U1403

U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Ignition on.

- Set Condition:
The fuel level message that the PCM is receiving is implausible. The circuit is continuously monitored.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Theory of Operation

The TIPM receives a fuel level signal over CAN B from the Cluster. The TIPM transmits the fuel level message to the PCM over the CAN C bus.

Diagnostic Test

1. ACTIVE DTC
NOTE: Diagnose all CAN B and C communication DTCs before continuing.

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.

Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go To 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Intermittent Condition
- Perform the PCM Verification Test Ver. 1.Powertrain Verification Test

2. CAN B BUS COMMUNICATION DTCS ALSO ACTIVE
With a scan tool select View DTCs in the TIPM.
Are any CAN B Bus DTCs active?

Yes

- Refer to the appropriate diagnostic procedure.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test Ver. 1.Powertrain Verification Test