1997 SUBARU LEGACY ABS

BRAKES
[ABS
5
.31
TYPE]
IT8117i
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

814
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connectors
between

ABSCM&HlU
and
ABS
sensor?
<
Ref,
to

FOREWORD
[T3C1]
.*10
>

,rES
:
Repair
connector
.

No
:
Go
to
step8115
.

18115
1
CHECK
SOURCES
OF
SIGNAL
NOISE
.

CHECK
:
is
the
cartelephone
orthe
wireless
transmit-

ter
properly
installed?

Go
to
step
8116
.

No
:
Properly
install
the
car
telephone
or
the
wireless

transmitter
.

6
I
CHECK
SOURCES
OF
SIGNAL
NOISE
.

Are
noise
sources
(such
as
an
antenna)

installed
near
the
sensor
harness?

8100

1
1
-
1
2
01
19
1
1
81
17
11
6
11
!
98
7
65432
1111
11

D

fl
-0
Q
0

B4M1244A

vES
:
Install
the
noise
sources
apart
from
the
sensor

harness
.

No
:
Go
to
step
8117
.

8117
CHECK
SHIELD
CIRCUIT
.

1)
Connect
all
connectors
.

2)
Measure
resistance
between
shield
connector
and

chassis
ground
.

Connector
&
terminal

Trouble
code
22
I
(8100)
No
.
11
-
Chassis
ground
:

Trouble
code
24
/
(8100)
No
.
2
-
Chassis
ground
:

Trouble
code
26
/
Go
to
step
8118
.

Trouble
code
28
/
Go
to
step
8118
.

CHECK
;
Is
the
resistance
less
than
0
.5
0?

Go
to
step
8118
.

No
:
Repair
shield
harness
.

45

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

18118
1
CHECKABSCM&HIU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

CHECK
:
Is
the
same
trouble
code
as
in
the
current

diagnosis
still
being
output?

YES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step8119
.

8,19
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

,rES
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
noise
interference
.

46

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

J
:
TROUBLE
CODE
29

-
ABNORMAL
ABS
SENSOR
SIGNAL
(ANY

ONE
OF
FOUR)
-

DIAGNOSIS
:

"
Faulty
ABS
sensor
signal
(noise,
irregular
signal,
etc
.)

Faulty
tone
wheel

"
Wheels
turning
freely
for
a
long
time

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

OUTBACK
with
steproof
model
8~5
O

(2D
QD
CD
(
:D

LLL]
IWI

0
100

1
2
1
10
1
4
15161
7
1
8
1

RearABS
sensorLH

RearABS
sensor
RH

r-----------------i
I
OUTBACK
withsteproof
model
I
I
Q
I

RearABS
sensor
LH

II
j
~
Rear
ABS
j
sensor
RH

I
O
I
~---------------
.J

Front
ABS
sensor
LH

Front
ABS
sensor
RH

F49

r-j
i
1
2
1
5
1
4
1
5
1
6
1
7
1
8
1
9
1
1
01
11
1
12
1
131415
ll
16171819
202122
4
26
4
7
1
28
1
29
1301
31
1

B4M1238

48

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

4-4d
[TSJs1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

G4M0700
I

G4M0701

CHECK
INSTALLATION
OF
TONE
WHEEL
.

Tightening
torque
:

13
f
3
N~m
(1.3
f
0
.3
kg-m,
9
f
2
.2
ft-Ib)

CHECK
:
Are
the
tone
wheel
installation
bolts
tight-

ened
securely?

,res
:
Go
to
step
8J7
.

No
:
Tightentone
wheel
installation
bolts
securely
.

8J7
I
CHECK
ABS
SENSOR
GAP
.

Measure
tone
wheel
to
pole
piece
gap
over
entire
perim-

eter
of
the
wheel
.

CHECK
:
Is
the
gap
within
thespecifications
shown
in

the
following
table?

Front
wheel
Rear
wheel

Specifications
0
.9
-
1.4
mm

(0
.035
-
0
.055
in)
0
.7
-
1.2
mm

(0
.028
-
0
.047
in)

,
.ES
:
Go
tostep
8J8
.

No
:
Adjust
the
gap
.

