U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL

For a complete wiring diagram Refer to Section 8W.

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. (Refer to 9 - ENGINE - STANDARD PROCEDURE).

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

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
Perform BODY VERIFICATION TEST – VER 1.

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)