Fcm - Pcm Messages Not Received - Dodge Ram 2004 Service Manual

Symptom:

FCM - PCM MESSAGES NOT RECEIVED

When Monitored and Set Condition:
FCM - PCM MESSAGES NOT RECEIVED
When Monitored: Withe the ignition on.
Set Condition: The FCM does not receive any messages from the PCM for at least 5
seconds.
PCM MESSAGES NOT RECEIVED
ATTEMPT TO COMMUNICATE WITH THE PCM
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
1 Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then J1850 MODULE SCAN.
Is the PCM active on the BUS?
Yes → Erase DTC, if DTC resets replace the Front Control Module in
→ Go To 2
No
2 Turn the ignition on.
With the DRB, attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?
Yes → Go To 3
→ Refer to the communication category and perform the appropriate
No
POSSIBLE CAUSES
ACTION
accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
symptom.
Perform BODY VERIFICATION TEST - VER 1.
259
COMMUNICATION
APPLICABILITY
All
All