LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2241 (Automatic Transmission - 4R70E/W, 4R75E/W) >> Diagnostic Tests >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test E: Output Shaft Speed (OSS) Sensors

Pinpoint Test E: Output Shaft Speed (OSS) Sensors

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 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 appropriate Engine Performance 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 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: OSS Sensor C1107
      • Fig 1: Measuring Resistance Between PCM C175T-3, Circuit 136 (DB/YE)
      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 Between PCM C175T-41, Circuit 359 (GY/RD)7
      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: Checking PCM Harness For Short To Ground
      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: Checking Resistance Of OSS Sensor
      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.
scientia non olet · About LEMON Manuals