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Pinpoint Test C: The Transmission Control (TC) Switch Is Inoperative

WARNING: This page is about a different variant/trim than selected.
  1. C1 CHECK THE VOLTAGE TO THE TRANSMISSION CONTROL (TC) SWITCH 
    • Key in OFF position.
    • Disconnect: Selector Lever C307
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Selector Lever C307-5, Circuit 1862 (VT/WH), Harness Side & Ground
      GF0000988Courtesy of FORD MOTOR CO.
    • Measure the voltage between selector lever C307-5, circuit 1862 (VT/WH), harness side, and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. C2 CHECK THE TC SWITCH 
      Fig 2: Measuring Resistance Between Selector Lever C307-5 & C307-6, Component Side
      GF0000989Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever C307-5 and C307-6, component side, while depressing and releasing the TC switch.
    • Is the resistance less than 5 ohms with the TC switch depressed and greater than 10,000 ohms with the TC switch released? 
    1. YES  : Go to  C3.
    2. NO  : INSTALL a new selector lever knob. TEST the system for normal operation.
  3. C3 CHECK CIRCUIT 224 (TN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: PCM C175B
      • Fig 3: Checking Circuit 224 (TN/WH) For An Open
      GF0046431Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever C307-6, circuit 224 (TN/WH), harness side and PCM C175B-29, circuit 224 (TN/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK CIRCUIT 224 (TN/WH) FOR A SHORT TO GROUND 
      Fig 4: Checking Circuit 224 (TN/WH) For A Short To Ground
      GF0046432Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever C307-6, circuit 224 (TN/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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