Pinpoint Tests AK: The Check Fuel Fill Inlet Message Is Inoperative/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AK: 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 Panel Cluster (IPC) 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 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.

NOTE: If DTC U0100:00 is set in the IPC, 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 the PCM detects a significant fuel tank pressure change after refueling occurs.

This pinpoint test is intended to diagnose the following:

- Evaporative fuel system concern
- PCM
- IPC

PINPOINT TEST AK: THE CHECK FUEL FILL INLET MESSAGE IS INOPERATIVE/ALWAYS ON

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AK1 CHECK THE MESSAGE CENTER OPERATION

- Close all doors.
- Ignition ON.
- Open the driver door while monitoring the message center displays.
- Does the message center display DRIVER DOOR AJAR?

Yes
GO to AK2.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

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AK2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Is DTC P0457 recorded?

Yes
If the CHECK FUEL FILL INLET message is illuminated, REFER to Computers and Control Systems.

If the CHECK FUEL FILL INLET message is not illuminated, GO to AK3.

No
If the CHECK FUEL FILL INLET message is always on, INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

If the check fuel cap indicator is not illuminated, the system is operating normally at this time. If the fuel cap was left off and the CHECK FUEL FILL INLET message did not turn on, driving conditions may not have allowed for the PCM to run the cruise test and message the IPC to turn the CHECK FUEL FILL INLET message on.

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AK3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Are any DTCs recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test AT. Pinpoint Tests AT: DTC U0100:00

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

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