Turbine Speed Sensor: Inspection

WARNING: This page is about a different variant/trim than selected.

Set the ST between the TCM and bulkhead harness. Ref. to TRANSMISSION (DIAGNOSTICS)>General Description>CAUTION .
ST 18460AA040 CHECK BOARD
Set the probe of oscilloscope to the check board connector.
Terminals

No. 12 (+) - No. 42 (-):

Fig 1: Identifying Turbine Speed Sensor Connector Terminals
Courtesy of SUBARU OF AMERICA, INC.
Start and warm up the engine.
Check the waveform and output voltage of the turbine speed sensor with engine idling.
NOTE: The waveform cycle changes as the speed changes.

Fig 2: Turbine Speed Sensor Output Voltage Waveform
Courtesy of SUBARU OF AMERICA, INC.