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Pinpoint Test C : 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.

    Possible Sources 

    • Communication concern
    • ABS
    • GWM
    • PCM
    • IPC

  2. C1 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Ignition ON.

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to DTC Chart: IPC 
    No  GO to  C2

  3. C2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Anti-Lock Brake System (ABS) and Stability Control .
    No  GO to  C3

  4. C3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the appropriate Electronic Engine Controls information.
    No  GO to  C4

  5. C4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network .
    No  GO to  C5

  6. C5 PERFORM THE SPEEDOMETER ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL

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

    • NOTE: Make sure to set the diagnostic scan tool to 0 or full cold before beginning this step.

      Select the IPC speedometer (SPDOMETER) PID.

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

    Does the speed begin at 0 km/h (0 mph), move to 193 km/h (120 mph) and return to 0 km/h (0 mph)? 

    Yes  Refer to PCM Guided Routine .
    No  Refer to IPC Guided Routine .
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