U0431

U0431-IMPLAUSIBLE DATA RECEIVED FROM FCM

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

- When Monitored:
With the ignition on for four seconds, no CAN BUS circuit error condition present, no lost communication with Front Control Module (FCM) condition present, and no system undervoltage or overvoltage condition present.

- Set Condition:
The Final Drive Control Module (FDCM) is receiving no message or implausible data for ambient temperature.





WARNING: On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury

1. CHECK FOR DTC U0431-IMPLAUSIBLE DATA RECEIVED FROM FCM

NOTE: This DTC must be active for the results of this test to be valid.

1. Ignition on, engine off.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.

Does the scan tool display: U0431-IMPLAUSIBLE DATA RECEIVED FROM FCM?

Yes

- Go To 2

No

- Stored Lost Communication DTCs Perform the Lost Stored Communication DTC diagnostic procedure.

2. CHECK IF FCM CAN BUS DTCS ARE PRESENT
1. With the scan tool, read FCM DTCs.

Are there any FCM CAN BUS DTCs present?

Yes

- Perform the appropriate diagnostic procedure Testing and Inspection.

No

- Go To 3

3. CHECK IF POWERTRAIN CONTROL MODULE DTCS ARE PRESENT
1. With the scan tool, read Engine DTCs.

Are there any Powertrain Control Module DTCs present?

Yes

- Perform the appropriate diagnostic procedure Testing and Inspection.

No

- Using the schematics as a guide, check the Final Drive Control Module (FDCM) pins, terminals, and wiring harness connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Final Drive Control Module (FDCM).
- Perform the TRANSFER CASE VERIFICATION TEST .