Abs Wheel Speed Sensor

WARNING: This page is about a different car, the 2011 Subaru Tribeca. However, it is still accessible from the selected car via links, so may be relevant.

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.
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: Identifying ABS Wheel Speed Sensor And Oscilloscope
Courtesy of SUBARU OF AMERICA, INC.