1996 SUBARU LEGACY relay

2_7
[T1oBUS1
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

R68

B2M0932A
I

10BU5
I
PRESSURE
CONTROL
SOLENOID
VALVE
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
fuel
tankpressure
control

solenoid
valve
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R68)
No
.
1
(+)
-
Chassis
ground
(
)
:

Is
the
voltage
more
than
10
V?

,res
:
Go
tonext
CHECK

o
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

9
Open
circuit
in
harness
between
main
relay
and
fuel

tankpressure
control
solenoid
valve
connector

"
Poor
contact
in
coupling
connectors
(B97
and
R57)

"
Poor
contact
in
main
relay
connector

CHECK
:
Is
there
poor
contact
in
fuel
tank
pressure

control
solenoid
valve
connector?

,res
:
Repair
poor
contact
in
fuel
tank
pressure
control

solenoid
valve
connector
.

No
:
Contact
with
SOA
service
.

NOTE
:

Inspection
by
DTM
is
required,
because
probable
cause
is

deterioration
of
multiple
parts
.

42

2-7
[T1
oBVO1
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P1401

H21
M1410

BV
:
DTC
P1401

-
FUEL
TANK
PRESSURE
CONTROL
SYSTEM

FUNCTION
PROBLEM
(PCV
-
F)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

10BV1
Check
fuel
tank
pressure
control

solenoid
valve
.

CAUTION
:

After
repair
or
replacement
of
faulty
parts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

<
Ref
.
to
2-7
[T3D0]
and
[T3E0]
.*2
and
*4
>

WIRING
DIAGRAM
:

Main
relay
0

0

01F
B47861F45
SBF-2
B84

E
E)E)
ECM

ra

Ti

S
.M
.J
.
891
Rt
R15
R57R68
Fuel
tankpressure
control
solenoid
valve

847
R57R68

10
U
1112
U
131401
16

1
131
1
4041424344
1
2
960
6162
63
64
6
-769
69
70
34
1~,~y(3~
8
.04
687
8
99091929
949
96
6
14j5jti1/LtiJ

B2M1020

44

6-3
IDso21
WIRING
DIAGRAM

6
.
Wiring
Diagram

6
.
Wiring
Diagram

2
.
GROUND
DISTRIBUTION

i26
Radio
Front
turn
signal
F3

and
sidemarker
z
light
RH

Cigarette
lighter
8~7
Mode
Flb
~
actuator

Subfan
motor
i
GR

f17

Main
fan
motor
11

Front
turn
signs
F~
and
sidemarker
light
LH

Turn
&
hazard
B32

module

Power
wind
relay

AT
shift
lock
control
module

B64
Seat
belt
timer[5
:ji

D66
Bleck>

2

(Brown)
i19
i1B

(B
I
e
C
K)
843

1
2
3456

B57
(g
I
ac
k)

123456
71319461111121

13

'D
2
box
iiio1vuemination
light
=
0
1
agnos
1
a
---B=
term
!
na
I

CD
E
T
B
Fan
switch

GB-7
L
+~
~
3
(9)Illumination
control
module

i
17
s
Mode
control
a
panel
-
om
FGS
L
O
oc
~
B71
3
e
Comb
i
nat
i
on

i18
C~'
sw
i
tch

Rear
defoggro0
switch

870
e
Combination
a
Cruise
control`-'switch
main
switch

b
:
i12
Combination
meter
emote
control
~
830
Combination
rearview
mirror
,
,switch
"J
switch

m
B39
B47
Mainrela
y

(B
r
own>

(B
r
own)
(~D(B
I
ack)

F1721
123
F1
f2T3-1
F1
r2
M
G31
M-
4
MS6
141516

(~~
(Brown)
(D

j

24
3
q
S6
1
23
F45T6
7
1
234
S678
PM
1
2
30
78

CD
(~D(Light
gray)
ill
Bleck>
F45
i4
(Blue)

123
456
12345678
234
6789
1
~~
7891011121314
12345678910111213141516
910111213141516
11
(21314151617181920

BUR04-03A

2

6-3
IDso1a1
WIRING
DIAGRAM

6
.
Wiring
Diagram

R57R15

Combination
meter
To
Power
Supply
Routing

FB-20
MB-3FB-4
ST
FB-22Check
Tachometer
connector
FUSE
Na
15
S8F-2
FUSE
Na
16
[G
519
FUSE
Na
l5
P
v

