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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Information Center - Instrumentation, Message Center, And Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AH: The CHECK FUEL FILL INLET Message Is Inoperative/Always On >> Normal Operation

Normal Operation

The PCM monitors the fuel tank evaporative emissions system for significant leaks that occur following refueling of the vehicle. Once the PCM detects a fuel vapor leak, the PCM sends the Instrument Panel Cluster (IPC) a message over the High Speed Controller Area Network (HS-CAN) communication bus 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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