Subaru IMPREZA GD 2007 Series Manual page 3124

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C: INSPECTION
1. ABS WHEEL SPEED SENSOR
1) Check the pole piece of the ABS wheel speed
sensor for foreign particles or damage. If neces-
sary, clean the pole piece or replace the ABS wheel
speed sensor.
2) Measure the ABS wheel speed sensor resis-
tance.
If resistance is out of the standard value, replace
with a new ABS wheel speed sensor.
Terminal No.
1 and 2
NOTE:
Check the ABS wheel speed sensor cable for dis-
continuity. If necessary, replace with a new part.
2. SENSOR GAP
1) Check the gap between the tone wheel and the
ABS wheel speed sensor around the entire circum-
ference.
NOTE:
If clearance is narrow, adjust by using the spacer
(Part No. 26755AA000).
If clearance is wide, check the output voltage and
replace the ABS wheel speed sensor or tone wheel
if the output voltage is out of the specification.
ABS wheel speed sensor gap standard value:
0.7 — 1.2 mm (0.028 — 0.047 in)
(1) Tone wheel
(2) ABS wheel speed sensor
(3) Sensor gap
Rear ABS Wheel Speed Sensor
2 1
ABS00143
Standard
1.15±0.115 kΩ
(1)
(2)
(3)
ABS00149
ABS-17
3. OUTPUT VOLTAGE
Output voltage can be checked by the following
method. Install a resistor and condenser, then ro-
tate the wheel about 2.75 km/h (2 MPH) or equiva-
lent.
Standard value of output voltage:
0.12 — 1 V (at 20 Hz)
NOTE:
Regarding terminal numbers, refer to item 1. ABS
WHEEL SPEED SENSOR. <Ref. to ABS-17, ABS
WHEEL SPEED SENSOR, INSPECTION, Rear
ABS Wheel Speed Sensor.>
60 mV
0
60 mV
20 Hz
17.8 K
(2)
(2)
(1) Oscilloscope
(2) Terminals
D: ADJUSTMENT
Adjust the gap using spacer (Part No. 26755AA000).
ABS
(1)
5 % 562 5 %
ABS00146