Subaru Legacy III (2000-2003 year). Manual - part 104

EN(H4SO)-28

ENGINE (DIAGNOSTICS)

TRANSMISSION CONTROL MODULE (TCM) I/O SIGNAL

7. Transmission Control Module (TCM) I/O Signal

A: ELECTRICAL SPECIFICATION

<Ref. to AT-14, Transmission Control Module (TCM) I/O Signal.>

EN(H4SO)-29

ENGINE (DIAGNOSTICS)

DATA LINK CONNECTOR

8. Data Link Connector

A: NOTE

This connector is used both for OBD-II general scan tools and the Subaru Select Monitor.

CAUTION:
Do not connect any scan tools other than the OBD-II general scan tools and the Subaru Select Mon-
itor, because the circuit for the Subaru Select Monitor may be damaged.

EN-00037

12

11

10

9

13

15

14

16

3

2

1

7 8

4 5 6

Terminal No.

Contents

Terminal No.

Contents

1

Power supply

9

Blank

2

Blank

10

K line of ISO 9141 CARB

3

Blank

11

Blank

4

Blank

12

Ground

5

Blank

13

Ground

6

Blank

14

Blank

7

Blank

15

Blank

8

Blank

16

Blank

EN(H4SO)-30

ENGINE (DIAGNOSTICS)

OBD-II GENERAL SCAN TOOL

9. OBD-II General Scan Tool

A: OPERATION

1. HOW TO USE OBD-II GENERAL SCAN 
TOOL

1) Prepare a general scan tool (OBD-II general
scan tool) required by SAE J1978.
2) Connect the OBD-II general scan tool to the data
link connector (A) located in the lower portion of the
instrument panel (on the driver's side).

3) Using the OBD-II general scan tool, call up diag-
nostic trouble code(s) and freeze frame data.
OBD-II 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 di-
agnostic trouble codes
(4) MODE $04: Clear/Reset emission-related
diagnostic information

Read out data according to repair procedures. (For
detailed operation procedures, refer to the OBD-II
General Scan Tool Operation Manual.)

NOTE:
For details concerning diagnostic trouble codes, re-
fer to the List of Diagnostic Trouble Code (DTC).
<Ref. to EN(H4SO)-83, List of Diagnostic Trouble
Code (DTC).>

2. MODE $01 (CURRENT POWERTRAIN DIAGNOSTIC DATA)

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

NOTE:
Refer to OBD-II general scan tool manufacturer's instruction manual to access generic OBD-II PIDs (MODE
$01).

EN-00710

( A )

PID

Data

Unit of measure

01

Number of emission-related powertrain trouble codes and MI status

ON/OFF and num-

ber

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 revolution

rpm

0D

Vehicle speed

km/h

0E

Ignition timing advance

°

10

Air flow rate from pressure sensor

g/sec

11

Throttle valve opening angle

%

13

Check whether oxygen sensor is installed.

—

14

Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 
1

V and %

15

Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 
2

V and %

1C

On-board diagnosis system

—

EN(H4SO)-31

ENGINE (DIAGNOSTICS)

OBD-II GENERAL SCAN TOOL

3. MODE $02 (POWERTRAIN FREEZE FRAME DATA)

Refers 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 OBD-II general scan tool manufacturer's instruction manual to access freeze frame data (MODE
$02).

4. MODE $03 (EMISSION-RELATED POW-
ERTRAIN DIAGNOSTIC TROUBLE CODE)

Refer to Read Diagnostic Trouble Code for infor-
mation about data denoting emission-related pow-
ertrain diagnostic trouble codes. <Ref. to
EN(H4SO)-39, Read Diagnostic Trouble Code.>

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

Refers to the mode used to clear or reset emission-
related diagnostic information (OBD-II trouble diag-
nostic information).

NOTE:
Refer to OBD-II general scan tool manufacturer's
instruction manual to clear or reset emission-relat-
ed diagnostic information (MODE $04).

PID

Data

Unit of measure

02

Trouble code that caused CARB required freeze frame data storage

—

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 revolution

rpm

0D

Vehicle speed

km/h