2020 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Primary Speed Sensor: Inspection

  1. Check for oil leaks.
  2. Check the output waveform and output voltage of the primary speed sensor.
    1. Disconnect the ground terminal from battery sensor. Refer to REPAIR CONTENTS>NOTE>BATTERY .
    2. Remove the clip from the air intake boot, and loosen the clamp.
      G13223823Courtesy of SUBARU OF AMERICA, INC.
    3. Remove the air intake boot, and place it aside so that it does not interfere with the work.
      CAUTION: Be careful not to pull out the PCV hose.
      G13223824Courtesy of SUBARU OF AMERICA, INC.
    4. Disconnect the ground cord.
      G11255509Courtesy of SUBARU OF AMERICA, INC.
    5. Remove the pitching stopper. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION MOUNTING SYSTEM>REMOVAL>PITCHING STOPPER .
    6. Remove the transmission case cover (front).
      G11255523Courtesy of SUBARU OF AMERICA, INC.
    7. Move the lock lever in the arrow direction while pressing the lock button (A), and disconnect the connector.
      G13592062Courtesy of SUBARU OF AMERICA, INC.
    8. Set the ST between the TCM and transmission harness. Refer to TRANSMISSION (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

      Special tool: 

      CHECK BOARD (18460AA040)

    9. Install the air intake boot. Refer to INTAKE (INDUCTION) (H4DO)>AIR INTAKE BOOT>INSTALLATION .
    10. Connect the ground terminal to battery sensor. Refer to REPAIR CONTENTS>NOTE>BATTERY .
    11. Connect the probe of oscilloscope to ST.
      G13225684Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. Probe
      14 +
      42 -
    12. Start the engine and warm up completely.
    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.
      • Make sure that safety is secured where the tiers rotate.
    14. Turn OFF the pre-collision brake function. (Models with EyeSight)
    15. Turn the VDC function OFF.
    16. Release the parking brake.
    17. Shift the select lever to "D range".
    18. Release the brake pedal, and rotate the tires.
    19. Check the output waveforms and output voltage.
      NOTE: For the output waveform and output voltage, refer to: TRANSMISSION (DIAGNOSTICS)>TRANSMISSION CONTROL MODULE (TCM) I/O SIGNAL>WAVEFORM>SENSOR .
    20. After inspection, install the related parts in the reverse order of removal.
      G11255547Courtesy of SUBARU OF AMERICA, INC.

      Tightening torque: 

      7 N.m (0.7 kgf-m, 5.2 ft-lb)

      G11255523Courtesy of SUBARU OF AMERICA, INC.

      Tightening torque: 

      32.3N.m (3.3 kgf-m, 23.8 ft-lb)

      G11255509Courtesy of SUBARU OF AMERICA, INC.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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