engine SUBARU LEGACY 1996 Service Owner's Manual

2_7
[T501]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

5
.
Specified
Data

5
.
Specified
Data

1
.
ENGINE
CONTROLMODULE
(ECM)
I/O
SIGNAL

++u++u++u++u
++~~
++++

1
1
0

to
B84

9
11
1
8
1
7
11
6
1
5
1
1
4
1
3
1
U

44
4
8
7
7525B8584
161
u1
1

4443~
2
~
$Q
7$
9
~
8~
7
~

u
1
11
u
1
9
u

7
33
3231

6~
5
1

u
8
7

322

7
u
6
5
2222

43251
0
u

2

4
32
1

2121
11

6

OBD0092A

Signal
(V)

Content
Connector
Terminal
Ignition
SW
ON
Note
No
.
No
.
Engine
ON
(Idling)
(Engine
OFF)

Crankshaft
Signal
(+)884
8
0
-7-
+7
Sensor
output
waveform

position
Signal
(-)
B84
29
00
-

sensor
Shield
B84
54
00
-

Camshaft
Signal
(+)B84
70
-7-
+7
Sensor
output
waveform

position
Signal
(-)
B84
28
0
0
-

sensor
Shield
B84
5400
-

Mass
air
Signal
B84
5
0-0
.3
0
.8-
1.2
-

flow
Shield
B84
5700
-

sensor
GND
B84
2000
-

Fully
closed
:
0
.2
-
1
.0

Throttle
Signal
B84
6
Fully
opened
:
4
.2
-
4
.7

position
Power
B84
21
55
-
sensor
supply

GND
B84
2000
-

Front
Signal
B84
230
0-0
.9
-
oxygen

sensor
Shield
B84
56
00
-

Rear
Signal
B84
240
0-0
.9
-
oxygen

sensor
Shield
B84
56
0
0
-

Engine
coolant
BS4
22
1
.0-1
.41
.0-1
.4
After
warm-up
re
sensor
temperature

"5"
and
"0"
are
repeatedly
speed
sensor
B84
830or50or5
displayed
when
vehicle
is

driven
.

165
u
1
1
u
2
11
uuuuu2
1

7
3
333
31
3
2
2
22
2
2
2
2
21
1
1
1
7
4
2
1

44

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TSO1]
2-7
5
.
Specified
Data

C
t
T
il
Signal
(V)

Content
onnec
or
erm
na
Ignition
SW
ON
Note
No
.
No
.
Engine
ON
(Idling)
(Engine
OFF)

Starter
switch
B84
8600
Cranking
:
8
to
14

A/C
switch
B84
60
ON
:
10
-
13
ON
:
13
-
14

OFF
:
0
OFF
:
0

Ignition
switch
B84
85
10-13
13-
14
-

Neutral
position
switch
B84
82
ON
:
0
Switch
is
ON
when
shift
isin
"
"
OFF
:
5
.0f0
.5
"N
or
"P
position
.

Test
mode
connector
884
84
55
When
connected
:
0

Knock
Signal
B84
32
.8
2
.8
-

sensor
Shield
B84
56
00
-

AT/MT
identification
B84
81
55
When
measuring
voltage

between
ECM
and
body
.

Back-up
power
supply
B84
39
10-1313-14
Ignition
switch
"OFF"
:
10
-
13
Control
unit
power
1
supply
B84

2
10-13
13-14
-

Ignition
#
1,
#
2
B84
41
0
1
-3
.4
-

control
#
3,
#
4
B84
400
1
-3
.4
-

#
1
B84
96
10-13
1-14
Waveform

Fuel
#
2
B84
70
10-13
1-14
Waveform

injector
#
3
B84
44
10-13
1-14
Waveform

#
4
B84
16
10-13
1
-14
Waveform

Idle
air
OPEN
endB84
14
-
1
-13
Waveform
control

solenoid
CLOSE
B84
13
-
13-1
Waveform
valve
end

Fuel
pump
relay
g84
32
ON
:
0
.5,
or
less0
.5,
or
less
-
control
OFF
:
10
-
13

A/C
relay
control
B84
31
ON
:
0
.5,
orless
ON
:
0
.5,
or
less
OFF
:
10
-
13
OFF
:
13
-
14

