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

  1. C1 CHECK FUSE F1.27 
    • Check fuse: Central Junction Box (CJB) Fuse F1.27 (5A).
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  C3.
    • No  : INSTALL a new fuse. TEST the system for normal operation. If the fuse fails again, GO to C2.
  2. C2 CHECK CIRCUIT 1003 (GY/YE) FOR A SHORT TO GROUND 
    • Disconnect: Central Junction Box (CJB) Fuse F1.27 (5A).
    • Measure the resistance between output side of fuse F1.27 (5A) and ground.
      Fig 1: Measuring Resistance Between Output Side Of Fuse F1.27 (5A) And Ground
      G03930265Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to  C4.
    • No  : REPAIR circuit 1003 (GY/YE) for a short to ground.
  3. C3 CHECK CIRCUIT 1003 (GY/YE) FOR AN OPEN 
    • Disconnect: Central Junction Box Fuse F1.27 (5A).
    • Disconnect: Selector Lever C2135.
    • Measure the resistance between selector lever C2135-B and output side of CJB fuse F1.27.
      Fig 2: Measuring Resistance Between Selector Lever C2135-B And Output Side Of CJB Fuse F1.27
      G03930266Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  C6.
    • No  : REPAIR circuit 1003 (GY/YE). RECONNECT all components. TEST the system for normal operation.
  4. C4 CHECK TRANSMISSION CONTROL (TC) SWITCH FOR A SHORT TO GROUND 
    • Disconnect: Selector Lever C2135.
    • Measure the resistance between selector lever C2135-A and ground while cycling the TC switch.
      Fig 3: Measuring Resistance Between Selector Lever C2135-A And Ground
      G03930267Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to C5.
    • No  : INSTALL a new transmission selector lever. RECONNECT all components. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 224 (TN/WH) FOR A SHORT TO GROUND 
    • Disconnect: Powertrain Control Module C175b.
    • Inspect for damaged or pushed-out pins, corrosion or loose wires. Repair as necessary.
    • Measure the resistance between circuit 224 (TN/WH), powertrain control module C175b-45 and ground.
      Fig 4: Measuring Resistance Between Circuit 224 (TN/WH), Powertrain Control Module C175B-45 And Ground
      G03930268Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : INSTALL a new PCM. RECONNECT all components. TEST the system for normal operation.
    • No  : REPAIR circuit 224 (TN/WH). RECONNECT all components. TEST the system for normal operation.
  6. C6 TEST CIRCUIT 224 (TN/WH) FOR OPEN 
    • Disconnect: Powertrain Control Module C175b..
    • Measure the resistance between selector lever C2135-A and PCM C175b-45.
      Fig 5: Measuring Resistance Between Selector Lever C2135-A And PCM C175b-45
      G03930269Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to C7.
    • No  : REPAIR circuit 224 (TN/WH). RECONNECT all components. TEST the system for normal operation.
  7. C7 TEST THE TC SWITCH FOR NORMAL OPERATION 
    • Measure the resistance between selector lever C2135-A and C2135-B while cycling the TC switch.
      Fig 6: Measuring Resistance Between Selector Lever C2135-A And C2135-B
      G03930270Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms while pressed and greater than 10 k ohms when released? 
    • Yes  : INSTALL a new PCM. RECONNECT all components. TEST the system for normal operation.
    • No  : INSTALL a new transmission selector lever. RECONNECT all components. TEST the system for normal operation.
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