Dodge Ram 2004, Service Manual

Page: 310 / 642

Symptom:
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE
POSSIBLE CAUSES
NO RESPONSE FROM TRANSMISSION CONTROL MODULE
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT(S) OPEN
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Note: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, attempt to communicate with the Instrument Cluster.
With the DRB, attempt to communicate with the Airbag Control Module.
Was the DRB able to I/D or establish communications with both of the modules? All
Yes
→
Go To 2
No
→
Refer to the Communications category and perform the appropri-
ate symptom.
Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICA-
TION TEST - VER 1.
2 Turn the ignition off.
Disconnect the PCM harness connectors.
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.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe both Fused Ignition Switch
Output circuits (cavs 11 and 12) in the appropriate terminal of special tool #8815.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Is the test light illuminated for both circuits? All
Yes
→
Go To 3
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Refer to the wiring diagrams located in the Service Information.
Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICA-
TION TEST - VER 1.
296
COMMUNICATION