1997 SUBARU LEGACY ignition

G3M0151
6) After the display is gone, turn Subaru select monitor
switch and ignition switch to OFF.
NOTE:
When the ECM, battery terminals, etc. are disconnected
after memory is cleared, idling speed may increase. This is
not considered a problem because the ISC valve duty con-
trolled learning value has been cleared. To return the
engine to idling speed, idle for approximately 2 minutes
with air conditioner off.
2. OBD-II GENERAL SCAN TOOL
For clear memory procedures using the OBD-II general
scan tool, refer to the OBD-II General Scan Tool Instruction
Manual.
OBD0072A
E: INSPECTION MODE
1. PREPARATIONS FOR THE INSPECTION MODE
Raise the vehicle using a garage jack and place on safety
stands or drive the vehicle onto free rollers.

FULL-TIME AWD MODELS
WARNING:

Before raising the vehicle, ensure parking brakes
are applied.

Do not use a pantograph jack in place of a safety
stand.

Secure a rope or wire to the front and rear towing or
tie-down hooks to prevent the lateral runout of front
wheels.

Do not abruptly depress/release clutch pedal or
accelerator pedal during works even when engine is
operating at low speeds since this may cause vehicle
to jump off free rollers.

In order to prevent the vehicle from slipping due to
vibration, do not place any wooden blocks or similar
items between the safety stands and the vehicle.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

Since the rear wheels will also rotate, do not place
anything near them. Also, make sure that nobody goes
in front of the vehicle.
OBD0073A

FWD MODELS
WARNING:

Before raising the vehicle, ensure parking brakes
are applied.

Do not use a pantograph jack in place of a safety
stand.

If only the front wheels are raised or placed on a free
roller, apply parking brakes and lock the rear wheels.

Secure a rope or wire to the front and rear towing or
tie-down hooks to prevent the lateral runout of front
wheels.

Do not abruptly depress/release clutch pedal or
accelerator pedal during works even when engine is
operating at low speeds since this may cause vehicle
to jump off free rollers.

In order to prevent the vehicle from slipping due to
vibration, do not place any wooden blocks or similar
items between the safety stands and the vehicle.

Since the rear wheels will also rotate, do not place
anything near them. Also, make sure that nobody goes
in front of the vehicle.
OBD0057A
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 498346300 CARTRIDGE
G3M0151
2) Turn ignition switch and Subaru select monitor switch to
OFF.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

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
OBD0006F
B2M0433D
(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.
OBD0060
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. (AT vehicles)

Depress clutch pedal when starting the engine. (MT
vehicles)
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.
(AT vehicles)
10) Keep engine speed in the 2,500—3,000 rpm range
for 40 seconds.
NOTE:
On models without tachometer, use the Subaru select
monitor or tachometer (Secondary pickup type).
11) Place the selector lever or shift lever in the“D”posi-
tion (AT vehicles) or“1st”gear (MT vehicles) and drive the
vehicle at 5 to 10 km/h (3 to 6 MPH).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

G3M0152
2) Designate mode using function key.
Press [F] [B] [0] [ENT] in that order.
OBD0086
3) Ensure diagnostic trouble code(s) is shown.
(1) When there is only one diagnostic trouble code.
OBD0087
(2) When there are multiple diagnostic trouble codes.
NOTE:
For details concerning diagnostic trouble code(s), refer to
the DIAGNOSTIC TROUBLE CODE (DTC) LIST. 2-7 [T10A0], [T11A0].>
OBD0057A
F: COMPULSORY VALVE OPERATION
CHECK MODE
1. SUBARU SELECT MONITOR
1) Prepare Subaru select monitor and cartridge.
ST1 498307500 SELECT MONITOR KIT
ST2 498346300 CARTRIDGE
G3M0151
2) Turn ignition switch and Subaru select monitor switch to
OFF.
71
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

OBD0669A

Using data link connector for Subaru select monitor and
OBD-II general scan tool:
(1) Connect ST to Subaru select monitor cable.
ST1 498357200 ADAPTER CABLE
OBD0006F
B2M0433D
(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.
OBD0060
6) Turn ignition switch to ON (engine OFF) and Subaru
select monitor switch to ON.
H2M1149
7) Select engine mode using function key.
Press the function key [0].
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

