U1411

U1411-IMPLAUSIBLE FUEL VOLUME SIGNAL RECEIVED

U1411-Implausible Fuel Volume Signal Received:

WHEN MONITORED:
Ignition on.

SET CONDITION:
The fuel volume message the PCM is receiving is implausible. The circuit is continuously monitored. One trip fault.

POSSIBLE CAUSES
- CAN B open or shorted
- Cluster module
- Front control module
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Theory of Operation
The Front Control Module isn't receiving a fuel volume signal over CAN B from the Cluster Module. The FCM has to send the PCM a fuel volume signal over CAN C. The signal the FCM sends over CAN C is implausible.

Diagnostic Test

1. ACTIVE DTC

Ignition on, engine not running.
With a scan tool read DTCs.

Q: Is the DTC active at this time?

YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Component Tests and General Diagnostics
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. CAN B BUS HARDWARE DTCS ALSO ACTIVE

With a scan tool check for DTCs in the FCM.

Q: Are any CAN B Hardware related DTCs active at this time?

YES: Refer to Body Control Systems for the appropriate diagnostic procedures. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace and program the Powertrain Control Module. Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test