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Pinpoint Test Ai: The Check Fuel Fill Inlet Message Is Inoperative/Always On: Notes

Pinpoint Test AI: The CHECK FUEL FILL INLET Message Is Inoperative/Always On 

Normal Operation 

The PCM monitors the fuel tank evaporative emission system for significant leaks that occur following refueling of the vehicle. Once the PCM detects a fuel vapor leak, the PCM sends a message to the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) to turn on the CHECK FUEL FILL INLET message. The PCM only sets DTC P0457 following a successful cruise test, which is initiated when the vehicle is driven at a steady speed above 64 km/h (40 mph) for a duration of approximately 4-5 minutes. If the PCM is unable to successfully run the cruise test, the IPC does not receive the fuel inlet status and the CHECK FUEL FILL INLET message remains off.

If the IPC does not receive the fuel inlet status from the PCM for 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the CHECK FUEL FILL INLET message off.

This pinpoint test is intended to diagnose the following: 

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