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Pinpoint Test F: Turbine Shaft Speed Sensor

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Turbine Shaft Speed (TSS) Sensor Harness Connector illustration in Transmission Connector Layouts .
  1. F1 ELECTRONIC DIAGNOSIS 
    • Vehicle in PARK.
    • Key in OFF position.
    • Check to make sure the transmission harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Access the transmission PIDs.
    • Is the scan tool able to access the transmission PIDs? 
    1. YES  : Go to  F2.
    2. NO  : REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to the Introduction - Gasoline Engines article for diagnosis of PCM.
  2. F2 DRIVE CYCLE TEST 
    • While monitoring the TSS PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
    • Does the TSS PID increase and decrease with engine and vehicle speed? 
    1. YES  : REFER to Diagnosis By Symptom  for concern diagnosis.
    2. NO  : If the TSS PID does not increase and decrease with engine and vehicle speed, INSPECT for open or short in vehicle harness, sensor or a PCM concern or internal hardware concern. Go to  F3.

      If the sensor signal is erratic, INSPECT for intermittent concern in the internal/external harness, sensor or connector.

      If the sensor signal is consistent/unchanging output, go to  F3 .

  3. F3 CHECK THE PCM HARNESS FOR OPENS 
    • Disconnect: PCM C175T
    • Disconnect: Turbine Shaft Speed (TSS) Sensor C143
      • Fig 1: Measuring Resistance
      GF0003467Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM C175T-15, circuit 970 (DG/WH), harness side and TSS C143-1, circuit 970 (DG/WH), harness side.
      • Fig 2: Measuring Resistance
      GF0012350Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM C175T-41, circuit 359 (GY/RD), harness side and TSS C143-2 , circuit 359 (GY/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. F4 CHECK THE PCM HARNESS FOR SHORT TO GROUND 
      Fig 3: Measuring Resistance
      GF0003469Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM C175T-15, circuit 970 (DG/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. F5 CHECK RESISTANCE OF THE TSS SENSOR 
      Fig 4: Measuring Resistance
      GF0003470Courtesy of FORD MOTOR CO.
    • Measure the resistance between the TSS sensor pins, component side.
    • Record the resistance.
    • Is the resistance within 480-590 ohms? 
    1. YES  : REFER to Diagnosis By Symptom  for concern diagnosis.
    2. NO  : INSTALL a new TSS sensor.
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