SUBARU LEGACY 1997 Service Repair Manual

4-4d
[r1oaFa1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

B4M0972

AF
:
TROUBLE
CODE
54
BLS

-
ABNORMAL
STOP
LIGHT
SWITCH
-

DIAGNOSIS
:

e
Faulty
stop
light
switch

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

f49
F2
8100

ABS
control
module
and
hydraulic
control
unit

Fuse
SBF-3
FL1
.25B

No
.12

Stop
I
fight
switch

w

U

OV
tt

31311
(
E

B64
(Without
cruise
control)

865
(With
cruise
control)

B64
865
8100
F49

123456789101112131415
1
14
617
1
16
1
17
1
18
1
19
1
20
1
21
1
22
L
3
181
9
1
10
1
4
2526
1
2
4
1
1
11121131
14
1
1
51
161
11
1
81
1
91
20
1
q2
7
1281
29
13013
1
1

B4M1258

182

BRAKES
[ABS
5
.3i
TYPE]
[T10AF3J
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

BLS
(F09)

0
.
00
v

B4M0973
I

BLS
(F09)

12
.
00
V

84M1265

10AF1
HECKOUTPUT
OF
STOP
I
US
G
SELECT
MONITOR
.

LIGHT
SWITCH

1)
Press
[F],
[0]
and
[9]
on
the
select
monitor
.

2)
Depress
the
brake
pedal

3)
Read
the
stop
light
switch
output
on
the
select
moni-

tor
display
.

CFIECK
:
Is
the
reading
indicated
on
monitor
display

less
than
1
.5
V?

Go
to
step
10AF2
.

No
:
Go
to
step
10AF3
.

10AF2-
I
LIGHT
SWITCH
US
I
NG
SELECT
MONITOR
.

1)
Release
the
brakepedal
.

2)
Read
the
stop
light
switch
output
on
the
select
moni-

tor
display
.

CHECK
:
Is
the
reading
indicated
on
monitor
display

between
10
V
and
15
V?

0
:
Go
to
step
10AF5
.

No
:
Go
to
step
10AF3
.
1
10AF3
I
CHECK
IF
STOPLIGHTS
COME
ON
.

Depress
the
brake
pedal
.

CHECK
:
Do
stop
lights
turn
on?

Go
to
step
10AF4
.

No
:
Repair
stop
lightscircuit
.

183

4-4d
fr1oAFa1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

10AF4I
CHECK
OPEN
CIRCUIT
IN
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Depress
brakepedal
.

4)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
2
-
Chassis
ground
:

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

,rES
:
Go
tostep
10AF5
.

No
:
Repair
harness
between
stop
light
switch
and

ABSCM&H/U
connector
.

1
10AF5
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connector
between

stop
light
switch
and
ABSCM&HIU?
<
Ref,
to

FOREWORD
[T3C1]
.*10
>

vES
:
Repair
connector
.

No
:
Go
tostep
10AF6
.

10AF6
I
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

Replace
ABSCM&H/U
.

No
:
Go
to
step
10AF7
.

I10AF7
CHECK
ANY

1APPEARANCE

.THER
TROUBLE
CODES

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

184

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

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
56
(FBI)

G
SENSOR
LINE

84M0974

AG
:
TROUBLE
CODE
56
G
SENSOR
LINE

-
OPEN
OR
SHORT
CIRCUIT
OF

G
SENSOR
-

DIAGNOSIS
:

9
Faulty
G
sensoroutput
voltage

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

fi
P11

1
3
45678

P11

-
J
~
ABS
G
sensor
Mft

F49

131415
123456789101112
1
16
1
17
1
18
1
19
1
20
1
2
27
12
8
1
29
1
30
1
31
1
1
1
22
1
2324
5
26

B4M1260

186

BRAKES
[ABS
5
.31
TYPE]
[T10AG5]
4-4d

10
.
DiagnosticsChart
with
Select
Monitor

1997
(F00)

ABS
4WD
"
AT

H4M
11171

G-SENS
(F
10)

2
.30
V

sannos271

10AG1
HECK
I
US
G
SE
ECT,MONT
OR

OF
ABSCM&H/U

1)
Press
[F],
[0]
and
[0]
on
the
select
monitor
.

2)
Read
the
select
monitor
display
.

