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Pinpoint Test F : 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 5 seconds or longer, the IPC defaults the tachometer to 0 rpm.

    Possible Sources 

    • PCM
    • GWM concern
    • IPC

  2. F1 PERFORM 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  F2

  3. F2 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  F3

  4. F3 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Communications Network .
    No  GO to  F4

  5. F4 CARRY OUT THE TACHOMETER ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL

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

    • Select the IPC tachometer (TACH_IND) PID.

    • Command the tachometer to sweep on and off while monitoring the tachometer.

    Does the tachometer increase from 0 rpm to 6, 000 rpm when commanded on then return to 0 rpm when commanded off? 

    Yes  GO to  F5
    No  Refer to IPC Guided Routine .

  6. F5 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the PCM 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 PCM 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, Refer to PCM Guided Routine .
    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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