U1403

U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL RECEIVED

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

Theory of Operation

The fuel level signal is a direct input to the Totally Integrated Power Module (TIPM). The Powertrain Control Module (PCM) receives the fuel level signal from the TIPM over the CAN C bus circuit.

- When Monitored:
Ignition on.

- Set Condition:
The fuel volume message the Powertrain Control Module (PCM) is receiving is implausible. The circuit is continuously monitored. One Trip fault.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC

NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

1. Ignition on, engine not running.
2. With a scan tool, select View PCM DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM) ALSO ACTIVE
1. With the scan tool, select View DTCs.

Is the U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM) also set?

Yes

- Perform the U0141-Lost Communication with IPM (FCM/TIPM) diagnostic procedure. Testing and Inspection.

No

- Replace and program the Powertrain Control Module (PCM). PCM/ECM/TCM Reprogramming.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.