Fuel system SUBARU LEGACY 1996 Service User Guide

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

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
11
SYSTEM
[M0]
2-7
9
.
Diagnostics
for
Engine
Starting
Failure

E
:
FUEL
PUMP
CIRCUIT

WIRING
DIAGRAM
:

Fuel
pump

#F

S
.M
.J
.

A57R15
R1
B97

N7--

E

Fuel
pump
relay

0
7

SBF-2

~-
No
.16
IG

-L

862F45

cL
.M

O

111213111516
R5B
Ri5
B46

*9
3637
39
412
4344
1
23
1
2
1
2
636466
67
6869
70
4
56
345634
8889
90
9192
9
96
u
SBF-4

~5

12345
69
1112131
15161718192
10

B2M0783

NOTE
:

For
the
diagnostic
procedure
on
fuel
pump
circuit,
refer
to

2-7
[T8EOj*2
.

65

2-7[T9F0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
9
.
Diagnostics
for
Engine
Starting
Failure

F
:
FUEL
INJECTOR
CIRCUIT

WIRING
DIAGRAM
:

Main
relay
0
0

847

SBF-2

884
B22
E3E6
E11

#3
tt4

E5
E16
ECM
#1
#2

B84B22847E5
E6
E16E17

11
1234
34
678

1
[

1
2
903
9
101112
34
9
13141
i6

82M0784

NOTE
:

Forthe
diagnostic
procedure
on
fuel
injector
circuit,
refer

to
2-7
[T10Q0]*2
.

66

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[Tyooyl
2-7
10
.
General
Diagnostics
Table

10
.
General
Diagnostics
Table

1
.
FOR
ENGINE

1
23
4
5678
9
10
11
1213

N

ONCdN
C
O
O
a
x
m

Problem
parts
`o
m
v

mj
4'S
O
1>j
T
N
dm
G

~
ON

41
m
~
!d
V
P]
7
0
E
m
~n
N
~o
C
o
O
d
~
~
U
O
c
m~
C
.
.
.
V1
ON
aVa
U
3
C~
0

"

y
dO1OyOQ
~
"O
CN
d7

O
"
0va
l0
0CdyGo
>
"
Vd
da
E
U
"
O
l0
ymC
~
O
NC
N
V
V
4)
N
~
'C
C
.2
7
a
3NmC
oi
mm
o
W
m
.
mU
o~
Symptom
2WFU~Ya
LL
.0
ti
QW

1
Engine
stalls
during
idling
.
O4OOOOO

2
Rough
idling
O
4O
Cl
OO

3
Engine
does
notreturnto
idle
.
O
OO

4Poor
acceleration
O4OOOOO

Engine
stalls
or
engine
sags
or
hesi-
O
D
OOOOOO
fates
at
acceleration
.

6
Surge
O4OOOO

T
Spark
knock
OOOO

8
After
burning
in
exhaust
system
O
Lr
I
O
I

'1
:
The
mark,
D,
indicates
the
symptom
occurring
only
in
cold
temperatures
.

'2
:
For
itemswiththe
mark,
D,ensure
the
secure
installationof
crankshaft
position
sensor
and
camshaft
position
sensor
.

Replacement
is
not
necessary
.

'3
:
Check
fuel
injector,
fuel
pressure
regulator
and
fuel
filter
.

'4
:
Check
ignitor,
ignition
coil
and
spark
plug
.

NOTE
:

Malfunction
of
partsother
than
the
above
is
also
possible
.
Refer
to
1
.
Engine
Trouble
in
General
[K100]
in
Repair
Section
2-3
of

the
Service
Manual

69

2-T
[T11A0]
ON-BOARD
DIAGNOSTICS
11
SYSTEM

11
.
Diagnostics
Chart
with
Trouble
Code

11
.
Diagnostics
Chart
with
Trouble
Code
A
:
DIAGNOSTIC
TROUBLE
CODE
(DTC)
LIST

DTC

No
.

