OBD port SUBARU LEGACY 1996 Service Repair Manual

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[T3C1J
2-7
3
.
Diagnosis
System

0
-
ST2

0000000000
0000000000

STi

OBD0057A

4111
o000
0000
oaoo
F[

EJ0000
0000

G3M0150I

Subaru
select
monitor

:::
o
00000
aoaoonoaoooGoou

7

B2M0829A

3
.
Diagnosis
System

C
:
SUBARU
SELECT
MONITOR

1
.
HOW
TO
USE
SUBARU
SELECT
MONITOR

1)
Prepare
Subaru
select
monitor
and
cartridge
.

ST1
498307500
SELECT
MONITOR
KIT

ST2
498345700
CARTRIDGE

2)
Turn
ignition
switch
and
Subaru
select
monitor
switch

to
OFF
.

3)
Insert
cartridge
into
Subaru
select
monitor
.

4)
Connect
Subaru
select
monitor
to
data
link
connector
.

*
Using
data
link
connector
for
Subaru
select
moni-

tor
only,
connect
Subaru
select
monitor
to
its
data
link

connector
located
in
the
lower
portion
of
the
instru-

ment
panel(on
the
driver's
side),
to
the
sideof
the

center
console
box
.

9
Using
data
link
connector
for
Subaru
select
moni-

tor
and
OBD-II
general
scan
tool
;

(1)
Connect
ST
to
Subaru
select
monitor
cable
.

ST
498357200
ADAPTER
CABLE

(2)
Open
the
cover
and
connect
Subaru
select
moni-

tor
to
data
link
connector
located
in
the
lower
portion

of
the
instrument
panel
(onthe
driver's
side),
to
the

lowercover
.

CAUTION
:

Do
not
connect
scan
tools
except
for
Subaru
select
mon-

itor
and
OBD-II
general
scan
tool
.

13

2-7
[T3E2]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
3
.
Diagnosis
System

ST2

D

00000

O

00000
00000
"
u
~O
O

r0====z3
STI

OBDO057A

E
:
INSPECTION
MODE

2
.
SUBARU
SELECT
MONITOR

After
performing
diagnostics
and
clearing
the
memory,

check
for
any
remaining
unresolved
trouble
data
.

1)
Prepare
Subaru
select
monitor
and
cartridge
.

ST1
498307500
SELECT
MONITOR
KIT

ST2
498345700
CARTRIDGE

2)
Turn
ignition
switch
andSubaru
select
monitor
switch

to
OFF
.

3)
Insert
cartridge
into
Subaru
select
monitor
.

1

0

C,
00~~
F
0000
E
0000
0
000

G3MO1501

4)
Connect
test
mode
connector
at
the
lower
portion
of

instrument
panel
(onthe
driver's
side),
to
the
side
of
the

center
console
box
.

Test
mode
connector

B2M0432B
I

\
Subaru
select
monitor

1

o
cocoaoaooo
cocoaoooou

a---
7

82M0829A

5)
Connect
Subaru
select
monitor
to
data
link
connector
.

*
Using
data
link
connector
for
Subaru
select
monitor

only
:

Connect
Subaru
select
monitor
to
its
data
link
connector

located
in
the
lower
portion
of
the
instrument
panel
(on
the
driver's
side),
to
the
side
of
thecenter
console
box
.

38

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

I
ST
I

1-1
ooaao0000000000oaooo

OBD0669A
I

ST2

00000
I
0
0
(03C03
0

~
00000
;
i~~
C01-

ST1

OBDD057A

9
Using
data
link
connector
for
Subaru
select
monitor

and
OBD-II
general
scan
tool
:

(1)
Connect
ST
to
Subaru
select
monitorcable
.

ST
498357200
ADAPTER
CABLE

(2)
Open
the
cover
and
connect
Subaru
select
moni-

torto
data
link
connector
located
in
thelower
portion

of
the
instrument
panel(on
the
driver'sside),to
the

lower
cover
.

CAUTION
:

Do
not
connect
scan
tools
except
for
Subaru
select
mon-

itor
and
OBD-II
general
scan
tool
.

6)
Turn
ignition
switch
to
ON
(engine
OFF)
and
Subaru

select
monitor
switch
to
ON
.

7)
Start
the
engine
.

NOTE
:

Ensure
the
selector
lever
is
placed
in
the
"P"
position

before
starting
.

8)
Using
the
selector
lever
or
shift
lever,
turn
the
"P"
posi-

tion
switch
and
the
"N"
position
switch
to
ON
.

9)
Depress
the
brake
pedal
to
turn
the
brake
switch
ON
.

10)
Keep
engine
speed
in
the
2,500-3,000
rpm
range
for

40
seconds
.

NOTE
:

On
models
without
tachometer,
usethe
Subaru
select

monitor
or
tachometer
(Secondary
pickup
type)
.

11)
Place
the
selector
lever
or
shift
lever
in
the
"D"
posi-

tion
and
drive
the
vehicle
at
5
to
10
km/h
(3to
6
MPH)
.

