2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Primary Speed Sensor: Inspection

WARNING: This page is about a different variant/trim than selected.
  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. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
    2. Disconnect the connector from TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)>REMOVAL .
    3. Set the ST between TCM and connector. Ref. to TRANSMISSION (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

      Preparation tool: 

      ST: CHECK BOARD (18460AA040)

    4. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
    5. Connect the probe of oscilloscope to ST.
      G13951062Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. Probe
      14 +
      42 -
    6. Start the engine and warm up completely.
    7. Check the output waveform and output voltage with engine idling.
      NOTE: For the output waveform and output voltage, refer to "TRANSMISSION (DIAGNOSTICS)". Ref. to TRANSMISSION (DIAGNOSTICS)>TRANSMISSION CONTROL MODULE (TCM) I/O SIGNAL>WAVEFORM>SENSOR .
  3. After inspection, install the related parts in the reverse order of removal.
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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.