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Home >> Ford >> 2018 >> Transit Connect XL, Van Cargo >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission, Transfer Case And Power Transfer Unit (2 Of 2) >> Diagnosis And Testing >> Automatic Transmission, Transfer Case and Power Transfer Unit - 2.5L Duratec (125kW/170PS) >> Pinpoint Tests >> Pinpoint Test L : DTCS P0720, P0721, P0722

Pinpoint Test L : DTCS P0720, P0721, P0722

  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 the diagnostic scan tool, retrieve all diagnostic trouble codes (DTCs).

    Are diagnostic trouble codes (DTCs) P0720, P0721, P0722 and/or P0715, present? 

    Yes  For diagnostic trouble codes (DTCs) P0720, P0721 and P0722, GO to  L2 For DTC P0715 and P0720, GO to  L6
    No  REFER to: Diagnosis By Symptom .

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

    • Ignition OFF.

    • Disconnect Transmission Vehicle Harness C168A.

    • Disconnect PCM C175E.

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

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-19
      GFD304648Courtesy of FORD MOTOR COMPANY
      		 C175E-26

    Is the resistance less than 3 ohms? 

    Yes  GO to  L3
    No  REPAIR the circuit.

  4. L3 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-19
      GFD304648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  L4
    No  REPAIR the circuit.

  5. L4 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR SIGNAL CIRCUIT FOR A SHORT TO POWER

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-19
      GFD304649Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  L5

  6. L5 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR GROUND CIRCUIT

    • Ignition OFF.

    • Connect PCM C175E.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-19
      GFD304649Courtesy of FORD MOTOR COMPANY
      		 C168A-20

    Is voltage less than 4.8 volts? 

    Yes  INSPECT and REPAIR the circuit. If an open circuit is not found, Refer to PCM Guided Routine Testing .
    No  INSTALL a new OSS sensor. REFER to: Output Shaft Speed (OSS) Sensor .

  7. L6 CHECK THE OSS (OUTPUT SHAFT SPEED) SENSOR VEHICLE POWER CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transmission Vehicle Harness C168A.

    • 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
      C168A-18
      GFD304649Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is voltage less than 9.5 volts? 

    Yes  INSPECT and REPAIR the circuit. If an open circuit is not found, Refer to PCM Guided Routine Testing .
    No  CLEAR the DTC. If diagnostic trouble codes (DTCs) P0715 and/or P0720 return, Refer to PCM Guided Routine Testing .
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