Subaru 2009 IMPREZA Service Manual page 2377

ABS
2. ABS WHEEL SPEED SENSOR
1) 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.
2) Connect a 12 V power supply to No. 2 terminal of
sensor connector as shown in the figure, then at-
tach 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
1.4 V
0.7 V
12 V
1 2
2
(2)
1
100
(1) Oscilloscope
(2) ABS wheel speed sensor
NOTE:
Check the ABS wheel speed sensor cable for dis-
continuity. If necessary, replace with a new part.
Front ABS Wheel Speed Sensor
(1)
ABS00388
ABS-14