Front Wheel Speed Sensor: Inspection

Check the output waveform and output voltage of the front wheel speed sensor.

Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
Disconnect the connector from TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>Transmission Control Module (TCM)>REMOVAL .
Set the ST between TCM and connector. Ref. to TRANSMISSION (DIAGNOSTICS)>General Description>CAUTION .
Special tool:

CHECK BOARD (18460AA040)
Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .

Connect the probe of oscilloscope to ST.

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Probe
12	+
26	-

Start the engine and warm up completely.
Lift up the vehicle.
CAUTION:
- Lift up the vehicle until the tire bottom is 0.3 m (0.98 ft) or more above the ground.
- Make sure that safety is secured where the tiers rotate.
Turn OFF the pre-collision brake function.
Turn the VDC function OFF.
Release the parking brake.
Shift the select lever to "D range".
Release the foot brake pedal, and then depress the accelerator pedal until the vehicle speed increases to 20 km/h (12 MPH).
Check the output waveforms and output voltage.
NOTE: For the output waveform and output voltage, refer to "TRANSMISSION (DIAGNOSTICS)". Ref. to TRANSMISSION (DIAGNOSTICS)>Transmission Control Module (TCM) I/O Signal>SENSOR .