1997 SUBARU LEGACY stop start

SERVICE
PROCEDURE
[w2sDa1
4-4

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

AB
S
FUNCTION

CHECK
END

B4M1030

MODE
RESTART?

0
:
YE
S
1
:
NO

H4M
1144

10)
After
completion
of
ABS
sequence
control
.

11)
Press0key
tostart
ABS
sequence
control
again
and

press
1
key
to
end
.

3
.
CONDITIONS
FOR
COMPLETIONOF
ABS

SEQUENCE
CONTROL

When
the
following
conditions
develop,
the
ABS
sequence

control
stops
and
ABS
operation
is
returned
to
the
normal

control
mode
.

1)
When
the
speed
ofat
least
one
wheel
reaches
10
km/h

(6
MPH)
.

2)
When
terminal
No
.
3
or
No
.
6
are
separated
from
diag-

nosis
terminals
.
(When
select
monitor
is
not
used
.)

3)
When
the
brakepedal
is
released
during
sequence

control
and
the
braking
lamp
switch
is
set
to
off
.

4)
When
brake
pedal
is
depressed
afterignition
key
is

turned
to
ON,
and
before
ABS
warning
light
goes
out
.

(When
select
monitor
is
not
used
.)

5)
When
brakepedal
is
not
depressed
after
ignition
key

is
turned
to
ON,
acrd
within
0
.5
seconds
after
ABS
warn-

ing
light
goes
out
.
(When
select
monitor
is
not
used
.)

6)
After
completion
of
the
sequence
control
.

7)
When
malfunction
is
detected
.
(When
select
monitor
is

used
.)

13

4-4
[W25D4]
SERVICE
PROCEDURE

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

4
.
CONDITIONS
FORABS
SEQUENCE
CONTROL

4
km/h

Speed
of
all
wheels

HIGF
Terminal
No
.3
and
No
.6
LOV1
Operational
guide
lineofIgnition
key
switch
O
sequence
OFF

control
O
ABS
warning
light
OFF

HIGF
Stop
light
switch
LO"

HIGF
AT
ABS
signal
LOW

Valve
relay
ON

OFF

FL
outlet
valve
ON
OFF

FL
inlet
valve
O
NOFF

Operational
FR
outlet
valve
ON
OFF
pattern
of
ON
sequence
FR
inlet
valve
OFF
control
RR
outlet
valve
OFF
RR
inlet
valve
ON
OAF

RL
outlet
valve
OFF

RL
inlet
valve
ONOFF

Pump
motor
OFF

Operational
Pressure
of
master
cylinder

pressure
of
Pressure
of
FLwheel
cylinder
Pressure
of
FR
wheel
cylinder
sequence
Pressure
of
RR
wheel
cylinder
control
Pressure
of
RL
wheel
cylinder

Unit
:
second

B4M1001A
I

NOTE
:

*
When
select
monitor
is
used,
control
operation
starts
at

point
A
.
The
patterns
from
IGN
key
ON
to
the
point
A
show

that
operation
is
started
by
diagnosis
connector
.

HIGH
means
high
voltage
.

LOW
means
low
voltage
.

14

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

4-4a
[TBAO1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8
.
Diagnostics
Chart
with
Trouble
Code

by
ABS
Warning
Light

A
:
LIST
OF
TROUBLE
CODE

Trouble
code
Contents
of
diagnosis
Ref
.
to
11

Start
code

e
Trouble
code
is
shown
afterstart
code
.

*
Only
start
code
is
shown
in
normal
condition
.

-

21
Front
right
ABS
sensor
[T8B0]*10

23
Abnormal
ABS
sensor
Front
left
ABS
sensor
[T8C0]*10

25
(Open
circuit
or
input
voltage
too
high)
Rear
right
ABS
sensor
[T8D0]*10

27
Rear
left
ABS
sensor
[T8E0]x10

22
Front
right
ABS
sensor
[T8F0]*10

24
Front
left
ABS
sensor
[T8G0]dr10

26
Abnormal
ABS
sensor

(Abnormal
ABS
sensor
signal)
Rear
right
ABS
sensor
[T8H0]*10

28
Rear
left
ABS
sensor
[T810]*10

29
Any
one
of
four
[T8J0]*10

31Front
rightinlet
valve
[T8K0]*10

32
Front
right
outlet
valve
[7800]*10

33
Front
left
inlet
valve
[TSLO]*10

34
Abnormal
solenoid
valve
circuit(s)
in
Front
left
outlet
valve
[T8PO]*10

35
ABS
control
module
and
hydraulic
unit
Rear
right
inlet
valve
[T8M0]*10

36Rear
right
outlet
valve
[T8QOj*10

37
Rear
left
inlet
valve
[T8N0]x10

38Rear
left
outlet
valve
[T8R0]*10

41
Abnormal
ABS
control
module
[T8SO1*10

42
Source
voltage
is
abnormal
.
[7870]*10

44
A
combination
of
AT
control
abnormal
[T8U0]t`r10

51
Abnormal
valve
relay
[T8V0]*10

52
Abnormal
motor
and/or
motor
relay
[T8W0]*10

54
Abnormal
stop
light
switch
(78X0]*10

56
Abnormal
G
sensor
output
voltage
[T8Y0)*10

30

B2M0358
4) Slowly pour one can (16 oz) of cleaner into by-pass air
hole.
Cleaner:
Part No. 1050002 GM Top Engine Cleaner
Part No. X66-A AC Delco Carburetor Tune-up
Conditioner
5) Leave the engine running for five minutes.
NOTE:
White smoke comes out of the muffler until the cleaner is
used up.
6) Stop the engine.
B2M0359
7) Release the throttle valve.
8) Connect by-pass hose to idle air control solenoid valve.
G2M0096
9) Check duty ratio of idle air control solenoid valve with
Subaru Select Monitor.
(1) Connect Subaru Select Monitor to the data link con-
nector.
(2) Start the engine and turn Subaru Select Monitor
switch to ON.
(3) Select mode“F12”.
(4) Make sure duty ratio on radiator fan and electric
load is OFF.
Specified data: 25—40%
B2M0361
13. Pressure Sources Switching
Solenoid Valve (AT model)
A: REMOVAL AND INSTALLATION
1) Disconnect connector from pressure sources switching
solenoid valve.
2) Disconnect hoses from pressure sources switching
solenoid valve.
30
2-7SERVICE PROCEDURE
12. Idle Air Control Solenoid Valve - 13. Pressure Sources Switching Solenoid Valve (AT model)