1-0
B79
CD
:
bm
rI
a
m

~
~
F45
Malfunction
Q
D
:
C

indicator
,
.
862
lamp
7

Speedometer
B
i
circuit

I11

*c~
)
Main
relay
E

o
B47
=
Twisted
wire

=2
R
0
F-0
0-
<
71

846
E

Fuel
pump
relay
"
>-
3z
M
~`
LL
J
C
A
V
mJ
(7

Fue
I
pump
&
~
MM~mVPPP
-+
fuel
gauge
module
~
Jv
Fue
I
S
.
M
.
J
.
mJ
B97
3
Engine
pump
[Refer'
to
a
1,
B17
control
B84
module
foldout
page
.],
JJ
Rl
~/
m
L
C

O

R

Fuel
ix
J
temperature
R67R46
sensor
u
Vehicle
=
speed
'
rr
sensor
D
Fuel
gauge
~
r
Inhibitor
switch
n

R59

Fue
I
gauge
C~
sub
module

R59
R67R68

B17

(B
lack)

12
2
12
C

i14

111213141516171819110111112113

((
9
)
5
1

F1F1
Pressure
Vent
controlcontrol
solenoid
solenoi
valvevalve

R69
OD
846
R47
(Green)

U
:Z~)
123
~
34

13
.
ENGINE
ELECTRICAL
SYSTEM

R47

F-1
Fuel
tank
d
pressure
sensor

(Brown)

M
F1F2-1

'
2
3
[3141
456
1516

(L
I
ght
gray)
i
10
(
2D
(L
i
ght
gray)

12345678910111213(41516

B12
R57B12

(Gray)

1234
12
3
5678
45678
9101112

F45
B79

(Gray)

1
23
45
67
89
IO
1t
12
1314

(2i3
(Brown)

23456789
12345
678910
1111213141516171819201
[t
1
1
12
1
13
1
14
1
15
1
16
1
17
1
18
1
19
1
20
21
1
99
1

BUR10-03A

6

Connector
Connecting
to

No
.
Pole
Color
Area
No
.
Name

R22
1
Brown
C-1
Rear
door
switch
LH

R23
6
G2
Power
antenna

R25
2
Black
C-3
Rear
defogger
condenser

R26
4
Black
D-4
Rear
combination
light
RH

R28
4
Black
C-2
Rear
combination
light
LH
R36
5
Black
C-3
Rear
wiper
relay

R37
2
C-3
D33
R38
4
G3
D34
Rear
gatecord

R39
8
C-4
D35

R47
3
I
D-3
I
Fuel
tank
pressure
sensor

Connector
Connecting
to

No
.
Pole
Color
Area
No
.
Name

D33
2
C-3
R37
D34
4C-3
R38
Rear
wiring
harness

D35
8
C-4
R39
D37
1
Black
B-3L
li
D38
1
B-3
uggage
room
ght

D39
2B-3
High-mounted
stop
light

D40
1
Black
B-4
Rear
defogger
(Power)

D42
4B-4
Rear
finisher
light
RH

D43
48-3
Rear
wiper
motor

D44
2B-4
License
plate
light
RH

D45
2A-3
License
plate
light
LH

D46
2
Black
A-4
Rear
gate
latch
switch

D47
4
A-4
Rear
gate
lock
actuator

D48
1
Black
B-3
Rear
defogger
(Ground)

D49
I
4A-3
Rear
finisher
light
LH

''
Non-colored

9
.
REAR
END
WIRING
HARNESS
AND
GROUND
POINT

1
243

B

C

C

D

B6M069

1
2
3_
I
4
13

11`~~Il'//

Connector
Connecting
to

No
.
Pole
Color
Area
No
.
Name

R22
1
Brown
C-1
Rear
door
switch
LH

R23
6
G2
Power
antenna

R25
2
Black
C-3
Rear
defogger
condenser

R26
4
Black
D-4
Rear
combination
light
RH

R28
4
Black
C-2
Rear
combination
light
LH
R36
5
Black
C-3
Rear
wiper
relay

R37
2
C-3
D33
R38
4
G3
D34
Rear
gatecord

R39
8
C-4
D35

R47
3
I
D-3
I
Fuel
tank
pressure
sensor

Connector
Connecting
to

No
.
Pole
Color
Area
No
.
Name

D33
2
C-3
R37
D34
4C-3
R38
Rear
wiring
harness

D35
8
C-4
R39
D37
1
Black
B-3L
li
D38
1
B-3
uggage
room
ght

D39
2B-3
High-mounted
stop
light

D40
1
Black
B-4
Rear
defogger
(Power)

