SUBARU LEGACY 1996 Service Repair Manual

2_7
[T10BU1]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

lTl_~l
~141
~112llljl
1
9
41!1!_441
~T913
2
31

l96l95l94P3P2P=188
U

1
A~

F-1

E)
H2M14088

2
1
ni
.

_,0Q0-j

B2M09291

II-013-M,
I
CHECK
OUTPUT
SIGNAL
FROM
ECM
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
ECM
and
chassis
ground
.

CHECK
:
Connector&
terminal

(B84)
No
.
10
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
more
than10
V?

0
:
Go
to
step
10BU2
.

No
:
Go
to
step
10BU3
.

CHECK
HARNESS
BETWEEN
FUEL
TANK
10BU2
PRESSURE
CONTROL
SOLENOID
VALVE

ANDECM
CONNECTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
fuel
tank
pressure
control

solenoid
valve
.

3)
Turn
ignition
switch
to
ON
.

4)
Measure
voltage
between
ECM
and
chassis
ground
.

CHECK
:
Connector
&
terminal
(884)
No
.
10
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
more
than10
V?

,rES
;
Repair
short
circuit
in
harness
and
replace
ECM
.

NOTE=

The
harness
between
ECM
and
fuel
tank
pressure
control

solenoid
valve
is
in
short
circuit
.

No
:
Go
to
nextstep
5)
.

5)
Turn
ignition
switch
to
OFF
.

6)
Measure
resistance
between
fuel
tank
pressure
control

solenoid
valve
terminals
.

CHECK
:
Terminals

No
.
1
-
No
.
2
:

Is
the
resistance
less
than
1
S2?

Replace
fuel
tankpressure
control
solenoid
valve

and
ECM
.

Go
to
next
CHECK
CHECK
:
Is
there
poor
contact
in
ECM
connector?

Repair
poor
contact
in
ECM
connector
.

No
:
Replace
ECM
.

40

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T10BU4]
2-7
10
.
Diagnostics
Chart
with
Trouble
Code

R68

D

82M0930A
I

2
1

D

S2

B2M0929
I

CHECK
HARNESSBETWEEN
FUEL
TANK

10BU3
PRESSURE
CONTROL
SOLENOID
VALVE

AND
ECM
CONNECTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connectors
from
fuel
tankpressure
control

solenoid
valve
and
ECM
.

3)
Measure
resistance
of
harness
between
fuel
tank
pres-

sure
control
solenoid
valve
connector
and
chassis

ground
.

CHECK
:
Connector
&
terminal

(R68)
No
.
2
-
Chassis
ground
:

Is
the
resistance
less
than
10
S2?

,rES
;
Repair
short
circuit
in
harness
between
ECM
and

fuel
tank
pressure
control
solenoid
valve
connec-

tor
.

No
:
Go
to
nextstep
4)
.

4)
Measure
resistance
of
harness
between
ECM
and
fuel

tank
pressure
control
solenoid
valve
connector
.

CHECK
:
Connector&
terminal

(B84)
No
.
10
-
(R68)
No
.
2
:

Is
the
voltage
less
than
1
SZ?

,res
:
Go
tostep
10BU4
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

*
Open
circuit
in
harness
between
ECM
and
fuel
tank

pressure
control
solenoid
valve
connector

e
Poor
contact
in
coupling
connectors
(B97
and
R57)

PRESSURE
CONTROL
10BU4
CHECK
FUEL
I
SOLENOIDVALVE
.

Measure
resistance
between
fuel
tank
pressure
control

solenoid
valve
terminals
.

CHECK
:
Terminals

No
.
1
-
No
.
2
:

Is
the
resistance
between
10
and
100
S2?

YES
:
Go
to
step
10BU5
.

No
:
Replace
fuel
tank
pressure
control
solenoid
valve
.

41

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

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

10
.
Diagnostics
Chart
with
Trouble
Code

Test
mode
connector

B2M04328

10BV1
I
CHECK
FUEL
TANK
PRESSURE
CONTROL

SOLENOID
VALVE
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
test
mode
connector
.

