Impreza Wagon FWD F4-1820cc 1.8L SOHC (1995)
Wheel Speed Sensor: Service and Repair
Inspection
A.B.S. SENSOR
1) Check pole piece of ABS. sensor for foreign particles or damage. If necessary, clean pole piece or replace A.B.S. sensor.
2) Measure resistance between A.B.S. ECM terminals.
CAUTION: If resistance is outside the standard value, replace wheel A.B.S. sensor with new one or adjust sensor gap between A.B.S. sensor
and tone wheel.
NOTE: Check A.B.S. sensor cable for discontinuity. If necessary, replace with a new one.
TONE WHEEL
1) Check tone wheel's teeth (44 pieces) for cracks or dents. If necessary, replace tone wheel with a new one.
2) Clearances (sensor gaps) should be measured one by one to ensure tone wheel and speed sensor are installed correctly.
A.B.S. sensor clearance:
Front
0.9 - 1.4 mm (0.035 - 0.055 in)
Rear
0.7 - 1.2 mm (0.028 - 0.047 in)