1997 SUBARU LEGACY 4WD

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
.

4-4d[T9B0]
BRAKES
[ABS
5
.31
TYPE]

9
.
Select
Monitor
Function
Mode

1997
(F00)

AB
S
4WD
"
AT

H4M1117

B
:
MODE
F00

-
ROM
ID
NUMBER
(ROM)
-

CONDITION
:

Ignition
switch
ON

SPECIFIED
DATA
:

Presentation
display

911311
CHECK
MESSAGE
OF
DISPLAY
.

CHECK
;
Does
display
indicate
message
"Error
I"?

Repair
loose
or
disconnect
connector,
or
discon-

tinued
circuit
in
data
linkcircuit
.

No
:
Go
to
step
982
.

FR
(F05)

30
km/h

B4M0922

191132
I
CHECK
MESSAGE
OF
DISPLAY
.

CHECK
:
Does
display
indicate
message
"Error
2"?

YES
:
Repair
poor
contact
of
select
monitor
cartridge,

or
installation
of
different
type
select
monitor
car-

tridge
.

No
:
Data
link
system
is
normal
.

C
:
MODE
F01
AND
F05

-
FRONT
RIGHT
WHEEL
SPEED
SIGNAL

(FR)
-

Compare
speedometer
with
monitor
indications
.

"
F01
:
FR
wheelspeed
is
indicated
in
mile
per
hour
(mile/

h)
.

*
F05
:
FR
wheel
speed
is
indicated
in
kilometerper
hour

(km/h)
.

NOTE
:

The
monitoras
shown,
indicates
that
FR
wheel
speed
is

30
km/h
.

94

BRAKES
[ABS
5
.31
TYPE]
[T10Y3]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

1997
(F00)

AB
S
4WD
"
AT

H4M
1117'

B56

110191817
1
6
5
43
2
1
0
1
91
1
0
1
71
1
1
4i
1
1211

0
L
V

84M
1251
A

1
CHECK

I
USING
SELECT
.

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

2)
Read
the
select
monitor
display
.

CHECK
:
Is
an
ABSCM&HI
U
for
AT
model
installed
on

a
MT
model?

vES
:
Replace
ABSCM&H/U
.

No
:
Go
tostep
10Y2
.
1
10Y2
I
CHECK
GROUND
SHORT
OF
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
two
connectors
from
TCM
.

3)
Disconnect
connector
from
ABSCM&H/U
.

4)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
3
-
Chassis
ground
:

CHECK
:
Is
the
resistance
more
than
1
1140?

,rES
:
Go
to
step
10Y3
.

No
:
Repair
harness
between
TCM
and
ABSCM&H/U
.

10Y3
CHECK
TCM
.

1)
Connect
all
connectors
to
TCM
.

2)
Turn
ignition
switch
to
ON
.

3)
Measure
voltage
between
TCM
connector
terminal
and

chassis
ground
.

Connector
&
terminal

(B55)
No
.
5
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

Go
to
step
10Y5
.

No
:
Go
tostep
10Y4
.

159

BRAKES
[ABS
5
.31
TYPE]
[T10AG5]
4-4d

10
.
DiagnosticsChart
with
Select
Monitor

1997
(F00)

ABS
4WD
"
AT

H4M
11171

G-SENS
(F
10)

2
.30
V

sannos271

10AG1
HECK
I
US
G
SE
ECT,MONT
OR

OF
ABSCM&H/U

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

2)
Read
the
select
monitor
display
.

CH~K
:
Is
an
ABSCM&HlU
for
4WD
model
installed

on
a
FWD
model?

Replace
ABSCM&H/U
.

No
:
Go
to
step
10AG2
.

I10AG2
CHECK
OUTPUT

I
SELECT
MONITOR

F
G
SENSOR
USING

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

2)
Read
the
select
monitor
display
.

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

V
when
the
G
sensor
is
in
horizontal
posi-

tion?

,rE$
:
Go
to
step
10AG3
.

Go
to
step
10AG6
.
I
10AG3
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connector
between

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

WORD
[T3C1]
.*10
>

Repair
connector
.

No
:
Go
tostep
10AG4
.

10AG4
CHECK
ABSCM&HlU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

c
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

Replace
ABSCM&H1U
.