NOTE
:

On
AWD
vehicles,
release
the
parking
brake
.

F
:
COMPULSORY
VALVE
OPERATION
CHECK

MODE

1
.
SUBARU
SELECT
MONITOR

1)
Prepare
Subaru
select
monitor
and
cartridge
.

ST1
498307500
SELECT
MONITOR
KIT

ST2
498345700
CARTRIDGE

39

2-7
[73F1]
ON-BOARD
DIAGNOSTICS
11
SYSTEM
3
.
Diagnosis
System

2)
Turn
ignition
switch
and
Subaru
select
monitor
switch

to
OFF
.

3)Insert
cartridge
into
Subaru
select
monitor
.

0000
0000

F1

ooao
E10000
0000

G3M0150I

4)
Connect
test
mode
connector
at
the
lower
portion
of

instrument
panel(on
the
driver's
side),
to
the
sideof
the
center
console
box
.

Test
mode
connector

B2M0432B

\
Subaru
select
monitor

1

e~sa

00000
nooooDODO"ooooa

7

B2M0829A

5)
Connect
Subaru
select
monitor
to
data
link
connector
.

9
Using
data
link
connector
for
Subaru
select
monitor

only
:

Connect
Subaru
select
monitor
to
its
data
link
connector

located
in
the
lower
portion
of
the
instrument
panel(on

the
driver's
side),
to
the
side
of
thecenter
console
box
.

e
Using
data
fink
connector
for
Subaru
select
monitor

and
OBD-II
general
scan
tool
:

(1)
Connect
ST
to
Subaru
select
monitor
cable
.

ST1
498357200
ADAPTER
CABLE

40

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T3F1]
2-7

3
.
Diagnosis
System

SELECT
SYSTEM

EGi
Y
:O,N
:/

~
101

H2M
1149
I

0000
~o

a~a~o
e
sA
e1

n
F03
1-01
Fol
0
4567
/

Fol
FE-11
0
F-01
no
0
23
ENT

F

F

0100on
10-1

SuBARU
G3MO152]

EGR
SOL
(
FD
05
)

O
:Y
1
:N

82M0650

(2)
Open
the
cover
and
connect
Subaru
select
moni-

tor
to
data
link
connector
located
in
the
lower
portion

of
the
instrument
panel(on
the
driver's
side),
to
the

lower
cover
.

CAUTION
:

Do
not
connect
scan
tools
except
for
Subaru
select
mon-

itor
and
OBD-II
general
scan
tool
.

6)
Turn
ignition
switch
to
ON
(engine
OFF)
and
Subaru

select
monitor
switch
to
ON
.

7)
Select
engine
mode
using
function
key
.

Press
thefunction
key
[0]
.

8)
Designate
mode
using
function
key
.

Refer
to
"6
.
READDATA
FUNCTIONKEY
LIST
FOR

ENGINE"
2-7
[T3C6]*4
.

(Example
:
Press
[F]
[D]
[0][5]
[ENT]
in
that
order
.)

9)
Ensure
displayed
message
.

41

OBD0006C
B: OBD-II GENERAL SCAN TOOL
1. HOW TO USE OBD-II GENERAL SCAN TOOL
1) Prepare a general scan tool (OBD-II general scan tool)
required by SAE J1978.
2) Open the cover and connect the OBD-II general scan
tool to the data link connector located in the lower portion
of the instrument panel (on the driver’s side), to the lower
cover.
3) Using the OBD-II general scan tool, call up diagnostic
trouble code(s) and freeze frame data.
OBD-II general scan tool functions consist of:
(1) MODE $01: Current powertrain diagnostic data
(2) MODE $02: Powertrain freeze frame data
(3) MODE $03: Emission-related powertrain diagnostic
trouble codes
(4) MODE $04: Clear/Reset emission-related diagnos-
tic information
(5) MODE $05: Oxygen sensor monitoring test results
Read out data according to repair procedures.
(For detailed operation procedures, refer to the OBD-II
General Scan Tool Operation Manual.)
NOTE:
For details concerning diagnostic trouble codes, refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST, 2-7
[T10A0].
H2M1280
2. DATA LINK CONNECTOR (FOR OBD-II GENERAL
SCAN TOOL AND SUBARU SELECT MONITOR)
1) This connector is used both for OBD-II general scan
tools and the Subaru Select Monitor.
2) Terminal No. 4 to No. 6 of the data link connector is
used for the Subaru Select Monitor signal.
CAUTION:
Do not connect any scan tools other than the OBD-II
general scan tools and the Subaru Select Monitor,
because the circuit for the Subaru Select Monitor may
be damaged.
Terminal No. Contents Terminal No. Contents
1 Power supply 9 Blank
2 Blank 10 K line of ISO 9141 CARB
3 Blank 11 Blank
4Subaru Select Monitor signal (ECM to Subaru
Select Monitor)*12 Ground
5Subaru Select Monitor signal (Subaru Select
Monitor to ECM)*13 Ground
6 Subaru Select Monitor clock* 14 Blank
7 Blank 15 Blank
8 Blank 16 Blank
*: Circuit only for Subaru Select Monitor
29
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

