Symptom:
U0140-NO BODY BUS MESSAGES
When Monitored and Set Condition:
U0140-NO BODY BUS MESSAGES
When Monitored: Engine running. Battery voltage greater than 10.0 volts.
Set Condition: No BUS messages recieved from the BCM for 20 seconds.
POSSIBLE CAUSES
DTC RESET
COMMUNICATE WITH BCM
PCI BUS CIRCUIT OPEN
PCM
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase DTCs.
Start the engine on and off several times. Leave the engine running for at least 20
second each time.
With the DRBIIIt, read DTC’s.
Does the DTC reset?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2 Turn the ignition on.
With the DRBIIIt, attempt to communicate with the BCM.
Can communication be established with the BCM?
All
Yes → Go To 3
No → Refer to the Communication Category and perform the appropri-
ate symptom related to no communication with BCM.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
289
DRIVEABILITY - NGC
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