1997 SUBARU LEGACY brake sensor

4-4d
[T10AH0]
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

D
"
NEW
56
(FBI)

G
SENSOR
+B

B4M0982

AH
:
TROUBLE
CODE
56
GSENSOR+
B

-
BATTERY
SHORT
OF
G
SENSOR
-

DIAGNOSIS
:

*
Faulty
G
sensor
output
voltage

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
contro
I
unit

Ft
P11

12
3
45678

P1
Pt1

-~
~
ABS
G
sensor

F,
TM

F49

1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
1
10
1
11
1
12
1
1314
15
1
16111819
0
212223
24252627
1
28
1
29
1
30
1
31
1

B4M7260

194

BRAKES
[ABS
5
.31
TYPE]
(T10AH3]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

G-SENS
(F
10)

2
.30
V

sannos271

F49

1
23
4
5
6
.1
7
1
8
1
9
01112131415
16171
192C
12
2324
2526
728293031
11

D

_
V
B4M1263A

I10AH1
CHECK
OUTPUT

(SELECT
MONITORF

G
SENSOR
USING

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

2)
Read
the
select
monitor
display
.

CHECK
;
Is
theindicated
reading
between
2
.1
and
2
.5

V
when
the
G
sensor
is
in
horizontal
posi-

tion?

Replace
ABSCM&H/U
.

No
:
Go
tostep
10AH2
.

1
10AH2
I
CHECK
BATTERY
SHORT
OF
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
console
box
.

3)
Disconnect
connector
from
G
sensor
.

4)
Disconnect
connector
from
ABSCM&H/U
.

5)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
6
(+)
-
Chassis
ground
(
)
:

CHECK
;
Is
thevoltage
less
than1
V?

Go
tostep
10AH3
.

No
:
Repair
harness
between
G
sensor
and

ABSCM&H/U
.
1
10AH3
I
CHECK
BATTERY
SHORT
OFHARNESS
.

1)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal
(F49)
No
.
6
(+)
-
Chassis
ground
(
)
:

CHECK
;
Is
the
voltage
less
than
1
V?
vES
:
Go
tostep
10AH4
.

No
:
Repair
harness
between
G
sensor
and

ABSCM&H/U
.

195

4-4d
[ryoaio]
BRAKES
[ABS
5
.31
TYPE]
10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
56

G
SENSOR

(FBI)

H
~t

84M0984

AI
:
TROUBLE
CODE
56
G
SENSOR
Hg

-
ABNORMAL
G
SENSOR
HIGH
g
OUTPUT
-

DIAGNOSIS
:

*
Faulty
G
sensor
output
voltage

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

(D
(5

=
1
;3
14151617
R8
F,
TM

QD

r-l
11
213141516171819110111112113114115
1
1161171181191201
122
23242526
27
1
28
1
29
1
30
1
31
1

84M1260
I

P1
P11

-~
~
ABS
G
sensor

198

BRAKES
[ABS
5
.3i
TYPE]
R1oaia1
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

G-
SENS
(F
10)

2
.30
V

B4M0927

I10A11
CHECK
OUTPUT

(SELECT
MONITORF

G
SENSOR
USING

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

2)
Read
the
select
monitor
display
.

CHECK
:
Is
theindicated
reading
2
.3
±
0
.2
V
when
the

G
sensor
isin
horizontal
position?

Go
to
step
10AI2
.

No
:
Go
to
step
10A16
.

2
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

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

WORD
(T3C1]
.*10
>

Repair
connector
.

No
:
Go
to
step
10AI3
.

diagnosis
still
being
output?

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AI4
.

10A13
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
the
current

10A14
I
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

199

4-4d
['<10A15]
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

F49

11
2
3
4
5
67
89
0111213415
16171819
221
23
24
2526
27
?d2
30
1

D

S2
84M
1261
A

10A15
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&HlU
connector

terminals
.

Connector
&
terminal

(F49)
No
.
30
-
No
.
28
:

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

Go
tostep
10A16
.

No
:
Repair
harness/connector
between
G
sensor
and

ABSCM&H/U
.

10A16
CHECK
GROUND
SHOAT
OF
HARNESS
.

Measure
resistance
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
28
--
Chassis
ground
:

Is
the
resistance
more
than1
MSZ?

,rss
:
Go
to
step
10A17
.

No
:
Repair
harness
between
G
sensor
and

ABSCNi&H/U
.

