Impreza 2.5 RS Sedan AWD F4-2.5L SOHC (2002)
Wheel Speed Sensor: Testing and Inspection
Front
INSPECTION
1. ABS SENSOR
1) Check the pole piece of the ABS sensor for foreign particles or damage. If necessary, clean the pole piece or replace the ABS sensor.
2) Measure the ABS sensor resistance.
Terminal No. 1 and 2
Standard: 1.25 +/-0.25 k ohms
CAUTION: If resistance is outside the standard value, replace the ABS sensor with a new one.
NOTE: Check the ABS sensor cable for discontinuity. If necessary, replace with a new one.
2. SENSOR GAP
1) Measure the distance "A" between ABS sensor surface and sensor pole face.
2) Measure the distance "B" between the surface where front axle housing meets the ABS sensor, and the tone wheel.
NOTE: Measure so that the gauge touches the tone wheel teeth top.
3) Find the gap between the ABS sensor pole face and the surface of the tone wheel teeth by putting the measured values in the formula below
and calculating.
ABS sensor clearance = B - A
ABS sensor standard clearance: 0.3 - 0.8 mm (0.012 - 0.031 inches)
NOTE: If the clearance is outside specifications, readjust.
3. OUTPUT VOLTAGE