1997 SUBARU LEGACY ABS

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

10
.
Diagnostics
Chart
with
Select
Monitor

DIAGNOSIS
:

Faulty
harness/connector

Faulty
outlet
solenoid
valve

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49
SBF-4
FL1
.25B

ABS
control
module
and
hydraulic
control
unit

F2
8100
IGNsw

No

Fuse

8100
F49

12345678911111141

46
~
p
16171819
20
2122
23242526
11
1213141
161
1
19
2
27
1
28
1
29
1
30
1
31
1

B4M1245
I

143

Generator

4-4d
IT10U1]
BRAKES
[ABS
5
.31
TYPE]

10
.
DiagnosticsChart
with
Select
Monitor
F49

1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
0111131415
16171819
2
2123
24
2526
1281
2
913013
1
1

D

-V+
B4M
1234A

F49

1
1
213
1
4
1
5
1
6
1
7
1
8
1
9
101112131
15
161
1819
2
01
21
12-
23
242526
728293031
1

FM
n

]L
84M1243A

10U1
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
(-)
:

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

,rES
:
Go
to
step
10U2
.

No
:
Repair
harness
connector
between
battery,
igni-

tion
switch
and
ABSCM&H/U
.

10U2
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
less
than
0
.5
0?

,res
:
Go
to
step
10U3
.

No
:
Repair
ABSCM&H/U
ground
harness
.
1
10U3
I
CHECKPOOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

generator,
battery
and
ABSCM&HlU?
<
Ref
.

to
FOREWORD
(T3C1]
.*10
>

,rES
:
Repair
connector
.

No
:
Go
to
step
10U4
.

144

BRAKES
[ABS
5
.3i
TYPE]
[T10U5]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

I
10U4
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
thecurrent

diagnosis
still
being
output?

,mss
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10U5
.

10U5
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
.

145

4-4d
[T1
0V0]
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
41
(FBI)

ECU

B4M0962

V
:
TROUBLE
CODE
41
ECU

-
ABNORMAL
ABS
CONTROL
MODULE
-

DIAGNOSIS
:

*
Faulty
ABSCM&H/U

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydrau
l
is
control
unit
E

F49

123456789101112131415

16171819
20
2122
23
24
252627
1
28
1
29
1
30
1
31
1

84M1246

146

BRAKES
[ABS
5
.3i
TYPE]
[T10V5]4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

a

112131415161718
01112131415
11611711811912
1
23
24
2526
71
28
1
2130
1
31
1
1

La
-_
B4M
1243A

1
110111
CHECK
GROUND
CIRCUIT
OF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Measure
resistance
between
ABSCM&H/U
and
chassis

ground
.

Connector
&
terminal

(F49)
No
.
23
-
Chassis
ground
:

CHECK
:
Is
the
resistance
less
than0
.5
S2?

YES
:
Go
to
step
10V2
.

No
:
Repair
ABSCM&H/U
ground
harness
.

CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connectors
between

battery,
ignition
switch
and
ABSCM&HIU?

<
Ref
.
to
FOREWORD
[T3C1]
.*10
>

Repair
connector
.

No
:
Go
to
step
10V3
.

10V3
CHECK
SOURCES
OF
SIGNAL
NOISE
.

CHECK
:
Is
thecar
telephone
orthe
wireless
transmit-

ter
properly
installed?

vES
:
Go
to
step
110114
.

No
:
Properly
install
the
car
telephone
or
the
wireless

transmitter
.
1
110114
I
CHECK
SOURCES
OF
SIGNAL
NOISE
.
I

CHECK
;
Are
noise
sources
(such
as
an
antenna)

installed
near
the
sensorharness?

.rES
:
Install
the
noise
sources
apart
from
the
sensor

harness
.

No
:
Go
to
step
10V5
.

10V5
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
codeas
in
the
current

diagnosis
still
being
output?

Replace
ABSCM&H/U
.

No
:
Go
to
step
10V6
.

147

4-4d
[T1ovs1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

10V6
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
poor
contact
.

148

4-4d
[r1owo]
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

D
"
NEW
42
(FBI)

LOW
VOLTAGE

84M0963

W
:
TROUBLE
CODE
42
LOW
VOLTAGE

-
SOURCE
VOLTAGE
IS
LOW
-

DIAGNOSIS
:

9
Power
source
voltage
of
the
ABSCM&H/U
is
low
.

TROUBLE
SYMPTOM
:

9
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

F2
8100
Fuse
IGNswe

No
.18

SBF-4
FL1
.25B

8100
f49

12345678910111131415
1121314151
69
~
~
16171819
20
2122
23242526
11
1213141
16171819
2027
1
28
1
29
1
30
1
31
1

84M
1245

150

Generator

BRAKES
[ABS
5
.31
TYPE]
[T10W4]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

-
%mnnnur

B4M0430

[1
_
Owl
CHECKGENERATOR
.

1)
Start
engine
.

2)
Idling
after
warm-up
.

3)
Measure
voltage
between
generator
B
terminal
and

chassis
ground
.

Terminal

Generator
B
terminal
-
Chassis
ground
:

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

U
:
Go
tostep
10W2
.

No
:
Repair
generator
.

1OW2
CHECK
BATTERY
TERMINAL
.

Turn
ignition
switch
to
OFF
.

Are
the
positive
and
negative
battery
termi-

nals
tightly
clamped?

0
:
Go
to
step
10W3
.

No
:
Tighten
the
clamp
of
terminal
.

(CHECK
INPUT
VOLTAGE
OF
ABSCM&H/U
.

F49

1
1
2131415
1
6
1
7
1
89
1
10
1
11
1
12
1
13
1
14
11
5
1
16
71819
2
1
23242526
728293031
1

'L
L
a
84M1243A

1)
Disconnect
connector
from
ABSCM&H/U
.

2)
Run
the
engine
at
idle
.

3)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

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

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

,rES
:
Go
to
step
10W4
.

No
:
Repair
harness
connector
between
battery,
igni-

tion
switch
and
ABSCM&H/U
.

10W4
CHECK
GROUND
CIRCUIT
OF
ABSCM&HIU
.

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
SZ?

,rES
:
Go
tostep
10111115
.

No
:
Repair
ABSCM&H/U
ground
harness
.

151