Subaru Legacy III (2000-2003 year). Service 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
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