1996 SUBARU LEGACY coolant temperature

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
[T2A2]
ON-BOARD
DIAGNOSTICS
11
SYSTEM

2
.
Electrical
Components
Location

2
.
Electrical
Components
Location

A
:
ENGINE

2
.
SENSOR

OBD0009A

1~
Pressure
sensor
~5
Knock
sensor

~2
Mass
air
flow
sensor
~s
Camshaft
position
sensor
~3
Engine
coolant
temperature
sensor
07
Crankshaft
position
sensor
~4
Throttleposition
sensor

4

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

[T3C13]
2-7
ON-BOARD
DIAGNOSTICS
II
SYSTEM

3
.
Diagnosis
System

VSP
(F02)

24km/
h
15MPH

B2M0754

EREV
(F03
)

1500
rpm

B2M0478

TW
(F04)

800C
176
°
F

B2M0479

ADVS
(F05
)

15
deg

B2M0480

QA
(
F06
)
1
.
67g
l
s
2
.
02V

82M0481

9
.
FUNCTION
MODE
:
F02

-
VEHICLE
SPEED
SIGNAL
(VSP)
-

9
Vehicle
speed
is
indicated
in
kilometerper
hour
(km/h)

and
mile
per
hour
(MPH)
at
the
same
time
.

10
.
FUNCTION
MODE
:
F03

-
ENGINE
SPEED
SIGNAL
(EREV)
-

11
.
FUNCTION
MODE
:
F04

-
ENGINE
COOLANT
TEMPERATURE
SIGNAL
(TW)
-

~
Engine
coolant
temperature
is
indicated
in
"°C"
and

"°F"
at
the
same
time
.

12
.
FUNCTION
MODE
:
F05

-
IGNITION
SIGNAL
(ADVS)
-

NOTE
:

The
ignition
timing
value
displayed
in
mode
F05
is
a
value

computed
by
ECM
and
will
not
alwayscorrespond
with
the

value
measured
with
a
timing
light
.

13
.
FUNCTION
MODE
:
F06

-
MASS
AIR
FLOW
SIGNAL
(QA)
-

Mass
air
flow
and
voltage
input
from
mass
air
flow

sensorare
shown
on
display
at
the
same
time
.

21

2_7
[T501]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

5
.
Specified
Data

5
.
Specified
Data

1
.
ENGINE
CONTROLMODULE
(ECM)
I/O
SIGNAL

++u++u++u++u
++~~
++++

1
1
0

to
B84

9
11
1
8
1
7
11
6
1
5
1
1
4
1
3
1
U

44
4
8
7
7525B8584
161
u1
1

4443~
2
~
$Q
7$
9
~
8~
7
~

u
1
11
u
1
9
u

7
33
3231

6~
5
1

u
8
7

322

7
u
6
5
2222

43251
0
u

2

4
32
1

2121
11

6

OBD0092A

Signal
(V)

Content
Connector
Terminal
Ignition
SW
ON
Note
No
.
No
.
Engine
ON
(Idling)
(Engine
OFF)

Crankshaft
Signal
(+)884
8
0
-7-
+7
Sensor
output
waveform

position
Signal
(-)
B84
29
00
-

sensor
Shield
B84
54
00
-

Camshaft
Signal
(+)B84
70
-7-
+7
Sensor
output
waveform

position
Signal
(-)
B84
28
0
0
-

sensor
Shield
B84
5400
-

Mass
air
Signal
B84
5
0-0
.3
0
.8-
1.2
-

flow
Shield
B84
5700
-

sensor
GND
B84
2000
-

Fully
closed
:
0
.2
-
1
.0

Throttle
Signal
B84
6
Fully
opened
:
4
.2
-
4
.7

position
Power
B84
21
55
-
sensor
supply

GND
B84
2000
-

Front
Signal
B84
230
0-0
.9
-
oxygen

sensor
Shield
B84
56
00
-

Rear
Signal
B84
240
0-0
.9
-
oxygen

sensor
Shield
B84
56
0
0
-

Engine
coolant
BS4
22
1
.0-1
.41
.0-1
.4
After
warm-up
re
sensor
temperature

"5"
and
"0"
are
repeatedly
speed
sensor
B84
830or50or5
displayed
when
vehicle
is

driven
.

165
u
1
1
u
2
11
uuuuu2
1

7
3
333
31
3
2
2
22
2
2
2
2
21
1
1
1
7
4
2
1

44

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

6
.
Wiring
Diagram
and
Wiring
Harness

Engine
Shield
Boost
Throttle
coolant
joint
sensorposition
Knock
temperature
E
.G.R
.
connector
sensor
sensor
sensor
solenoid

BB3
FF
R
I
B2
H
I
(
:
P
P
(:
9
)
PEE
(
ED
EH
(
9
)

....

E2

821

Ref
.
toAT
control
system
.

Enginecontro
I
B84
module

....

822

E3

B3

Mess
air
flowsensor

.
.
..
..
..
III

(Ca
I
(forn
(a
mode
I)
arri

813
m
EE

Ignitor
O

(Brown)
El8
E8
(Brown)
(B
I
eck)
B2
El3
(Brown)

12
123

B3
(Grey)(
ED
(Grey)

1234
123456

52

Ell
(Gray)

123

B2l
(L
i
ght
gray)

1234
5678
910U12

Ell

Ignition
coil

B83

1234

B22
CL
i
ght
gray)

1234
5678
9
1011
12
13141516

BUR10-02C

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