1997 SUBARU LEGACY tire pressure

4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]

1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection

1
.
Supplemental
Restraint
System

"Airbag"

Airbagsystem
wiring
harness
is
routed
near
the
ABS

sensor,
ABS
control
module
and
hydraulic
control
unit
.

CAUTION
:

All
Airbag
system
wiring
harness
and
connectors
are

colored
yellow
.
Do
not
use
electrical
test
equipment
on

these
circuit
.

e
Be
careful
not
to
damage
Airbag
system
wiring
har-

ness
when
servicing
the
ABS
sensor,
ABS
control
mod-

ule
and
hydraulic
control
unit
.

2
.
Pre-inspection
Before
performing
diagnostics,
check
the
following
items

which
might
affect
ABS
problems
:

A
:
MECHANICAL
INSPECTION

1
.
POWER
SUPPLY

1)
Measure
battery
voltage
and
specific
gravity
of
electro-

lyte
.

Standard
voltage
:
12
V,
or
more

Specific
gravity
:
Above
1
.260

2)
Check
the
condition
of
the
main
and
other
fuses,
and

harnesses
and
connectors
.
Also
check
for
proper
ground-

ing
.

2
.
BRAKE
FLUID

1)
Check
brake
fluidlevel
.

2)
Check
brake
fluid
leakage
.

3
.
BRAKEDRAG

Check
brake
drag
.
<
Ref
.
to
4-4
[K100].*1
>

4
.
BRAKE
PADAND
ROTOR

Check
brake
padand
rotor
.
<
Ref
.
to
4-4
[K100].*1
>

5
.
TIRE
SPECIFICATIONS,
TIRE
WEARAND
AIR

PRESSURE

Check
tire
specifications,
tire
wear
and
air
pressure
.
<
Ref
.

to
4-2
[S1
A1
],
[S1
A2]
.*1
>

2

4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]

1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection

1
.
Supplemental
Restraint
System

"Airbag"

Airbagsystem
wiring
harness
is
routed
near
the
ABS

sensor,
ABS
control
module
and
hydraulic
control
unit
.

CAUTION
:

All
Airbag
system
wiring
harness
and
connectors
are

colored
yellow
.
Do
not
use
electrical
test
equipment
on

these
circuit
.

e
Be
careful
not
to
damage
Airbag
system
wiring
har-

ness
when
servicing
the
ABS
sensor,
ABS
control
mod-

ule
and
hydraulic
control
unit
.

2
.
Pre-inspection
Before
performing
diagnostics,
check
the
following
items

which
might
affect
ABS
problems
:

A
:
MECHANICAL
INSPECTION

1
.
POWER
SUPPLY

1)
Measure
battery
voltage
and
specific
gravity
of
electro-

lyte
.

Standard
voltage
:
12
V,
or
more

Specific
gravity
:
Above
1
.260

2)
Check
the
condition
of
the
main
and
other
fuses,
and

harnesses
and
connectors
.
Also
check
for
proper
ground-

ing
.

2
.
BRAKE
FLUID

1)
Check
brake
fluidlevel
.

2)
Check
brake
fluid
leakage
.

3
.
BRAKEDRAG

Check
brake
drag
.
<
Ref
.
to
4-4
[K100].*1
>

4
.
BRAKE
PADAND
ROTOR

Check
brake
padand
rotor
.
<
Ref
.
to
4-4
[K100].*1
>

5
.
TIRE
SPECIFICATIONS,
TIRE
WEARAND
AIR

PRESSURE

Check
tire
specifications,
tire
wear
and
air
pressure
.
<
Ref
.

to
4-2
[S1
A1
],
[S1
A2]
.*1
>

2

4-4d
[TSao]
BRAKES
[ABS
5
.3i
TYPE]

