SUBARU LEGACY 1997 Service Service Manual

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

6
.
Diagnostics
Chart
for
On-board
Diagnosis
System

B
:
CHECK
LIST
FOR
INTERVIEW

Check
the
following
items
about
the
vehicle's
state
.

1
.
THE
STATE
OF
THE
ABS
WARNING
LIGHT

ABS
warning
light
O
Always

comes
on
.
D
Sometimes

O
Onlyonce

O
Does
not
come
on
o
When
/how
long
does
it
come
on?
:

Ignition
key
position
O
LOCK

D
ACC

OON
(before
starting
engine)

D
START

O
On
afterstarting
(Engine
is
running)

O
On
after
starting
(Engine
is
stop)

Timing
O
Immediately
afterignition
is
ON
.
O
Immediately
after
ignition
starts
.

O
When
advancing
km/h
to
km/h

MPH
to
MPH

D
While
traveling
at
a
constant
speed
km/h
MPH

D
When
decelerating
km/h
to
km/h

MPH
to
MPH
OWhen
turning
to
right
Steering
angle
:
deg

Steering
time
:
sec

D
When
turning
to
left
Steering
angle
:
deg

Steering
time
:
sec

D
When
moving
other
electrical
parts
Parts
name
Operating
condition

2
.
SYMPTOMS

ABS
operating
D
Performsno
work
.

condition
D
Operates
only
when
abruptly
applying
brakes
.
Vehicle
speed
:
km/h

MPH

~
How
to
step
on
brake
pedal

a)
Operating
time
:
sec

b)
Operating
noise
:
O
Produce
/
D
Does
not
produce

oWhat
kind
of
noise?
O
Knock

O
Gong
gong

D
Bong

a
Buzz

D
Gong
gong
buzz

O
Others

c)
Reaction
force
of
brake
pedal

O
Stick
O
Press
down
once
with
a
clunk

O
Press
and
released

D
Others

12

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

6
.
DiagnosticsChart
for
On-board
Diagnosis
System

Behavior
of
vehicle
a)
Directional
stability
cannotbe
obtained
or
steering
arm
refuses
to
work
when
applying
brakes

O
Yes
/
ONo

When
:
D
Vehicle
turns
to
right

o
Vehicle
turns
to
left

D
Spins

D
Others

b)
Directional
stability
cannot
be
obtained
orsteering
arm
refuses
to
work
when
accelerating

O
Yes
/
O
No

When
:
O
Vehicle
turns
to
right

O
Vehicle
turns
to
left

D
Spins

O
Others

c)
Brakes
areout
of
order
:
O
Yes
/
ONo

What
:
O
Braking
distance
is
long

O
Brakes
lockor
drag

D
Pedal
stroke
is
long

D
Pedal
sticks

O
Others

d)
Poor
acceleration
:
D
Yes
/
ONo

What
:
D
Fails
to
accelerate

o
Engine
stalls

o
Others

e)
Occurrence
of
vibration
:
D
Yes
/
[]No

Where
What
kind

f)
Occurrence
of
abnormal
noise
:
O
Yes
/
DNo

Where

What
kind

g)
Occurrence
of
other
phenomena
:
D
Yes
/
ONo

What
kind
3
.
CONDITIONS
UNDER
WHICH
TROUBLE
OCCURS

Environment
a)
Weather
D
Fine

O
Cloudy

O
Rainy

D
Snowy

O
Various/Others

b)
Ambient
temperature
F(°C)

c)
Road
D
Urban
area

D
Suburbs

O
Highway

O
General
road

D
Ascending
slope

O
Descending
slope

O
Paved
road

O
Gavel
road

O
Muddy
road

O
Sandy
place

Cl
Others

d)
Road
surface
D
Dry

D
Wet

O
New-fallen
snow

O
Compressed
snow

O
Frozen
slope

O
Others

13

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

6
.
Diagnostics
Chart
for
On-board
Diagnosis
System

Condition
a)
Brakes
Deceleration
:
g

O
Continuous
/
Olntermittent

b)
AcceleratorAcceleration
:
g

O
Continuous
/
O
Intermittent

c)
Vehicle
speed
km/h
MPH

O
Advancing

O
Accelerating

O
Reducing
speed

O
Low
speed

O
Turning

D
Others

d)
Tire
inflation
pressure
Front
RH
tire
:
kPa

Front
LH
tire
:
kPa

Rear
RH
tire
:
kPa

Rear
LH
tire
:
kPa

e)
Degree
of
wear
Front
RH
tire

Front
LH
tire

Rear
RH
tire

Rear
LH
tire

f)
Genuine
parts
are
used
.:
Yes
/
ONo

g)
Chain
is
passed
around
tires
.:
Yes
/
DNo

h)
T
tire
is
used
.:
Yes
/
ONo

i)
Condition
of
suspension
alignment

j)
Loading
state

k)
Repair
parts
are
used
.
:
OYes
/
ONo

What

I)
Others

14

BRAKES
[ABS
5
.31
TYPE]
[T6D1]4-4d

6
.
Diagnostics
Chart
for
On-board
Diagnosis
System

Diagnosisconnector
--J

-\
o

o

Diagnosis
terminals
3
terminal
6
terminal
/

B4M0082D

C
:
INSPECTION
MODE

Reproduce
thecondition
underwhich
the
problem
has

occurred
as
much
as
possible
.

