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Pinpoint Test I: The Park Switch Not Working

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. I1 CHECK CIRCUIT 15-TA34 (GN/YE) FOR OPEN 
    • Disconnect: Transmission Shift Selector C307.
    • Key in ON position.
    • Measure the voltage between transmission shift selector C307 pin 3, circuit 15-TA34 (GN/YE), harness side and ground.
      Fig 1: Measuring Voltage Between Transmission Shift Selector C307 Pin 3, Circuit 15-TA34 (GN/YE), Harness Side And Ground
      G03201644Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      1. Yes  : GO to I2.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
  2. I2 CHECK FOR VOLTAGE ON CIRCUIT 8-TA34 (WH) 
    • Connect: Transmission Shift Selector C307.
    • Disconnect: Instrument Cluster C220b.
    • Select PARK.
    • Key in ON position.
    • Measure the voltage between instrument cluster C220b pin 8, circuit 8-TA34 (WH), harness side and ground.
      Fig 2: Measuring Voltage Between Instrument Cluster C220B Pin 8, Circuit 8-TA34 (WH), Harness Side And Ground
      G03201645Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      1. Yes  : INSTALL a new instrument cluster. REFER to INFORMATION, GAUGES & WARNING DEVICES . TEST the system for normal operation.
      2. No  : GO to I3.
  3. I3 CHECK CIRCUIT 8 -TA34 (WH) FOR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Transmission Shift Selector C307.
    • Measure the resistance between transmission shift selector C307 pin 8, circuit 8-TA34 (WH), harness side and ground.
      Fig 3: Measuring Resistance Between Transmission Shift Selector C307 Pin 8, Circuit 8-TA34 (WH), Harness Side And Ground
      G03201646Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
      1. Yes  : GO to I4.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
  4. I4 CHECK CIRCUIT 8 -TA34 (WH) FOR OPEN 
    • Measure the resistance between transmission shift selector C307 pin 8, circuit 8-TA34 (WH), harness side and instrument cluster C220b pin 8, circuit 8-TA34 (WH), harness side.
      Fig 4: Checking Circuit 8 -TA34 (WH) For Open
      G03201647Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      1. Yes  : INSTALL a new shifter harness. TEST the system for normal operation.
      2. No  : REPAIR the circuit. TEST the system for normal operation.
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