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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 An: The Cruise Control RTT (RECONFIGURABLE Telltale) Is Never On

Pinpoint Test An: The Cruise Control RTT (RECONFIGURABLE Telltale) Is Never On

  1. Normal Operation and Fault Conditions 

    See Cruise Control RTT. REFER to: Message Center - System Operation and Component Description .

    If the cruise control status, cruise control override (adaptive cruise) or cruise control set speed display (adaptive cruise) message is missing or deemed invalid by the IPC for less than 5 seconds, the IPC defaults the cruise control indicator to the last indication state (on or off), based upon the last message received.

    If the cruise control status, cruise control override (adaptive cruise) or cruise control set speed display (adaptive cruise) message is missing or if the data is deemed invalid by the IPC for 5 seconds or longer, the IPC defaults the cruise control indicator off.

    Possible Sources 

    • Communication concern
    • Cruise control concern
    • GWM concern
    • IPC

  2. AN1 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  AN3
    No  GO to Pinpoint Test AO 

  3. AN2 CHECK THE CRUISE CONTROL OPERATION

    • Verify the cruise control operates.

    Does the cruise control operate correctly? 

    Yes  GO to  AN3
    No  DIAGNOSE the cruise control. Without ACC, REFER to: Cruise Control . With ACC, REFER to: Cruise Control

  4. AN3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to DTC Chart: Instrument Panel Cluster (IPC) .
    No  GO to  AN4

  5. AN4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network
    No  Refer to PCM Guided Routine .
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