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Home >> Subaru >> 2016 >> Outback 2.5i >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Continuously Variable Transaxle (CVT) (H4DO) >> Primary Speed Sensor >> Inspection
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Primary Speed Sensor: Inspection

  1. Disconnect the ground terminal from battery sensor. < Ref. to BATTERY , NOTE, Repair Contents. >
  2. Remove the clip (A), and loosen the clamps (B) and (C).
    Fig 1: Identifying Air Intake Boot Clip And Clamps
    G10262107Courtesy of SUBARU OF AMERICA, INC.
  3. Remove the air intake boot from the throttle body, and move it to the left side wheel apron.
    Fig 2: Identifying Air Cleaner Case (Rear) And Throttle Body
    G10262108Courtesy of SUBARU OF AMERICA, INC.
  4. Disconnect the transmission radio ground terminal and transmission harness connector, and remove the harness clip.
    Fig 3: Identifying Transmission Radio Ground Terminal And Harness Connector
    G10313006Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the transmission case cover.
    Fig 4: Locating Transmission Case Cover Bolts
    G10274974Courtesy of SUBARU OF AMERICA, INC.
  6. Move the lock lever in the arrow direction while pressing the lock button, and disconnect the connector.
    Fig 5: Moving Lock Lever
    G10313008Courtesy of SUBARU OF AMERICA, INC.
  7. Set the ST between TCM and transmission harness. < Ref. to CAUTION , General Description. >

    ST 18460AA040 CHECK BOARD

  8. Connect the transmission radio ground terminal and transmission harness connector, and install the harness clip.

    Tightening torque: 

    13 N.m (1.3 kgf-m, 9.6 ft-lb) 

  9. Install the air intake boot assembly. < Ref. to INSTALLATION , Air Intake Boot. >
  10. Connect the ground terminal to battery sensor. < Ref. to BATTERY , NOTE, Repair Contents. >
  11. Set the probe of oscilloscope to the check board connector.

    Connector & terminal: 

    (B54) No. 14 (+) - No. 42 (-): 

    Fig 6: Identifying Primary Speed Sensor Connector Terminals
    G10313009Courtesy of SUBARU OF AMERICA, INC.
  12. Start and warm up the engine.
  13. Lift up the vehicle.
    CAUTION: Lift up the vehicle until the tire bottom is 0.3 m (0.98 ft) or more above the ground.
  14. Shift the select lever to "D" range.
  15. Check the waveform and output voltage of the primary speed sensor with engine idling.
    NOTE: The waveform cycle changes as the speed changes.
    Fig 7: Primary Speed Sensor Signal Waveform
    G09481458Courtesy of SUBARU OF AMERICA, INC.
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