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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 PCM KOEO self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the appropriate Electronic Engine Controls article .
    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 TESTING
    No  INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC)  .
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