1996 SUBARU LEGACY Chassis

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
[-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
11
SYSTEM
[TIoBwB]
2-7
10
.
DiagnosticsChart
with
Trouble
Code

R58

B2M0938A
I

R58

B2M0939A
I

10BW7
CHECK

I
SENSOR
.

ROUND
CIRCUIT
OF
FUEL
LEVEL

Measure
resistance
of
harness
between
fuel
pump
con-

nector
and
chassis
ground
.

CHECK
:
Connector
&
terminal
(R58)
No
.
5
-
Chassis
ground
:

Is
the
resistance
less
than
5
92?

YES
:
Go
to
step
10BW8
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

9
Open
circuit
in
harness
between
fuel
pump
connector

and
chassis
grounding
terminal

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
coupling
connectors
(R57,
B97and

B22)

1OBW8
CHECK
HARNESS

(FUEL
PUMP
CONNECTOREN

ECM
AND

1)
Connect
connector
to
fuel
sub
meter
unit
.

2)
Turn
ignition
switch
to
ON
.

3)
Measure
voltage
between
fuel
pump
connector
and

chassis
ground
.

CHECK
:
Connector
&
terminal
(R58)
No
.
3
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
less
than
1
V?

Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

*
Open
circuit
in
harness
between
fuel
pump
connector

and
junction
A
on
rear
wiring
harness

"
Poor
contact
in
fuel
sub
meter
unit
connector

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
coupling
connector
(R57)

No
:
Go
to
nextstep
4)

51

2-7
[T10BW9]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

'-
'lam

o
-
-

-`
=1~\
~--
~
~
o

(D
--

.
G2M0340

R58

B2M0940A
I

4)
Turn
ignition
switch
to
OFF
.

5)
Disconnect
connector
from
ECM
.

6)
Turn
ignition
switch
to
ON
.

7)
Measure
voltage
between
ECM
connector
and
chassis

ground
.

CHECK
:
Connector
&
terminal

(B84)
No
.
27
(+)
-
Chassis
ground
:

Is
thevoltage
less
than
1
V?

vES
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

9
Open
circuit
in
harness
between
ECM
connector
and

junction
A
on
rear
wiring
harness

9
Poor
contact
in
coupling
connector
(B97)

No
:
Repair
connector
.

NOTE
:

In
this
case,
repairthe
following
:

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
fuel
sub
meter
unit

"
Poor
contact
in
ECM
connector

CHECK
HARNESSBETWEEN
ECM,
COMBI-

10BW9
NATION
METER
AND
FUEL
PUMP
CONNEC-

TOR
.

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
of
harness
between
fuel
pump

connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal
(R58)
No
.
3
-
Chassis
ground
:

Is
the
resistance
less
than10
S2?

vES
:
Go
to
nextstep
5)
.

No
:
Go
to
step
10BW10
.

5)
Remove
service
hole
cover
located
on
the
left
rear
of

luggage
compartment
floor
.

52

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TIoBw9]
2-7

10
.
DiagnosticsChart
with
Trouble
Code

R58

B2M0940A
I

R59

82M0941A
I

R15

B2M0942A
I

6)
Disconnect
connector
from
fuel
sub
meter
unit
.

7)
Measure
resistance
of
harness
between
fuel
pump

connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R58)
No
.
3
-
Chassis
ground
:

Is
the
resistance
less
than
10
92?

YES
:
Repair
short
circuit
in
harness
between
fuel
pump

and
fuel
sub
meter
unit
connector
.

No
:
Go
to
nextstep
8)
.

8)
Separate
fuel
tank
cord
connector
(R57)
and
rear
wir-

ing
harness
connector
(R15)
.

9)
Measure
resistance
of
harness
between
fuel
sub
meter

unit
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R59)
No
.
1
-
Chassis
ground
:

Is
the
resistance
less
than10
S2?

,rES
:
Repair
short
circuit
in
fuel
tankcord
.

No
:
Go
to
nextstep
10)
.

10)
Separate
rear
wiring
harness
connector
(R1)
and

bulkhead
wiring
harness
connector
(B97)
.

11)
Measure
resistance
of
harness
between
rear
wiring

harnessconnector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R15)
No
.
3
-
Chassis
ground
:

Is
the
resistance
less
than10
0?

,rES
:
Repair
short
circuit
in
rear
wiring
harness
.

No
:
Go
to
nextstep
12)
.

12)
Measure
resistance
of
harness
between
bulkhead
wir-

ing
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(B97)
No
.
J2
-
Chassis
ground
:

Is
the
resistance
less
than10
S2?

,rES
:
Go
to
nextstep
13)
.

No
:
Repair
short
circuit

and
ECM
connector
.

in
harness
between
S
.M
.J
.

13)
Separate
bulkhead
wiring
harness
connector
(B38)

and
instrument
panel
wiring
harness
connector
(i3)
.

14)
Measure
resistance
of
harness
between
bulkhead
wir-

ing
harness
connector
and
chassis
ground
.

CHECK
;
Connector
&
terminal

(B97)
No
.
J2
-
Chassis
ground
:

Is
the
resistance
less
than10
SZ?

vES
:
Repair
short
circuit
in
bulkhead
wiring
harness
.

No
:
Repair
short
circuit
in
instrument
panel
wiring

harness
.

53

2-7
frioBwio]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

10BW10
I
CHECK
HARNESSBETWEEN
COMBINATION

METER
AND
FUEL
PUMP
CONNECTOR
.

1)
Connect
connector
tofuel
pump
.

2)
Pull
out
combination
meterfrom
instrument
panel
.

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

3)
Disconnect
connector
from
combination
meter
.

4)
Measure
resistanceof
harness
between
combination

meter
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(i10)
No
.
3
-
Chassis
ground
:

Is
the
resistance
less
than
200
SZ?

Go
to
step
10BW11
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

Open
circuit
in
harness
between
combination
meter

connector
and
junction
A
on
rearwiring
harness

*
Poor
contact
in
coupling
connectors
(i3
and
1397)

10BW11
I
CHECK
COMBINATION
METER
.

1)
Disconnect
speedometer
cablefrom
combination

meter
and
remove
combination
meter
.

CHECK
:
Is
the
fuel
meter
installation
screw
tightened

securely?

,rES
:
Go
to
nextstep
2)
.

No
:
Tighten
fuel
meter
installation
screw
securely
.

2)
Remove
printed
circuit
plate
assemblyfrom
combina-

tion
meter
assembly
.

CHECK
:
Is
there
flaw
or
burning
on
printed
circuit

plate
assembly?

YES
:
Replace
printed
circuit
plate
assembly
.

No
:
Replace
fuel
meter
assembly
.

54