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Primary Speed Sensor: Inspection

WARNING: This page is about a different car, the 2019 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the bulkhead wiring harness connector from TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)>REMOVAL .
  2. Set the ST (CHECK BOARD) between the TCM and bulkhead wiring harness.
  3. Set the probe of oscilloscope to the check board connector.

    Terminals: 

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

    G13200042Courtesy of SUBARU OF AMERICA, INC.
  4. Start and warm up the engine.
  5. Check the waveform of primary speed sensor with the engine idling.
    NOTE: The waveform cycle changes as the speed changes.
    G09482009Courtesy of SUBARU OF AMERICA, INC.
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