Abs Wheel Speed Sensor

Check the tip of the ABS wheel speed sensor for foreign particles or damage. If necessary, clean the tip or replace the ABS wheel speed sensor.
Check the ABS wheel speed sensor cable for discontinuity. If defective, replace the ABS wheel speed sensor.
Connect a 12 V power supply to No. 2 terminal of sensor connector as shown in the illustration, then attach resistance to the No. 1 terminal. Rotate the wheel at about 2.75 km/h (2 MPH), and measure the voltage using an oscilloscope.
Standard value of output voltage:

0.7 - 1.4 V

Fig 1: Connecting 12 V Power Supply To No. 2 Terminal Of Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.
Replace the ABS wheel speed sensor if the inspection result is not within the standard value.