transmission SUBARU LEGACY 1997 Service Repair Manual

4-4
LM13-1]
BRAKES
13
.
Anti-lock
Brake
System
(ABS)
[5
.3i
Type]

13
.
Anti-lock
Brake
System
(ABS)
[5
.3i
Type]

1
.
FEATURE

*
This
ABS
5
.3i
type
incorporates
the
hydraulic
control
unit,
ABS
control
module,
valve
relay
and

motor
relay
in
one
unit
for
betterproductivity
and
lightweight
.

*
The
ABS
(Anti-lock
brake
system)
electrically
controls
brake
fluid
pressure
to
prevent
wheel

"lock"
during
braking
on
slippery
road
surfaces,
thereby
improving
directional/steering
stability
as

well
as
shortening
the
braking
distance
.

*
If
the
ABS
becomes
inoperative,
the
fail-safe
system
activates
to
ensure
it
acts
asa
conventional

brake
system
.
The
warning
light
also
comes
on
to
indicate
that
the
ABS
is
malfunctioning
.

"
The
front-and-rear
wheels
utilize
a
4-sensor,
4-channel
control
design
:
the
front
wheels
havean

independent
control
design*1
and
the
rear
wheels
have
a
select
low
control
design*2
.

*1
:
A
system
which
independently
controls
fluid
pressure
to
left
and
right
front
wheels
.

*2
:
A
system
which
provides
the
same
fluid
pressure
control
for
the
two
rear
wheels
if
either
wheel

starts
to"lock
."

10
ABS
control
moduleand
hydraulic
control
unit
(ABSCM&H/U)
Proportioning
valve
OO
Diagnosisconnector
OO
ABS
warning
light

OO
Data
link
connector
(for
SUBARU
select
monitor)
OO
Transmission
control
module
(only
AT
vehicle)
Tone
wheel

OO
ABS
sensor
09
Wheel
cylinder
O
G
sensor
(only
AWD
vehicle)
>>
Brake
switch
D
Master
cylinder

?15A

2

BRAKES
IM13-21
4-4
13
.
Anti-lock
Brake
System
(ABS)
[5
.3i
Type]

2
.
FUNCTIONS
OF
SENSORS
AND
ACTUATORS

Name
Function

ABS
control
moduleand
hydraulic
ABSCM-
e
Calculates
and
determine
the
conditionsof
the
wheels
and
body
from
control
unit
(ABSCM&H/U)
section
the
wheel
speedsand
makes
a
proper
decision
suitable
for
the
current
situation
to
control
the
hydraulic
unit
.

In
the
ABS
operation
mode,
the
module
outputs
a
cooperative
control
signal
to
the
AT
control
module
.
(AT
vehicles
only)

Whenever
the
ignition
switch
is
placed
at
ON,
the
module
makes
a
self
diagnosis
.
When
anything
wrong
is
detected,
the
module
cuts
off
the
system
.

Communicates
with
the
Subaru
select
monitor
.

H/U-section
In
the
ABS
operation
mode,
the
H/U
changes
fluid
passages
to
control

the
fluid
pressure
of
the
wheel
cylinders
in
response
to
an
instruction
from
the
ABSCM
.

The
H/U
also
constitutes
thebrake
fluid
passage
from
the
master
cylin-
der
to
the
wheel
cylinders
together
with
pipings
.

Valve
relay-
Serves
asa
power
switch
for
the
solenoid
valve
and
motor
relay
coil
in
section
response
to
an
instruction
from
the
ABSCM
.

Motor
relay-
Serves
as
a
power
switch
for
the
pump
motor
in
response
to
an
instruc-
section
tion
from
the
ABSCM
.

Wheel
speed
sensor
(ABS
sensor)
Detects
the
wheel
speed
in
terms
of
a
change
in
the
magnetic
flux
den-
sity
passingthrough
the
sensor,
converts
it
into
an
electrical
signal,
and
outputs
the
electrical
signal
to
the
ABSCM
.

Tone
wheel
Gives
a
change
in
the
magnetic
flux
density
by
the
teeth
around
the
tone
wheel
to
let
the
ABS
sensor
generate
an
electrical
signal
.

G
sensor
(AWD
vehicle
only)
Detects
a
change
in
G
in
the
longitudinal
direction
of
the
vehicle
and
outputs
it
to
the
ABSCM
in
terms
of
a
change
in
voltage
.

Stop
light
switch
Transmits
the
information
on
whether
the
brakepedal
is
depressed
or
not
to
the
ABSCM
for
use
as
a
condition
in
determining
ABS
operation
.

