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Subaru Legacy Service Manual: General scan tool operation

1. HOW TO USE GENERAL SCAN TOOL

1. Prepare a scan tool (general scan tool) required by SAE J1978.

2. Connect the general scan tool to data link connector located in the lower portion of the instrument panel (on the driver’s side).

3. Using the general scan tool, call up each 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: Initial emission-related powertrain DTC

(7) MODE $08: Request control for on-board system, test, and component

(8) MODE $09: Request vehicle information

4. Read out the data according to repair procedures. (For detailed operation procedures, refer to the general scan tool operation manual.)

NOTE:

For details concerning DTC, refer to “List of Diagnostic Trouble Code (DTC)”. 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 powertrain system.

A list of the support data and PID (Parameter Identification) codes are shown in the following table.

PID

Data

Unit of measure

$01

Number of emission-related powertrain DTC and malfunction indicator light status

$03

Fuel system control status

$04

Calculated engine load value

%

$05

Engine coolant temperature

°C

$06

Short term fuel trim (Bank 1)

%

$07

Long term fuel trim (Bank 1)

%

$08

Short term fuel trim (Bank 2)

%

$09

Long term fuel trim (Bank 2)

%

$0B

Intake manifold absolute pressure

kPa

$0C

Engine speed

rpm

$0D

Vehicle speed

MPH

$0E

Ignition timing advance

°

$0F

Intake air temperature

°C

$10

Intake air amount

g/s

$11

Throttle valve opening angle

%

$13

Air fuel ratio sensor

$15

Oxygen sensor output voltage (Bank 1 Sensor 2)

V

$15

Oxygen sensor correction (Bank 1 Sensor 2)

%

$19

Oxygen sensor output voltage (Bank 2 Sensor 2)

V

$19

Oxygen sensor correction (Bank 2 Sensor 2)

%

$1C

On-board diagnostic system

$1F

Elapsed time after starting the engine

sec

$21

Travel distance after the malfunction indicator light illuminates

miles

$24

Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor (Bank 1)

− and V

$28

Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor (Bank 2)

− 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

$33

Barometric pressure

kPa

$34

A/F sensor lambda value (Bank 1 Sensor 1)

$34

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

mA

$38

A/F sensor lambda value (Bank 2 Sensor 1)

$38

A/F sensor current value (Bank 2 Sensor 1)

mA

$3C

Catalyst temperature #1

°C

$3D

Catalyst temperature #2

°C

$41

Diagnostic monitor of each drive cycle

$42

ECM power 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 light lit

min

$4E

Elapsed time after DTC clear

min

$51

Fuel used

$53

ELCM pressure

kPa

$5A

Relative accelerator opening angle

%

$5C

Engine oil temperature

°C

$56

Learning value of sub feedback compensation level

$65

Neutral status

NOTE:

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

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.

PID

Data

Unit of measure

$02

DTC that caused freeze frame data to be stored

$03

Fuel system control status

$04

Calculated engine load value

%

$05

Engine coolant temperature

°C

$06

Short term fuel trim (Bank 1)

%

$07

Long term fuel trim (Bank 1)

%

$08

Short term fuel trim (Bank 2)

%

$09

Long term fuel trim (Bank 2)

%

$0B

Intake manifold absolute pressure

kPa

$0C

Engine speed

rpm

$0D

Vehicle speed

MPH

$0E

Ignition timing advance

°

$0F

Intake air temperature

°C

$10

Intake air amount

g/s

$11

Throttle valve opening angle

%

$13

Air fuel ratio sensor

$15

Oxygen sensor output voltage (Bank 1 Sensor 2)

V

$15

Oxygen sensor correction (Bank 1 Sensor 2)

%

$19

Oxygen sensor output voltage (Bank 2 Sensor 2)

V

$19

Oxygen sensor correction (Bank 2 Sensor 2)

%

$1C

On-board diagnostic system

$1F

Elapsed time after starting the engine

sec

$2C

Target EGR

%

$2D

EGR deviation

%

$2E

Evaporative purge

%

$2F

Fuel level

%

$33

Barometric pressure

kPa

$42

ECM power 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

%

$51

Applicable fuel

$65

Neutral status

NOTE:

Refer to general scan tool manufacturer’s instruction 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 powertrain DTC. 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 emission-related diagnostic information (MODE $04).

Initial diagnosis of electronic throttle control is performed after memory clearance. Wait for 10 seconds or more after turning the ignition switch to ON, and then start the engine.

6. MODE $06

Refer to diagnostic 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.

NOTE:

Some items are not displayed according to the specifications.

OBDMID

TID

SID

Diagnostic item

$01

$84

$1E

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

$85

$1E

$86

$20

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

$91

$20

$92

$10

$A3

$20

$A4

$10

$AC

$10

$AD

$10

$AE

$10

$AF

$10

$CD

$20

$CF

$20

$DF

$10

$02

$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

$BD

$10

$D1

$10

Oxygen sensor delay failure (Bank 1 Sensor 2)

$D2

$01

$05

$84

$1E

A/F sensor range failure (Bank 2 Sensor 1)

$85

$1E

$86

$20

A/F sensor response failure (Bank 2 Sensor 1)

$91

$20

$92

$10

$A3

$20

$A4

$10

$AC

$10

$AD

$10

$AE

$10

$AF

$10

$CE

$20

$D0

$20

$DF

$10

$06

$07

$0B

Oxygen sensor drop failure (Bank 2 Sensor 2)

$08

$0B

$A5

$0B

$05

$10

Oxygen sensor response failure (Bank 2 Sensor 2)

$06

$10

$BD

$10

$D1

$10

Oxygen sensor delay failure (Bank 2 Sensor 2)

$D2

$01

$21

$89

$20

Catalyst deterioration diagnosis (Bank 1)

$22

$89

$20

Catalyst deterioration diagnosis (Bank 2)

$31

$8A

$FD

EGR system diagnosis

$35

$8B

$9D

VVT monitor (Bank 1)

$8C

$9D

$8D

$9D

$8E

$9D

$D3

$9D

$D5

$9D

$D6

$9D

$36

$8B

$9D

VVT monitor (Bank 2)

$8C

$9D

$8D

$9D

$8E

$9D

$D3

$9D

$D5

$9D

$D6

$9D

$3C

$C1

$FE

Evaporative emission control system (0.02 inch leak)

$C2

$FE

$C3

$FE

$C4

$FE

$C5

$FE

$C6

$35

$C7

$FE

$C8

$FE

$C9

$FE

$CA

$FE

$3D

$E2

$FE

Purge flow

$41

$9B

$14

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

$42

$A2

$24

Oxygen sensor heater characteristics failure (Bank 1 Sensor 2)

$45

$9B

$14

A/F sensor heater characteristics failure (Bank 2 Sensor 1)

$46

$A2

$24

Oxygen sensor heater characteristics failure (Bank 2 Sensor 2)

$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

$A6

$0B

$24

Misfire monitoring (#5 cylinder)

$0C

$24

$A7

$0B

$24

Misfire monitoring (#6 cylinder)

$0C

$24

7. MODE $07

Refer to the data of DTC (pending code) for troubleshooting result about emission in the first time.

8. MODE $08 (REQUEST CONTROL FOR ON-BOARD SYSTEM, TEST, AND COMPONENT)

Perform “Active Test” of the on-board system.

9. MODE $09

Refer to the data of the vehicle specification.

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