6
.
Diagnostics
Chart
for
On-board
Diagnosis
System

Condition
a)
Brakes
Deceleration
:
g

O
Continuous
/
Olntermittent

b)
AcceleratorAcceleration
:
g

O
Continuous
/
O
Intermittent

c)
Vehicle
speed
km/h
MPH

O
Advancing

O
Accelerating

O
Reducing
speed

O
Low
speed

O
Turning

D
Others

d)
Tire
inflation
pressure
Front
RH
tire
:
kPa

Front
LH
tire
:
kPa

Rear
RH
tire
:
kPa

Rear
LH
tire
:
kPa

e)
Degree
of
wear
Front
RH
tire

Front
LH
tire

Rear
RH
tire

Rear
LH
tire

f)
Genuine
parts
are
used
.:
Yes
/
ONo

g)
Chain
is
passed
around
tires
.:
Yes
/
DNo

h)
T
tire
is
used
.:
Yes
/
ONo

i)
Condition
of
suspension
alignment

j)
Loading
state

k)
Repair
parts
are
used
.
:
OYes
/
ONo

What

I)
Others

14

BRAKES
[ABS
5
.31
TYPE]
[T8J5]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

811
CHECK

FREELY'FOR
ALONG
TIME
.

TURNED

Check
if
the
wheels
havebeen
turned
freely

for
more
than
one
minute,
such
as
when
the

vehicle
is
jacked-up,
under
full-lock
corner-
ing
or
when
fire
is
not
in
contact
with
road

surface
.

The
ABS
is
normal
.
Erase
the
trouble
code
.

NOTE
:

When
the
wheels
turn
freely
for
along
time,
such
as
when

the
vehicle
is
towed
or
jacked-up,
or
when
steering
wheel

is
continuouslyturned
all
the
way,
this
trouble
code
may

sometimes
occur
.

No
:
Go
to
step
8,12
.

18J2
I
CHECK
TIRE
SPECIFICATIONS
.

CHECK
:
Are
the
fire
specifications
correct?

,res
:
Go
tostep8
.113
.

No
:
Replace
tire
.

18,13
1
CHECK
WEAR
OF
TIRE
.

CHECK
:
Is
the
fire
worn
excessively?

,res
:
Replace
tire
.

No
:
Go
tostep
8,14
.

18J4
I
CHECK
TIRE
PRESSURE
.

CHECK
:
Is
the
fire
pressure
correct?

,rES
:
Go
to
step
8J5
.

No
:
Adjust
tire
pressure
.

18,15
1
CHECK
INSTALLATION
OF
ABS
SENSOR
.

Tighteningtorque
:

32
f
10
N~m
(3
.3
f
1
.0
kg-m,
24
±
7
ft-Ib)

CHECK
:
Are
the
ABS
sensor
installation
bolts
tight-

ened
securely?

,res
:
Go
to
step
8J6
.

No
:
Tighten
ABS
sensor
installation
bolts
securely
.

49

BRAKES
[ABS
5
.31
TYPE]
[T10M5]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

iomi
CHECK

(FREE
Y'FOR

THE

AILONG
TIMEVE

TURNED

CHECK
:
Check
if
the
wheels
have
been
turned
freely

for
more
than
one
minute,
suchas
when
the

vehicle
is
jacked-up,
under
full-lock
corner-

ing
or
when
fire
is
not
in
contact
with
road

surface
.

,rES
:
The
ABS
is
normal
.
Erase
the
trouble
code
.

NOTE
:

When
the
wheels
turn
freelyfor
a
long
time,
such
as
when

the
vehicle
is
towed
or
jacked-up,
or
when
steering
wheel

is
continuously
turned
all
the
way,
this
trouble
code
may

sometimes
occur
.

No
:
Go
to
step
10M2
.

10M2
CHECK
TIRE
SPECIFICATIONS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Are
the
fire
specifications
correct?

,rES
:
Go
to
step
10M3
.

No
:
Replace
tire
.
1
10M3
I
CHECK
WEAR
OF
TIRE
.