3)
Turn
ignition
switch
to
ON
.

CHECK
:
Does
fuel
tank
pressure
control
solenoid

valve
produce
operating
sound?

NOTE
:

Fuel
tank
pressure
control
solenoid
valve
operation
check

can
also
be
executed
using
Subaru
Select
Monitor
(Func-

tion
mode
:
FD07)
.
For
the
procedure,
refer
to
"COMPUL-

SORY
VALVE
OPERATION
CHECK
MODE"
2-7
[T3F0]*4
.

vES
:
Check
evaporative
emission
control
system
.

<
Ref
.
to
2-7
[T10BQ0]
.*7
>

No
:
Replace
fuel
tank
pressure
control
solenoid
valve
.

45

2_7
[T10BW0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P1402


H2M1411

BW
:
DTC
P1402

-
FUEL
LEVEL
SENSOR
CIRCUIT

MALFUNCTION
(FLVL)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

108W1
Checkspeedometer
and
tachometer

operation
in
combination
meter
.

Check
ground
circuit
of
combination

meter
.

108W3

Check
inputsignal
for
ECM
.
(Using

voltage
meter
andSubaru
Select

Monitor
.)

10BW4
Check
fuel
level
sensor
.

10BW5
Check
fuel
sub
level
sensor
.

10BW6
Check
harness
between
fuel
pump
and

fuel
sub
meter
unit
connector
.

10BW7
Check
ground
circuit
of
fuel
level
sensor
.

Check
harnessbetween
ECM
and
fuel

pump
connector
.

10BW9

Check
harnessbetween
ECM,

combination
meter
and
fuel
pump

connector
.

10BW10
Check
harness
between
combination

meter
and
fuel
pump
connector
.

108W11
Check
combination
meter
.

CAUTION
:

After
repair
or
replacement
of
faulty
parts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

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

46

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TloBw2i
2-7
10
.
Diagnostics
Chart
with
Trouble
Code

WIRING
DIAGRAM
:

a
:
QD
Combination
b
:
i12
meter
Ignition
c
:
i14
No
.
15W2
switch
SBF-4
FL1
.25B

Fuel
gauge

S
.M
.J
.

O
O
E
E)
El)

Fuel
pumpASSY

R58
Fuel
level
sensor

Junction
A

R15R57

ECM
~
Fuel
sub
meter
unit

Fuel
sub
O
~p
level
sensor

E

822

R57
872
R59

1
5
1
6
1
7
1
8
'
,

O
,'
IyWJJ
LJJJ
LJJ

u
4u
1Ju
i10
i~2
117118119~2
.0121122123V4
.
.
.
.
.
.
(D

1
1
1
141
141EIb1

B2M1021

CHECK
SPEEDOMETER
AND
TACHOMETER

(OPERATION
IN
COMBINATION
METER
.

CHECK
:
Does
speedometer
and
tachometer
operate

normally?

vES
:
Go
to
step
10BW3
.

No
:
Go
to
step
10BW2
.

10BW2
I
CHECK
GROUND
CIRCUIT
OFCOMBINA-

TION
METER
.

1)
Turn
ignition
switch
to
OFF
.

2)
Pull
out
combination
meter
from
instrument
panel
.

<
Ref
.
to
6-2
[W13A1
]
.*1
>

3)
Disconnect
connector
from
combination
meter
.

47

2-7
[-riosw3]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code

i12

1
1
2
1
3
1
4
1
5
1
6
1
789
011
213
4
516

D

[
.0
S2
0i

B2M0934A
I

u
8
7
u
65u
43u21
22
7
52
~
2121
~1
1
91
1
4
1
4
55
:1
B84
15
q
4
4
48
"§~
5
881
i
81771
70
7
51
74
17317217
1
1

D

+v-
H2M1414B

4)
Measure
resistance
of
harness
between
combination

meter
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(i12)
No
.
1
-
Chassis
ground
:

Is
resistance
less
than5
0?