Replace
ABSCM&HlU
.

200

BRAKES
[ABS
5
.3i
TYPE]
[T10AI9]
4-4d

10
.
DiagnosticsChart
with
Select
Monitor

saMOS1s

Front
`
'--"~°°u-~
'

-'

0

B4M0917A

0

Front

Y-'
-
rm~mnm,-,
\

B4M0918A

110A17CHECK
G
SENSOR
.

1)
Remove
console
box
.

2)
Remove
G
sensor
from
vehicle
.

3)
Connect
connector
to
G
sensor
.

4)
Connect
connector
to
ABSCM&H/U
.

5)
Turn
ignition
switch
to
ON
.

6)
Measure
voltage
between
G
sensor
connector
termi-

nals
.

Connector&
terminal

(P11)
No
.
2
(+)
-
No
.
1(
)
:

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

sensor
is
horizontal?

,rES
:
Go
to
step
10A18
.

No
:
Replace
G
sensor
.

10A18
CHECK
G
SENSOR
.

Measure
voltage
between
G
sensor
connector
terminals
.

Connector
&
terminal
(R70)
No
.
2
(+)
-
No
.
1
(
)
:

CHECK
:
Is
thevoltage
between
3
.7
and
4
.1
V
when
G

sensor
is
inclined
forwards
to
90°?

Go
to
step
10A19
.

No
:
Replace
G
sensor
.

10A19
CHECK
G
SENSOR
.

Measure
voltage
between
G
sensor
connector
terminals
.

Connector
&
terminal
(R70)
No
.
2
(+)
-
No
.
1(
)
:

CHECK
;
Is
thevoltage
between
0
.5
and
0
.9
V
when
G

sensor
is
inclined
backwards
to
90°?

Go
to
step
10A110
.

No
:
Replace
G
sensor
.

201

4-4d
[TIoAJo]
BRAKES
[ABS
5
.31
TYPE]
10
.
Diagnostics
Chart
withSelect
Monitor

D
"
NEW
56
(FBI)

G
SENSOR
STICK

84M0813
I

AJ
:
TROUBLE
CODE
56
G
SENSOR
STICK

-
G
SENSOROUTPUT
IS
STUCK
-

DIAGNOSIS
:

*
Faulty
G
sensoroutput
voltage

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

f19

ABS
control
module

R49R70

ABS
G
sensor

Shield
joint
connector

O
F48
R70

91101111121
W5J
II
ILl31

F49

H4M1111
I

204

BRAKES
[ABS
5
.3i
TYPE]
[T10AJ4]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

G-SENS
(F
10)

2
.30
v

B4M0927
I

Front

r

0

B4M0917A

0

Front

a
B4M0918A

I10AJ1
CHECK
(
TURN
NG

LL
FOUR
WHEELS
FOR
FREE

CHECK
:
Have
the
wheels
been
turned
freely
such
as

when
the
vehicle
is
lifted
up,
or
operatedon
a
rolling
road?

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

No
:
Go
to
step
10AJ2
.

J2
CHECK
OUTPUT

I
SEL
CT
MONITORF

G
SENSOR
USING

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

2)
Read
the
select
monitor
display
.

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

Vwhen
the
vehicle
is
in
horizontalposition?

ves
:
Go
to
step
10AJ3
.

No
:
Go
to
step
10AJ8
.

I10AJ3
CHECK
OUTPUT

(SELECT
MONITORF

G
SENSOR
USING

1)
Turn
ignition
switchto
OFF
.

2)
Remove
console
box
.

3)
Remove
G
sensorfrom
vehicle
.
(Do
notdisconnect

connector
.)

4)
Turn
ignition
switch
to
ON
.

5)
Press
[F],
[1]
and
[0]
on
the
select
monitor
.

6)
Read
the
select
monitor
display
.

CHECK
;
Is
theindicated
reading
between
3
.7
and
4
.1

V
when
G
sensor
is
inclined
forwards
to
90°?

Go
to
step
10AJ4
.

No
:
Replace
G
sensor
.

I10AJ4
CHECK
OUTPUT

I
SELECT
MONITOR

F
G
SENSOR
USING

Read
the
select
monitor
display
.

CHECK
:
Is
theindicated
reading
between
0
.5
and
0
.9

Vwhen
G
sensor
is
inclined
backwards
to

90°?

vES
:
Go
to
step
10AJ5
.

No
:
Replace
G
sensor
.

205