Is
the
fire
worn
excessively?

vES
:
Replace
tire
.

No
:
Go
to
step
10M4
.
1
10M4
I
CHECK
TIRE
PRESSURE
.

CHECK
:
Is
the
fire
pressure
correct?

Go
to
step
10M5
.

No
:
Adjust
fire
pressure
.

1
10M5
I
CHECK
INSTALLATION
OF
ABS
SENSOR
.

Tightening
torque
:

32
f
10
N~m
(3
.3
f
1
.0
kg-m,
24
f
7
ft-Ib)

CHECK
:
Are
the
ABS
sensor
installation
bolts
tight-

ened
securely?

,rES
:
Go
to
step
10M6
.

No
:
Tighten
ABS
sensor
installation
bolts
securely
.

133

BRAKES
[ABS
5
.31
TYPE]
[T11A0]
4-4d

11
.
General
Diagnostics
Table

11
.
General
Diagnostics
Table

A
:
SYMPTOMSAND
PROBABLE
CAUSES

Symptom
Probable
faulty
units/parts

9
ABSCM&H/U
(solenoid
valve)
e
ABS
sensor
e
Brake
(caliper
&
piston,
pads)
Vehicle
pulls
to
either
side
.
*
Wheel
alignment
e
Tire
specifications,
tire
wear
and
air
pressures
9
Incorrect
wiringorpiping
connections
Vehicle
instability
during
braking
9Road
surface(uneven,
camber)

e
ABSCM&H/U
(solenoid
valve)
e
ABS
sensor
Vehicle
spins
.
*
Brake
(pads)
9
Tire
specifications,
tire
wear
and
air
pressures
9
Incorrect
wiring
orpiping
connections

9
ABSCM&H/U
(solenoid
valve)
Brake
(pads)
Long
braking/stopping
distance
*
Air
in
brake
line
9Tire
specifications,
tire
wear
and
air
pressures
a
Incorrect
wiringor
piping
connections

9
ABSCM&H/U
(solenoid
valve,
motor)
Wheel
locks
.
*
ABS
sensor
*
Incorrect
wiringorpiping
connections

9
ABSCM&H/U
(solenoidvalve)9
ABS
sensor
Master
cylinder
Brake
dragging
*
Brake
(caliper
8
piston)
Parking
brake
Poor
braking
*
Axle
&
wheels
Brake
pedal
play

Long
brake
pedal
stroke
9
Air
in
brake
line
Brake
pedal
play

*
Suspension
play
or
fatigue
(reduced
damping)
Vehicle
pitching
*
Incorrect
wiring
or
piping
connections
Road
surface
(uneven)

9
ABSCM&H/U
(solenoid
valve)
9
ABS
sensor

Unstable
or
uneven
braking
~
Brake
(caliper
&
piston,
pads)
~Tire
specifications,
tire
wear
and
air
pressures
e
Incorrect
wiring
orpiping
connections
*
Road
surface
(uneven)

Excessive
pedal
vibration
*
Incorrect
wiring
or
piping
connections
Road
surface
(uneven)

*
ABSCM&H/U
(mount
bushing)
Noise
from
ABSCM&H/U
*
ABS
sensor
Brake
piping

a
RBSCM&
H/U
(mount
bushing)
e
ABS
sensor

Vibration
and/or
noise
(while
*
Master
cylinder

driving
on
slippery
roads)
Noise
from
front
of
vehiclee
Brake
(caliper
&
piston,
pads,
rotor)
Brake
piping
e
Brake
booster
&
check
valve
*
Suspension
playor
fatigue

e
ABS
sensor
a
Brake
(caliper
&
piston,
pads,
rotor)
Noise
from
rear
of
vehicle
9
Parking
brake
Brake
piping
e
Suspension
playor
fatigue

209

Symptom and possible cause Remedy
5. Noises when cornering


1Damaged differential gear. Replace.


2Excessive wear or damage of thrust washer. Replace.