No
:
Go
to
step
i0AG5
.

10AG5
CHECK
ANY
I
APPEARANCE

.THER
TROUBLE
CODES

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
withthe
diagnosis
corresponding
to
the

trouble
code
.

A
temporary
poor
contact
.

187

G4M0538
7) Models equipped with rear disc brakes:
Remove union bolt from brake caliper.
8) Models equipped with rear drum brakes:
Disconnect brake hose from brake pipe from strut, and
disconnect brake pipe from dram brake.
G4M0539
9) Remove bolts which secure rear strut to housing.
10) Remove nuts securing strut mount to body.
11) Remove strut mount cap.
B: DISASSEMBLY
For disassembly of rear strut, refer to procedures outlined
under front strut as a guide.

C: INSPECTION
Refer to Front Strut [W4C0] as a guide for inspection pro-
cedures.
G4M0540
D: ASSEMBLY
Refer to Front Strut [W4D0] as a guide for assembly pro-
cedures.
CAUTION:

Install rear strut with “FWD” or “4WD” mark on strut
mount facing outside of vehicle body.

Insert the protrusion of lower rubber seat into the
strut spring seat hole.
41
4-1SERVICE PROCEDURE
9. Rear Strut

51. READ DATA FUNCTION KEY LIST FOR AT
Function mode Contents Abbr. Unit
F00 Mode display E-4AT—
F01 Battery voltage VB V
F02 Vehicle speed sensor 1 signal VSP1 m/h
F03 Vehicle speed sensor 1 signal VSP1 km/h
F04 Vehicle speed sensor 2 signal VSP2 m/h
F05 Vehicle speed sensor 2 signal VSP2 km/h
F06 Engine speed EREV rpm
F07 ATF temperature sensor signal ATFT deg F
F08 ATF temperature sensor signal ATFT deg C
F09 Throttle position sensor signal THV V
F10 Gear position GEAR—
F11 Line pressure duty ratio PLDTY %
F12 Lock-up duty ratio LUDTY %
F13 AWD duty ratio 4WDTY %
F14 Throttle position sensor power supply voltage THVCC V
F15 Mass air flow sensor signal AFM V
58
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

G3M0730
59. FUNCTION MODE: F10
—GEAR POSITION (GEAR)—
G3M0731
60. FUNCTION MODE: F11
—LINE PRESSURE DUTY RATIO (PLDTY)—
G3M0732
61. FUNCTION MODE: F12
—LOCK-UP DUTY RATIO (LUDTY)—
G3M0733
62. FUNCTION MODE: F13
—AWD DUTY RATIO (4WDTY)—
B3M0259
63. FUNCTION MODE: F14
—THROTTLE POSITION SENSOR POWER SUPPLY
VOLTAGE (THVCC)—
61
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

D: LIST OF TROUBLE CODE
1. TROUBLE CODE
Trouble code Item Content of diagnosisAbbr.
(Select monitor)Page
11 Duty solenoid ADetects open or shorted drive
circuit, as well as valve seizure.PLDTY 16
12 Duty solenoid BDetects open or shorted drive
circuit, as well as valve seizure.LUDTY 20
13 Shift solenoid 3Detects open or shorted drive
circuit, as well as valve seizure.OVR 24
14 Shift solenoid 2Detects open or shorted drive
circuit, as well as valve seizure.SFT2 26
15 Shift solenoid 1Detects open or shorted drive
circuit, as well as valve seizure.SFT1 28
21 ATF temperature sensorDetects open or shorted input
signal circuit.ATFT 30
22 Mass air flow signalDetects open or shorted input
signal circuit.AFM 33
23 Engine speed signalDetects open or shorted input
signal circuit.EREV 35
24 Duty solenoid CDetects open or shorted drive
circuit, as well as valve seizure.4WDTY 37
25 Torque control signalDetects open or shorted input
signal circuit.TQ.CT 39
31 Throttle position sensorDetects open or shorted input
signal circuit.THV 41
32 Vehicle speed sensor 1Detects open or shorted input
signal circuit.VSP1 44
33 Vehicle speed sensor 2Detects open or shorted input
signal circuit.VSP2 48
14
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
6. Diagnostic Chart for On-board Diagnostic System