Radiator
fan
relay
1
ON
:
0
.5,
or
less
ON
:
0
.5,
or
less

control

B84
74
OFF
:
10
-
13
OFF
:
13
-
14

Radiator
fan
relay2

B84
73

ON
:
0
.5,
or
less
ON
:
0
.5,
or
less
With
A/C
vehicles
only
control
OFF
:
10
-
13
OFF
:
13
-
14

Self-shutoff
control
B84
63
10-13
13-14
-

Malfunction
indicator
B84
58Light
"ON"
:
1,
or
less

lamp
Light
"OFF"
:
10
-
14

Engine
speed
output
B84
64
-
0
-
13,
or
moreWaveform

Torque
control
signal
B84
79
5
5
-

Mass
air
flow
signal
B84
47
0-0
.3
0
.8-
1
.2
-

Purge
control
solenoid

B84
72

ON
:
1,
or
less
ON
:
1,
or
less

valve
OFF
:
10
-
13
OFF
:
13
-
14

Atmospheric
pressure
B84
263
.9-4
.1
2
.0-2
.3
-
sensor

Pressure
sources
ON
:
1,
or
less
ON
:
1,
or
less
switching
solenoid
B84
15
OFF
:
10
-
13
OFF
:
13
-
14valve

EGR
solenoid
valve
B84
71
ON
:
1,
or
less
ON
:
1,
or
less

OFF
:
10
-
13
OFF
:
13
-
14
Front
oxygen
sensor
g84
38
0-1
.0
0-1
.0
-
heater
signal

45

2-7
tT5o21
ON-BOARD
DIAGNOSTICS
II
SYSTEM
5
.
Specified
Data

CT
il
Signal
(V)

Content
onnector
erm
na
I9nition
SW
ON
Note
No
.
No
.
(Engine
OFF)Engine
ON
(Idling)

Rear
oxygen
sensor
B84
37
0-1
.0
0-1
.0
-
heater
signal

AT
diagnosis
input
B84
80
Less
than
1
.-
.
More
Less
than
1
+-+
MoreWaveform
signal
than4
than
4

GND
(sensors)
B84
200
0
-

i
B
469
GND
(
njectors)
80
0
-
95

GND
(ignition
system)
B84
940
0
-

ND
l
B
4
19
(powersupp
y)
G
800
-
46
17
GND
(control
systems)
B84
00
-
18

GND
(oxygen
sensor
B84
4200
heater)

2
.
ENGINECONDITION
DATA

Content
Specified
data

i
fl
M
1.7
-
3
.3
(g/sec)
:
Idling
r
ass
a
ow
7
.1
-
14
.2
(g/sec)
:
2,500
rpm
racing

E
il
d
1.6
-
2
.9
(%)
:
Idling
ng
neoa
6
.4
-
12
.8
(%)
:
2,500
rpm
racing

Measuring
condition
:

"
After
warm-up
theengine
.

"
Gear
position
is
in
"N"
or
"P"
position
.

"
A/C
is
turned
OFF
.

All
accessory
switches
are
turned
OFF
.

46

2-7
(T6A1]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

6
.
Wiring
Diagram
and
Wiring
Harness

Combination
mete

Tachometer
il0
:e

i
12
:
b

Malfunction
I
il4
:c
indicator
~--
lamp

Speedometer
circuit

ill

Main
relay
~`1
o
B47
Twi
sted
wire

0

846
E

:~~M
R
Fuel
pump
relay

6
.
Wiring
Diagram
and
Wiring
Harness

A
:
WIRING
DIAGRAM

1
.
ENGINE
ELECTRICAL
SYSTEM

To
Power
Supply
Routing

FB-20
~

FUSE
Na
15

MB-3

SBF-2

FB-4

FUSE
Na
l6

ST

IG
SW

FB-22

FUSE
Na
15
I2
B37

i3
B39

S
.
M
.
J
.
[Refer
to
foldout
page
.)

