U1403

U1403-IMPLAUSIBLE FUEL LEVEL SIGNAL RECEIVED



Theory of Operation

The PCM receives:

A/C Pressure, Ambient Air Temperature and Fuel Level CAN bus messages from the Totally Integrated Power Module (TIPM).

- When Monitored:
With the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than 3 seconds.

- Set Condition:
The PCM either doesn't receive a bus message or receives an implausible bus message from the Instrument Cluster (CCN).





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

NOTE: Diagnose and repair any related sensor or communication DTCs in the Instrument Cluster (CCN) before continuing with this test.

1. Start the engine and allow it to reach operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.

2. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- U0121 Perform the U0121-Loss Communication with ABS Module diagnostic procedure.

No

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