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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSCVT TRANSAXLE (TR580)TURBINE SPEED SENSORINSPECTION
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

Turbine Speed Sensor: Inspection

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Inspection
  1. Disconnect the ground terminal from battery sensor. Ref. 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.
    G13936602Courtesy of SUBARU OF AMERICA, INC.
  8. Set the ST between the TCM and transmission harness. Ref. 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. Ref. to INTAKE (INDUCTION) (H4DO (EXCEPT FOR HEV))>AIR INTAKE BOOT>INSTALLATION .
  11. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
  12. Set the probe of oscilloscope to the check board connector.

    Connector & terminal  (B54) No. 12 (+) - No. 26 (-):

    G13936603Courtesy of SUBARU OF AMERICA, INC.
  13. Start and warm up the engine.
  14. Check the waveform and output voltage of the turbine speed sensor with engine idling.
    NOTE:

    The waveform cycle changes as the speed changes. 

    G09481451Courtesy of SUBARU OF AMERICA, INC.
RENDER: 1.0x

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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.