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Pinpoint Test F: Turbine Shaft Speed (TSS) Sensor

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, and 2008 Ford Cutaway. 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 appropriate Engine Performance article for diagnosis of PCM.
  2. F2 DRIVE CYCLE TEST 
    • While monitoring the turbine shaft speed (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: TSS Sensor C143
      • Fig 1: Measuring Resistance Between PCM C175T-15, Circuit 970 (DG/WH)
      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 Between PCM C175T-41, Circuit 359 (GY/RD)
      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: Checking PCM Harness For Short To Ground
      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: Checking Resistance Of TSS Sensor
      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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