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Primary Speed Sensor: Inspection

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the ground terminal from 12V engine restart battery sensor. Refer to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
  2. Remove the clip from the air intake boot, and loosen the clamp.
    G11252776Courtesy of SUBARU OF AMERICA, INC.
  3. Remove the air intake boot, and place it aside so that it does not interfere with the work.
    NOTE: Be careful not to pull out the PCV hose.
    G11252777Courtesy of SUBARU OF AMERICA, INC.
  4. Remove the transmission radio ground terminal.
    G11255509Courtesy of SUBARU OF AMERICA, INC.
  5. Disconnect the transmission harness connector.
    G11255510Courtesy of SUBARU OF AMERICA, INC.
  6. Remove the transmission case cover (small).
    G11255523Courtesy of SUBARU OF AMERICA, INC.
  7. Move the lock lever in the arrow direction while pressing the lock button, and disconnect the connector.
    G13603532Courtesy of SUBARU OF AMERICA, INC.
  8. Set the ST between TCM and transmission harness. Refer to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>GENERAL DESCRIPTION>CAUTION .

    Preparation tool: 

    ST: CHECK BOARD (18460AA040)

  9. Connect the transmission radio ground terminal and transmission harness connector.

    Tightening torque: 

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

  10. Install the air intake boot. Refer to INTAKE (INDUCTION) (H4DO (EXCEPT FOR HEV))>AIR INTAKE BOOT>INSTALLATION .
  11. Connect the ground terminal to 12V engine restart battery sensor. Refer to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
  12. Set the probe of oscilloscope to the check board connector.

    Connector & terminal 

    (B54) No. 14 (+) - No. 42 (-):

    G13603533Courtesy of SUBARU OF AMERICA, INC.
  13. Start and warm up the engine.
  14. 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.
  15. Shift the select lever to the "D" range.
  16. Check the waveform and output voltage of the primary speed sensor with engine idling.
    NOTE: The waveform cycle changes as the speed changes.
    G09481458Courtesy of SUBARU OF AMERICA, INC.
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