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Pinpoint Test D: The Speedometer Is Inoperative

  1. Normal Operation and Fault Conditions 

    See Speedometer. Refer to Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the vehicle speed message is missing or invalid for 5 seconds or longer, the IPC defaults the speedometer to 0 km/h (0 mph).

    Possible Sources 

    • Communication concern
    • GWM
    • PCM
    • IPC

  2. D1 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) from the IPC self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  Refer to Diagnostic Trouble Code (DTC) Chart 
    No  GO to  D2

  3. D2 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 Communications Network .
    No  GO to  D3

  4. D3 PERFORM THE SPEEDOMETER ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL

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

    • Access the IPC and control the SPDOMETER (%) PID

    • Command the speedometer on and off while monitoring the speedometer.

    Does the speed begin at 0 km/h (0 mph) move to 257 km/h (160 mph) and return to 0 km/h (0 mph)? 

    Yes  DIAGNOSE all PCM Diagnostic Trouble Codes (DTCs). Refer to the appropriate DTC Index.
    No  INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC)  .
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