ABS
warning
light
Alerts
the
driver
to
an
ABS
fault
.
When
the
diagnosis
connector
and
diagnosis
terminal
are
connected,
the
light
flashes
to
indicate
a
trouble
codes
in
response
to
an
instruction
from
the
ABSCM
.

AT
control
module
(TCM)
(AT
vehicles
only)
Provides
shift
controls
(fixing
the
speed
at
3rd
or
changing
front
and
rear
wheel
transmission
characteristics
on
4WD
vehicle)
in
response
to
an
instruction
fromthe
ABSCM
.

4-4
[M13-21
BRAKES

13
.
Anti-lock
Brake
System
(ABS)
[5
.3i
Type]

O

BATTERY

B4H1216A

O
ABS
control
module
and
S
Front
right
outlet
solenoidvalve
D
ABS
warning
light
hydraulic
control
unit
(2
Rear
left
inlet
solenoid
valve'
0
Stop
light
switch
9
ABS
control
module
section
D
Rear
left
outlet
solenoidvalve
0
Stop
light
Valve
relay
0
Rear
right
inlet
solenoidvalve
(5
G
sensor
(only
AWD
model)
O
Motor
relay
8
Rear
right
outlet
solenoid
valve
0
Front
left
ABS
sensor
m
Motor
R
Transmission
control
module
Z
Front
right
ABS
sensor
Front
left
inlet
solenoid
valve
(only
AT
module)
Z
Rear
left
ABS
sensor
8
Front
left
outlet
solenoidvalve
(3
Diagnosis
connector
(8
Rear
right
ABS
sensor
Front
right
inlet
solenoidvalve
0
Data
link
connector

TABLE
OFCONTENTS

2-1
~************

2-2
*********~k**

2-3
tE**tE*ylr****t1~~t

2-3b
*******tlr~~ylr**

2-4
~t~~t~t1E7E~t~lr~lr~t~t~t~t

2-5
*yt***********
ENGINE
SECTION
2-6
*~~**********

2-7
*************

2-8
*****yt**ytyt*~*

2-9
*******~t*~*~*

2-10
**It~**yt**~*yt*

2-11
**~**********

3-1
**~t******~k*yt*

TRANSMISSION
AND
DIFFERENTIAL
3'2
**********'k**

SECTION
3-3
tf*~yt*yt*ytyt~t*yt~t

3-4
*yttt~*~~******

4-1
~t***~~~yt~k*~~*

4-2
~t*~t~**yttt***~k*

4-3
~**~k**~**~~~~

MECHANICAL
COMPONENTS
4-4
Brakes
SECTION

4-5
**~t~t~t~~~t**~~r*

4-6
*************

4-7
*tt**7f~*~k*****

5-1
*******~*****

5-2
*************

5-3
***********ytyt
BODY
SECTION
5-4
*skateboards*
с*

5-5
y1r*******~****

5-5b
**~t**********

6-1
**~~****yt****
ELECTRICAL
SECTION
6-2
~****~t**~t**1f~

All
right
reserved
.
This
book
may
not
bereproduced

or
copied,
in
whole
or
in
part,
withoutthe
written

permission
of
FUJI
HEAVY
INDUSTRIES
LTD
.,

TOKYO
JAPAN
.

SUBARU,
++
and
O
are
trademarks
of

FUJI
HEAVY
INDUSTRIES
LTD
.

@
Copyright
1996
FUJI
HEAVY
INDUSTRIES
LTD
.

2

4-4
[w2sBO]
SERVICE
PROCEDURE

25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]

B
:
INSPECTION

i
Mark

>
ABSCM&H/U
B4M
1248A

/Pressure
ga
u
ge
\
'
/\

B4M0633A

1)
Check
connected
and
fixed
condition
of
connector
.

2)
Check
specifications
of
the
mark
with
ABSCM&H/U
.

Mark
Model

C3
AWD
AT

C4
AWD
MT

C
:
CHECKING
THE
HYDRAULIC
UNIT
ABS

OPERATION

1
.
CHECKINGTHE
HYDRAULIC
UNIT
ABS
OPERATION

BY
PRESSURE
GAUGE

1)
Lift-up
vehicle
and
remove
wheels
.

2)
Disconnect
the
air
bleeder
screwsfrom
the
FL
andFR

caliper
bodies
.

3)
Connect
two
pressure
gauges
to
the
FL
andFR
cali-

perbodies
.

CAUTION
:

Pressure
gauges
used
exclusively
for
brake
fluid

must
be
used
.

e
Do
not
employ
pressure
gauge
previously
used
for

transmission
since
the
piston
seal
is
expanded
which

may
lead
to
malfunction
of
the
brake
.

NOTE
:

Wrap
sealing
tape
around
the
pressure
gauge
.

