1999 SUBARU LEGACY sensor

1) Disconnect battery negative terminal.
2) Disconnect both oxygen sensor and exhaust
gas temperature warning sensor connectors from
front exhaust pipe assembly.
WARNING:
Be careful as exhaust pipe is hot.
3) Raise vehicle with a jack and remove front
wheel.
4) Disconnect front exhaust pipe assembly.
5) Remove cotter pin and castle nut. Using a
puller, remove tie-rod end from knuckle arm.
G4M0097
6) Remove jack-up plate and stabilizer.
G4M0098
7) Disconnect one pipe joint A from center of gear-
box assembly, and connect a vinyl hose to it. While
turning steering wheel to the left and right, drain
fluid through the hose. Similarly, drain fluid from
the other pipe joint B.
G4M0786
8) Remove lower and upper bolts from universal
joint, and remove universal joint in the upward
direction.
NOTE:
Scribe alignment marks on universal joint so that it
can be reassembled at the original serration.
G4M0787
9) Remove flare nuts from control valve of gear-
box assembly, and disconnect upper and lower
hoses B and A.
CAUTION:
IAlways disconnect hoses B and A in that
order.
IBe careful not to damage the hoses during
removal.
10) Remove bolts securing gearbox to
crossmember, and detach gearbox.
B: DISASSEMBLY
1) Disconnect four pipes from gearbox.
2) Secure gearbox removed from vehicle in vice
using ST.
ST 926200000 STAND
CAUTION:
Secure the gearbox assembly in a vice using
the ST as shown. Do not attempt to secure it
without this ST.
G4M0788
27
[W4B0]4-3SERVICE PROCEDURE
4. Steering Gearbox (Power Steering System) [RHD model]

6. ABS System
A: SENSOR
B4M1441A
(1) G sensor
(2) Rear ABS sensor RH
(3) ABS spacer
(4) Rear ABS sensor LH(5) Front ABS sensor LH
(6) Front ABS sensor RHTightening torque: N´m (kg-m, ft-lb)
T1:
7.4±2.0 (0.75±0.2, 5.4±1.4)
T2:32±10 (3.3±1.0, 24±7)
14
4-4[C6A0]COMPONENT PARTS
6. ABS System

14. ABS Sensor
A: REMOVAL
1. FRONT ABS SENSOR
1) Disconnect front ABS sensor connector located
in engine compartment.
2) Remove bolts which secure sensor harness to
strut.
B4M0079A
3) Remove bolts which secure sensor harness to
body.
B4M1181A
4) Remove bolts which secure front ABS sensor to
housing, and remove front ABS sensor.
CAUTION:
IBe careful not to damage pole piece located
at tip of the sensor and teeth faces during
removal.
IDo not pull sensor harness during removal.
B4M1183A
5) Remove front disc brake caliper and disc rotor
from housing after removing front tire.6) Remove front drive shaft and housing and hub
assembly.
7) Remove tone wheel while removing hub from
housing and hub assembly.
CAUTION:
Be careful not to damage teeth faces of tone
wheel during removal.
G4M0444
2. REAR ABS SENSOR
1) Remove rear seat and disconnect rear ABS
sensor connector.
2) Remove rear sensor harness bracket from rear
trailing link and bracket.
3) Remove rear ABS sensor from rear back plate.
B4M1182A
4) Remove rear tone wheel while removing hub
from housing and hub assembly. [W2A0].>
CAUTION:
IBe careful not to damage pole piece located
at tip of the sensor and teeth faces during
removal.
IDo not pull sensor harness during removal.
B: 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.
52
4-4[W14A1]SERVICE PROCEDURE
14. ABS Sensor

2) Measure ABS sensor resistance.
B4M0248
ABS sensor Terminal No. Standard
Front - LH 1 and 2
1.0±0.2 kW Front - RH 1 and 2
Rear - LH 1 and 2
Rear - RH 1 and 2
CAUTION:
If resistance is outside the standard value,
replace ABS sensor with new one.
NOTE:
Check ABS sensor cable for discontinuity. If
necessary, replace with a new one.
2. 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 sen-
sor are installed correctly.
B4M1184A
ABS sensor clearance:
Front
0.9 Ð 1.4 mm (0.035 Ð 0.055 in)
Rear
0.7 Ð 1.2 mm (0.028 Ð 0.047 in)
NOTE:
IIf clearance is narrow, adjust by using spacer
(Part No. 26755AA000).
IIf clearance is wide, check the outputted voltage
then replace ABS sensor or tone wheel if the out-
putted voltage is outside the specification.
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.
B4M0118B
C: INSTALLATION
1. FRONT ABS SENSOR
1) Install tone wheel on hub, then install housing
on hub assembly.
2) Temporarily install front ABS sensor on hous-
ing.
CAUTION:
Be careful not to strike ABS sensor's pole
piece and tone wheel's teeth against adjacent
metal parts during installation.
B4M1183A
3) Install front drive shaft to hub spline. 4-2 [W1E0].>
53
[W14C1]4-4SERVICE PROCEDURE
14. ABS Sensor

