engine SUBARU LEGACY 1996 Service Workshop Manual

2-7
[T11BF0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

11
.
Diagnostics
Chart
with
Trouble
Code

BF
:
DTC
P1103

-
ENGINE
TORQUE
CONTROL
SIGNAL

CIRCUIT
MALFUNCTION
(TRQ)
-

WIRING
DIAGRAM
:

B84B55

ECM
~9
~
TCM

B84

12
u34
u
u
78
u

171819
202122
23
2128
2930

45464748495054555651

1172
73747576
77171179
80
8182
83

y

B55

12345

1
9
1
10
1
11
1
12
1
13
1
1041516

82M0598

NOTE
:

For
the
diagnostic
procedure
on
engine
torque
control

signal
circuit
malfunction
(DTC
P1103),
refer
to
2-7

[T10BG0)*2
.

124

5-5b
[TaAO]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

4
.
Diagnostics
Chart
for
On-board
Diagnostic
System

4
.
Diagnostics
Chart
for
On-board

Diagnostic
System

A
:
BASIC
DIAGNOSTICS
PROCEDURE

1)
Airbag
warning
light
comes
"ON"
.

2)
Turn
ignition
switch
to
"ON",
(engine
"OFF")
and
observe
airbag
warning
light
.

3)
If
airbag
warning
light
stays
"ON"
after
8
seconds
or
remains
"OFF",
or
comes
back
"ON"
after
30
seconds,
this
indicates

a
current
problem
.
Proceed
to
step
8)
.

If
airbag
warning
light
comes
"ON"
for
8
seconds,
then
goes
out
and
stays
out,
this
indicates
normalsystem
operation
atthis

time
.
Check
the
memory
for
intermittent
problems
by
performing
the
procedure
outlined
in
[T4B0)tr2
"ON-BOARD

DIAGNOSTICS"
.
Proceed
to
step
4)
.

4)
If
trouble
code
indicated,
<
Ref
.
to
[T4D1]*2
-
[T4D2]
.*2>
proceed
to
step
5)
.

If
normal
code
indicated,
<
Ref
.
to
[T4D2]
.
>
proceed
to
step
6)
.

5)
Repairand
replacement,
<
Ref
.
to
[T5P1]
.*2>
proceed
to
step
7)
.

6)
Repair
and
replacement,
<
Ref
.
to
[T5Q1]
.*2>
proceed
to
step
7)
.

7)
Turn
ignition
switch
"ON",
(engine
"OFF")
and
observe
airbag
warning
light
.
If
airbag
warning
light
stays
"ON"
after
8

seconds
or
comes
back
"ON"
after
30
seconds,
proceed
to
step
8)
.

If
airbag
warning
light
comes
"ON"
for
8
seconds,
then
goes
out
and
stays
out,
proceed
to
step
9)
.

8)
Repair
and
replacement
.
<
Ref
.
to
[T4E1]
.*2>
Proceed
to
step
10)
.

9)
Clear
memory
.
<
Ref
.
to
[T4C0]
.z`r2>
Proceed
to
step
10)
.

10)
END

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T4CO]
5-5b

4
.
Diagnostics
Chart
for
On-board
Diagnostic
System

2

L3141
B5mol
15B

2

33

E
;1
1~3141516
B5M01
16B

B
:
ON-BOARD
DIAGNOSTIC

When
the
airbag
system
isin
functioning
condition,
the

airbag
warning
light
will
remain
on
for
8
seconds
and
go

out
when
the
ignition
switch
is
set
to
ON
.

If
there
is
any
malfunction,
the
airbag
warning
light
will

either
stay
on
or
off
continuously
.
In
such
cases,
perform

on-board
diagnostic
in
accordance
with
the
specified
pro-

cedure
to
determine
trouble
codes
.

1)
Turn
ignition
switch
ON
(with
engine
OFF)
.

2)
ConnectDIAG
.
terminal
T
to
No
.
1
terminal
of
diag-
nosis
connector
~2
located
below
lower
cover
.

3)
Check
in
accordance
with
the
trouble
code
indicated

by
the
AIRBAG
warning
light,
and
record
the
trouble

codes
.

4)
Turn
the
ignition
switch
"OFF"
and
remove
the
DIAL
.

terminal
from
No
.1
terminal
of
diagnosis
connector
.

C
:
CLEAR
MEMORY

After
eliminating
problem
as
per
trouble
code,
clear
mem-

oryas
follows
:

Make
sure
ignition
switch
is
ON
(and
engine
off)
.
Connect

one
DIAL
.
terminal
1Q
on
diagnosis
connector
(Z
termi-
nal
No
.
1
.

While
warning
light
is
flashing,
connect
the
other
DIAL
.

terminal
(Z
on
terminal
No
.
2
for
at
least
three
seconds
.

After
memory
is
cleared,
normal
warning
light
flashing
rate

resumes
.
(Warning
light
flashes
every
0
.6
seconds

ON-OFF
operation
.)
Memory
cannotbe
cleared
if
any

problem
exists
.

After
clear
memory
and
then
DIAG
.
terminals
(1)
and
(3),

extract
from
diagnosis
connector
02
.

