Subaru Legacy III (2000-2003 year). Manual - part 693

ABS-12

ABS

FRONT ABS SENSOR

4. Front ABS Sensor

A: REMOVAL

1) Disconnect battery ground cable.
2) Disconnect front ABS sensor connector located
next to front strut mounting house in engine com-
partment.
3) Remove bolts which secure sensor harness to
strut.

4) Remove bolts which secure sensor harness to
body.

5) Remove bolts which secure front ABS sensor to
housing, and remove front ABS sensor.

CAUTION:
• Be careful not to damage pole piece located
at tip of the sensor and teeth faces during re-
moval.
• Do not pull sensor harness during removal.

B: INSTALLATION

1) Temporarily install front ABS sensor on housing.

CAUTION:
Be careful not to strike ABS sensor's pole piece 
and tone wheel's teeth against adjacent metal 
parts during installation.

2) Install front ABS sensor on strut and wheel
apron bracket.

Tightening torque:

33 N·m (3.3 kgf-m, 24 ft-lb)

(1) To front ABS sensor connector

(2) Bracket

ABS00140

( 1 )

( 2 )

ABS00141

ABS00142

(1) To front ABS sensor connector

(2) Bracket

ABS00142

( 1 )

( 2 )

ABS00141

ABS-13

ABS

FRONT ABS SENSOR

3) Place a thickness gauge between ABS sensor's
pole piece and tone wheel's tooth face. After stan-
dard clearance is obtained over the entire perime-
ter, tighten ABS sensor on housing to specified
torque.

ABS sensor standard clearance:

0.3 — 0.8 mm (0.012 — 0.031 in)

Tightening torque:

33 N·m (3.3 kgf-m, 24 ft-lb)

CAUTION:
Check the marks on the harness to make sure 
that no distortion exists.

NOTE:
If the clearance is outside specifications, adjust the
gap using spacer (Part No. 26755AA000).
4) After confirmation of the ABS sensor clearance,
connect connector to ABS sensor.
5) Connect connector to battery ground cable.

C: INSPECTION

1. ABS SENSOR

1) Check pole piece of ABS sensor for foreign par-
ticles or damage. If necessary, clean pole piece or
replace ABS sensor.
2) Measure ABS sensor resistance.

CAUTION:
If resistance is outside the standard value, re-
place ABS sensor with new one.

NOTE:
Check ABS sensor cable for discontinuity. If neces-
sary, replace with a new one.

Model

LH

RH

Except OUTBACK

Yellow

White

OUTBACK

Brown

Light blue

ABS00142

Terminal No.

Standard

1 and 2

1.25

±

0.25 k

Ω

ABS00143

2 1

ABS-14

ABS

FRONT ABS SENSOR

2. SENSOR GAP

1) Measure the distance “A” between ABS sensor
surface and sensor pole face.

2) Measure the distance “B” between surface
where the front axle housing meets the ABS sen-
sor, 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 valves in the formula below and cal-
culating.

ABS sensor clearance = B 

−−−−

 A

ABS sensor standard clearance:

0.3 — 0.8 mm (0.012 — 0.031 in)

NOTE:
If the clearance is outside specifications, adjust the
gap using spacer (Part No. 26755AA000).

3. OUTPUT VOLTAGE

Output voltage can be checked by the following
method. Install resistor and condenser, then rotate
wheel about 2.75 km/h (2 MPH) or equivalent.

NOTE:
Regarding terminal No., please refer to item 1. ABS
SENSOR.

D: ADJUSTMENT

Adjust the gap using spacer (Part No.
26755AA000).

(1) Axle housing

(2) Tone wheel

ABS00161

A

ABS00145

B

( 1 )

( 2 )

(1) Standard output voltage:

Approx. 120 mV (When it is 10 Hz)

(2) To terminal

(3) Oscilloscope

ABS00162

10 Hz

3.9 k

14.7 k

10 nF

+60 mV

0

–60 mV

100 k

( 1 )

( 2 )

( 2 )

( 3 )

ABS-15

ABS

REAR ABS SENSOR

5. Rear ABS Sensor

A: REMOVAL

1) Disconnect battery ground cable.
2) Lift-up the vehicle.
3) Remove fuel tank cover.

4) Disconnect rear ABS sensor connector.

5) Remove rear sensor harness from clip on body
side.

6) Remove bolts which hold rear sensor harness
brackets.

7) Remove rear ABS sensor from rear arm.

ABS00163

ABS00164

ABS00165

ABS00166

ABS00167

ABS00168

ABS00169