Primary Speed Sensor: Inspection

Remove the bulkhead harness connector from TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>Transmission Control Module (TCM)>REMOVAL .
Set the ST between the TCM and bulkhead harness.
ST 18460AA040 CHECK BOARD
Set the probe of oscilloscope to the check board connector.
Terminals:

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

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

Courtesy of SUBARU OF AMERICA, INC.