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Pinpoint Test F: Turbine Shaft Speed (TSS) Sensor And Output Shaft Speed (OSS) Sensor

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the OSS or TSS sensor connector illustration Transaxle Connector Layouts .
  1. F1 ELECTRONIC DIAGNOSTICS 
    • Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Diagnose Data Link
    • Enter the following diagnostic mode on the diagnostic tool: PCM
    • Select PID/Data Monitor and Record.
    • Select the following PIDs: TSS, OSS.
    • Does the vehicle enter PID/Data Monitor and Record? 
    1. YES  : REMAIN in PID/DATA. Go to  F2 .
    2. NO  : RERUN procedure to enter PID. If vehicle did not enter PID, REFER to the Introduction - Gasoline Engines article.
  2. F2 DRIVE CYCLE TEST 
    • While monitoring the appropriate sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all the gears.
    • Does the TSS or OSS Speed PID increase and decrease with engine and vehicle speed or is the sensor signal erratic (drop to zero or near zero and return to normal operation)? 
    1. YES  : If the TSS or OSS Speed PID increase and decrease with engine and vehicle speed, CLEAR all DTCs. ROAD TEST, to VERIFY if concern is still present. If concern is still present, REFER to Diagnosis By Symptom  .
    2. If the sensor signal is erratic, INSPECT for intermittent concern in the external harness, sensor, PCM or connector.
    3. NO  : If the TSS or OSS Speed PID does not increase and decrease with engine and vehicle speed, the sensor signal is steady. INSPECT for open or short in vehicle harness, sensor, a PCM concern or internal hardware concern. Go to  F3 .
  3. F3 CHECK CONTINUITY OF TSS OR OSS HARNESS CIRCUITS 
    CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press button and pull up on the transaxle vehicle harness connector.
    • Key in OFF position.
    • Disconnect: OSS C193 or TSS C143 Sensor
    • Disconnect: PCM
    • Inspect for damaged or pushed-out pins, corrosion or loose wires.
      • Fig 1: Checking Circuit For Open
      GF0024737Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 15 and TSS (+) signal circuit C143 pin 2, harness side.
      • Fig 2: Checking Circuit For Open
      GF0024738Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175B pin 50 and TSS (-) signal circuit C143 pin 1, harness side.
      • Fig 3: Checking Circuit For Open
      GF0024739Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 4 and OSS (+) signal circuit C193 pin 2, harness side.
      • Fig 4: Checking Circuit For Open
      GF0024738Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175B pin 50 and OSS (-) signal circuit C193 pin 2, harness side.
    • Is each resistance less than 5 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR open circuit(s). RECONNECT all components. CLEAR the DTCs. RERUN On-Board Diagnostics.
  4. F4 CHECK TSS CIRCUITS OR OSS CIRCUITS FOR SHORT TO POWER AND GROUND 
    • Key in OFF position.
    • Disconnect: TSS C143 or OSS C193
      • Fig 5: Checking Circuits For Short Together
      GF0024740Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 15 and the PCM C175B pins 35 and 36.
      • Fig 6: Checking Circuits For Short Together
      GF0024741Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 4 and the PCM C175B pins 35 and 36.
      • Fig 7: Checking Circuits For Short Together
      GF0024742Courtesy of FORD MOTOR CO.
    • For the TSS and OSS (-), measure the resistance between the PCM C175B pin 50 and the PCM C17B pins 35 and 36.
      • Fig 8: Checking Circuits For Short Together
      GF0024743Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 15 and the PCM C175B pins 47, 48, 49 and 50.
      • Fig 9: Checking Circuits For Short Together
      GF0024744Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 4 and the PCM C175B pins 47, 48, 49 and 50.
    • Is each resistance greater than 10,000 ohms? 
    1. YES  : Go to  F5.
    2. NO  : REPAIR short circuit(s). RECONNECT all components. ERASE DTCs and RERUN On-Board Diagnostics.
  5. F5 TSS OR OSS FUNCTIONAL TEST 
    CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press and pull transaxle vehicle harness connector.
    • Connect: PCM
    • Disconnect: TSS C143 or OSS C193
    • Connect: Transmission Tester
    • Connect the transmission tester to the TSS or OSS sensor.
      • Fig 10: Checking Circuit For Voltage
      GF0024745Courtesy of FORD MOTOR CO.
    • Measure the voltage between +TSS or +OSS to -TSS or -OSS. Set VOM to AC.
    • Does voltage increase with an increase in vehicle speed? 
    1. YES  : INSTALL a new PCM.
    2. NO  : Go to  F6.
  6. F6 CHECK RESISTANCE OF TSS OR OSS SENSOR 
    NOTE: Refer to Transmission Tester for terminal locations.
      Fig 11: Checking Sensor Resistance
      GF0024746Courtesy of FORD MOTOR CO.
    • Measure the resistance between +TSS/+OSS jack and -TSS/-OSS jack on the Transmission Tester.
    • Record the resistance.
      Sensor Resistance (Ohms)
      TSS 625-1,150
      OSS 503-1,010
    • Is resistance within specification for the appropriate sensor? 
    1. YES  : Go to  F7.
    2. NO  : INSTALL a new TSS/OSS sensor. REFER to Turbine Shaft Speed (TSS) Sensor  or Output Shaft Speed (OSS) Sensor . TEST the system for normal operation.
  7. F7 CHECK SENSOR FOR SHORT TO GROUND 
      Fig 12: Checking Circuit For Short To Ground
      GF0024746Courtesy of FORD MOTOR CO.
    • Measure the resistance between BAT- jack (engine ground) and OSS/TSS (+), OSS/TSS (-) jack on the Transmission Tester.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : For TSS, go to  F8 .
    2. For OSS, go to  F10 .
    3. NO  : INSTALL a new TSS or OSS sensor. REFER to Turbine Shaft Speed (TSS) Sensor  or Output Shaft Speed (OSS) Sensor . Go to  F5 .
  8. F8 CHECK TSS MAGNETISM 
    • Remove the TSS sensor from transaxle.
    • Place the TSS sensor against a metal surface to which it should stick. The TSS sensor should be magnetized and stick to the metal surface.
    • Does TSS sensor stick? 
    1. YES  : Go to  F9.
    2. NO  : INSTALL a new TSS sensor. REFER to Turbine Shaft Speed (TSS) Sensor . Go to  F5 .
  9. F9 CHECK EXCITER WHEEL 
    NOTE: Make sure a tooth is visible. The exciter wheel will always be visible through the TSS sensor hole.
    • Remove the TSS sensor.
      • Fig 13: Checking Exciter Wheel
      GF0024747Courtesy of FORD MOTOR CO.
    • With a remote starter switch, start and stop engine until a tooth of the exciter wheel is visible through the TSS sensor hole.
    • Are all 4 teeth present? 
    1. YES  : INSTALL a new TSS sensor. REFER to Turbine Shaft Speed (TSS) Sensor . TEST the system for normal operation.
    2. NO  : REPAIR or INSTALL a new exciter wheel as necessary. TEST the system for normal operation.
  10. F10 CHECK OSS MAGNETISM 
    • Remove OSS sensor from transaxle.
    • Place the OSS sensor against a metal surface to which it should stick. The OSS sensor should be magnetized and stick to the metal surface.
    • Does the OSS sensor stick? 
    1. YES  : The concern is not in the OSS sensor system. REFER to Diagnosis By Symptom  shift concerns for further diagnosis.
    2. NO  : INSTALL a new OSS sensor. REFER to Output Shaft Speed (OSS) Sensor .
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