4) Install front ABS sensor on strut and wheel
apron bracket.
Tightening torque:
32
±10 N´m (3.3±1.0 kg-m, 24±7 ft-lb)
B4M1181A
5) 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
perimeter, tighten ABS sensor on housing to speci-
fied torque.
ABS sensor standard clearance:
0.9 Ð 1.4 mm (0.035 Ð 0.055 in)
Tightening torque:
32
±10 N´m (3.3±1.0 kg-m, 24±7 ft-lb)
CAUTION:
Check the marks on the harness to make sure
that no distortion exists. (RH: white, LH: yel-
low)
NOTE:
If the clearance is outside specifications, readjust.
2. REAR ABS SENSOR
1) Install rear tone wheel on hub, then rear hous-
ing on hub.
2) Temporarily install rear ABS sensor on back
plate.
CAUTION:
Be careful not to strike ABS sensor's pole
piece and tone wheel's teeth against adjacent
metal parts during installation.
B4M1182A
3) Install rear drive shaft to rear housing and rear
differential spindle. 4) Install rear sensor harness on rear trailing link.
Tightening torque:
32
±10 N´m (3.3±1.0 kg-m, 24±7 ft-lb)
G4M0453
5) 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
perimeter, tighten ABS sensor on back plate to
specified torque.
ABS sensor standard clearance:
0.7 Ð 1.2 mm (0.028 Ð 0.047 in)
Tightening torque:
32
±10 N´m (3.3±1.0 kg-m, 24±7 ft-lb)
CAUTION:
Check the marks on the harness to make sure
that no distortion exists. (RH: white, LH: yel-
low)
NOTE:
If the clearance is outside specifications, readjust.
54
4-4[W14C2]SERVICE PROCEDURE
14. ABS Sensor

E: INSTALLATION
1) Install ABSCM&H/U.
CAUTION:
Confirm that the specifications of the
ABSCM&H/U conforms to the vehicle specifica-
tions.
Tightening torque:
18
±5 N´m (1.8±0.5 kg-m, 13.0±3.6 ft-lb)
B4M1222
2) Connect brake pipes to their correct
ABSCM&H/U connections.
Brake pipe tightening torque:
15+3/þ2N´m (1.5+0.3/þ0.2kg-m, 10.8+2.2/þ1.4ft-lb)
3) Using cable clip, secure ABSCM&H/U harness
to bracket.
4) Connect connector to ABSCM&H/U.
CAUTION:
IBe sure to remove all foreign matter from
inside the connector before connecting.
IEnsure that the ABSCM&H/U connetor is
securely locked.
5) Install air intake duct.
6) Connect ground cable to battery.
7) Bleed air from the brake system.
16. G Sensor
A: REMOVAL
1. FRONT ABS SENSOR
1) Disconnect front ABS sensor connector located
in engine compartment.
2) Remove bolts which secure sensor harness to
strut.
B4M1442A
3) Remove bolts which secure sensor harness to
body.
B4M1181A
4) Remove bolts which secure front ABS sensor to
housing, and remove front ABS sensor.
CAUTION:
IBe careful not to damage pole piece located
at tip of the sensor and teeth faces during
removal.
IDo not pull sensor harness during removal.
B4M1183A
5) Remove front disc brake caliper and disc rotor
from housing after removing front tire.
60
4-4[W15E0]SERVICE PROCEDURE
16. G Sensor

E: INSTALLATION
1) Install ABSCM&H/U.
CAUTION:
Confirm that the specifications of the
ABSCM&H/U conforms to the vehicle specifica-
tions.
Tightening torque:
18
±5 N´m (1.8±0.5 kg-m, 13.0±3.6 ft-lb)
B4M1222
2) Connect brake pipes to their correct
ABSCM&H/U connections.
Brake pipe tightening torque:
15+3/þ2N´m (1.5+0.3/þ0.2kg-m, 10.8+2.2/þ1.4ft-lb)
3) Using cable clip, secure ABSCM&H/U harness
to bracket.
4) Connect connector to ABSCM&H/U.
CAUTION:
IBe sure to remove all foreign matter from
inside the connector before connecting.
IEnsure that the ABSCM&H/U connetor is
securely locked.
5) Install air intake duct.
6) Connect ground cable to battery.
7) Bleed air from the brake system.
16. G Sensor
A: REMOVAL
1. FRONT ABS SENSOR
1) Disconnect front ABS sensor connector located
in engine compartment.
2) Remove bolts which secure sensor harness to
strut.
B4M1442A
3) Remove bolts which secure sensor harness to
body.
B4M1181A
4) Remove bolts which secure front ABS sensor to
housing, and remove front ABS sensor.
CAUTION:
IBe careful not to damage pole piece located
at tip of the sensor and teeth faces during
removal.
IDo not pull sensor harness during removal.
B4M1183A
5) Remove front disc brake caliper and disc rotor
from housing after removing front tire.
60
4-4[W15E0]SERVICE PROCEDURE
16. G Sensor

6) Remove front drive shaft and housing and hub
assembly.
7) Remove tone wheel while removing hub from
housing and hub assembly.
CAUTION:
Be careful not to damage teeth faces of tone
wheel during removal.
G4M0444
B: INSPECTION WITH CIRCUIT
TESTER
16B1 : CHECK G SENSOR.
1) Turn ignition switch to OFF.
2) Remove G sensor from vehicle.
3) Connect connector to G sensor.
4) Turn ignition switch to ON.
5) Measure voltage between G sensor connector
terminals.
Connector & terminal
(P11) No. 2 (+) Ð No. 3 (þ)
B4M0915
:Is the voltage 2.3±0.2 V when G sen-
sor is horizontal?
: Go to step16B2.
: Replace G sensor.16B2 : CHECK G SENSOR.
Measure voltage between G sensor connector ter-
minals.
Connector & terminal
(P11) No. 2 (+) Ð No. 3 (þ)
B4M0917A
:Is the voltage 3.9±0.2 V when G sen-
sor is inclined forwards to 90É?
: Go to step16B3.
: Replace G sensor.
16B3 : CHECK G SENSOR.
Measure voltage between G sensor connector ter-
minals.
Connector & terminal
(P11) No. 2 (+) Ð No. 3 (þ)
B4M0918A
:Is the voltage 0.7±0.2 V when G sen-
sor is inclined backwards to 90É?
: G sensor is normal.
: Replace G sensor.
61
[W16B3]4-4SERVICE PROCEDURE
16. G Sensor