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Pinpoint Test AO: The Low Fuel Warning RTT (RECONFIGURABLE Telltale) Is Never Or Always On

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    See Low Fuel. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    Possible Sources 

    • Communication concern
    • Fuel gauge concern
    • PCM
    • GWM
    • IPC

  2. AO1 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors and the hood.

    • Clear all message center warnings by pressing the OK button for each warning present.

    • Monitor the door ajar RTT warning indicator.

    • Open the driver door.

    • Clear the message center popup warning.

    • Monitor the door ajar RTT warning indicator.

    Is the door ajar RTT warning indicator off with the door closed, and on with the door open? 

    Yes  GO to  AO2
    No  GO to Pinpoint Test A 

  3. AO2 VERIFY THE OPERATION OF THE FUEL GAUGE

    • Ignition ON.

    • Verify the fuel gauge operates correctly and there are no customer concerns with the fuel gauge operation.

    Does the fuel gauge operate correctly without any customer concerns related to fuel gauge indication? 

    Yes  GO to  AO3
    No  GO to Pinpoint Test C 

  4. AO3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST

    • Using a diagnostic scan tool, perform the PCM self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the Master DTC Chart.
    No  GO to  AO4

  5. AO4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (DTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  AO5

  6. AO5 CONFIRM THE CURRENT FUEL LEVEL

    • Scroll to the

      Inst Fuel1  display.

    Does the FLPM (second value) indicate 104 or less with an administrator key or between 104 and 164 with a MyKey® programmed key? 

    Yes  If the low fuel RTT warning indicator is always on, the system is operating correctly at this time based on the current fuel level. If the low fuel RTT warning indicator is never on, GO to  AO6
    No  If the low fuel warning indicator is always on, GO to  AO6 If the low fuel warning indicator is never on, the system is operating correctly at this time based on the current fuel level.

  7. AO6 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the IPC connector.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the IPC connector. Make sure it seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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