CH~K
:
Is
an
ABSCM&HlU
for
4WD
model
installed

on
a
FWD
model?

Replace
ABSCM&H/U
.

No
:
Go
to
step
10AG2
.

I10AG2
CHECK
OUTPUT

I
SELECT
MONITOR

F
G
SENSOR
USING

1)
Press
[F],
[1]
and
[0]
on
the
select
monitor
.

2)
Read
the
select
monitor
display
.

K
:
Is
theindicated
reading
between
2
.1
and
2
.5

V
when
the
G
sensor
is
in
horizontal
posi-

tion?

,rE$
:
Go
to
step
10AG3
.

Go
to
step
10AG6
.
I
10AG3
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connector
between

ABSCM&HIU
and
G
sensor?
<
Ref
.
to
FORE-

WORD
[T3C1]
.*10
>

Repair
connector
.

No
:
Go
tostep
10AG4
.

10AG4
CHECK
ABSCM&HlU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

c
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

Replace
ABSCM&H1U
.

No
:
Go
to
step
i0AG5
.

10AG5
CHECK
ANY
I
APPEARANCE

.THER
TROUBLE
CODES

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
withthe
diagnosis
corresponding
to
the

trouble
code
.

A
temporary
poor
contact
.

187

4-4d
RIonGS1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

FR
(
FES
)

0
km/
h

84M0977

FL(FE6)

0
km/
h

B4M0978

RR
(
FE7
)

0
km/
h

84M0379

RL
(FE8)

0
km/
h

84M0980

G-SENS
(FE14)

3
.70
V

B4M0981

10AG6
CHECK
FREEZE
FRAME
DATA
.

1)
Press
[F],
[E]
and
[5]
on
the
select
monitor
.

2)
Read
the
select
monitor
display
.

CHECK
:
Is
the
reading
indicated
on
monitor
display0

km?

C,rES~
:
Go
tostep
10AG7
.

No
:
Go
tostep
10AG15
.
1
10AG7
I
CHECK
FREEZE
FRAME
DATA
.

1)
Press
the
scroll
keyso
that
FE6
appears
on
the
moni-

tor
display
.

2)
Read
the
select
monitor
display
.

CHECK
:
Is
the
reading
indicated
on
monitor
display
0

km?

~
:
Go
to
step
10AG8
.

No
:
Go
to
step
10AG15
.

J
10AG8
I
CHECK
FREEZE
FRAME
DATA
.

1)
Press
the
scroll
key
so
that
FE7
appears
on
the
moni-

tor
display
.

2)
Read
the
select
monitor
display
.

ELK
:
Is
the
reading
indicated
on
monitor
display0

km?

Go
tostep
10AG9
.

No
:
Go
tostep
10AG15
.

10AG9
CHECK
FREEZE
FRAME
DATA
.

1)
Press
the
scroll
keyso
that
FE8
appears
on
the
moni-

tor
display
.

2)
Read
the
select
monitor
display
.

ECK
:
Is
the
reading
indicated
on
monitor
display0

km?

Go
to
step
10AG10
.

No
:
Go
to
step
10AG15
.
1
10AG10
I
CHECK
FREEZE
FRAME
DATA
.

1)
Press
the
scroll
keyso
that
FE14
appears
on
the
mon-

itor
display
.

2)
Read
the
select
monitor
display
.

CHECK
:
Is
the
reading
indicated
on
monitor
display

more
than3
.65
V?

Go
to
step
10AG11
.

No
:
Go
to
step
10AG15
.

188

BRAKES
[ABS
5
.31
TYPE][T10AG14]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

F49

1
23456
7
89
07112131415
1617118119120121122l--,
2
1
3
2425
2630

0

S2
B4M1261A

10AG11
I
PUT
HARNESS
A
DuGROUND
HARNESS
.T

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Measure
resistance
between
ABSCM&H/U
connector

terminals
.

Connector
&
terminal

(F49)
No
.
30
-
No
.
28
:

CHECK
:
Is
theresistance
between
4
.3
and
4
.9
kSZ?

Go
to
step
10AG12
.

No
:
Repair
harness/connector
between
G
sensor
and

ABSCM&H/U
.
I
10AG12
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connector
between

ABSCM&HlU
and
G
sensor?
<
ReL
to
FORE-

WORD
[T3C1].*T
0
>

Repair
connector
.

