Subaru Legacy III (2000-2003 year). Manual - part 309

EN(H6DO)-38

ENGINE (DIAGNOSTICS)

SUBARU SELECT MONITOR

ISC Valve Duty Ratio

Display: 0 — 127.5%

The duty value of the idle air control solenoid valve
is displayed. This value is regulated by the ECM.
The displayed value of 0 % indicates that the air by-
pass circuit is closed, and 100 % indicates that it is
fully-open. 

No of EGR Steps

Display: 0 — 255 step

The number of the EGR valve steps is displayed.
The EGR valve is driven by the stepping motor, and
the number of steps is regulated by the ECM. A val-
ue of 0 steps indicates that the EGR ratio is 0 %. 

Rear O2 Heater Voltage

Display: 0 — 5.1 V

The heater voltage value of the rear oxygen sensor
is displayed. The heater current duty-controlled by
driving range regulates heater temperature. 

A/F Heater Current 1, 2

Display: 0 — 25.5 A

The heater voltage value of the front oxygen (A/F)
sensor is displayed. To stabilize the output, the
heater current is regulated to keep heater temper-
ature to the specified value. 

AT Vehicle ID Signal

Display: ON or OFF

AT and MT vehicles are identified. For AT vehicles,
ON is displayed, and for MT ones, OFF is dis-
played. 

Neutral Position Switch

Display: ON or OFF

When the shift lever stays in the neutral position,
ON is displayed. When in other positions, OFF is
displayed. 

Idle Switch Signal

Display: ON or OFF

When the accelerator pedal is released fully, ON is
displayed. When depressed fully, OFF is displayed. 

P/S Switch

Display: ON or OFF

When the steering wheel is turned fully, ON is dis-
played. When returned, OFF is displayed. This sig-
nal is used for idle control or other controls. 

A/C Switch

Display: ON or OFF

When the A/C switch is turned ON, ON is dis-
played. When turned OFF, OFF is displayed. This
signal is used for idle control or other controls. 

Starter Switch

Display: ON or OFF

When the vehicle is cranking, ON is displayed.
When not cranking, OFF is displayed. 

Rear O2 Rich Signal

Display: ON or OFF

When the A/F ratio is rich, ON is displayed. When
lean, OFF is displayed. 

Knocking Signal

Display: ON or OFF

When knocking occurs and the ignition timing is re-
tarded, ON is displayed. At any other time, OFF is
displayed. 

Crankshaft Position Sig.

Display: ON or OFF

When a crankshaft signal exists, ON is displayed.
At any other time (at engine stall), OFF is dis-
played. 

Camshaft Position Sig.

Display: ON or OFF

When a camshaft signal exists, ON is displayed. At
any other time (at engine stall), OFF is displayed. 

Rear Defogger SW

Display: ON or OFF

When the rear defogger switch is turned ON, ON is
displayed. When turned OFF, OFF is displayed.
This signal is used for idle control or other controls. 

Blower Fan SW

Display: ON or OFF

When the blower fan switch is turned ON, ON is
displayed. When turned OFF, OFF is displayed.
This signal is used for idle control or other controls. 

Light Switch

Display: ON or OFF

When the light switch is turned ON, ON is dis-
played. When turned OFF, OFF is displayed. This
signal is used for idle control or other controls. 

A/C Lock Signal

Display: ON or OFF

Whether or not the A/C compressor is active is de-
tected. When it is active, ON is displayed. When in-
active, OFF is displayed. 

A/C Mid Pressure Switch

Display: ON or OFF

The status of the A/C compressor is detected.
When the A/C compressor voltage is high, ON is
displayed. When low, OFF is displayed. 

EN(H6DO)-39

ENGINE (DIAGNOSTICS)

SUBARU SELECT MONITOR

A/C Compressor Signal

Display: ON or OFF

When the A/C clutch is engaged, ON is displayed.
When disengaged, OFF is displayed. 

Radiator Fan Relay #1, #2, #3

Display: ON or OFF

When the radiator fan relay is ON (radiator oper-
ates), ON is displayed. When OFF (radiator stops),
OFF is displayed. 

Fuel Pump Relay

Display: ON or OFF

When the radiator fan relay is ON (fuel pump oper-
ates), ON is displayed. When OFF (fuel pump
stops), OFF is displayed. 

Torque Control Signal #1, #2

Display: ON or OFF

When a torque down signal exists, ON is displayed.
When it doesn't, OFF is displayed. 

Torque Permission Signal

Display: ON or OFF

The signal which notifies whether or not torque
down is possible is displayed. This signal is trans-
mitted from the ECU in response to a torque down
signal from the TCU. When torque down is prohib-
ited, ON is displayed. When permitted, OFF is dis-
played. 

Variable Intake Air Sol.

Display: ON or OFF

The status of the induction control valve is dis-
played. When the valve is closed for the control to
improve low- and mid-speed range, ON is dis-
played. When open, OFF is displayed. 

Alternator output signal

Display: 0% or 100%

Alternator control status is displayed. When in con-
trol 100% is shown. When not in control, 0% is
show.

Fuel pump controller control duty ratio

Display: 33% or 66% or 100%

Duty ratio controlling fuel pump is displayed. This
value is controlled by ECM.

