Driver/Vehicle Information Display: Testing and Inspection
PINPOINT TEST 2: THE CHECK FUEL FILL INLET MESSAGE IS NEVER/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 a message over the high speed controller area network (HS-CAN) communication network to turn on CHECK FUEL FILL INLET message. DTC P0457 sets in the PCM 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 instrument cluster does not receive the message from the PCM and the CHECK FUEL FILL INLET message remains off.If the instrument cluster does not receive the fuel fill inlet data from the PCM for 5 seconds or less, the instrument cluster defaults the CHECK FUEL FILL INLET message to the last setting, based upon the last known good data message. If the instrument cluster does not receive the fuel fill inlet data from the PCM for more than 5 seconds or if the data received is deemed invalid, the instrument cluster sets DTC U0100 in continuous memory and defaults the CHECK FUEL FILL INLET message off.
NOTE:If DTC U0100 is set in the instrument cluster, other observable symptoms may be an inoperative speedometer, temperature gauge (except Hybrid) 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.
Possible Causes
- Evaporative emissions concern
- PCM
- Instrument cluster
Diagnostic Procedure