3. CURRENT POWERTRAIN DIAGNOSTIC DATA
(MODE $01)
Refers to data denoting the current operating condition of
analog input/output, digital input/output and/or the power-
train system.
A list of the support data and PID (Parameter Identification)
codes are shown in the following table.
PID DataUnit of measure
01 Number of emission-related powertrain trouble codes and MIL status ON/OFF
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term fuel trim%
0B Intake manifold absolute pressurekPa
0C Engine revolutionrpm
0D Vehicle speedkm/h
0E Ignition timing advance°
10 Air flow rate from mass air flow sensor g/sec
11 Throttle valve opening angle%
13 Check whether oxygen sensor is installed.—
14 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 1 V and %
15 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 2 V and %
1C On-board diagnosis system—
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access generic OBD-II PIDs (MODE $01).
4. POWERTRAIN FREEZE FRAME DATA (MODE $02)
Refers to data denoting the operating condition when
trouble is sensed by the on-board diagnosis system.
A list of the support data and PID (Parameter Identification)
codes are shown in the following table.
PID DataUnit of measure
02 Trouble code that caused CARB required freeze frame data storage—
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term fuel trim%
0B Intake manifold absolute pressurekPa
0C Engine revolutionrpm
0D Vehicle speedkm/h
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access freeze frame data (MODE $02).
30
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

5. EMISSION-RELATED POWERTRAIN DIAGNOSTIC
TROUBLE CODE (MODE $03)
Refers to data denoting emission-related powertrain diag-
nostic trouble codes.
For details concerning diagnostic trouble codes, refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST, 2-7
[T10A0].
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access emission-related powertrain diag-
nostic trouble codes (MODE $03).
6. CLEAR/RESET EMISSION-RELATED DIAGNOSTIC
INFORMATION (MODE $04)
Refers to the mode used to clear or reset emission-related
diagnostic information (OBD-II trouble diagnostic informa-
tion).
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to clear or reset emission-related diagnostic
information (MODE $04).
7. OXYGEN SENSOR MONITORING TEST RESULTS
(MODE $05)
Refers to the mode using oxygen sensor output data while
the on-board diagnosis system is performing diagnosis on
the oxygen sensor.
A list of the support oxygen sensor output data and test ID
(identification) are shown in the following table.
Test ID DataUnit of measure
01 Rich to lean sensor threshold voltage (constant) V
02 Lean to rich sensor threshold voltage (constant) V
03 Low sensor voltage for switch time calculation (constant) V
04 High sensor voltage for switch time calculation (constant) V
05 Rich to lean sensor switch time (calculated) sec.
06 Lean to rich sensor switch time (calculated) sec.
07 Minimum sensor voltage for test cycle (calculated) V
08 Maximum sensor voltage for test cycle (calculated) V
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access oxygen sensor monitoring test
results (MODE $05).
31
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

OBD0057A
C: SUBARU SELECT MONITOR
1. HOW TO USE SUBARU SELECT MONITOR
1) Prepare Subaru select monitor and cartridge.
ST1 498307500 SELECT MONITOR KIT
ST2 498345700 CARTRIDGE
G3M0150
2) Turn ignition switch and Subaru select monitor switch to
OFF.
3) Insert cartridge into Subaru select monitor.
OBD0059A
4) Connect Subaru select monitor to data link connector.

Using data link connector for Subaru select monitor
only, connect Subaru select monitor to its data link con-
nector located in the lower portion of the instrument
panel (on the driver’s side), to the side of the center
console box.
OBD0669A

Using data link connector for Subaru select monitor
and OBD-II general scan tool;
(1) Connect ST to Subaru select monitor cable.
ST 498357200 ADAPTER CABLE
OBD0006C
(2) Open the cover and connect Subaru select monitor
to data link connector located in the lower portion of the
instrument panel (on the driver’s side), to the lower
cover.
CAUTION:
Do not connect scan tools except for Subaru select
monitor and OBD-II general scan tool.
32
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

G3M0150
3) Insert cartridge into Subaru select monitor.
OBD0005B
4) Connect test mode connector at the lower portion of
instrument panel (on the driver’s side), to the side of the
center console box.
OBD0059A
5) Connect Subaru select monitor to data link connector.

Using data link connector for Subaru select monitor only:
Connect Subaru select monitor to its data link connector
located in the lower portion of the instrument panel (on the
driver’s side), to the side of the center console box.
OBD0669A

Using data link connector for Subaru select monitor and
OBD-II general scan tool:
(1) Connect ST to Subaru select monitor cable.
ST 498357200 ADAPTER CABLE
OBD0006C
(2) Open the cover and connect Subaru select monitor
to data link connector located in the lower portion of the
instrument panel (on the driver’s side), to the lower
cover.
CAUTION:
Do not connect scan tools except for Subaru select
monitor and OBD-II general scan tool.
60
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System