1996 SUBARU LEGACY fuel pressure

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[Tiq2]
2-

1
.
General

1~
Engine
control
module
(ECM)
~
Radiator
fan

~2
Ignition
coil~s
Radiator
fan
relay

~3
Ignitqr
~s
Pressure
sources
switching
solenoid
valve

~4
Crankshaft
position
sensor
~
Knock
sensor

~5
Camshaft
position
sensor
~
Back-pressure
transducer

Throttle
position
sensor
~s
Front
oxygen
sensor

~7
duel
injectors
~o
Rear
oxygen
sensor
(Except
California
model)

~8
Pressure
regulator
~
Pressure
sensor

Engine
coolant
temperature
sensor
~z
A/C
compressor

~o
Mass
air
flow
sensor
~
Inhibitor
switch

Idle
air
control
solenoid
valve
~
CHECK
ENGINE
malfunction
indicator
lamp
(MIL)

~z
Purge
control
solenoid
valve
~
Tachometer

0
Fuel
pump
~s
A/C
relay

0
PCV
valve
~
A/C
control
module

~s
Air
cleaner
~eIgnition
switch

Canister
~
Transmission
control
module
(TCM)

~
Main
relay
~o
Vehicle
speed
sensor
2

~a
Fuel
pump
relay
~
Data
link
connector
(For
Subaru
select
monitor)

~s
Fuel
filter
@
Data
link
connector
(For
Subaru
select
monitor
and

~o
Front
catalytic
converter
OBD-II
general
scan
tool)

Rear
catalytic
converter
@
Two
way
valve

~2
MGR
valve
~a
Rear
oxygen
sensor
(California
model
only)

EGR
control
solenoid
valve
~
Filter

3

2-7
[T3C6]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

3
.
Diagnosis
System

6
.
READDATA
FUNCTION
KEY
LIST
FOR
ENGINE

Function
mode
Contents
Abbreviation
Unit
of
measure

F00
ROM
ID
number
YEAR
-

F01Battery
voltage
VB
V

F02
Vehicle
speed
signal
VSP
km/h,
MPH

F03Engine
speed
signal
EREV
rpm

F04Engine
coolant
temperature
signal
TW
°C,
°F

F05
Ignition
signal
ADVS
deg

F06
Mass
air
flow
signal
QA
g/s,
V

F07
Throttle
position
signal
THV
%,
V

FOS
Injector
pulse
width
TIM
ms

F09
Idle
air
control
signal
ISC
°/m

F10
Load
data
LOAD

F11
Front
oxygen
sensor
outputsignal
02
V

F12
Front
oxygen
sensor
maximum
and
minimum
output

signal
02max
-
min
V,
V

F13
Rear
oxygen
sensor
output
signal
R02
V

F14
Rear
oxygen
sensor
maximum
and
minimum
output

signal
R02max
-
min
V,
V

F17
Short
term
fuel
trim
ALPHA

F19
Knock
sensor
signal
KNOCK
deg

F20
Atmospheric
absolute
pressure
signal
BARD
.
P
kPa,
mmHg

F21
Intake
manifold
absolute
pressure
signal
MANi
.
P
kPa,
mmHg

F29
A/F
correction
(short
term
trim)
by
rear
oxygen
sensor
PHOS

F30
Longterm
fuel
trim
KBLRC

F31
Longterm
whole
fuel
trim
KO

F32
Front
oxygen
sensor
heater
current
F02H
A

F33
Rear
oxygen
sensor
heater
current
R02H
A

F36
Maximum
value
of
cylinder#1
misfire
times
during
100

rotations
MFi

F37
Maximum
value
of
cylinder
#2
misfire
times
during
100

rotations
MF2

F38
Maximum
value
of
cylinder
#3
misfire
times
during
100

rotations
MF3

F39
Maximum
value
of
cylinder
#4
misfire
times
during
100

rotations
MF4

F42
Maximum
and
minimum
EGR
system
pressure
value
EGRmax
-
minkPa

FAO
ON
H
OFF
signal
-
-

FA1
ON
~-->
OFF
signal
-
-

FA2
ON
H
OFF
signal
-
-

FA3
ON
H
OFF
signal
-
-

FA4
ON
H
OFF
signal
-
-

FA5
ON
H
OFF
signal
-
-

FBO
Diagnostic
trouble
code
(DTC)
INSPECT
-

18

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T3C6]
2-7
3
.
Diagnosis
System