3Broken pinion mate shaft. Replace.


4Seized or damaged side bearing. Replace.
6. Gear noises
Since noises from engine, muffler, transmission, propeller shaft, wheel bearings, tires, and body are sometimes mistaken for noises
from differential assembly, be careful in checking them. Inspection methods to locate noises include coasting, accelerating, cruising,
and jacking-up all four wheels. Perform these inspections according to condition of trouble. When listening to noises, shift gears into
four wheel drive and fourth speed position, trying to pick up only differential noise.


1Improper tooth contact of hypoid gear. Readjust or replace hypoid gear set.


2Improper backlash for hypoid gear. Readjust.


3Scored or chipped teeth of hypoid gear. Replace hypoid gear set.


4Seized hypoid gear. Replace hypoid gear set.


5Improper preload for front or rear bearings. Readjust.


6Seized, scored, or chipped front or rear bearing. Replace.


7Seized, scored, or chipped side bearing. Replace.


8Vibrating differential carrier. Replace.
2. Propeller Shaft
Symptom and possible cause Remedy
1. Vibration of propeller shaft
Vibration is caused by propeller shaft during operation and is transferred to vehicle body. Generally vibration increase in proportion to
vehicle speed.


1Worn or damaged universal joint. Replace.


2Unbalanced propeller shaft due to bend or dent. Replace.


3Loose installation of propeller shaft. Retighten.


4Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
2. Tapping when starting and noise while cruising, caused by propeller shaft.


1Worn or damaged universal joint. Replace.


2Worn spline of sleeve yoke. Replace.


3Loose installation of propeller shaft. Retighten.


4Loose installation of joint. Replace.


5Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
NOTE:
Vibration while cruising may be caused by an unbalanced
tire, improper tire inflation pressure, improper wheel
alignment, etc.
41
3-4DIAGNOSTICS
1. Rear Differential - 2. Propeller Shaft

Symptom and possible cause Remedy
5. Noises when cornering


1Damaged differential gear. Replace.


2Excessive wear or damage of thrust washer. Replace.


3Broken pinion mate shaft. Replace.


4Seized or damaged side bearing. Replace.
6. Gear noises
Since noises from engine, muffler, transmission, propeller shaft, wheel bearings, tires, and body are sometimes mistaken for noises
from differential assembly, be careful in checking them. Inspection methods to locate noises include coasting, accelerating, cruising,
and jacking-up all four wheels. Perform these inspections according to condition of trouble. When listening to noises, shift gears into
four wheel drive and fourth speed position, trying to pick up only differential noise.


1Improper tooth contact of hypoid gear. Readjust or replace hypoid gear set.


2Improper backlash for hypoid gear. Readjust.


3Scored or chipped teeth of hypoid gear. Replace hypoid gear set.


4Seized hypoid gear. Replace hypoid gear set.


5Improper preload for front or rear bearings. Readjust.


6Seized, scored, or chipped front or rear bearing. Replace.


7Seized, scored, or chipped side bearing. Replace.


8Vibrating differential carrier. Replace.
2. Propeller Shaft
Symptom and possible cause Remedy
1. Vibration of propeller shaft
Vibration is caused by propeller shaft during operation and is transferred to vehicle body. Generally vibration increase in proportion to
vehicle speed.


1Worn or damaged universal joint. Replace.


2Unbalanced propeller shaft due to bend or dent. Replace.


3Loose installation of propeller shaft. Retighten.


4Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
2. Tapping when starting and noise while cruising, caused by propeller shaft.


1Worn or damaged universal joint. Replace.


2Worn spline of sleeve yoke. Replace.


3Loose installation of propeller shaft. Retighten.


4Loose installation of joint. Replace.


5Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
NOTE:
Vibration while cruising may be caused by an unbalanced
tire, improper tire inflation pressure, improper wheel
alignment, etc.
41
3-4DIAGNOSTICS
1. Rear Differential - 2. Propeller Shaft