1997 SUBARU LEGACY ABS

BRAKES
[ABS
5
.31
TYPE]
IT8V3]4-4d

8
.
Diagnostics
Chad
with
Trouble
Codeby
ABS
Warning
Light

F49

1
1
213141516
1
7
1
89
101112131415
161718192
21
23
242526
728293031

D
n

SL
B4M1243A

00000
E3
[']C~oo
oooovoa
onoooo
.ooo~
"
oo

°~
1

IIII
`
84M1272A

18V-,
CHECK
INPUT
VOLTAGE
OF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Run
the
engine
at
idle
.

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

chassis
ground
.

Connector
&
terminal

(F49)
No
.
1
(+)
-
Chassis
ground
(
)
:

(F49)
No
.
24
(+)
-
Chassis
ground
(
)
:

CHEGK
:
Is
the
voltage
between
10
V
and
15
V?

YES
:
Go
to
step
8V2
.

No
:
Repair
harness
connector
between
battery
and

ABSCM&H/U
.

8V2
I
CHECK
GROUND
CIRCUIT
Of
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
between
ABSCM&H!U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
23
-
Chassis
ground
:

CHECK
:
Is
the
resistance
leis
than0
.5
0?

Go
to
step
8V3
.

No
:
Repair
ABSCM&H/U
ground
harness
.

8V3
CHECK
VALVE
.
RELAY
IN
ABSCM&H/U
.

Measure
resistance
between
ABS,CM&H/U
and
terminals
.

Terminals

No
.
23
(+)
-
-
No
.
24
(-)

CHECK
:
Is
theresistance
amore
than
1'
MSZ?

YES
:
Go
to
step
8V4
.

No
:
Replace
ABSCM&H/U
.

75

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

I
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

1
8V4
I
CHECKPOOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

generator,
battery
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10
>

Repair
connector
.

No
:
Go
to
step
8V5
.

8V5
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erasethe
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

CHECK
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
8V6
.

8116
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
withthe
diagnosis
corresponding
tothe
trouble
code
.

No
:
A
temporary
poor
contact
.

76

4-4d
[TSWO]
BRAKES
[ABS
5
.3i
TYPE]
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

W
:
TROUBLE
CODE
52

-
ABNORMAL
MOTOR
AND/OR
MOTOR

RELAY
-

DIAGNOSIS
:

Faulty
motor

Faulty
motor
relay

Faulty
harness
connector

TROUBLE
SYMPTOM
:

e
ABS
does
not
operate
.

WIRING
DIAGRAM
:

ABS
control
moduleand
hydra
ulic
control
unit
SBF-6

Valve
relay~
F49
F28100
Fuse
IGN
sw
SBF-4
FL1
.25B

I
O---tY
Motor
~
bNo
.18
relay
'-

rw
Qm

Solenoid
valve

FL
inlet

FL
outlet

FR
inlet

FR
outlet

RL
inlet

RL
outlet

RR
inlet

RR
outlet

Pump
motor

M

E

E

F49100

11
3
1
4
1
5
11
1
1
2
13
1
14
1
1

12131
4
16171819
20
2122
1
1819
~
~
17
1
7
111
79
1
-10
1
31
1
2324526
11
1
171
1
31
1
41
1
51
1
6

B4M1255

78

BRAKES
[ABS
5
.3i
TYPE]
[T8W21
4-4d

S
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

(~~O)

q

1
2
3
4567
89
01112131415
1
16
1
17
1
18
1
19
1
2
01
21
1
23
242526
7
8293031

D

-V+
B4M
1256A

F49

1
L2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
01112131415
1617
1
18
1
19
1
2
01
21
12-
q
23
1
24
1
25
111
26
7
8293031

Dn

]t

B4M1257A

8W1
CHECK
INPUT
VOLTAGEOF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal

(F49)
No
.
25
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
the
voltage
between
10
V
and
15
V?

,rES
:
Go
t0step
8W2
.

No
:
Repair
harness/connector
between
battery
and

ABSCM&H/U
and
check
fuse
SBF6
.

