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PINPOINT TEST B: Transmission Control Switch (TCS) DOES NOT OPERATE CORRECTLY (MKZ ONLY)

WARNING: This page is about a different variant/trim than selected.
  1. B1 TEST THE Instrument Cluster (IC) 
    • Connect the diagnostic tool.
    • Using the scan tool, monitor the TCS PID while cycling the TCS.
    • Does the TCS PID cycle from depressed to not depressed? 
    1. YES  : REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
    2. NO  : Go to  B2.
  2. B2 TEST THE SELECTOR LEVER GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: Selector Lever Harness C3233
      • Fig 1: Testing Selector Lever Ground Circuit For An Open
      GF0029869Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3233-5, circuit GD116 (BK/VT), vehicle harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B3.
    2. NO  : REPAIR the selector lever ground circuit for an open. TEST the system for normal operation.
  3. B3 TEST THE TCS CIRCUIT FOR AN OPEN 
    • Disconnect: Transmission Control Module (TCM) C1533
      • Fig 2: Testing TC Switch Circuit For An Open
      GF0029870Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3233-6, circuit CET34 (BN/GN), vehicle harness side and TCM C1533-7 circuit CET34 (BN/GN), vehicle harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B4.
    2. NO  : REPAIR the circuit for an open. TEST the system for normal operation.
  4. B4 TEST THE TCS CIRCUIT FOR A SHORT TO GROUND 
      Fig 3: Testing TCS Circuit For A Short To Ground
      GF0029871Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3233-6, circuit CET34 (BN/GN), vehicle harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  B5.
    2. NO  : REPAIR the circuit for a short to ground. TEST the system for normal operation.
  5. B5 TEST THE TCS 
      Fig 4: Testing TCS
      GF0029872Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3233-5 and C3233-6, component side, while cycling the TCS.
    • Is the resistance less than 5 ohms when pressed and greater than 10,000 ohms when released? 
    1. YES  : INSTALL a new TCM. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - AISIN AW21 article. TEST the system for normal operation.
    2. NO  : INSTALL a new selector lever knob. REFER to Selector Lever Knob - 3.5L . TEST the system for normal operation.
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