harness connector (cav 12).
Is the resistance below 5.0 ohms?
Yes → Repair the PCM SCI Receive circuit for a short to ground.
→ Go To 7
No
7 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the DRBIII from the DLC.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the PCM SCI Receive circuit from the Data Link harness
connector (cav 12) to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 8
→ Repair the PCM SCI Receive circuit for an open.
No
ACTION
SCI Receive circuits.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 1.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 1.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 1.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 1.
285
COMMUNICATION
Continued
APPLICABILITY
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All
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All