Drive
the
vehicle
at
a
speed
more
than40
km/h
(25
MPH)

forat
least
one
minute
.

D
:
TROUBLE
CODES

When
on-board
diagnosis
of
the
ABS
control
module

detects
a
problem,
the
information
(up
to
a
maximum
of

three)
will
be
stored
in
the
EEP
ROM
asa
trouble
code
.

When
there
are
more
than
three,
the
most
recent
three
will

be
stored
.
(Stored
codes
will
stay
in
memory
until
they
are

cleared
.)

1
.
CALLING
UP
A
TROUBLE
CODE

1)
Take
out
diagnosis
connector
from
side
ofdriver's
seat

heater
unit
.

2)
Turn
ignition
switch
OFF
.

3)
Connect
diagnosis
connector
terminal
6
to
diagnosis

terminal
.

4)
Turn
ignition
switch
ON
.

5)
ABS
warning
light
is
set
in
the
diagnostic
mode
and

blinks
toidentify
trouble
code
.

6)
After
the
start
code
(11)
is
shown,
the
trouble
codes
will

be
shown
in
order
of
the
last
information
first
.

These
repeat
for
a
maximum
of
5
minutes
.

NOTE
:

When
there
are
no
trouble
codes
in
memory,
only
the
start

code
(11)
is
shown
.

Example
of
code
indication

Trouble
code
:
21

ON
111
1
2
1
1
2

OFF
~'2
sec

1
.0s

ec
1
.2
sec
1.2
sec
1
.0
sec
U
~~
U
U
L
.-J

0
.3
sec
0
.3
sec
0
.3
sec

Start
code
Trouble
code
21
Start
code
Trouble
code
21

Trouble
code
:
22,
31

ON
1
1
22
3
1
11

OFF

Start
code
Trouble
code
22
Trouble
code
31Start
code
B4M0232A

15

4-4d[T6D2]
BRAKES
[ABS
5
.3i
TYPE]

6
.
Diagnostics
Chart
for
On-board
Diagnosis
System

Diagnosis
connector
-J

_
~\~
°°

Diagnosis
terminals
3
terminal
6
terminal
/

84M00820

2
.
CLEARING
MEMORY

1)
After
calling
up
a
trouble
code,disconnect
diagnosis

connector
terminal
6from
diagnosis
terminal
.

2)
Repeat
3
times
within
approx
.
12
seconds
;
connecting

and
disconnecting
terminal
6
and
diagnosis
terminal
for

at
least
0
.05
seconds
each
time
.

Trouble
code
indication
mode
Memory
erase
mode

ABS
warning
lamp

GND
(Low
level)
U
U
GND
open
(High
level)

Terminal
6
Ad
.1
.4
1.5
sec
0
.2
sec
or
more
0
.05
sec
or
more

12sec
or
less

B4M0233D

NOTE
:

After
diagnostics
is
completed,
make
sure
to
clear
mem-

ory
.
Make
sureonly
start
code
(11)
is
shown
after
mem-

ory
is
cleared
.

16

4-4d
R7ao1
BRAKES
[ABS
5
.3i
TYPE]

7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

7
.
Diagnostics
Chart
for
ABS
Warning

Light
Circuit
and
Diagnosis
Circuit

Failure

A
:
ABS
WARNING
LIGHT
DOES
NOT
COME

ON
.

DIAGNOSIS
:

e
ABS
warning
light
circuit
is
open
or
shorted
.

TROUBLE
SYMPTOM
:

e
When
ignition
switch
is
turned
ON
(engine
OFF),
ABS

warning
light
does
not
come
on
.

WIRING
DIAGRAM
:

Fuse

No
.
12

Fuse

F49
f2
B100

ABS
control
module
and
hydraulic
control
unit

c
:
i14
No
.15

L
ABS

Combination
meter

881
0
Diagnosis
°
E
connector

Diagnosis
terminal

IGNsw
SBF-4
FL1.25B

Fuse
SBF-3

No
.19

882
8100

01
11
12
11
1
1
ID
M
131415161

i2
1
4
10
11
1
13141
1

i14

1
11
11

f49

123456789101112131415
16171819
20
2122
23
24252627
1
28
1
29
1
30
13
11

rw
am

84M1230

18

BRAKES
[ABS
5
.31
TYPE]
[T7A3]
4-4d

7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

B1
2345
678910
1112
1
13
1
14
1
15
1
16
1
17
1
18
1
19
.
)

D

V

-
B4M1273A

I7A1
ICHONECK
IF
OTHER
WARNING
LIGHTS
TURN

Turn
ignition
switch
to
ON
(engine
OFF)
.