8

4-4d
[Taoo1
BRAKES
[ABS
5
.31
TYPE]

3
.
Electrical
Components
Location

3
.
Electrical
Components
Location

84M
1225A

ABS
control
module
and
hydraulic
control
unit

(ABSCM&H/U)
~2
Proportioning
valve

03
Diagnosisconnector

~4
ABS
warning
light

~5
Data
link
connector
(for
Subaru
select
monitor)

~6
Transmission
control
module
(only
AT
vehicle)

Tone
wheel

%
ABS
sensor

Wheel
cylinder

(*
G
sensor
(only
AWD
vehicle)

~t
Brake
switch

#
Master
cylinder

4

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

4
.
Schematic

4
.
Schematic

10

14

BATTERY
16

-----I

---
IGN

17
----I

=
O_
.__J

C5
19

U6

--
-
------
H
!
20

-----------
g

10

1
-
~
11

----------
----
r
12
23
`
"
...
.,`
@
.

Twisted
w
ire

B
4M1227A

ABS
control
module
and
hydraulic
control
unit

(ABSCM&H/U)

~2
ABS
control
module
area

~3
Valve
relay

~a
Motor
relay

~5
Motor

06
Front
left
inlet
solenoid
valve

07
Front
left
outlet
solenoid
valve

~8
Front
right
inlet
solenoid
valve

Front
right
outlet
solenoid
valve
~o
Rear
left
inlet
solenoid
valve

Rear
left
outlet
solenoid
valve

g
Rear
right
inlet
solenoid
valve

Rear
right
outlet
solenoid
valve

~a
Transmission
control
module
(only
AT
model)

~5
Diagnosis
connector

~s
Data
link
connector

ABS
warning
light

Qe
Stop
light
switch

Stop
light

~o
G
sensor
(only
AWD
model)

Front
left
ABS
sensor

~2
Front
right
ABS
sensor

Rear
left
ABS
sensor

Rear
right
ABS
sensor

6

4-4d
[rsuo1
BRAKES
[ABS
5
.3i
TYPE]

8
.
DiagnosticsChart
with
Trouble
Code
by
ABS
Warning
Light

U
:
TROUBLE
CODE
44

-
A
COMBINATION
OF
AT
CONTROL

ABNORMAL
-

DIAGNOSIS
:

a
Combination
of
AT
control
faults

TROUBLE
SYMPTOM
:

e
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit
ILE

Fuse
IGN
sw
SBF-4
FL]
.25B

No
.16

F45
B62
B54

m

O
JE

Transmission
control
module

X100
B56

854
B55856

1
3
4
6
P11213149
1
49
10
1
11
11
141
1
11
211311411
tl
1611
/11

F49

123456789101112131415
2122
23
242
5
26
617W031
2171
8
2

8100

f45

'1
14
1

B4M
1247

70

4-4d
[T1oYO]
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
44
(FBI)

CCM
LINE

B4M0964

Y
:
TROUBLE
CODE
44
CCM
LINE

-
A
COMBINATION
OF
AT
CONTROL

ABNORMALS
-

DIAGNOSIS
:

9
Combination
of
AT
control
faults

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

Fuse
IGN
sw
SBF-4
FL1
.25B

No
.
16

f45B61B54

m

JE
O

~--I
1
1
Transmission
control
module

3100
B56

834855B56

1
44
1
4
910
1/16191
1
011
1
1121
191101
1
11121131141
1A

F49

123456789101112131415

16Y8"2
1819
ZO2
1
2324
5
2627
9
30
31

8100

f45

1
10

B4M1247

158

4-4d
[T1
0Z0]
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
44
(FBI)

CCM
OPEN

B4M0965

Z
:
TROUBLE
CODE
44
CCM
OPEN

-
A
COMBINATIONOF
AT
CONTROL

ABNORMALS
-

DIAGNOSIS
:

9
Combination
of
AT
control
faults

TROUBLE
SYMPTOM
:

9
ABS
does
notoperate
.

WIRING
DIAGRAM
:

Fuse
IGN-1sw
SBF-4
FL1
.258

F49

ABS
control
module
and
hydraulic
control
unit

No
.
16

J

Ei

E

Transmission
control
module

3D100

P1
1213149161
1213141bl6l/lb
1
/1
b19liull
11121
19110111114131141A
glIZ11311411511611
/JIM

(~D

r--l
112131415161718191101llll2ll-3Fl4Tl-51

q

11611711811912012122
23
24
25
26
27
1
28
1
29
1
30
1
31
1

8100

F45

4=1
1161718-19
21131
1
41
1
10

B4M1247
I

162