Dodge Ram 2004 - No Response from Ecm (Pci Bus) - Diesel Only

Symptom:
*NO RESPONSE FROM ECM (PCI BUS) - DIESEL ONLY
POSSIBLE CAUSES
ECM PCI NO RESPONSE
PCI BUS CIRCUIT OPEN
ENGINE 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 DRBIIIt, enter Anti-Lock Brakes.
With the DRBIIIt, enter Body then Electro/Mechanical Cluster (MIC).
With the DRBIIIt, enter Passive Restraints then Airbag.
Were you able to establish communications with any of the modules?
All
Yes → Go To 2
No → Refer to symptom PCI Bus Communication Failure in the Com-
munications category.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
270
COMMUNICATION