9

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5H11
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

H
:
TROUBLE
CODE
31

DIAGNOSIS
:

"
Airbag
control
module
is
faulty
.

"
Airbag
main
harness
circuit
is
open
.

"
Fuse
No
.
16
is
blown
.

"
Body
harness
circuit
is
open
.

1
1
.
Airbag
control
module
inspection

1
2
.
Airbag
main
harness
Inspection

1
3
.
Fuse
No
.
16
inspection

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
cable

and
then
wait
at
least
20
seconds
.

After
20
seconds
elapse,
remove
instrument
panel
lower
cover,
and
disconnect
(AB3)
and
(AB8),
(AB9)
and

(AB10)
.

1
.
AIRBAG
CONTROL
MODULE
INSPECTION

1)
Disconnect
connector
(AB6)
fromairbag
control
mod-

ule
<
Ref
.
to
5-5
[W6A0].*2
>,
and
connect
it
to
test
har-

ness
B2
connector
(8B)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
.

3)
Measure
voltage
across
connector
(5B)
terminal
and

chassis
ground
.

CHECK
:
Connector
&
terminal

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

Is
voltage
more
than10
V?

Replace
airbag
control
module
.

No
:
Go
to
step
2
.

25

5-5b
[TWO]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

5
.
Diagnostics
Chart
with
Trouble
Code

J
:
TROUBLE
CODE
34

DIAGNOSIS
:

9
Airbag
main
harness
circuit
(Passenger)
is
shorted
to

power
supply
.

*Airbag
module
harness
(Passenger)
is
shorted
to
power

supply
.

9
Airbag
control
module
is
faulty
.

r
1
.
Airbag
main
harness
inspection
l

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
termi-

nal
and
thenwait
at
least
20
seconds
.

After
20
seconds
elapse,
remove
instrumentpanel
lower
cover,
and
disconnect
(AB3)
and
(AB8),
(AB9)
and

(AB10)
.

1
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Disconnect
connector
(AB6)
from
airbag
control
mod-

ule
<
Ref
.
to
5-5
[W6A0].*2
>,
and
connect
it
totest
har-

ness
132
connector
(8B)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
.

3)
Measure
voltage
across
each
test
harness
132
connec-

tor
(5B)
terminal
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(5B)
No
.
6
(+)
-
Chassis
ground
(
)
:

Is
voltage
less
than
1
V?

ves
:
Go
to
next
CHECK

No
:
Replace
airbag
main
harness
.

CHECK
;
Connector
&
terminal

(5B)
No
.
7
(+)
-
Chassis
ground
(
)
:

Is
voltage
less
than
1
V?

,rES
:
Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

28

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5M1]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

1.
Airbag
main
harness
Inspection

M
:
TROUBLE
CODE
43

DIAGNOSIS
:

*
Airbag
main
harness
circuit
(Driver)
is
shorted
to
power

supply
.

Airbag
module
harness
(Driver)
is
shorted
to
power

supply
.

"
Roll
connector
is
shorted
to
power
supply
.

"
Airbag
control
module
is
faulty
.

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
termi-

nal
and
thenwait
at
least
20
seconds
.

After
20
seconds
elapse,
remove
instrument
panel
lower
cover,
and
disconnect
(AB3)
and
(AB8),
(AB9)
and

(AB10)
.

1
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Disconnect
connector
(AB6)from
airbag
control
mod-

ule
<
Ref
.
to
5-5
[W6A0]
.*2>,
and
connect
it
to
test
har-

ness
132
connector
(8B)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
.

3)
Measure
voltage
across
each
test
harness
132
connec-

tor
(5B)terminal
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(5B)
No
.
1
(+)
-
Chassis
ground
(
)
:

Is
voltage
less
than
1
V?

YES
.
G
o
tonext
CHECK

No
:
Replace
airbag
main
harness
.

CHECK
:
Connector&
terminal

(58)
No
.
14
(+)
-
Chassis
ground
(-)
:

Is
voltage
less
than
1
V?

vES
:
Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

31

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5N2]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

B31
1A

5A
r
.~
..

,fl((
i

1
23
45B
7
89
101
.112131415
761718
I

B5M0123B

i

1
2
31
5
8789
[
lo
l
l1
1
12
1
13
1
14
1
15
1
16
1
17
1
.
t18
20

i

G5M0559
I

2
.
INSPECTION
OF
BODY
HARNESS,
CONNECTOR

AND
AIRBAG
WARNING
LIGHT

1)
Turn
ignition
switch
"OFF"
and
connect
body
harness

connector
(B31)
to
test
connector
A
connector
(1A)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON",
(engine
off)
and
connect
connectors
(3A)
and
(4A)
.

CHECK
;
Does
the
airbag
warning
light
come
off?

,rES
:
Go
tostep
3)
.

Go
tonext
~
.

~K
:
Is
there
anything
unusual
to
body
harness?

Repair
body
harness
.

Replace
airbag
warning
light
module
1~
.

NOTE
:

After
problem
has
been
eliminated,
disconnect
connectors

(3A)
and
(4A)
.