D42
4B-4
Rear
finisher
light
RH

D43
48-3
Rear
wiper
motor

D44
2B-4
License
plate
light
RH

D45
2A-3
License
plate
light
LH

D46
2
Black
A-4
Rear
gate
latch
switch

D47
4
A-4
Rear
gate
lock
actuator

D48
1
Black
B-3
Rear
defogger
(Ground)

D49
I
4A-3
Rear
finisher
light
LH

''
Non-colored

9
.
REAR
END
WIRING
HARNESS
AND
GROUND
POINT

1
243

B

C

C

D

B6M069

1
2
3_
I
4
13

11`~~Il'//

TROUBLE
Engine will not start.
Rough idle and engine stall
Low output, hesitation and poor acceleration
Surging
Engine does not return to idle.
Dieseling (Run-on)
After burning in exhaust system
Knocking
Excessive engine oil consumption
Excessive fuel consumption Starter does not turn.
Initial combustion does not occur.
Initial combustion occurs.
Engine stalls after initial combustion.
INTAKE SYSTEM
2111 3Loosened or cracked intake air pipe
3111 3 1Loosened or cracked blow-by hose
31211 2Loosened or cracked vacuum hose
22222Defective intake manifold gasket
22222Defective throttle body gasket
322 2 2Defective PCV valve
222 323Loosened oil filler cap
3312 1Dirty air cleaner element
FUEL LINE
13 322Defective fuel pump and relay
33322Clogged fuel line
222233Lack of or insufficient fuel
BELT
222Defective
222322 22 2Defective timing
FRICTION
3Seizure of crankshaft and connecting rod bearing
3Seized camshaft
3Seized or stuck piston and cylinder
COMPRESSION
333222 23 2Defective hydraulic lash adjuster
333223 3 3Loosened spark plugs or defective gasket
333223 3 3Loosened cylinder head bolts or defective gasket
333223 2 2Improper valve seating
333333 3 13Defective valve stem
222223 3 3Worn or broken valve spring
333233 3 12Worn or stuck piston rings, cylinder and piston
222111 12 2Incorrect valve timing
222222Improper engine oil (low viscosity)
76
2-3DIAGNOSTICS
1. Engine Trouble in General

TROUBLE
Engine will not start.
Rough idle and engine stall
Low output, hesitation and poor acceleration
Surging
Engine does not return to idle.
Dieseling (Run-on)
After burning in exhaust system
Knocking
Excessive engine oil consumption
Excessive fuel consumption Starter does not turn.
Initial combustion does not occur.
Initial combustion occurs.
Engine stalls after initial combustion.
INTAKE SYSTEM
2111 3Loosened or cracked intake air pipe
3111 3 1Loosened or cracked blow-by hose
31211 2Loosened or cracked vacuum hose
22222Defective intake manifold gasket
22222Defective throttle body gasket
322 2 2Defective PCV valve
222 323Loosened oil filler cap
3312 1Dirty air cleaner element
FUEL LINE
13 322Defective fuel pump and relay
33322Clogged fuel line
222233Lack of or insufficient fuel
BELT
222Defective
222322 22 2Defective timing
FRICTION
3Seizure of crankshaft and connecting rod bearing
3Seized camshaft
3Seized or stuck piston and cylinder
COMPRESSION
333222 23 2Defective hydraulic lash adjuster
333223 3 3Loosened spark plugs or defective gasket
333223 3 3Loosened cylinder head bolts or defective gasket
333223 2 2Improper valve seating
333333 3 13Defective valve stem
222223 3 3Worn or broken valve spring
333233 3 12Worn or stuck piston rings, cylinder and piston
222111 12 2Incorrect valve timing
222222Improper engine oil (low viscosity)
76
2-3bDIAGNOSTICS
1. Engine Trouble in General