R58R57RIS

Fuel
pump

Inhibitor
switch

812
F45
B62

Check
connector
a
v
879

mvov-~o
M
PPm
M
f~
vrn
f~
Om
.O

Enginecontro
I
B84
module

14001

B97B17

Rl

Vehicle
speed
sensor
2

g7
(B
I
ac
k)
i
It
(g
)(Green)
Rl5
(B
I
ec
k)
R58

1212
123
34
3456
456

i
14
(L
1
ght
gray)
I101l2
(L
I
ght
gray)

12345678910111213
123456789101111314116

50

B47
(Brown)
B12
(Gray)

1
2
1
23
4345
67
8
5
69
1011
12

F45
B79
(Gray)

1
23
4567
8
910
11121R314

(2
i3
(Brown)

2345
6789
1234
678910
1'1
11
1
1
1
13
1
14
1
15
1
16
1
17
1
18
1
19
1
20,011
1
12
1
13
1
14
1
1
51
16
1
17
1
18
1
19
1
20
1
21
1
22
1

BUR10-02A

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

6
.
Wiring
Diagram
and
Wiring
Harness

Engine
Shield
Boost
Throttle
coolant
joint
sensorposition
Knock
temperature
E
.G.R
.
connector
sensor
sensor
sensor
solenoid

BB3
FF
R
I
B2
H
I
(
:
P
P
(:
9
)
PEE
(
ED
EH
(
9
)

....

E2

821

Ref
.
toAT
control
system
.

Enginecontro
I
B84
module

....

822

E3

B3

Mess
air
flowsensor

.
.
..
..
..
III

(Ca
I
(forn
(a
mode
I)
arri

813
m
EE

Ignitor
O

(Brown)
El8
E8
(Brown)
(B
I
eck)
B2
El3
(Brown)

12
123

B3
(Grey)(
ED
(Grey)

1234
123456

52

Ell
(Gray)

123

B2l
(L
i
ght
gray)

1234
5678
910U12

Ell

Ignition
coil

B83

1234

B22
CL
i
ght
gray)

1234
5678
9
1011
12
13141516

BUR10-02C

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TSAy]
2-7
6
.
Wiring
Diagram
and
Wiring
Harness

CrankshaftCamshaftpositionposition
sensorsensor

E10
I
E15

....
.
.
...
1
11
_..
.
..
._.J
r--
..

U)
33
3
:
E
1

------------

-----------
-

m
M
~
B20
V1

1I1III
_
1

y
P
Iu+IN'"I
INI
II

Engine
control
B84
module

v
M
~~l
c
o
JJ
a
J
L
m
m
J3

F

Y
J
J
J
J

P1
H

JJ
L
m
;
~N
E3

4

}E17
~~
Eb
~
E16
~
E5
3E7
~~
A
E4

#4
#3#2
#1
Fuel
(nJector

Ely
(Dark
grey)

E10
(Gray)

12

E4
(B
I
ue)
E7
(Gray)
B20
(L
i
ght
grey)

12
123
123
456

BUR10-02D

Idle
air
control
Purge
control
solenoid
valve
solenoid
valve

B84
(Light
blue)

1
2
LI3
4
U
5
6U78U
1112
0
1314
1J
1516
1718
1920
21
22
23
24
252627282930
1
31
1
32
1
33
1
34
1
35
1
36~
1
37
1
38
1
39
1
401
41
1421
43
44
45
1
46
1
47
1
48
1
49
1
5
0
1
51
1
52
1
53
1
54,
~
5
1
56
1
57
1
8
626364
65
bb
6768
69
7071
7273
74
75
7
6
77
78
79
80
81
B283
1
84
1
65
1
86
1
87
1
88
1
89
1
90
1
91
1
92
1
93
1
94
1
95
1
96

(L
(
ght
gray)
E5
El6
(L
(
ght
gray)
(Darkgray)
E6
(O
(Dark
grey)

12

53

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[Tsn2i
2-7

6
.
Wiring
Diagram
and
Wiring
Harness

FWD
switch
(AWD)

B9
ffl

Droppig
Cruise
resistor
cont
rol
modu
le

OBD-II
Data
link
serviceCheck
connectorconnectorconnector

B78
ERB40
0
B79
m
B4
E
K
E
)

w
7
OEs
o
-
-
-
------------------
-
------
-
-
L
a
....

c
H
0
U
It

C
Y
0
.N
;W
Rr
06
N

BI1
T41
Ref
.
to
/Engine
electrical
system
.

