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Pinpoint Test G: The Tachometer Is Inoperative

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 RETRIEVE THE RECORDED POWERTRAIN CONTROL MODULE (PCM) DTCS FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Check for recorded PCM DTCs from the continuous and on-demand self-test.
    • Are any DTCs recorded? 
  2. G2 CARRY OUT THE INSTRUMENT CLUSTER TACHOMETER ACTIVE COMMAND USING THE DIAGNOSTIC TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
    • Select the instrument cluster tachometer control active command. Trigger the tachometer active command. Adjust the scroll knob until the tachometer reads 50%. Observe the tachometer gauge reading.
    • Adjust the scroll knob until the tachometer reads 100%. Observe the tachometer gauge reading.
    • Does the tachometer gauge needle start at 0 rpm, move to approximately 3,500 rpm at 50%, and 7,000 rpm at 100%? 
    • Yes  : GO to  G4.
    • No  : GO to  G3.
  3. G3 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. 413-01-27
  4. G4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER  in this article. TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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