Secondary Speed Sensor: Inspection

WARNING: This page is about a different car, the 2012 Subaru Outback and 2012 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Remove the instrument panel lower cover. Refer to INSTRUMENT PANEL LOWER COVER EI-63, REMOVAL, Instrument Panel Lower Cover.
Set the probe of oscilloscope to TCM harness connector.
Connector & terminal

(B54) No. 7 (+) - No. 14 (-):

Fig 1: Identifying Instrument Panel Lower Cover
Courtesy of SUBARU OF AMERICA, INC.
Start and warm up the engine.
Check the waveform of secondary speed sensor with engine idling.

Fig 2: Identifying Curve Between Secondary Speed Sensor And Engine Idling
Courtesy of SUBARU OF AMERICA, INC.