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Pinpoint Test C: The Transmission Control Switch Is Not Operating Correctly

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. C1 CHECK I/P FUSE 27 (15A) 
    • Key in OFF position.
    • Check fuse: I/P Fuse 27 (15A).
    • Is the resistance less than 5 ohms? 
    1. Yes  : REINSTALL the fuse. GO to  C3.
    2. No  : INSTALL a new fuse. TEST the system for normal operation. If the fuse fails again, GO to C2.
  2. C2 CHECK CIRCUIT 224 (TN/WH) FOR A SHORT TO GROUND 
    • Disconnect: Powertrain Control Module (PCM).
    • Connect breakout box.
    • Leave the PCM disconnected.
    • Measure the resistance between test pin 29 and test pins 24 and 77 at the 104-Pin Breakout Box.
      Fig 1: Checking Circuit 224 (TN/WH) For A Short To Ground
      G03276067Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : CHECK circuit 298 (PK/OG) and related components for a short to ground. TEST the system for normal operation.
    2. No  : REPAIR circuit 224 (TN/WH). TEST the system for normal operation.
  3. C3 CHECK THE TRANSMISSION CONTROL SWITCH (TCS) CIRCUIT FOR VOLTAGE 
    • Disconnect: Powertrain Control Module (PCM).
    • Connect breakout box.
    • Leave the PCM disconnected.
    • Key in ON position.
    • Measure the voltage between test pin 29 and test pins 24 and 77 at the 104-Pin Breakout Box while cycling the TCS several times.
      Fig 2: Checking Transmission Control Switch (TCS) Circuit For Voltage
      G03276068Courtesy of FORD MOTOR CO.
    • Does the voltage cycle? 
    1. Yes  : INSTALL a new PCM. REMOVE the 104-Pin Breakout Box. TEST the system for normal operation.
    2. No  : GO to C4.
  4. C4 CHECK CIRCUIT 298 (PK/OG) AND CIRCUIT 224 (TN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: I/P Fuse 26 (10A).
    • Disconnect: Transmission Control Switch (TCS).
    • Measure the resistance between the I/P fuse 26 (10A) connector pin 1 and the power side of the TCS vehicle harness connector circuit 298 (PK/OG).
      Fig 3: Checking Circuit 298 (PK/OG) For An Open
      G03276069Courtesy of FORD MOTOR CO.
    • Measure the resistance between test pin 29 at the 104-Pin Breakout Box and signal side of the transmission control switch vehicle harness connector circuit 224 (TN/WH).
      Fig 4: Checking Circuit 224 (TN/WH) For An Open
      G03276070Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms for both circuits? 
    1. Yes  : GO to C5.
    2. No  : REPAIR the open circuit. REMOVE 104-Pin Breakout Box. RECONNECT all components. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 224 (TN/WH) FOR A SHORT TO POWER 
    • Measure the resistance between test pin 29 and test pins 71 and 97 at the 104-Pin Breakout Box.
      Fig 5: Checking Circuit 224 (TN/WH) For A Short To Power
      G03276071Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : INSTALL a new transmission control switch. REMOVE the 104-Pin Breakout Box.

      RECONNECT all components.

    2. No  : REPAIR circuit 224 (TN/WH).

      REMOVE the 104-Pin Breakout Box. RECONNECT all components. TEST the system for normal operation.

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