ECO mode SUBARU LEGACY 1997 Service Repair Manual

SERVICE
PROCEDURE
[W25D21
4-4

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

Diagnosis
connector
--J

1

I`

--~
~
''-
Diagnosis
terminals

3
terminal
6
terminal
-
/

B4M0082D
D
:
ABS
SEQUENCE
CONTROL

1)
Under
the
ABS
sequence
control,
after
thehydraulic

unit
solenoid
valve
is
driven,
theoperation
of
thehydrau-

lic
unit
can
be
checked
by
means
of
the
brake
tester
or

pressure
gauge
.

2)
ABS
sequence
control
can
be
started
by
diagnosis

connector
or
select
monitor
.

1
.
OPERATIONAL
GUIDELINES
OF
THE
ABS

SEQUENCE
CONTROL
WITH
DIAGNOSIS
CONNECTOR

1)
Connect
diagnosis
terminals
to
terminals
No
.
3
andNo
.

6
of
the
diagnosis
connector
beside
driver's
seat
heater

unit
.

2)
Setthe
speed
of
all
wheels
at
4
km/h
(2
MPH)
or
less
.

3)
Turn
ignition
switch
OFF
.

4)
Within
0
.5
seconds
after
the
ABS
warning
light
goes

out,
depress
the
brake
pedal
and
hold
it
immediately
after

ignition
switch
is
turned
to
ON
.

CAUTION
:

Do
not
depress
the
clutch
pedal
.

NOTE
:

*
When
the
ignition
switch
is
setto
on,the
brake
pedal

must
not
be
depressed
.

Engine
must
not
operate
.

5)
After
completion
of
ABS
sequence
control,
turn
ignition

switch
OFF
.

2
.
OPERATIONAL
GUIDELINES
OF
THE
ABS

SEQUENCE
CONTROL
WITH
SELECT
MONITOR

NOTE
:

In
the
event
of
any
trouble,
the
sequence
control
may
not

be
operative
.
In
such
a
case,
activate
the
sequence

control,
referring
to
"OPERATIONAL
GUIDELINES
OF
THE

ABS
SEQUENCE
CONTROL
WITHDIAGNOSIS
CONNEC-

TOR
"
.
<
Ref
.
to
4-4
[W25D1],*10>

1)
Connect
select
monitor
to
data
link
connector
beside

driver's
seat
heater
unit
.

2)
Turn
ignition
switch
ON
.

3)
Put
select
monitor
to
ABS
mode
.

11

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

BRAKES
[ABS
5
.31
TYPE]
'
[T501]
4-4d

5
.
Control
Module
I/O
Signal

Terminal

N
Input/Output
signal
Contents
o
.

_)
Measured
value
andmeasuring
conditions

ABS
Front
left
wheel
9-10

sensor'2
Front
right
wheel
11-12
0
.12
-
1
V
(Wheel

speed
Rear
left
wheel
7-8
(When
it
is
20Hz
.)

sensor)
Rear
right
wheel
14-15

Valve
relay
power
supply
24-23
10
-
15
Vwhen
ignition
switch
is
ON
.

Motor
relay
power
supply
25-23
10
-
15
Vwhen
ignition
switch
is
ON
.

G
sensor'2
Power
supply
30-28
4
.75
-
5
.25
V

(AWD
model
ground
28
-

only)
output
6-28
2
.3f0
.2
V
when
vehicle
isin
horizontal
position
.

Stop
light
switch*1
2-23
Less
than
1
.5
V
when
the
stop
light
is
OFF
and,10
-
15
V

when
thestop
light
is
ON
.

ABS
warning
light`2
21-23
Less
than
1.5
V
during
1
.5
seconds
when
ignition
switch
is

ON,and
10
-
15
V
after
1.5
seconds
.

AT
ABS
signal'2

(AT
model
only)
31-23
Less
than
1
.5
V
when
the
ABS
control
does
not
operate
still

and
more
than5
.5
V
when
ABS
operates
.

ABS
operation
signal
monitor*2
3--23
Less
than
1
.5
V
when
the
ABS
control
does
not
operate
still

and
more
than5
.5
V
when
ABS
operates
.

Select
Data
is
received
.
20-23
Less
than
1
.5
V
when
no
data
is
received
.

monitor'2
Data
is
sent
.
5--23
4
.75
-
5
.25
V
when
no
data
is
sent
.