,rEg
:
Repair
or
replace
combinationmeter
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

Open
circuit
in
harness
between
combination
meter

connector
and
grounding
terminal

"
Poor
contact
in
combination
meter
connector

"
Poor
contact
in
grounding
terminal

CHECK
INPUT
SIGNAL
FOR
ECM
.
(USING
10BW3
VOLTAGE
METER
AND
SUBARU
SELECT

MONITOR
.)

1
Turn
ignition
switch
t
o
ON
.
(Engine
OFF)

2)
Measure
voltage
between
ECM
connector
and
chassis

ground
.

CHECK
:
Connector
&
terminal

(884)
No
.
27
(+)
-
Chassis
ground
(
)
:

is
thevoltage
more
than4
.75
V?

,rES
:
Go
to
step
10BW4
.

No
:
Go
to
next
step
3)
.

3)
Measure
voltage
between
ECM
connector
and
chassis

ground
.

CHECK
:
Connector
&
terminal

(884)
No
.
27
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
less
than0
.12
V?

,res
:
Go
to
step
lOBW9
.

No
:
Go
to
next
CHECK

48

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[r1oBwa]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

FLEVEL
(F45)

2
.50V

H2M1327

3
2
1
5
4

D

S2

B2M0935
I

CHECK
:
Does
the
value
change
less
than
0
.12
Vby

shaking
harness
and
connector
of
ECM
while

monitoring
the
value
with
Subaru
Select

Monitor?

9
Subaru
Select
Monitor
Designate
mode
using
function
key
.

Function
mode
:
F45

9
F45
:
Fuel
level
sensor
output
signal
is
indicated
.

,rES
:
Repair
poor
contact
in
ECM
connector
.

No
:
Even
if
MIL
lights
up,
the
circuit
has
returned
to

a
normal
condition
at
this
time
.
A
temporary
poor

contact
of
the
connector
may
be
the
cause
.

NOTE
:

In
this
case,
repair
the
following
:

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
combination
meter
connector

"
Poor
contact
in
ECM
connector

"
Poor
contact
in
coupling
connector
(i3,
1322,
B97and

R57)

10BW4
CHECK
FUEL
LEVEL
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
fuel
pump
access
hole
lid
located
on
the
right

rear
of
luggage
compartment
floor
.

3)
Disconnect
connector
from
fuel
pump
.

4)
Measure
resistance
between
connector
terminals
of
fuel
pump
.

CHECK
:
Terminals

No
.
3
-
No
.
5
:

Is
the
resistance
less
than
100
S2?

vES
:
Go
to
step
10BW5
.

No
:
Replace
fuel
sending
unit
.

49

2-7
[T10BW5]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

[2-
1

B2MO9361

R
1
2
34
5

.0
Q
0
.

B2MO937A

I
10BW5
CHECK
FUEL
SUB
LEVEL
SENSOR
.

1)
Remove
service
hole
cover
located
on
the
left
rear
of

luggage
compartment
floor
.

2)
Disconnect
connector
from
fuel
sub
meter
unit
.

3)
Measure
resistance
between
connector
terminals
of
fuel
sub
meter
unit
.

CHECK
;
Terminals

No
.
1
-
No
.
2
:

Is
the
resistance
less
than
100
SZ?

,rES
:
Go
to
step
10BW6
.

No
:
Replace
fuel
sub
meter
unit
.

10BW6
CHECK
HARNESS
FUEL
PUMP
I
I
AND
FUEL
SUB
MET
RWUNIT
CONNECTOR
.

Measure
resistance
of
harness
between
fuel
pump
and

fuel
sub
meter
unit
connector
.

CHECK
:
Connector
&
terminal

(R58)
No
.
3
-
(R59)
No
.
2
:

Is
the
resistance
less
than
1
SZ?

0
:
Go
to
step
10BW7
.

No
:
Repair
open
circuit
in
harness
between
fuel
pump

and
fuel
sub
meter
unit
connector
.

50