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Front Wheel Speed Sensor: Inspection

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the bulkhead harness connector from TCM. < Ref. to REMOVAL , Transmission Control Module (TCM). >
  2. Set the ST between the TCM and bulkhead harness.

    ST 18460AA040 CHECK BOARD

  3. Set the probe of oscilloscope to the check board connector.

    Terminals: 

    No. 12 (+) - No. 26 (-) 

    Fig 1: Identifying Bulkhead Harness Connector Terminals
    G10313623Courtesy of SUBARU OF AMERICA, INC.
  4. Lift up the vehicle and raise the vehicle speed up to 20 km/h (12 MPH).
  5. Check the waveform of front wheel speed sensor when vehicle speed is at 20 km/h (12 MPH).
    NOTE: The waveform cycle changes as the speed changes.
    Fig 2: Front Wheel Speed Sensor Signal Waveform
    G09482012Courtesy of SUBARU OF AMERICA, INC.
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