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Pinpoint Test L: The Tachometer Is Inoperative

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 RETRIEVE THE RECORDED DTCS FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS - POWERTRAIN CONTROL MODULE (PCM) 
    • Use the recorded PCM DTCs from the continuous and on-demand self-test.
    • Are any DTCs recorded? 
    1. Yes  : REPAIR the DTC. REFER to the ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINE article in ENGINE PERFORMANCE .
    2. No  : GO to L2.
  2. L2 CARRY OUT THE INSTRUMENT CLUSTER TACHOMETER ACTIVE COMMAND USING THE DIAGNOSTIC TOOL 
    • Connect 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 TACHOMETER reads 50%. Note the tachometer gauge reading.
    • Adjust the scroll knob until TACHOMETER reads 100%. Note the tachometer gauge reading.
    • Does the tachometer gauge needle start at 0 RPM, move to approximately 3500 RPM at 50% and 7000 RPM at 100%? 
    1. Yes  : GO to  L4.
    2. No  : GO to L3.
  3. L3 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? 
    1. Yes  : INSTALL a new PCM. REFER to INTAKE AIR, FUEL CHARGING, STARTING & ENGINE ELECTRONICS - 3.0L (4V) or INTAKE AIR, FUEL CHARGING, STARTING & ENGINE ELECTRONICS - 3.9L . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.
  4. L4 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? 
    1. Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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