Electric load signal

Display: ON or OFF

When power switch is ON, ON is displayed. When
power switch is OFF, OFF is displayed. This signal
is used for alternator control, etc.

EN(H6DO)-40

ENGINE (DIAGNOSTICS)

SUBARU SELECT MONITOR

5. READ CURRENT DATA FOR ENGINE. (OBD MODE)

1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine Control System} and press the [YES]
key.
3) Press the [YES] key after displayed the information of engine type.
4) On the «Engine Diagnosis» display screen, select the {OBD System} and press the [YES] key.
5) On the «OBD Menu» display screen, select the {Current Data Display & Save} and press the [YES] key.
6) On the «Data Display Menu» display screen, select the {Data Display} and press the [YES] key.
7) Using the scroll key, move the display screen up or down until the desired data is shown.
• A list of the support data is shown in the following table.

NOTE:
For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL.

Contents

Display

Unit of measure

Number of diagnosis code

Number of Diag Code:

—

Malfunction indicator lamp status

MI (MI)

ON or OFF

Monitoring test of misfire

Misfire monitoring

Complete or incomplete

Monitoring test of fuel system

Fuel system monitoring

Complete or incomplete

Monitoring test of comprehensive component

Component monitoring 

Complete or incomplete

Test of catalyst

Catalyst Diagnosis

Complete or incomplete

Test of heated catalyst

Heated catalyst

No support

Test of evaporative emission purge control system

Evaporative purge system

No support

Test of secondary air system

Secondary air system

No support

Test of air conditioning system refrigerant

A/C system refrigerant

No support

Test of oxygen sensor (Bank 1, Bank 2, Rear)

Oxygen sensor

Complete or incomplete

Test of oxygen sensor heater (Bank 1, Bank 2, Rear)

O2 Heater Diagnosis

Complete or incomplete

Test of EGR system

EGR Diagnosis

Complete or incomplete

Air fuel ratio control system for bank 1

Fuel System for Bank 1

C1 normal

Air fuel ratio control system for bank 2

Fuel System for Bank 2

C1 normal

Engine load data

Calculated load valve

%

Engine coolant temperature signal

Coolant Temp.

°

C or  

°

F

Short term fuel trim by front oxygen (A/F) sensor bank 1

Short term fuel trim B1

%

Long term fuel trim by front oxygen (A/F) sensor bank 1

Long term fuel trim B1

%

Short term fuel trim by front oxygen (A/F) sensor bank 2

Short term fuel trim B2

%

Long term fuel trim by front oxygen (A/F) sensor bank 2

Long term fuel trim B2

%

Intake manifold absolute pressure signal

Mani. Absolute Pressure

mmHg or kPa or inHg or 

psig

Engine speed signal

Engine Speed

rpm

Vehicle speed signal

Vehicle Speed

km/h or MPH

Ignition timing for #1 cylinder

Ignition timing #1

°

Intake air temperature signal

Intake Air Temp.

°

C or  

°

F

Throttle position signal

Throttle Opening Angle

%

Oxygen sensor output signal

Oxygen Sensor #12

V

Air fuel ratio correction by rear oxygen sensor

Short term fuel trim #12

%

On-board diagnostic system

OBD System

—

Oxygen sensor equipment

Oxygen Sensor #11

Supported

Oxygen sensor equipment

Oxygen Sensor #12

Supported

Oxygen sensor equipment

Oxygen Sensor #21

Supported

A/F sensor equipment

A/F Sensor #11

—

A/F sensor output signal

A/F Sensor #11

V

A/F sensor equipment

A/F Sensor #21

—

A/F sensor output signal

A/F Sensor #21

V

EN(H6DO)-41

ENGINE (DIAGNOSTICS)

SUBARU SELECT MONITOR

6. READ FREEZE FRAME DATA FOR ENGINE. (OBD MODE)

1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine Control System} and press the [YES]
key.
3) Press the [YES] key after displayed the information of engine type.
4) On the «Engine Diagnosis» display screen, select the {OBD System} and press the [YES] key.
5) On the «OBD Menu» display screen, select the {Freeze Frame Data} and press the [YES] key.
• A list of the support data is shown in the following table.

NOTE:
For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL.

Contents

Display

Unit of measure

Diagnostic trouble code (DTC) for freeze frame data

Freeze frame data

DTC

Air fuel ratio control system for bank 1

Fuel system for Bank1

ON or OFF

Air fuel ratio control system for bank 2

Fuel System for Bank 2

ON or OFF

Engine load data

Engine Load

%

Engine coolant temperature signal

Coolant Temp.

°

C or  

°

F

Short term fuel trim by front oxygen (A/F) sensor bank 1

Short term fuel trim B1

%

Long term fuel trim by front oxygen (A/F) sensor bank 1

Long term fuel trim B1

%

Short term fuel trim by front oxygen (A/F) sensor bank 2

Short term fuel trim B2

%

Long term fuel trim by front oxygen (A/F) sensor bank 2

Long term fuel trim B2

%

Intake manifold absolute pressure signal

Mani. Absolute Pressure

mmHg or kPa or inHg or 

psi

Engine speed signal

Engine Speed

rpm

Vehicle speed signal

Vehicle Speed

km/h or MPH