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Pinpoint Test C: Transmission Control Switch (TCS) Does Not Operate Correctly

  1. C1 TEST THE INSTRUMENT CLUSTER 
    • Connect the diagnostic tool.
    • Using the scan tool, monitor the transmission control switch (TCS) PID, TCS, while cycling the TCS.
    • Does the TC PID cycle from yes to no? 
    1. YES  : REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
    2. NO  : Go to  C2.
  2. C2 CHECK SMART JUNCTION BOX (SJB) FUSE 30 (5A) 
    • Key in OFF position.
    • Check fuse: Smart Junction Box (SJB) 30 (5A)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : Go to  C4.
  3. C3 TEST THE TC SWITCH POWER CIRCUIT FOR AN OPEN 
    • Disconnect: Selector Lever Harness C2096
    • Disconnect: SJB Fuse 30 (5A)
    • Measure the resistance between selector lever harness C2096-6, circuit CBP30 (YE/BU) and the output side of SJB fuse 30 (5A).
      • Fig 1: Measuring Resistance Between Selector Lever Harness Connector C3245-6, Circuit CBP30 (YE/BU)
      GF0031987Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C5.
    2. NO  : REPAIR circuit CBP30 (YE/BU). RECONNECT all components. TEST the system for normal operation.
  4. C4 TEST THE TC SWITCH POWER CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: Selector Lever Harness C2096
    • Disconnect: SJB Fuse 30 (5A)
    • Measure the resistance between selector lever harness C2096-6, circuit CBP30 (YE/BU) and ground.
      • Fig 2: Measuring Resistance
      GF0029871Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C6.
    2. NO  : REPAIR circuit CBP30 (YE/BU). RECONNECT all components. TEST the system for normal operation.
  5. C5 TEST THE TC SWITCH SIGNAL CIRCUIT FOR AN OPEN 
    • Disconnect: PCM C175B
    • Measure the resistance between selector lever harness C2096-5, circuit CET34 (BN/GN) and PCM C175B pin 27, circuit CET34 (BN/GN).
      Fig 3: Measuring Resistance
      GF0042390Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C7.
    2. NO  : REPAIR circuit CET34 (BN/GN). RECONNECT all components. TEST the system for normal operation.
  6. C6 TEST THE TCS SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between selector lever harness C2096-5, circuit CET 34 (BN/GN) and ground.
      • Fig 4: Measuring Resistance
      GF0029868Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C7.
    2. NO  : REPAIR circuit CET34 (BN/GN). TEST the system for normal operation.
  7. C7 TEST THE TC SWITCH  
    • Measure the resistance between selector lever C2096-5 and C2096-6, component side, while cycling the TCS.
      • Fig 5: Measuring Resistance
      GF0029872Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms when pressed and greater than 10,000 ohms when released? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) article. TEST the system for normal operation.
    2. NO  : INSPECT the selector lever wiring harness for damage and repair as necessary. If the selector lever wiring harness is not damaged, INSTALL a new selector lever. REFER to Selector Lever . TEST the system for normal operation.
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