Subaru Legacy (2005 year). Service manual - part 184

EN(H4SO 2.5)(diag)-21

ENGINE (DIAGNOSTICS)

Engine Condition Data

6. Engine Condition Data

A: ELECTRICAL SPECIFICATION

Measuring condition:
• After engine is warmed-up.
• Gear position is in “N” or “P” range.
• Turn the A/C to OFF.
• Turn all the accessory switches to OFF.

Remarks

Specifications

Engine load

1.6 — 2.9 (%): Idling

6.4 — 12.8 (%): 2,500 rpm racing

EN(H4SO 2.5)(diag)-22

ENGINE (DIAGNOSTICS)

Data Link Connector

7. Data Link Connector

A: NOTE

This connector is used for connecting the Subaru Select Monitor.

CAUTION:
Do not connect any scan tools except Subaru Select Monitor or general scan tool because the circuit 
for Subaru Select Monitor may be damaged.

EN-00037

1

2

3

4

5

7

6

8

9 10 11 12 13

15

14

16

Terminal No.

Remarks

Terminal No.

Remarks

1

Power supply

9

Empty

2

Empty

10

Subaru Select Monitor signal

3

Empty

11

Empty

4

Empty

12

Ground

5

Empty

13

Ground

6

Empty

14

Empty

7

Empty

15

Empty

8

Empty

16

Empty

EN(H4SO 2.5)(diag)-23

ENGINE (DIAGNOSTICS)

General Scan Tool

8. General Scan Tool

A: OPERATION

1. HOW TO USE GENERAL SCAN TOOL

1) Prepare a general scan tool (general scan tool)
required by SAE J1978.
2) Connect the general scan tool to data link con-
nector located in the lower portion of the instrument
panel (on the driver’s side).

3) Using the general scan tool, call up DTC and
freeze frame data.
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
DTC
(4) MODE $04: Clear/Reset emission-related
diagnostic information

Read out the data according to repair procedures.
(For detailed operation procedure, refer to the gen-
eral scan tool operation manual.)

NOTE:
For details concerning DTCs, refer to the List of Di-
agnostic Trouble Code (DTC). <Ref. to EN(H4SO
2.5)(diag)-69, List of Diagnostic Trouble Code
(DTC).>

2. MODE $01 (CURRENT POWERTRAIN DIAGNOSTIC DATA)

Refer to data denoting the current operating condition of analog input/output, digital input/output or the pow-
ertrain system.
A list of the support data and PID (Parameter Identification) codes are shown in the following table.

NOTE:
Refer to general scan tool manufacturer’s operation manual to access current powertrain diagnostic data
(MODE $01).

EN-02533

PID

Data

Unit of measure

01

Number of emission-related powertrain DTC and malfunction indicator light status and diag-
nosis support information

—

03

Fuel system control status

—

04

Calculated engine load value

%

05

Engine coolant temperature

°C or °F

06

Short term fuel trim

%

07

Long term fuel trim

%

0B

Intake manifold absolute pressure

mmHg, kPa, inHg or 

psig

0C

Engine revolution

rpm

0D

Vehicle speed

km/h or MPH

0E

Ignition timing advance

°

0F

Intake air temperature

°C or °F

10

Air flow rate from mass air flow sensor

g/s or lb/m

11

Throttle valve absolute opening angle

%

13

Check whether oxygen sensor is installed

—

15

Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor

V and %

1C

Supporting OBD system

—

21

Driving distance after MIL illuminates

km or miles

24

A/F value and A/F sensor output voltage

— and V

34

A/F sensor lambda valve and current

— and mA

EN(H4SO 2.5)(diag)-24

ENGINE (DIAGNOSTICS)

General Scan Tool

3. MODE $02 (POWERTRAIN FREEZE FRAME DATA)

Refer to data denoting the operating condition when trouble is detected by on-board diagnosis system.
A list of the support data and PID (Parameter Identification) codes are shown in the following table.

NOTE:
Refer to general scan tool manufacturer’s operation manual to access freeze frame data (MODE $02).

4. MODE $03 (EMISSION-RELATED POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC))

Refer to “Read Diagnostic Trouble Code (DTC)” for information about data denoting emission-related pow-
ertrain DTC. <Ref. to EN(H4SO 2.5)(diag)-69, List of Diagnostic Trouble Code (DTC).>

5. MODE $04 (CLEAR/RESET EMISSION-RELATED DIAGNOSTIC INFORMATION)

Refer to the mode used to clear or reset emission-related diagnostic information.

NOTE:
Refer to general scan tool manufacturer’s operation manual to clear or reset emission-related diagnostic in-
formation (MODE $04).

PID

Data

Unit of measure

02

DTC for freeze frame data

—

03

Fuel system control status

—

04

Calculated engine load value

%

05

Engine coolant temperature

°C or °F

06

Short term fuel trim

%

07

Long term fuel trim

%

0B

Intake manifold absolute pressure

mmHg, kPa, inHg or 

psig

0C

Engine speed

rpm

0D

Vehicle speed

km/h or MPH

0E

Ignition timing advance

°

0F

Intake air temperature

°C or °F

10

Air flow rate from mass air flow sensor

g/s or lb/m

11

Throttle valve absolute opening angle

%