a
:
B54

b
:
B55

c
:
856

She
ild
joint
connector
884

~

WK
LZIM
WL

B53
Engine
control
B9(B
I
ac
k)
module
1
2

854
(B
I
ac
k)
B79
(Grey)

1
23456
1
23
45
67
7
1
8
1
9101112
8
910
1112
1
13
1
14
r,

Bll
(Grey)
(B
I
ac
k)
B56894
(B
I
aCk)

34

S

78

D

q
Oil
2
9
Pl
.
12131415,91617
la19
110
I
5
16
1
3
14
1111121131141151161171161191201

AT
contro
I
------------
a
,,
Vehicle
speed
i(Transmission)
___
_____
__
__
sensor
1

ATF
temperature
sensor
Line
pressuresolenoid

Lock-up
solenoid

AWD
solenoid

Shift
solenoid
1

Shift
solenoid
2

Shift
solenoid
3

R3
Throttle
~-Cz'1
R~l
position
sensor

B2l
E2
El3

O
(Gray)
E13
(Brown)
853
B78
(Y
e
II
ow)

12
123
1234
56789

B55
(B
I
ack)
(
ED
(Grey)

12345678
12345678
9~011t213141St6
91111213141516

864
(L
i
ght
b
I
ue)

12
345678
9l0
lll21314
1516
I7l8l9
20
2122
23
24
2627282930
3132
3334
35
3637383940
4142
43
44
454647
1
48
1
49
~
0
1
51
2
15
3
15
4
~
5
1
56
15
7
8596061626364656667686970
7172
73
1
74
1
75
1
76
1
77
78
1
79
1
60
1
81
B
1
132
1
83d
8485
86
87888990
9192
93
94
9596

BUR41-02B

55

2-7
[TSB21
ON-BOARD
DIAGNOSTICS
11
SYSTEM

6
.
Wiring
Diagram
and
Wiring
Harness

B
:
ELECTRICAL
WIRING
HARNESS
AND

GROUND
POINT

2
.
BULKHEAD
WIRING
HARNESS
AND
GROUND

POINT
(IN
ENGINE
ROOM)

B6M0587A

56

2-7
[T8A0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

8
.
Diagnostics
for
CHECK
ENGINE
Malfunction
Indicator
Lamp
(MIL)
8
.
Diagnostics
for
CHECK
ENGINE

Malfunction
Indicator
Lamp
(MIL)

A
:
CHECK
ENGINE
MALFUNCTION

INDICATOR
LAMP
(MIL)
DOES
NOT
COME
ON
.

WIRING
DIAGRAM
:

Combination
meter

14

1pition

No
.
15
switch

ECM

884

9
11
12
1314
U
1
16
10
3637
383940
4142
4344
3132
333435
58
5960
616263
646566676897084
85
868788
89909192
93949596

i2

1
345
678910
1112
13141516171819
20
2122

COC-A
CI
1
')=
.

i14

1
1
1
2
1
3
1
4
1
5
1
6f7f8
]
9
1
10
1
11
1
12
1
131

B2M0507

NOTE
:

For
the
diagnostic
procedure
on
indicator
lamp
(MIL)

does
not
go
on,
referto
2-7
[T7A0]*2
.

58

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TBSO]
2-7
8
.
Diagnostics
for
CHECK
ENGINE
Malfunction
Indicator
Lamp
(MIL)

B
:
CHECK
ENGINE
MALFUNCTION

INDICATOR
LAMP
(MIL)
DOES
NOT
GO
OFF
.

WIRING
DIAGRAM
:

Combination
meter

884837

ECM
~{------(

u

884

9
1
12
l.
.f
1314
1
1610
1
6
37
383940
4142
4344
3132
33
34353859
606162
63
64
65666689708485
86
8188
8990
9192
93949596

i2

12345
67
910
16171819202122
1112131415

i14

1
1
1
2
1
3
1
4
1
5
1
6M78
9
1
10
1
11
1
12
-
ti
-
31

B2M0507

NOTE
:

For
the
diagnostic
procedure
on
indicator
lamp
(MIL)

does
not
go
off,
referto
2-7
[T7B0]*2
.

59