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Pinpoint Test F: The Tachometer Is Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CARRY OUT THE INSTRUMENT CLUSTER GAUGES 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 gauges active command. Trigger, monitor, and sweep the gauges. Observe the tachometer gauge.
    • Does the tachometer gauge sweep correctly? 
    1. Yes  : GO to F2.
    2. No  : GO to  F4.
  2. F2 CHECK CLEAN TACH OUT (CTO) SIGNAL TO TACHOMETER 
    • Key in START position.
    • Disconnect: Instrument Cluster C220a.
    • Key in START position.
    • Measure the voltage between the instrument cluster C220a pin 6, circuit 11 (TN/YE), harness side and ground.
      Fig 1: Checking Clean Tach Out Signal To Tachometer
      G03277039Courtesy of FORD MOTOR CO.
    • Is the voltage between 5 and 8 volts? 
    1. Yes  : GO to  F5.
    2. No  : GO to F3.
  3. F3 CHECK CIRCUIT 11 (TN/YE) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Powertrain Control Module (PCM) C175.
    • Measure the resistance between the instrument cluster C220a pin 6, circuit 11 (TN/YE), harness side and the PCM C175 pin 48, circuit 11 (TN/YE), harness side; and between the instrument cluster C220a pin 6, circuit 11 (TN/YE), harness side and ground.
      Fig 2: Checking Circuit 11 (TN/YE) For Open Or Short To Ground
      G03277040Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument cluster and the PCM; and greater than 10,000 ohms between the instrument cluster and ground? 
    1. Yes  : GO to  F6.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  4. F4 CHECK CIRCUIT 11 (TN/YE) FOR A SHORT TO POWER 
    • Measure the voltage between the instrument cluster C220a pin 6, circuit 11 (TN/YE), harness side and ground.
      Fig 3: Checking Circuit 11 (TN/YE) For Short To Power
      G03277041Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : GO to  F6.
  5. F5 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all instrument cluster connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect all 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 . CLEAR the DTCs. REPEAT the instrument cluster self-test. TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  6. F6 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect the PCM connector.
    • Check for:
    • Corrosion
      • Pushed-out pins
    • Connect the PCM connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the DTCs. REPEAT the PCM self-test.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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