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Home >> Ford >> 2020 >> Fusion Titanium, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6-Speed Automatic Transmission - 6F35 (2 Of 3) >> Diagnosis And Testing >> Automatic Transmission - 2.0L EcoBoost (184kW/250PS) - MI4 >> Pinpoint Tests >> Pinpoint Test L : OSS (Output Shaft Speed) Sensor

Pinpoint Test L : OSS (Output Shaft Speed) Sensor

  1. Refer to Transmission Controls - 6F35 for schematic and connector information.

    Normal Operation and Fault Conditions 

    The OSS sensor is a Hall-effect sensor that sends a signal to the PCM that indicates transmission output shaft speed. The OSS sensor is used for TCC control and shift scheduling.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0720:00 Output Shaft Speed Sensor Circuit: No Sub Type Information No input from the OSS sensor.
    PCM P0721:00 Output Shaft Speed Sensor Circuit Range/Performance: No Sub Type Information Unrealistic change in the OSS sensor signal, erratic or intermittently no input.
    PCM P0722:00 Output Shaft Speed Sensor Circuit No Signal: No Sub Type Information No input from the OSS sensor.

    Possible Sources 

    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • OSS sensor
    • PCM

  2. L1 RETRIEVE AND RECORD ALL DTCS

    • Using a diagnostic scan tool, retrieve all DTCs.

    Are DTCs P0720, P0721 and/or P0722 present? 

    Yes  GO to  L2
    No  REFER to: Diagnosis By Symptom .

  3. L2 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR VEHICLE POWER CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transmission Vehicle Harness C1520A.

    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1520A-18
      GFD482604Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is voltage greater than 9.5 volts? 

    Yes  GO to  L3
    No  INSPECT and REPAIR the circuit. If an open circuit is not found, Refer to PCM Guided Routine Testing After installing a new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .

  4. L3 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR GROUND CIRCUIT

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1520A-18
      GFD482604Courtesy of FORD MOTOR COMPANY
      		 C1520A-20

    Is voltage greater than 9.5 volts? 

    Yes  GO to  L4
    No  INSPECT and REPAIR the circuit. If an open circuit is not found, Refer to PCM Guided Routine Testing After installing a new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .

  5. L4 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1381E.

    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1520A-19
      GFD482603Courtesy of FORD MOTOR COMPANY
      		 C1381E-12

    Is the resistance less than 3 ohms? 

    Yes  GO to  L5
    No  REPAIR the circuit.

  6. L5 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1520A-19
      GFD482603Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  L6
    No  REPAIR the circuit.

  7. L6 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR A SHORT TO POWER

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1520A-19
      GFD482604Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  INSTALL a new OSS sensor. REFER to: Output Shaft Speed (OSS) Sensor .
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