Function
mode
Contents
Abbreviation
Unit
of
measure

FB1
Diagnostic
trouble
code
(DTC)
OBD
-

Load
data
(Freeze
frame
data)
LOAD-F

Engine
coolant
temperature
signal
(Freeze
frame
data)
TW-F
°C

Throttleposition
signal
(Freeze
frame
data)
ALPH-F

FB2
Long
term
fuel
trim
(Freeze
frame
data)
KBLR-F

Intake
manifoldabsolute
pressure
signal
(Freeze
frame

data)
MANI-F
kPa

Engine
speed
signal
(Freeze
frame
data)
EREV-F
rpm

Vehicle
speed
signal
(Freeze
frame
data)
VSP-F
km/h

Mass
air
flow
signal
(Freeze
frame
data)
QA-F
(P0100)
V

Pressure
signal
(Freeze
frame
data)
PS-F
(P0105)
V

Pressure
signal
(Freeze
frame
data)
PR-F
(P0106)
V

Engine
coolant
temperature
signal
(Freeze
frame
data)
TW-F
(P0115)
V

Throttleposition
signal
(Freeze
frame
data)
THV-F
(P0120)
V

17133
EGR
control
solenoid
valve
signal
(Freeze
frame
data)
EGR
(P0403)
-*1

Purge
control
solenoid
valve
signal
(Freeze
frame
data)
CPC
(P0443)
_*1

Start
switch
signal
(Freeze
frame
data)
STSW
(P1100)
_*1

Pressure
sources
switching
solenoid
valve
signal

(Freeze
frame
data)
gR1
(P1102)
_*1

Radiator
fanrelay
1
signal
(Freeze
frame
data)
FAN1
(P1500)
_*1

FCO
Clear
memory
-
-

FD01
Compulsory
fuel
pump
relay
operation
check
FUEL
PUMP
-

FD02
Compulsory
purge
control
solenoid
valveoperation

check
CPCSOL
-

FD03
Compulsory
radiator
fan
relay
operation
check
RAD
FAN
-

FD04
Compulsory
A/C
relay
operation
check
A/C
RELAY
-

FD05
Compulsory
EGR
control
solenoid
valve
operation

check
EGR
SOL
-

FD10
Compulsory
pressure
sources
switching
solenoid
valve

operation
check
BR
SOS
-

NOTE
:

1)
Subaru
select
monitor
is
also
available
for
monitoring

information
other
than
that
used
for
check
and
repair
of

the
vehicle
.

2)
F42
(Maximumandminimum
EGR
system
pressure

value)
will
not
read
accurately
until
the
EGR
flow
diagno-

sis
terminates
.

EGR
flow
diagnosis
terminates
when
LED
No
.
2
illuminates

at
function
mode
FA4
.

3)*1
:
"Hi"or
"Low"
is
shown
instead
of
measured
value
.

4)
Because
valve
is
not
installed,
FD06,
FD07,FD08,
FD09

and
FD11
will
be
displayed
but
non-functional
.

19

2-7
[T3C24]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

3
.
Diagnosis
System

BARO
.P
(F20)

1
0
OkPa752mmHg

82M0755

MAN
I
.
P
(F21)

2
9kPa218mmHg

82M0756

PHOS
(
F29
)

0
.78

B2M0494

KBLRC
(F30)

5
.5

B2M0495

KO
(F31
)

B2M0496

24
.
FUNCTION
MODE
:
F20

-
ATMOSPHERICABSOLUTE
PRESSURE
SIGNAL

(BARD
.
P)
-

*
Atmospheric
absolutepressure
is
indicated
in
"kPa"

and
"mmHg"
at
the
same
time
.

25
.
FUNCTION
MODE
:
F21

-
INTAKE
MANIFOLD
ABSOLUTE
PRESSURE
SIGNAL

(MANI
.
P)
-

e
Intake
manifoldabsolutepressure
is
indicated
in
"kPa"

and
"mmHg"
at
the
same
time
.

26
.
FUNCTION
MODE
:
F29

-
A/F
CORRECTION
COEFFICIENT
[SHORT
TERM

TRIM]
BY
REAR
OXYGENSENSOR
(PHOS)
-

27
.
FUNCTION
MODE
:
F30

-
LONGTERM
FUELTRIM
[A/F
LEARNING

CORRECTION
COEFFICIENT]
(KBLRC)
-

28
.
FUNCTION
MODE
:
F31

-
LONGTERM
FUEL
TRIM
WHOLE
[A/F
LEARNING

CONTROL
COEFFICIENT]
(KO)
-

24

ON-BOARD
DIAGNOSTICS
II
SYSTEM
ITscas1
2-7

3
.
Diagnosis
System

36
.
FA
MODE
FOR
ENGINE

Function

mode
LED
No
.
Contents
Display
LED
"ON"
requirements

3Neutral
switch
NT
When
neutralposition
signal
is
entered
.

7Test
mode
connector
UD
When
test
mode
connector
is
connected
.
FAO
8
AT/MT
identification
signal
AT
When
AT
identification
signal
is
entered
.