3)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
at
least
20
seconds,
and
re-connect

connectors
(AB1)
and
(B31)
.

4)
Remove
instrument
panel
lower
cover
and
disconnect

(AB3)
with
(AB8),
then
disconnect
connector
(AB6)from

airbag
control
module,
<
Ref
.
to
5-5
[W6A0]
.*2
>
and

connect
it
to
test
harness
132
connector
(8B)
.

5)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON,"
(engine
off)
and
connect
connectors
(6B)
and
(7B)
.

CHECK
:
Does
the
airbag
warning
light
come
on?

0
:
Go
to
step
3
.

No
:
Replace
airbag
main
harness
.

NOTE
:

After
problem
has
been
eliminated,
disconnect
connectors

(6B)
and
(7B)
.

33

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T502]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

O
:
AIRBAG
WARNING
LIGHT
REMAINSOFF
.

DIAGNOSIS
:

"
Fuse
No
.
15
is
blown
.

"
Body
harness
circuit
is
open
.

"Airbag
warning
light
is
faulty
.

"
Airbag
main
harness
is
faulty
.

"Airbag
control
module
is
faulty
.

1
1
.
Fuse
No
.
15inspection

1
2
.
Body
harness
inspection

3
.
Airbag
warning
light
module
(in
combination

meter)
inspection

1
4
.
Airbag
main
harness
Inspection

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground

terminal,
and
then
wait
at
least
20
seconds
.

1
.
FUSE
No
.
15
INSPECTION

Remove
and
visually
check
fuse
No
.
15
.

CHECK
;
Is
fuse
No
.
15
blown?

(]
ES
:
Replace
fuse
No
.
15
.

If
fuse
No
.
15
blows
again,
go
to
step
2
.

No
:
Go
to
step
2
.

2
.
BODY
HARNESS
INSPECTION

Turn
ignition
switch
"ON"
(engine
off)
to
make
sure
other

warning
lights
(in
combination
meter)
illuminate
.

CHECK
:
Do
all
the
warning
lights
(in
combination

meter)
except
airbag
warning
light
come
on?

vES
:
Go
to
step
3
.

No
:
Repair
body
harness
.

35

5-5b
(T503]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

5
.
Diagnostics
Chart
with
Trouble
Code

B31

AB1

r
`,~~,
;
r
:cr

B5M01228

0)0
0

J
J

AB

B8

.
.o/

G5M0312

3
.
AIRBAG
WARNING
LIGHT
MODULE
(IN

COMBINATION
METER)
INSPECTION

1)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
at
least
20
seconds
.

2)
Disconnect
body
harness
connector
(B31)
fromcon-

nector
(AB1),

3)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
to
make
sure
airbag
warning
light
illu-

minates
.

CHECK
:
Does
the
airbag
warning
light
come
on?

vss
:
Go
to
step
4
.

Replace
airbag
warning
light
module

4
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
atleast
20
seconds
.

2)
Connect
body
harness
connector
(B31)
and
connector

(AB1)
.

3)
Disconnect
connectors
(AB3)
and
(AB8)
below
steering

column
.
<
Ref
.
to
5-5[M2-6]
.*1
>

4)
Disconnect
connector
(AB6)
from
airbag
control
mod-

ule
.
<
Ref
.
to
5-5
[W6A0]
.*2
>

5)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
to
make
sure
airbag
warning
light
illuminates
.

CHECK
:
Does
the
airbag
warning
light
come
on?

Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

36

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5G17]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

v
0
v

GSM0461

5
.
FUSENo
.
16,
AIRBAG
MAINHARNESS,
BODY

HARNESS
VIBRATION
INSPECTION

Conduct
vibration
inspection
on
fuse
No
.
16,
airbag
main

harness
and
body
harness
.

CAUTION
:

Do
not
shake
or
vibrate
airbag
control
module
.

CHECK
:
Do
fuse
No
.
16,
airbag
main
harness
or
body

harness
malfunction
again
when
shaking?

Replace
faulty
airbag
component
parts
.

No
:
Go
to
step
6
.

NOTE
:

Gently
shake
each
part
.

6
.
SHOWERING
INSPECTION
TO
BODY

Spray
water
on
vehicle
body
.

CAUTION
:

Do
not
directly
spraywater
on
each
part
.

CHECK
:
Does
wafer
leak
into
the
passenger
compart-

ment
when
showering
vehicle?

,res
:
Replace
faulty
airbag
component
parts
.

No
:
Go
to
step
7
.

NOTE
:

If
leaks
are
noted,
check
wiring
harnesses
as
water
may

leak
along
them
and
get
parts
wet
.

7
.
WARNING
LIGHT
ILLUMINATION
CHECK

Turn
ignition
switch
"ON"
(engine
off)
and
observe
airbag

warning
light
.

CHECK
:
Does
the
airbag
warning
light
comes
on
for
8

seconds,then
go
out
and
stay
out?

,rES
:
Clear
memory
.

Go
to
[T4E0]*2
"DIAGNOSTICS
PROCEDURE"
.

43