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Pinpoint Test E: Output Shaft Speed (OSS) Sensors

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 Output Shaft Speed (OSS) Sensor Harness Connector illustration in Transmission Connector Layouts .
  1. E1 ELECTRONIC DIAGNOSTICS 
    • 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  E2.
    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. E2 DRIVE CYCLE TEST 
    • While monitoring the OSS_SRC PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
    • Does the OSS_SRC PID increase and decrease with vehicle speed? 
    1. YES  : CLEAR all DTCs. ROAD TEST to verify if concern is still present. If concern is still present, REFER to Diagnosis By Symptom .
    2. NO  : If the OSS PID does not increase and decrease with vehicle speed, INSPECT for open or short in vehicle harness, sensor, a PCM concern or internal hardware concern. Go to  E3.

      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  E3 .

  3. E3 CHECK THE PCM HARNESS FOR OPENS 
    • Disconnect: PCM C175T
    • Disconnect: Output Shaft Speed (OSS) Sensor C1107
      • Fig 1: Measuring Resistance
      GF0012347Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM C175T-3, circuit 136 (DB/YE), harness side and OSS C1107-2, circuit 136 (DB/YE), harness side.
      • Fig 2: Measuring Resistance
      GF0012348Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM C175T-41, circuit 359 (GY/RD), harness side and OSS C1107-1, circuit 359 (GY/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. E4 CHECK THE PCM HARNESS FOR SHORT TO GROUND 
      Fig 3: Measuring Resistance
      GF0012349Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM C175T-3, circuit 136 (DB/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR circuit 136 (DB/YE). TEST the system for normal operation.
  5. E5 CHECK RESISTANCE OF THE OSS SENSOR 
    • Disconnect the vehicle harness connector from the OSS sensor.
    • Remove the OSS sensor from the transmission.
      • Fig 4: Measuring Resistance
      GF0003466Courtesy of FORD MOTOR CO.
    • Measure the resistance between the OSS sensor pins, component side.
    • Is the resistance between 400-500 ohms at 25°C (77°F)? 
    1. YES  : REFER to Diagnosis By Symptom  for concern diagnosis.
    2. NO  : INSTALL a new OSS sensor.
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