Subaru Legacy IV (2008 year). Manual - part 302

EN(H4DOTC)(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 con-
sist 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 procedures.
(For detailed operation procedure, refer to the gen-
eral scan tool operation manual.)

NOTE:
For details concerning DTC, refer to “List of Diag-
nostic Trouble Code (DTC)”. <Ref. to
EN(H4DOTC)(diag)-81, List of Diagnostic Trouble
Code (DTC).>

EN-02533

EN(H4DOTC)(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 diag-
nosis 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

%

$12

Secondary air control status

 — 

$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

 — 

$1F

Elapsed time after starting the engine

sec

$21

Running distance after MIL turns on

miles

$24

A/F value and A/F sensor output voltage

– and V

$2E

Evaporative purge

%

$2F

Fuel level

%

$30

Number of warm ups after DTC clear

 — 

$31

Travel distance after DTC clear

miles

$32

Tank pressure

Pa

$33

Atmospheric pressure

kPa

$34

A/F sensor 

O value, current

– and mA

$3C

Catalyzer temperature

°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 operation time during MIL on

min

$4E

Elapsed time after DTC clear

min

$51

Fuel used

 — 

$5A

Relative accelerator opening angle

%

EN(H4DOTC)(diag)-31

General Scan Tool

ENGINE (DIAGNOSTICS)

3. MODE $02 (POWERTRAIN FREEZE FRAME DATA)

Refer 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.

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

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

Refer to “List of Diagnostic Trouble Code (DTC)” for information about data denoting emission-related pow-
ertrain DTC. <Ref. to EN(H4DOTC)(diag)-81, 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 (OBD-II trouble diagnostic
information).

NOTE:
Refer to general scan tool manufacturer’s instruction manual to clear the emission-related diagnostic infor-
mation (MODE $04).

PID

Data

Unit of measure

$02

DTC that caused the freeze frame data storage required by CARB

 — 

$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

gm/s

$11

Throttle valve absolute opening angle

%

$12

Secondary air control status

 — 

$13

Air fuel ratio sensor

 — 

$15

Rear oxygen sensor voltage, compensation value

V and %

$1C

Supporting OBD system

 — 

$1F

Elapsed time after starting the engine

sec

$2E

Evaporative purge

%

$2F

Fuel level

%

$32

Tank pressure

Pa

$33

Atmospheric pressure

kPa

$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

%

EN(H4DOTC)(diag)-32

General Scan Tool

ENGINE (DIAGNOSTICS)

6. MODE $06

Refer to test value of troubleshooting and data of test limit indicated on the support data bit sequence table.
A list of the support data is shown in the following table.

OBDMID

TID

SID

Diagnostic item

$01

$81

$0A

A/F sensor conduction abnormal (Bank 1 Sensor 1)

$82

$8D

$83

$14

$84

$1E

A/F sensor range failure (Bank 1 Sensor 1)

$85

$1E

$86

$20

A/F sensor response failure (Bank 1 Sensor 1)

$02

$87

$0B

Oxygen sensor circuit abnormal (Bank 1 Sensor 2)

$88

$0B

$07

$0B

Oxygen sensor drop failure (Bank 1 Sensor 2)

$08

$0B

$A5

$0B

$05

$10

Oxygen sensor response failure (Bank 1 Sensor 2)

$06

$10

$21

$89

$20

Catalyst degradation diagnosis (B1)

$39

$93

$FE

Evaporative emission control system leak detected (Fuel filler cap off)

$3B

$94

$FE

Evaporative emission control system (0.04 inch leak)

$95

$FE

$3C

$96

$FE

Evaporative emission control system (0.02 inch leak)

$97

$FE

$3D

$98

$FE

Evaporative emission control system (purge flow)

$41

$99

$24

A/F sensor heater failure (Bank 1 Sensor 1)

$9A

$24

$9B

$14

A/F sensor heater characteristics failure (Bank 1 Sensor 1)

$42

$9C

$24

Oxygen sensor heater abnormal (Bank 1 Sensor 2)

$9D

$24

$71

$9E

$17

Secondary air system (whole system)

$9F

$0B

$A0

$0B

$B0

$17

Secondary air system (relay 2 — combination valve 2)

$B1

$0B

$B1

$17

$B2

$0B

$B2

$17

$B3

$0B

$B4

$0B

$B5

$0B

$B6

$31

$B7

$31

$A1

$0B

$24

Misfire monitoring (All cylinders)

$0C

$24

$A2

$0B

$24

Misfire monitoring (#1 cylinder)

$0C

$24

$A3

$0B

$24

Misfire monitoring (#2 cylinder)

$0C

$24

$A4

$0B

$24

Misfire monitoring (#3 cylinder)

$0C

$24

$A5

$0B

$24

Misfire monitoring (#4 cylinder)

$0C

$24

$E1

$A6

$FE

Purge control solenoid valve 2 close seized