NOTE
:

Adjustthe
gap
using
spacer
(Part
No
.
26755AA000)
.
If

spacers
cannot
correct
the
gap,
replace
worn
sensor
or

worn
tone
wheel
.

18,18
1
CHECK
OSCILLOSCOPE
.

Is
an
oscilloscopeavailable?

YES
:
Go
to
step
8J9
.

No
:
Go
to
step
8,1110
.

8J9
I
CHECK
ABS
SENSOR
SIGNAL
.

1)
Raise
all
four
wheels
of
ground
.

2)
Turn
ignition
switch
OFF
.

3)
Connect
theoscilloscope
to
the
connector
(F1)
or
con-

nector(B100)
.

4)
Turn
ignition
switch
ON
.

50

t
Sensor
gap

Sensor
gap

BRAKES
[ABS
5
.31
TYPE]
[T8J12]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

5)
Rotate
wheels
and
measure
voltage
at
specified
fre-

quency
.

NOTE
:

When
this
inspection
is
completed,
the
ABS
control
mod-

ule
sometimes
stores
the
trouble
code
29
.

Connector
&
terminal
(B100)
No
.
12
(+)
-
No
.
13
(-)
(Front
RH)
:

(8100)
No
.
3
(+)
-
No
.
4
(
)
(Front
LH)
:

(F1)
No
.
4
(+)
-
No
.
5
(
)
(Rear
RH)
:

(F7)
No
.
1
(+)
-
No
.
2
(
)
(Rear
LH)
:

Specifiedvoltage
:
0.12
-
1
V
(When
it
is
20
Hz
.)

CHECK
:
Is
oscilloscopepattern
smooth,
as
shown
in

figure?

,rES
:
Go
tostep
8J13
.

No
:
Go
tostep
8,1110
.

8J10
CHECK

IOR
ONE

CONTAM

WHEEL'NATION

OF
ABS
SENSOR

Remove
disc
rotor
from
hub
.

CHECK
:
Is
the
ABS
sensor
pole
piece
or
the
tone

wheel
contaminated
by
dirt
or
other
foreign

matter?

,rES
:
Thoroughly
remove
dirt
or
other
foreign
matter
.

No
:
Go
to
step
8J11
.

8J11
CHECK
DAMAGE
OF
ABS
SENSOR
OR
TONE
WHEEL
.

CHECK
;
Are
there
broken
or
damaged
teeth
in
the

ABS
sensor
pole
piece
or
the
tone
wheel?

,rES
:
Replace
ABS
sensor
or
tone
wheel
.

No
:
Go
tostep
8
.112
.

18,11
2
1
CHECK
HUB
RUNOUT
.

Measure
hub
runout
.

CHECK
:
Is
the
runout
less
than
0
.05
mm
(0
.0020
in)?

,rES
:
Go
to
step
8,1113
.

No
:
Repair
hub
.

51

4-4d[T8J13]
BRAKES
[ABS
5
.3i
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8
.113
CHECK
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
all
connectors
.

3)
Erase
the
memory
.

4)
Perform
inspection
mode
.

5)
Read
outthe
trouble
code
.

CHECK
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

.rES
:
Replace
ABSCM&H/U

No
:
Go
to
step
8J14
.

CHECK
ANYOTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

,rES
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

52

4-4d
[TsKO1
BRAKES
[ABS
5
.3i
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

K
:
TROUBLE
CODE
31
(FRONT
RH)

L
:
TROUBLE
CODE
33
(FRONT
LH)

M
:
TROUBLE
CODE
35
(REAR
RH)

N
:
TROUBLE
CODE
37
(REAR
LH)

-
ABNORMAL
INLET
SOLENOID
VALVE

CIRCUIT(S)
IN
ABSCM&H/U
-

DIAGNOSIS
:

Faulty
harness/connector

"
Faulty
inlet
solenoid
valve
in
ABSCM&H/U

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49
SBF-4
FL1
.258

ABS
control
module
and
hydraulic
control
unit

F2
8100
IGN
sw

No

Fuse

8100
F49

12345678910111131415

H23
1
4
1
5
1
6
9
~
~
16171819
20
2122
23242526
12
1
13
1
14
1
1
51
115
1
181922728293031

B4M1245

54

Generator