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Home >> Ford >> 2021 >> Mustang Mach 1, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrumentation, Message Center And Warning Chimes (2 Of 2) >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test At: The Low Fuel RTT (RECONFIGURABLE Telltale) Is Never Or Always On

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

  1. Normal Operation and Fault Conditions 

    See Low Fuel RTT. REFER to: Message Center - System Operation and Component Description .

    Possible Sources 

    • Fuel gauge concern
    • IPC

    Visual Inspection and Pre-checks 

    • If the low fuel indicator is never on, verify the DTE is less than 50 km (30 miles) DTE (without MyKey® key) or 80 km (50 miles) DTE (with MyKey® key) before beginning diagnostics.
    • If the low fuel indicator is always on, verify the DTE is greater than 50 km (30 miles) DTE (without MyKey® key) or 80 km (50 miles) DTE (with MyKey® key) before beginning diagnostics.

  2. AT1 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors, the hood and luggage compartment lid.

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

    • Monitor the door ajar RTT.

    • Open the driver door.

    • Clear the message center popup warning.

    • Monitor the door ajar RTT.

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

    Yes  GO to  AT2
    No  GO to Pinpoint Test AO 

  3. AT2 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  AT3
    No  GO to Pinpoint Test D 

  4. AT3 CONFIRM THE CURRENT DTE (DISTANCE TO EMPTY)

    • Verify the DTE range.

    Is the DTE range at 120 km (75 miles) (with MyKey® key), 80 km (50 miles), 40 km (25 miles), 20 km (10 miles) or 0 km (0 miles)? 

    Yes  If the low fuel warning indicator is always on, the system is operating correctly at this time based on the current DTE range. If the low fuel warning indicator is never on, INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC) .
    No  If the low fuel warning indicator is always on, INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC) .
    If the low fuel warning indicator is never on, the system is operating correctly at this time based on the current DTE range.
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