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Pinpoint Test D: TCS Switch Does Not Operate Correctly

  1. D1 CHECK THE IC 
    • Connect the scan tool.
    • Using the scan tool, monitor the TCS PID while cycling the Transmission Control Switch (TCS)  .
    • Does the TCS PID cycle from depressed to not depressed? 
  2. D2 CHECK BCM FUSE 42 (5A) 
    • Ignition OFF.
    • Check fuse: Body Control Module (BCM) 42 (5A).
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  D3.
    • No  : GO to  D4.
  3. D3 CHECK THE TCS POWER CIRCUIT FOR AN OPEN 
    • Disconnect: Floor Shifter Harness C3245.
    • Disconnect: BCM Fuse 42 (5A).
    • Measure the resistance between floor shifter harness C3245-6, circuit CBP42 (GN) and the output side of BCM fuse 42 (5A).
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  D4.
    • No:  REPAIR circuit CBP42 (GN) for an open. CLEAR the DTCs. TEST the system for normal operation.
  4. D4 CHECK THE TCS POWER CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: C3245.
    • Disconnect: BCM Fuse 42 (5A).
    • Measure the resistance between floor shifter harness C3245-6, circuit CBP42 (GN) and ground.
      Fig 1: Checking TCS Power Circuit For Short To Ground
      G07402101Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  D5.
    • No:  REPAIR circuit CBP42 (GN) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
  5. D5 CHECK THE TCS SIGNAL CIRCUIT FOR AN OPEN 
    • Disconnect: PCM C175T.
    • Measure the resistance between floor shifter harness C3245-5, circuit CET34 (BN/GN) and PCM C175T-31.
      Fig 2: Checking TCS Signal Circuit For Open
      G07402102Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  D6.
    • No:  REPAIR circuit CET34 (BN/GN) for an open. CLEAR the DTCs. TEST the system for normal operation.
  6. D6 CHECK THE TCS SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between floor shifter harness C3245-5, circuit CET34 (BN/GN) and ground.
      Fig 3: Checking TCS Signal Circuit For Short To Ground
      G07402103Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  D7.
    • No:  REPAIR circuit CET34 (BN/GN) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
  7. D7 CHECK THE TCS 
    • Measure the resistance between floor shifter harness C3245-5 and C3245-6 component side, while cycling the TCS  .
      Fig 4: Checking TCS
      G07402104Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms when pressed and greater than 10,000 ohms when released? 
    • Yes:  REPLACE the PCM. PROGRAM the PCM with the latest calibration level. PERFORM the solenoid body strategy data download procedure, REFER to Solenoid Body Strategy in AUTOMATIC TRANSAXLE/TRANSMISSION - 6F50/6F55 . TEST the system for normal operation.
    • No:  INSPECT the floor shifter wiring harness for damage and repair as necessary. If the floor shifter wiring harness is not damaged, INSTALL a new selector lever knob. REFER to SELECTOR LEVER KNOB  in this service information. CLEAR the DTCs. TEST the system for normal operation.
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