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Pinpoint Test AQ: The Mil (Malfunction Indicator Lamp) 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 MIL. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the MIL request message is missing or invalid for less than 5 seconds, the IPC defaults the MIL to its last state (on or off) based upon the last known good message received.

    If the MIL request message is missing for 5 seconds or longer, the IPC defaults the MIL on.

    Possible Sources 

    • Communication concern
    • GWM
    • PCM
    • IPC

  2. AQ1 IDENTIFY THE IPC (INSTRUMENT PANEL CLUSTER) LEVEL

    Is the vehicle equipped with a 4-inch display IPC? 

    Yes  GO to  AQ3
    No  GO to  AQ2

  3. AQ2 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors and 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  AQ4
    No  GO to Pinpoint Test A 

  4. AQ3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND

    • Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).

    • Access the IPC and control the MILPID

    • Command the MIL on and off.

    Does the MIL illuminate when commanded on and turn off when commanded off? 

    Yes  GO to  AQ4
    No  GO to  AQ6

  5. AQ4 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Ignition ON.

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

    • Check for recorded Diagnostic Trouble Codes (DTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the IPCDTC Chart.
    No  GO to  AQ5

  6. AQ5 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  If the MIL is never on, the system is operating correctly at this time. If the MIL is always on, DIAGNOSE all PCM Diagnostic Trouble Codes (DTCs). REFER to the Master DTC Chart.

  7. AQ6 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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