B2M0358
4) Slowly pour one can (16 oz) of cleaner into by-pass air
hole.
Cleaner:
Part No. 1050002 GM Top Engine Cleaner
Part No. X66-A AC Delco Carburetor Tune-up
Conditioner
5) Leave the engine running for five minutes.
NOTE:
White smoke comes out of the muffler until the cleaner is
used up.
6) Stop the engine.
B2M0359
7) Release the throttle valve.
8) Connect by-pass hose to idle air control solenoid valve.
G2M0096
9) Check duty ratio of idle air control solenoid valve with
Subaru Select Monitor.
(1) Connect Subaru Select Monitor to the data link con-
nector.
(2) Start the engine and turn Subaru Select Monitor
switch to ON.
(3) Select mode“F12”.
(4) Make sure duty ratio on radiator fan and electric
load is OFF.
Specified data: 25—40%
B2M0361
13. Pressure Sources Switching
Solenoid Valve (AT model)
A: REMOVAL AND INSTALLATION
1) Disconnect connector from pressure sources switching
solenoid valve.
2) Disconnect hoses from pressure sources switching
solenoid valve.
30
2-7SERVICE PROCEDURE
12. Idle Air Control Solenoid Valve - 13. Pressure Sources Switching Solenoid Valve (AT model)

1. Clutch System
Condition Possible cause and testing Corrective action
1. Clutch slip-
pageIt is hard to perceive clutch slippage in the early stage, but pay attention to the following symptoms.
(a) Engine revs up when shifting.
(b) High speed driving is impossible; especially rapid acceleration impossible and vehicle speed does not increase in
proportion to an increase in engine speed.
(c) Power falls, particularly when ascending a slope, and there is a smell of burning of the clutch facing.
Method of testing: Put the vehicle in stationary condition with parking brake fully applied. Disengage the clutch and
shift the transmission gear into the first. Gradually allow the clutch to engage while gradually increasing the engine
speed. The clutch function is satisfactory if the engine stalls. However, the clutch is slipping if the vehicle does not
start off and the engine does not stall.
(a) No clutch pedal play Readjust.
(b) No release lever end play Readjust.
(c) Clutch facing smeared by oil Replace.
(d) Worn clutch facing Replace.
(e) Deteriorated diaphragm spring Replace.
(f ) Distorted pressure plate or flywheel Correct or replace.
(g) Defective release bearing holder Correct or replace.
(h) Defective pedal and cable system Correct or replace.
2. Clutch
drags.As a symptom of this trouble, a harsh scratching noise develops and control becomes quite difficult when shifting
gears. The symptom becomes more apparent when shifting into the first gear. However, because much trouble of the
this sort is due to defective synchronization mechanism, carry out the test as described after.
Method of testing: Refer to DIAGNOSTIC DIAGRAM on page after.
It may be judged as insufficient disengagement of clutch if any noise occurs during this test.
(a) Excessive clutch pedal play Readjust.
(b) Excessive clutch release lever play Readjust.
(c) Worn or rusty clutch disc hub spline Replace clutch disc.
(d) Excessive deflection of clutch disc facing Correct or replace.
(e) Seized crankshaft pilot needle bearing Replace.
(f ) Malfunction of pedal and cable system Correct or replace.
(g) Cracked clutch disc facing Replace.
(h) Sticked clutch disc (smeared by oil or water) Replace.
3. Clutch chat-
ters.Clutch chattering is an unpleasant vibration to the whole body when the vehicle is just started with clutch partially
engaged.
(a) Improper clutch cable routing Correct.
(b) Adhesion of oil on the facing Replace clutch disc.
(c) Weak or broken torsion spring Replace clutch disc.
(d) Defective facing contact or excessive disc Replace clutch disc defection.
(e) Warped pressure plate or flywheel Correct or replace.
(f ) Loose disc rivets Replace clutch disc.
(g) Loose engine mounting Retighten or replace mounting.
(h) Improper adjustment of pitching stopper Adjustment.
19
2-10DIAGNOSTICS
1. Clutch System

3. Transmission
A: REMOVAL
1. Open front hood fully, and support it with stay.
2. Disconnect battery ground terminal.
3. Remove air intake duct and chamber.
4. Disconnect connectors and cables.
5. Remove starter.
6. Remove pitching stopper.
AT model
7. Separate torque converter from drive plate.
8. Remove ATF level gauge.
9. Remove transmission connector bracket.
Hydraulic clutch model
10. Remove operating cylinder.
11. Set special tools.
12. Remove bolt which holds right upper side of transmission to
engine.
Hydraulic clutch model
13. Remove clutch damper.
14. Remove exhaust system.
Front exhaust pipe
Center exhaust pipe
Rear exhaust pipe [AWD]
AT model
15. Drain ATF to remove ATF drain plug.
16. Disconnect ATF cooler hose from pipe on transmission side,
and remove ATF level gauge guide.
AWD model
17. Remove propeller shaft.

A














27
2-11SERVICE PROCEDURE
3. Transmission