ABS
Terminal
No
.
3
29-23
10
-
15
V
when
ignition
switch
is
ON
.
diagnosis

connector*2
Terminal
No
.
6
4-23
10
-
15
V
when
ignition
switch
is
ON
.

Power
supply'1
1-23
10
-
15
V
when
ignition
switch
is
ON
.

Grounding
line
23
-

Grounding
line
~26

*1
:
Measure
the
I/O
signal
voltage
after
removing
the
connector
from
the
ABSCM&H/U
terminal
.
'2
:
Measure
the
I/O
signal
voltage
at
connector
(F2)
or
(Fi)
.

9

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

6
.
Diagnostics
Chart
for
On-board
Diagnosis
System

I
TROUBLE
OCCURS
.I

Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.

Ask
the
customer
when
and
how
the
trouble
occurred
using
interview
check
list
.

6
.
Diagnostics
Chart
for
On-board

Diagnosis
System

A
:
BASIC
DIAGNOSTICS
PROCEDURE

I
PRE-INSPECTION
I

I
CALLING
UPA
TROUBLE
CODE
.
I

No
trouble
code
is
readable
.
Inspection
using
Diagnostic
Chart
for
Warning
Light
Failure
.

Record
all
trouble
codes
.
Only
the
start
code
is
issued
.

Trouble
codes
are
issued
.

Perform
diagnostics
in
accordance
with
trouble
code
.

Trouble
code
I
Repair
.
designated
.

Clear
memory
.

I
INSPECTION
MODE
I

I
CALLING
UPA
TROUBLE
CODE
.

Only
the
star
t
code
is
issued
.

CONFIRMATION
TEST

END

Inspection
using
General
Diagnostics
chart
.

B4M
1051
A

CAUTION
:

Remove
foreign
matter
(dust,
water,
etc
.)
from
the

ABSCM&H/U
connector
during
removal
and
installation
.

NOTE
:

e
To
check
harness
for
broken
wires
or
short
circuits,

shake
it
while
holding
it
or
the
connector
.

*
When
ABS
warning
light
illuminates,
read
and
record

trouble
code
indicated
by
ABS
warning
light
.

11

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

BRAKES
[ABS
5
.31
TYPE]
[T9A3]
4-4d

9
.
Select
Monitor
Function
Mode

2
.
FA
MODE
(ON/OFF
DATA
ARE
DISPLAYED
.)

Function
code
M
it
i
b
i
C
l
Code
Abbreviation
easur
ng
ems
ontents
to
e
mon
toredScrol
Ref
.
to

131
Stop
light
switch
LED
1
comes
on
withthe
switch
on
(with
the

brake
pedal
down)
.

VR
Valve
relay
signal
LED
2
comes
on
withthevalverelay
off
.

MR
Motor
relay
signal
LED
3
comes
on
with
the
motor
on
.

FAO
ATAT
ABS
signal
LED
4
comesonwhen
ABS
control
is
on
.
Possible
[T910]*10

AW
ABS
warning
light
LED
6
comes
on
when
the
warning
light
is
on
.

VM
Valve
relay
monitor
LED
1
comes
on
with
thevalverelay
off
.

MM
Motor
relay
monitor
LED
8
comes
on
when
the
motor
relay
is
on
.

CM
CCM
signal
LED
9
comes
on
when
ABS
control
is
on
.

3
.
FB
MODE
(TROUBLE
CODES
ARE
DISPLAYED
.)

Function
code
M
i
s
easuring
tem
Contents
to
be
monitored
Scroll
Ref
.
to
Code
Abbreviation

D~ALL
A
maximum
of
3
trouble
codes
are
displayed
in

order
of
occurrence
.

D~NEW
The
most
recent
trouble
code
appears
on
the

select
monitor
display
.

FB1
D~MID
Historyoftrouble
The
second
most
recent
trouble
code
appears
Possible
[T10B0]*10codes
is
displayed
.
on
the
select
monitor
display
.

D~OLDThe
third
most
recent
trouble
code
appears
on

the
select
monitor
display
.

D~REF
A
specified
period
of
time
proceeding
trouble

code
appears
on
the
select
monitor
display
.

