U1403

U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL



Theory of Operation

The Totally Integrated Power Module (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.

- When Monitored:
Ignition on.

- Set Condition:
The fuel level message that the Powertrain Control Module (PCM) is receiving is implausible. The circuit is continuously monitored.





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

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.

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

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the CHECKING FOR AN INTERMITTENT DTC diagnostic procedure. Checking for an Intermittent DTC.

2. CAN B BUS COMMUNICATION DTCS ALSO ACTIVE
1. With a scan tool select View DTCs in the TIPM.

Are any CAN B Bus DTCs active?

Yes

- Testing and Inspection for diagnostic procedures and for further possible causes.

No

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