CHECK
:
Do
other
warning
lights
turn
on?

,rES
:
Go
to
step
7A2
.

No
:
Repair
combination
meter
.

7A2
I
CHECK
ABS
WARNING
LIGHT
BULB
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
combination
meter
.

3)
Remove
ABS
warning
light
bulb
from
combination

meter
.

CHECK
:
Is
ABS
warning
light
bulb
OK?

,mss
:
Go
to
step
7A3
.

No
:
Replace
ABS
warning
light
bulb
.

7A3
CHECK
BATTERY

NG
LIGHT
HARNESS

SHO
RT
OF
ABS
WARN-

1)
Disconnect
connector
(B100)
from
connector
(F2)
.

2)
Measure
voltage
between
connector
(B100)
and
chas-

sis
ground
.

Connector
&
terminal
(B100)
No
.
9
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
thevoltage
less
than
3
V?

vES
:
Go
to
step
7A4
.

No
:
Repair
warning
light
harness
.

19

4-4d
[r7aa1
BRAKES
[ABS
5
.31
TYPE]

7
.
DiagnosticsChart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

2345
67890
B1~
1
11
1
12
1
13
1
14
1516
171819
1:
)

D

84M1273A

7A4
CHECK
BATTERY

NG
LIGHT
HARN

SSORT
OF
ABS
WARN-

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
connector
(B100)
and
chas-

sis
ground
.

Connector
&
terminal

(8100)
No
.
9
(+)
-
Chassis
ground
(
)
:

CHECK
:
is
voltage
less
than3
V?

YES
:
Go
to
step
7A5
.

No
:
Repair
warning
light
harness
.

7A5
CHECK
WIRING
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Install
ABS
warning
light
bulb
from
combination
meter
.

3)
Install
combination
meter
.

4)
Turn
ignition
switch
to
ON
.

5)
Measure
voltage
between
connector
(B100)
and
chas-

sis
ground
.

Connector
&
terminal

(B100)
No
.
9
(+)
-
Chassis
ground
(-)
:

CHECK
:
Is
voltage
between
10
V
and
15
V?

,rES
:
Go
to
step
7A6
.

No
:
Repair
wiring
harness
.

20

BRAKES
[ABS
5
.31
TYPE]
[r7Aal
4-4d

7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

F49

1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
9h0
1
11
1
12
1
13
1
1
411
516
1
17
1
18
1
19
1
20
2
1
23
24
2526
728293031

D

-_
B4M
1243A

7A6
CHECK
BATTERY

NG
LIGHT
HARN

SSORT
OF
ABS
WARN-

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
voltage
between
connector
(F2)
and
chassis

ground
.

Connector
&
terminal

(F2)
No
.
9
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
thevoltage
less
than3
V?

,rES
:
Go
to
step
7A7
.

No
:
Repair
wiring
harness
.

7A7

CHECK
BATTERY

(
NG
LIGHT
HARNESS
.

SHO
RT
OF
ABSWARN-

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
connector
(F2)
and
chassis

ground
.

Connector
&
terminal

(F2)
No
.
9
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
voltage
less
than3
V?

vES
:
Go
to
step
7A8
.

No
:
Repair
wiring
harness
.

7A8
CHECK
GROUND
CIRCUIT
OF
ABSCM&H/U
.

Measure
resistance
between
ABSCM&H/U
and
chassis

ground
.

Connector
&
terminal

(F49)
No
.
23
-
GND
:

CHECK
:
Is
theresistance
less
than0
.5
92?

,rES
:
Go
to
step
7A9
.

No
:
Repair
ABSCM&H/U
ground
harness
.

21

4-4d
[r7A9]
BRAKES
[ABS
5
.3i
TYPE]

7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

7A9
CHECK
WIRING
HARNESS
.

Measure
resistance
between
connector
(F2)
and
chassis

ground
.

Connector
&
terminal

(F2)
No
.
9
-
Chassis
ground
:

CHECK
;
Is
the
resistance
less
than0
.5
11?

YES
:
Go
to
step
7A10
.

No
:
Repair
harness/connector
.

7A10
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switchto
OFF
.

CHECK
:
Is
there
poor
contact
in
connectors
between

combination
meter
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10
>

ves
:
Repair
connector
.

No
:
Replace
ABSCM&HIU
.

22