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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1419 (Automatic Transmission External Controls) >> Diagnostic Tests >> External Controls >> Pinpoint Tests >> PINPOINT TEST B: Transmission Control Switch (TCS) DOES NOT OPERATE CORRECTLY (MKZ ONLY)

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

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  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: Measuring Resistance
      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: Measuring Resistance
      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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