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Pinpoint Test G: The Tachometer Is Inoperative

  1. Normal Operation and Fault Conditions 

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

    If the IPC does not receive the engine rpm data from the PCM for more than 5 seconds, the IPC defaults the tachometer to 0 rpm.

    Possible Sources 

    • Communication concern
    • PCM
    • GWM
    • IPC

  2. G1 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • 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 Diagnostic Trouble Code (DTC) Chart 
    No  GO to  G2

  3. G2 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  G3

  4. G3 PERFORM THE TACHOMETER ACTIVE COMMAND

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

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

    • NOTE: Make sure to set the scan tool to 0 rpm before beginning this step.

      Command the tachometer in 10% increments while monitoring the tachometer.

    Does the tachometer increase approximately 800 rpm with each 10% increment? 

    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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