B2M0643
11) When compulsory valve operation check mode is
exited or check completed, the monitor indicates the
completion of compulsory valve operation check on the
display, and automatically returns to the initial mode
(FUNCTION MODE: F00).
G3M0151
G: FINISHING DIAGNOSIS OPERATION
1. SUBARU SELECT MONITOR
1) Turn Subaru select monitor switch and ignition switch to
OFF.
2) Disconnect Subaru select monitor from its data link con-
nector.
3) Disconnect test mode connector at the lower portion of
instrument panel (on the driver’s side), to the side of the
center console box.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

4. Cautions
A: SUPPLEMENTAL RESTRAINT SYSTEM
“AIRBAG”
Airbag system wiring harness is routed near the engine
control module (ECM), main relay and fuel pump relay.
CAUTION:

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.

Be careful not to damage Airbag system wiring har-
ness when servicing the engine control module (ECM),
transmission control module (TCM), main relay and
fuel pump relay.
B: PRECAUTIONS
1) Never connect the battery in reverse polarity.

The ECM will be destroyed instantly.

The fuel injector and other part will be damaged in just
a few minutes more.
2) Do not disconnect the battery terminals while the
engine is running.

A large counter electromotive force will be generated in
the alternator, and this voltage may damage electronic
parts such as ECM, etc.
3) Before disconnecting the connectors of each sensor
and the ECM, be sure to turn OFF the ignition switch.
4) Before removing ECM from the located position, dis-
connect two cables on battery.

Otherwise, the ECM may be damaged.
5) The connectors to each sensor in the engine compart-
ment and the harness connectors on the engine side and
body side are all designed to be waterproof. However, it is
still necessary to take care not to allow water to get into the
connectors when washing the vehicle, or when servicing
the vehicle on a rainy day.
H2M1154A
6) Use ECM mounting stud bolts at the body head ground-
ing point when measuring voltage and resistance inside the
passenger compartment.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
4. Cautions

5. Specified Data
1. ENGINE CONTROL MODULE (ECM) I/O SIGNAL
OBD0092A
ContentConnector
No.Terminal
No.Signal (V)
Note
Ignition SW ON
(Engine OFF)Engine ON (Idling)
Crankshaft
position
sensorSignal (+) B84 8 07—+7 Sensor output waveform
Signal () B84 29 0 0—
Shield B84 54 0 0—
Camshaft
position
sensorSignal (+) B84 7 07—+7 Sensor output waveform
Signal () B84 28 0 0—
Shield B84 54 0 0—
Mass air
flow sensorSignal B84 5 0—0.3 0.8—1.2—
Shield B84 57 0 0—
GND B84 53 0 0—
Throttle
position
sensorSignal B84 6Fully closed: 0.2—1.0
Fully opened: 4.2—4.7—
Power
supplyB84 21 5 5—
GND B84 20 0 0—
Front
oxygen
sensorSignal B84 23 0 0—0.9—
Shield B84 56 0 0—
Rear
oxygen
sensorSignal B84 24 0 0—0.9—
Shield B84 56 0 0—
Engine coolant
temperature sensorB84 22 1.0—1.4 1.0—1.4 After warm-up
Vehicle speed sensor 2 B84 83 0 or 5 0 or 5“5”and“0”are repeatedly
displayed when vehicle is
driven.
Starter switch B84 86 0 0 Cranking: 8 to 14
A/C switch B84 60ON: 10—13
OFF: 0ON: 13—14
OFF: 0—
Ignition switch B84 85 10—13 13—14—
Neutral position switch
(MT)
B84 82ON: 5.0±0.5
OFF: 0
On MT model; switch is ON
when gear is in neutral position.
Neutral position switch
(AT)ON: 0
OFF: 5.0±0.5
On AT model; switch is ON when
shift is in“N”or“P”position.
Test mode connector B84 84 5 5 When connected: 0
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
5. Specified Data