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Pinpoint Test E: Output Shaft Speed (OSS) Sensors

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. 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 Transmission Connector Layouts  in this article.
  1. E1 ELECTRONIC DIAGNOSTICS 
    • 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.
    • Enter the following diagnostic mode on the diagnostic tool: Diagnostic Data Link
    • Enter the following diagnostic mode on the diagnostic tool: PCM
    • Select PID/Data Monitor and Record.
    • Select the PID OSS.
    • Does vehicle enter PID/Data Monitor and Record? 
    1. YES  : Go to  E2.
    2. NO  : REPEAT procedure to ENTER PID. If vehicle did not enter PID, REFER to the INTRODUCTION - GASOLINE ENGINES article for diagnosis of PCM.
  2. E2 DRIVE CYCLE TEST 
    • While monitoring the output shaft speed (OSS) PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
    • Does the OSS Speed 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  in this article.
    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
    • Disconnect: OSS Sensor
    • Measure the resistance between PCM pin 14 and OSS connector pin 2 harness side.
      • Fig 1: Measuring Resistance Between PCM Pin 14 And OSS Connector Pin 2 Harness Side
      GF0003463Courtesy of FORD MOTOR CO.
    • Measure the resistance between PCM pin 43 and OSS connector pin 1 harness side.
      • Fig 2: Measuring Resistance Between PCM Pin 43 And OSS Connector Pin 1 Harness Side
      GF0003464Courtesy of FORD MOTOR CO.
    • 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 
    • Disconnect: PCM
    • Disconnect: OSS Sensor
    • Measure the resistance between PCM pin 14 and chassis ground.
      • Fig 3: Measuring Resistance Between PCM Pin 14 And Chassis Ground
      GF0003465Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. E5 CHECK RESISTANCE OF OSS SENSOR 
    • Disconnect the vehicle harness connector from the OSS sensor.
    • Measure the resistance between the OSS sensor pins.
      • Fig 4: Measuring Resistance Between OSS Sensor Pins
      GF0003466Courtesy of FORD MOTOR CO.
    • Record the resistance.
    • Is the resistance within 400-500 ohms at 25°C (77°F)? 
    1. YES  : REFER to Diagnosis By Symptom  in this article for concern diagnosis.
    2. NO  : INSTALL a new OSS sensor.
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