Final Drive Control Module (FDCM)

U0155-NO CLUSTER BUS MESSAGE

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Ignition key on and battery voltage greater than 10.4 volts.

- Set Condition:
No messages received from the MIC (Instrument Cluster) for more than 20 seconds. One Trip Fault. Three good trips to turn off the MIL.





Perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, erase DTCs.
3. Cycle the ignition key on and off several times.
4. With the scan tool, read DTCs.

Does the DTC reset?

Yes

- Go To 2

No

- Go To 4

2. COMMUNICATE WITH CLUSTER
1. With the scan tool, attempt to communicate with the Instrument Cluster.

Can communication be established with the Instrument Cluster?

Yes

- Go To 3

No

- Totally Integrated Power Module (TIPM) Perform the U0155-Lost Communication with Cluster/CCN diagnostic procedure.

3. INSTRUMENT CLUSTER OPERATION
1. Start the engine
2. Allow the engine to idle.

Is the correct engine speed display in the instrument cluster (Tach)?

Yes

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Testing and Inspection Perform the appropriate diagnostic procedure.

4. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

Were there any problems found?

Yes

- Repair as necessary.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test.

No

- Test complete.