Pinpoint Tests AG: The CHECK FUEL FILL INLET Message Is Inoperative/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AG: 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 the Instrument Cluster (IC) a message over the communication network 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 IC does not receive the fuel inlet status the CHECK FUEL FILL INLET message remains off.
If the IC does not receive the fuel inlet status from the PCM for 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the CHECK FUEL FILL INLET message off.
NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative speedometer, temperature gauge or odometer.
- DTC P0457 (Evaporative Emission System Leak Detected) (Fuel Cap Loose/Off) - sets in the PCM if a fuel tank pressure change greater than -23.7 kPa (-7 in-Hg) of vacuum within 30 seconds after refueling occurs, or there is an excessive purge (fuel vapor) flow of greater than 454 g (1.0 lb) per minute.
This pinpoint test is intended to diagnose the following:
- Evaporative fuel system concern
- PCM
- IC
PINPOINT TEST AG: THE CHECK FUEL FILL INLET MESSAGE IS INOPERATIVE/ALWAYS ON
