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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 Control article .
    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 (CM DTCs).

    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 Testing .

  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 Testing .
    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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