Subaru Legacy IV (2008 year). Service manual - part 106

EN(H4SO)(diag)-27

Engine Condition Data

ENGINE (DIAGNOSTICS)

6. Engine Condition Data

A: ELECTRICAL SPECIFICATION

Measuring condition:
• After engine is warmed up.
• Set the select lever in “P” range or “N” range, or the shift lever in neutral.
• Turn the A/C off.
• Turn all the accessory switches to OFF.

Contents

Specification

Engine Load

17.6 — 40.5 (%): Idling

14.7 — 29.8 (%): 2,500 rpm racing

EN(H4SO)(diag)-28

Data Link Connector

ENGINE (DIAGNOSTICS)

7. Data Link Connector

A: NOTE

This connector is used for 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.

1

2

3

4

5

7

6

8

9 10 11 12 13

15

14

16

EN-04893

Terminal No.

Contents

Terminal No.

Contents

1

Blank

9

Blank

2

Blank

10

Blank

3

Blank

11

Blank

4

Ground

12

Blank

5

Ground

13

Blank

6

CAN (+)

14

CAN (–)

7

Subaru Select Monitor signal

15

Blank

8

Blank

16

Power supply

EN(H4SO)(diag)-29

General Scan Tool

ENGINE (DIAGNOSTICS)

8. General Scan Tool

A: OPERATION

1. HOW TO USE GENERAL SCAN TOOL

1) Prepare a scan tool (general scan tool) required
by SAE J1978.
2) Open the cover and connect the general scan
tool to the data link connector located in the lower
area of 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
(5) MODE $06: Request on-board monitoring
test results for intermittently monitored systems
(6) MODE $07: Request on-board monitoring
test results for continuously monitored systems
(7) MODE $09: Request vehicle information
Read out the data according to repair proce-
dures. (For detailed operation procedure, refer
to the general scan tool operation manual.)

NOTE:
For details concerning DTC, refer to “List of Diag-
nostic Trouble Code (DTC)”. <Ref. to
EN(H4SO)(diag)-80, List of Diagnostic Trouble
Code (DTC).>

EN-02533

EN(H4SO)(diag)-30

General Scan Tool

ENGINE (DIAGNOSTICS)

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 instruction manual to access generic OBD-II PIDs (MODE $01).

PID

Data

Unit of measure

$01

Number of emission-related powertrain DTC, and malfunction indicator light status and diagnosis 
support information

 — 

$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 pressure

kPa

$0C

Engine speed

rpm

$0D

Vehicle speed

MPH

$0E

Ignition timing advance

°

$0F

Intake air temperature

°C

$10

Air flow rate from the mass air flow sensor

g/s

$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 (Bank 1 Sensor 2)

V and %

$1C

Supporting OBD system

 — 

$1F

Elapsed time after starting the engine

sec

$21

Travel distance after the malfunction indicator light illuminates

miles

$24

A/F value and A/F sensor output voltage (Bank 1 Sensor 1)

– and V

$2C

Target EGR

%

$2D

EGR deviation

%

$2E

Evaporative purge

%

$2F

Fuel level

%

$30

Number of warm ups after DTC clear

 — 

$31

Travel distance after DTC clear

miles

$32

Fuel tank pressure

Pa

$33

Atmospheric pressure

kPa

$34

A/F value and A/F sensor current (Bank 1 Sensor 1)

– and mA

$3C

Catalyst temperature #1

°C

$41

Diagnosis monitoring per drive cycle

 — 

$42

ECM power supply voltage

V

$43

Absolute load

%

$44

A/F target lambda

 — 

$45

Relative throttle opening angle

%

$46

Ambient temperature

°C

$47

Absolute throttle opening angle 2

%

$49

Absolute accelerator opening angle 1

%

$4A

Absolute accelerator opening angle 2

%

$4C

Target throttle opening angle

%

$4D

Engine operating time while malfunction indicator lit

min

$4E

Elapsed time after DTC clear

min

$51

Fuel used

 — 

$5A

Relative acceleration opening angle

%