No
:
Go
to
step
10AG13
.
f
10AG13
I
CHECK
ABSCM&H/U
.

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?

Replace
ABSCM&H/U
.

No
:
Go
to
step
10AG14
.

10AG14
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

0
:
Proceed
with
thediagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

189

4-4d
[T70AG15]
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

V_

B4MO91
1
B

1
2
3
4
567
89
1011
131415
1017118119120121
23
242526
8
301

D

S2
B4M
1261
A

I
10AG15
1
CHECK
INPUT
VOLTAGE
OF
G
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
console
box
.

3)
Disconnect
G
sensor
from
body
.
(Do
not
disconnect

connector
.)

4)
Turn
ignition
switch
to
ON
.

5)
Measure
voltage
between
G
sensor
connector
termi-

nals
.

Connector
&
terminal

(P11)
No
.
i
(+)
-
No
.
3
(
)
:

CHECK
:
Is
the
voltage
between
4
.75
and
5
.25
V?

Go
to
step
10AG16
.

No
:
Repair
harness/connector
between
G
sensor
and

ABSCM&H/U
.

10AG16

I
P
UT
HARNESS
ANDUGROUND
HA
NESS
.T

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Measure
resistance
between
ABSCM&H/U
connector

terminals
.

Connector
&
terminal

(F49)
No
.
30
-
No
.
28
:

CHECK
:
Is
the
resistance
between
4
.3
and
4
.9
kS2?

,res
:
Go
to
step
10AG17
.

No
:
Repair
harness/connector
between
G
sensor
and

ABSCM&H/U
.

190

BRAKES
[ABS
5
.31
TYPE]
[T10AG19]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

84M09151

Front
\

84M0917A

10AG17
J
CHECK
GROUND

OUTPUT
RNESSHORT

IN
G
SENSOR

1)
Disconnect
connector
from
G
sensor
.

2)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
6
-
Chassis
ground
:

CHECK
:
Is
the
resistance
more
than
1
MW

U
:
Go
to
step
10AG18
.

No
:
Repair
harness
between
G
sensor
and

ABSCM&H/U
.
I
10AG18
1
CHECK
G
SENSOR
.

1)
Connect
connector
to
G
sensor
.

2)
Connect
connector
to
ABSCM&H/U
.

3)
Turn
ignition
switch
to
ON
.

4)
Measure
voltage
between
G
sensor
connector
termi-

nals
.

Connector
&
terminal
(P11)
No
.
2
(+)
-
No
.
1
(
)
:

CHECK
:
Is
the
voltage
between
2
.1
and
2
.5
V
when
G

sensor
is
horizontal?

Go
tostep
10AG19
.

No
:
Replace
G
sensor
.

I
10AG19
1
CHECK
G
SENSOR
.
I

Measure
voltage
between
G
sensor
connector
terminals
.

Connector
&
terminal
(P11)
No
.
2
(+)
-
No
.
1
(-)
:

c
:
Is
the
voltage
between
3
.7
and
4
.1
V
when
G

sensor
is
inclined
forwards
to
9a°?

~vES~
:
Go
to
step
10AG20
.

No
:
Replace
G
sensor
.

191

4-4d
R1oaG2o1
BRAKES
[ABS
5
.31
TYPE]
10
.
Diagnostics
Chad
withSelect
Monitor

0

Front

B4M0918A

I
10AG20
I
CHECK
G
SENSOR
.

Measure
voltage
between
G
sensor
connector
terminals
.

Connector
&
terminal
(P71)
No
.
2
(+)
-
No
.
1(
)
:

CHECK
:
Is
the
voltage
between
0
.5
and
0
.9
V
when
G

sensor
is
inclined
backwards
to
90°?

C,rES~
:
Go
to
step
10AG21
.

No
:
Replace
G
sensor
.
1
10AG21
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

ABSCM&Ht
U
and
G
sensor?
<
Ref
.
to
FORE-

WORD
[T3C1],*10
>

Repair
connector
.

No
:
Go
to
step
10AG22
.

I
10AG22
I
CHECK
ABSCM&H/U
.I

~
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

0
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AG23
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
outthe
trouble
code
.

10AG23
I
O
THER
TROUBLE
CODES

APPEARANCE
.

cK
:
Are
other
trouble
codes
being
output?

Proceed
with
thediagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

192