9
Ignition
switchIG
When
ignition
switch
is
turned
ON
.
1
Radiator
fan
relay
2
R2
When
radiator
fanrelay2
isin
function
.

2
Knock
signal
KS
When
knock
signal
is
entered
.

3
Purge
control
solenoid
valve
CNWhen
purge
control
solenoid
valve
is
in
func-

tion
.
FA1
4Fuel
pump
relay
FP
When
fuel
pump
relay
isin
function
.

6
Radiator
fanrelay
1
R1
When
radiator
fanrelay
1
isin
function
.

7
Air
conditioner
relay
ARWhen
air
conditioner
relay
isin
function
.

8
Air
conditioner
switch
ACWhen
air
conditioner
switch
is
turned
ON
.

2
AEC
signal
ECWhen
AEC
signal
is
entered
.

3
EAM
signal
AM
When
EAM
signal
is
gone
out
.

FA2
4
AEB
signal
EB
When
AEB
signal
is
entered
.

6
AET
signal
ET
When
AET
signal
is
entered
.

7
Engine
torque
control
signal
TR
When
engine
torque
control
signal
is
entered
.

FA3
7
Pressure
sources
switching
solenoid
valve
BR
When
pressure
sources
switching
solenoid

valve
is
in
function
.

1
Catalyst
CA
When
diagnosis
of
catalyzer
is
finished
.

2
EGR
system
E1
When
diagnosis
of
EGR
system
is
finished
.

FA4
3
California
model
identification
signal
FC
When
California
model
identification
signal
is

entered
.

8
Rear
oxygen
sensor
signal
OR
When
rear
oxygen
sensor
mixture
ratio
is
rich
.

9Front
oxygen
sensor
signal
02
When
front
oxygen
sensor
mixture
ratio
is

rich
.

FA5
7
EGR
solenoid
valve
ER
When
EGR
solenoid
valve
is
in
function
.

27

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[T3C45]
2-7

3
.
Diagnosis
System

43
.
FB
MODE
FOR
ENGINE

Function
mode
AbbreviationContentsContents
of
display
Page

On-board
diagnostics
Current
trouble
code
indicated
by

FBOINSPECT
(Inspection)
on-board
diagnostics
after
clear
mem-
[T3E1]*2

ory
.

FB1
OBD
On-board
diagnostics
Current
trouble
code
indicated
by
14
(Read
data)
on-board
diagnostics
.

LOAD-F
Load
data

TW-F
Engine
coolant
temper-

aturesignal

ALPH-F
Throttleposition
signal
*
Freeze
frame
data

FB2
KBLR-F
Long
term
fuel
trim
*
Data
stored
at
the
time
of
trouble
15

Intake
manifold
abso-
occurrence,
is
shownon
display
.
MANI-F
lute
pressure
signal

EREV-F
Engine
speed
signal

VSP-F
Vehicle
speed
signal

QA-F
(P0100)
Mass
air
flow
signal

PS-F
(P0105)
Pressure
signal

PR-F
(P0106)
Pressure
signal

TW-r
(P0115)
Engine
coolant
temper-

ature
signal

THV-F
(P0120)
Throttleposition
signal

EGR
(P0403)
EGR
control
solenoid
,
Freeze
frame
data

FB3
valve
signal
9
Data
stored
at
the
time
of
trouble16

CPC
(P0443)
Purge
control
solenoid
occurrence,
is
shown
on
display
.
valve
signal

STSW
(P1100)
Start
switch
signal

Pressure
sources

BR1
(P1102)
switching
solenoid

valve
signal

FAN1
(P1500)
Radiator
fan
relay
1

signal

44
.
FC
MODE
FOR
ENGINE

Function
mode
Abbreviation
ContentsContents
of
display
Page

FCO
MEMORY
CLR
Back-up
memory
clear
Function
of
clearing
trouble
code
[T3D1]*2
stored
in
memory
.

45
.
FD
MODE
FOR
ENGINE

Function
mode
Abbreviation
ContentsContents
of
display
Page

FD01
FUEL
PUMP

FD02
CPCSOL
Function
of
checking
operation
offuel

FD03
RAD
FAN
Compulsory
valve
pump
relay,
purge
control
solenoid

A/C
ll
di
tf
l
39
FD04
A/C
RELAY
operation
check
an
re
revave,
ra
a
or
ay,
ay,

EGR
control
solenoid
valve
and
pres-

FD05
EGR
SOL
sure
sources
switching
valve
.

FD10
BR
SOL

NOTE
:

Because
valve
is
not
installed,
FD06,
FD07,
FD08,
FD09
and
FD11
will
be
displayed
but
non-functional
.

31

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

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