Abbreviation

(Subaru
select
monitor)Item
Page

P0100
QA
Mass
air
flow
sensor
circuit
malfunction
76

P0101
QA
-
RMass
air
flow
sensor
circuit
range/performance
problem
77

P0105
P
-
S
Pressure
sensor
circuit
malfunction
78

P0106
PS
-
R
Pressure
sensor
circuit
range/performance
problem
79

P0115
TW
Engine
coolant
temperature
sensor
circuit
malfunction
80

P0120
THV
Throttleposition
sensor
circuit
malfunction
81

P0121
TH
-
R
Throttleposition
sensor
circuit
range/performance
problem
82

P0125
TW
-
CL
Insufficient
coolant
temperature
for
closed
loop
fuel
control
83

P0130
F02
-
V
Front
oxygen
sensor
circuit
malfunction
84

P0133
F02
-
R
Front
oxygen
sensor
circuit
slowresponse
85

P0135
F02H
Front
oxygen
sensor
heater
circuit
malfunction
86

P0136
R02
-
V
Rear
oxygen
sensor
circuit
malfunction
87

P0139
R02
-
R
Rear
oxygen
sensor
circuit
slowresponse88

P0141
R02H
Rear
oxygen
sensor
heater
circuit
malfunction
89

P0170
FUEL
Fuel
trim
malfunction
90

P0201
INJ1Fuel
injector
circuit
malfunction
-
#1

P0202
INJ2Fuel
injector
circuit
malfunction
-
#2
91
P0203
INJ3Fuel
injector
circuit
malfunction
-
#3

P0204
INJ4Fuel
injector
circuit
malfunction
-
#4

P0301
MIS
-
1
Cylinder
1
misfire
detected

P0302
MIS
-
2
Cylinder
2
misfire
detected
2
P0303
MIS
-
3
Cylinder
3
misfire
detected
9

P0304
MIS
-
4
Cylinder
4
misfire
detected

P0325
KNOCK
Knock
sensor
circuit
malfunction
93

P0335
CRANK
Crankshaft
position
sensor
circuit
malfunction
94

P0340
CAM
Camshaft
position
sensor
circuit
malfunction
95

P0400
EGR
Exhaust
gas
recirculation
flow
malfunction
96

P0403
EGRSOL
Exhaust
gas
recirculation
circuit
malfunction
97

P0420
CAT
Catalyst
system
efficiency
below
threshold
98

P0441
CPC
-
F
Evaporative
emission
control
system
incorrect
purge
flow
99

P0443
CPC
Evaporative
emission
control
system
purge
control
valve
circuit
malfunction
100

P0500
VSP
Vehicle
speed
sensor
malfunction
101

P0505
ISC
Idle
control
system
malfunction
102

P0506
ISC
-
L
Idle
control
system
RPM
lower
than
expected
103

P0507
ISC
-
H
Idle
control
system
RPM
higher
than
expected
104

P0600
-
Serial
communication
link
malfunction
105

P0601
RAM
Internal
control
module
memory
check
sum
error
106

P0703
ATBRK
Brake
switch
input
malfunction
T
107
I

74

ON-BOARD
DIAGNOSTICS
II
SYSTEM
(T11,01
2-7

11
.
Diagnostics
Chart
with
Trouble
Code

Engine
coolant
temperature
sensor

I
:
DTC
P0125

-
INSUFFICIENT
COOLANT
TEMPERATURE

FOR
CLOSED
LOOP
FUEL
CONTROL

(TW
-
CL)
-

WIRING
DIAGRAM
:

B84
B21
E2E8

ECM

B84
B21
ES

1
2u34
U
-1
5
[
6
f
U
78
u
F
5~
55
171819
20
2122
2324
1
25
1
262728
2930
45
1
46
1
47
1
48
1
49
1
50
5152
535455
5657
7172
73
747576
77
787980
8182
83

1234

5678
9
10
1112
12

B2M0539

NOTE
:

For
the
diagnostic
procedure
on
insufficient
coolanttem-

perature
for
closed
loop
fuel
control
(DTC
P0125),
referto

2-7
[T1010]*2
.