Do
*a*
22?(FB1)

FR
.
SS
SOFT

84M0919

NOTE
:

9
If
a
particular
trouble
code
is
notproperly
stored
in

memory
(due
to
a
drop
in
ABSCM&H/U
power
supply,
etc
.)

when
a
problem
occurs,
the
trouble
code,
followed
bya

question
mark
"?",
appears
on
the
select
monitor
display
.

This
shows
it
may
be
an
unreliable
reading
.

9*
a*
refers
to
the
troubles
in
order
of
occurrence
(NEW
.

MID,
OLD
and
REF)
.

91

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

9
.
Select
Monitor
Function
Mode

MEMORY
C
LR
?

0
:
YES
1
:N0

B4M0930

OF
OC~O
ENT

84M0931
I

MEMORY
C
LR
?

0
:
YES
1
:
NO

B4M0930

MEMORY
C
LR
?

*O
:YES
1
:N0

84M0933

PLEASE

KEY
OFF

84M0934

J
:
MODE
FCO

-
HISTORY
OF
TROUBLE
CODES
IS
ERASED

(D
"
CLR)
-

e
Deletes
therecorded
trouble
codes
in
ABS
control
mod-

ule
.

1)
Pressthe
function
key
[F]
[C]
[O]
[ENT]
in
that
order
.

2)
System
indicates
as
shown
.

3)
Press
thefunction
key
[0],
to
clear
memories
.
The
indi-

cation
of
*
is
added
to
screen
.

4)
Press
thefunction
key[ENT]
.
System
indicates
as

shown
.

5)
Turn
ignition
switchto
OFF
.

98

4-4d
[T1
0A01
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

10
.
Diagnostics
Chart
with
Select

Monitor

I
TROUBLE
OCCURS
.I

A
:
BASIC
DIAGNOSTIC
CHART

Is
Select
Monitor
available?
No

Yes

Ask
the
customer
when
and
how
the
trouble
occurred
using
interview
check
list
.

I
PRE-INSPECTION
I

Use
select
monitor,
retrieve
trouble
code
in
function
mode
FBiand
record
the
code
.

Perform
diagnostics
in
accordance
with
trouble
code
.
No
corresponding
trouble
code

Diagnostics
Chart
for
On-board
Diagnosis
System

Inspection
using
General
Diagnostics
chart

Trouble
code
is
designated
or
ABS
warning
light
constantly
remains
on
.

Repair
.

Clear
memory
.

I
INSPECTION
MODE
I

Use
select
monitor,
retrieve
trouble
code
in
function
model
FB1and
recordthe
code
.

No
trouble
code
is
designated
and
ABS
warning
light
goes
out
after
turning
on
.

I
CONFIRMATION
TEST
I

END

B4M1076A

CAUTION
:

Remove
foreign
matter
(dust,
water,
etc
.)
from
the

ABSCM&H/U
connector
during
removal
and
installation
.

NOTE
:

To
check
harness
for
broken
wires
or
short
circuits,
shake

it
while
holding
it
or
the
connector
.

102

1. Foreword
This chapter describes major inspection and service pro-
cedures for the engine mounted on the body. For proce-
dures not found in this chapter, refer to the service proce-
dure section in the applicable chapter.
2. Ignition Timing
A: MEASUREMENT
1. 2200 cc MODEL
1) Warm-up the engine.
G2M0094
2) To check the ignition timing, connect a timing light to #1
cylinder spark plug cord, and illuminate the timing mark
with the timing light.
3) Start the engine at idle speed and check the ignition
timing.
If the timing is not correct, check the ignition control sys-
tem.
Ignition timing [BTDC/rpm]:
14°±8°/700 (MT)
20°±8°/700 (AT)
2. 2500 cc MODEL
CAUTION:
After warming-up, engine becomes very hot. Be care-
ful not to burn yourself during measurement.
1) Warm-up the engine.
B2M0750A
2) To check the ignition timing, connect a timing light to #1
cylinder spark plug cord, and illuminate the timing mark
with the timing light.
3) Start the engine at idle speed and check the ignition
timing.
If the timing is not correct, check the ignition control sys-
tem.
Ignition timing [BTDC/rpm]:
15°±8°/700
2
2-2
1. Foreword - 2. Ignition Timing