SW2
CHECK
GROUND
CIRCUIT
OF
MOTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
26
-
Chassis
ground
:

CHECK
:
Is
the
resistance
less
than
0
.5
92?

vES
:
Go
to
step
8W3
.

No
:
Repair
ABSCM&H/U
ground
harness
.

79

4-4d
[T8W3]
BRAKES
[ABS
5
.3i
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

F49

D

P
V(4)
84M1234AI

F49

1
234,1567
89
1011112113
1
5
161
1
19
2
21
23
242526
728293031

f

1

D~

SL
84M
7243A

8W3
CHECK
INPUT
VOLTAGEOF
ABSCM&H/U
.

1)
Run
the
engine
at
idle
.

2)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
1
(+)
-
Chassis
ground
(
)
:

CHECK
:
is
the
voltage
between
10
V
and
15
V?

Go
tostep
8W4
.

No
:
Repair
harness
connector
between
battery,
igni-

tion
switch
and
ABSCM&H/U
.

8W4
I
CHECK
GROUND
CIRCUIT
OF
ABSCM&H/U
.
I

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
23
-
Chassis
ground
:

CHECK
:
Is
the
resistance
less
than
0
.5
S2?

~ves~
:
Go
to
step
8WS
.

No
:
Repair
ABSCM&H/U
ground
harness
.

8W5
I
CHECK
MOTOR
OPERATION
.I

Operate
the
sequence
control
<
Ref
.
to
4-4
[W25D1
]
.
>

NOTE
:

Use
the
diagnosis
connector
to
operatethe
sequence

control
.

cHEC~c
:
Can
motor
revolution
noise
{buzz)
be
heard

when
carrying
out
the
sequence
control?

Go
tostep
8W6
.

No
:
Replace
ABSCM&H/U
.

80

BRAKES
[ABS
5
.31
TYPE]
[TSW$]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

CHECKPOOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

generator,
battery
and
ABSCM&HI
U?
<
Ref
.

to
FOREWORD
[T3C1]
.*10>

vES
:
Repair
connector
.

No
:
Go
to
step
8W7
.

8W7
I
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
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
8W8
.

8W8
CHECK
ANY

IAPPE
RANCE
.
O
THER
TROUBLE
CODES

CHECK
:
Are
other
trouble
codes
being
output?

vES
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

81

4-4d
[Taxo1
BRAKES
[ABS
5
.3i
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

X
:
TROUBLE
CODE
54

-
ABNORMAL
STOP
LIGHT
SWITCH
-

DIAGNOSIS
:

Faulty
stop
light
switch

TROUBLE
SYMPTOM
:

e
ABS
does
notoperate
.

WIRING
DIAGRAM
:

Fuse
S8F-3
FL1
.258

No
.
12

F49
F2
8100
°
Stop
light
switch
172E
I
w
m

OV
LL

3~
E

ABS
control
B64
(Without
cruise
control)

module
and
865
(With
cruise
control)
hydraulic
control
unit

B64
865
8100
F49

123456789101112131415

M1
'
21
1
34
~
34
111
1
141
111
1920
16171819
20
2122
2324
25
26
27
1
28
1
29
1
3
013
11

B4M1258

82

BRAKES
[ABS
5
.31
TYPE]
[T8X5]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8X1
I
CHECK
STOP
LIGHTS
COME
ON
.

Depress
the
brake
pedal
.

CHECK
:
Do
stop
lights
come
on?

,rES
:
Go
to
step
8X2
.

No
:
Repair
stop
lights
circuit
.
I
$X2
I
CHECK
OPEN
CIRCUIT
IN
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Depress
brake
pedal

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?

YES
:
Go
to
step
8X3
.

No
:
Repair
harness
between
stop
light
switch
and

ABSCM&H/U
.

8X3
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connector
between

stop
light
switch
and
ABSCM&HlU?
<
Ref
.
to

FOREWORD
[T3C1]
.*70
>

,rES
:
Repair
connector
.

No
:
Go
to
step
8X4
.

18X4
I
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
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
8X5
.

8X5
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the
trouble
code
.

No
:
A
temporary
poor
contact
.

83