83

2-7
[T11Po]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

11
.
Diagnostics
Chart
with
Trouble
Code

P
:
DTC
P0170

-
FUEL
TRIM
MALFUNCTION
(FUEL)
-

NOTE
:

For
the
diagnostic

(DTC
P0170),
refer

procedure
on
fueltrim
malfunction

to
2-7
[T10P0]*2
.

90

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[TylTOi
2-7

11
.
DiagnosticsChart
with
Trouble
Code

Q
:
DTC
P0201

-
FUELINJECTOR
CIRCUIT
MALFUNCTION
-

#1
(INJ1)
-

R
:
DTC
P0202

-
FUELINJECTOR
CIRCUIT
MALFUNCTION
-

#2
(INJ2)
-

S
:
DTC
P0203

-
FUELINJECTOR
CIRCUIT
MALFUNCTION
-

#3
(INJ3)
-

T
:
DTC
P0204

-
FUELINJECTOR
CIRCUIT
MALFUNCTION
-

#4
(INJ4)
-

WIRING
DIAGRAM
:

Main
relay
0
0
0-
0

B47

SBF-2
(D
e
'-`
B22
E3E6
E17884
#3#4

E5
E16

ECM
#1
#2

B84B22B41
E5E6
E16
E17

1
U
131
U1
1
3132
6
2
9
1
40
1
4
11421
43
1
44
1

1
234
10
.1
0L718

P
1
58960
63
646B6
9
1011
12
1
14116
5
1~
B
41
3,

B2M0784

NOTE
:

Forthe
diagnostic
procedure
on
fuel
injector
circuit
mal-

function
-
#1
(DTC
P0201),
#2
(DTC
P0202),
#3
(DTC

P0203)
and
#4
(DTC
P0204),
refer
to
2-7
[T10Q0,
T10R0,

T10S0
and
T10T0]*2
.

91

2-7
[T11U0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

11
.
Diagnostics
Chart
with
Trouble
Code

U
:
DTC
P0301

-
CYLINDER
1
MISFIRE
DETECTED

(MIS-1)
-

V
:
DTC
P0302

-
CYLINDER
2
MISFIRE
DETECTED

(MIS-2)
-

W
:
DTC
P0303

-
CYLINDER
3
MISFIRE
DETECTED

(MIS-3)
-

X
:
DTC
P0304

-
CYLINDER
4
MISFIRE
DETECTED

(MIS-4)
-

WIRING
DIAGRAM
:

Crankshaft
Camshaft
Main
rela
y
position
position
Mass
air
o
sensorsensor
flow
sensor
0

O
E10E15
O

B47
ECM
SBF-2

E8
B12
E13
E6
E17

#3
#4
77

Ll
-
t
:A

Engine
Neutral
Throttle
~
E16
coolant
positionposition
temperature
switch
sensor
#1#2
sensor

Fuel
injectors
1
4
10
111
1
14
1
1
1I181920
2122
23
24
25262728
29
3132
33
34353637
3940
4142
4344454647484950
5152
53545556575859
1
60
61
1
62
1
63
1
64
1
65
1
66
1
6L/
1
698
9
0
I
1111721
1741
51761771781191801811827831
8485
861$7
888990
9192
9394951961
I

B22E10E15

O
O
B12E13
B41
Efi
EI7

1234
1
2
5678
~
Et6
5678
_3
1
ill
1
2345
9101112
1
23
56
13141516
1
2
82M0791

NOTE
:

For
the
diagnostic
procedure
on
cylinder
misfire
detected

-
#1
(DTC
P0301),
#2
(DTC
P0302),
#3
(DTC
P0303)
and
#4
(DTC
P0304),
referto
2-7
[T10U0,
T10V0,
T10W0
and

T10X0]*2
.

92