Subaru Impreza 2003, Service Manual

Page: 1206 / 3610

EN(H4DOTC)-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) Open the cover and connect the OBD-II general
scan tool to data link connector located in the lower
portion of instrument panel (on the driver's side).
3) Using the OBD-II general scan tool, call up DTC
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
DTC
(4) MODE $04: Clear/Reset emission-related
diagnostic information
Read out the data according to repair procedures.
(For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.)
NOTE:
For details concerning DTC, refer to the List of Di-
agnostic Trouble Code (DTC). <Ref. to
EN(H4DOTC)-75, List of Diagnostic Trouble Code
(DTC).>
2. MODE $01 (CURRENT POWERTRAIN DI-
AGNOSTIC DATA)
Refers to data denoting the current operating con-
dition of analog input/output, digital input/output
and/or the powertrain system.
A list of the support data and PID (Parameter Iden-
tification) 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-01287
PID Data Unit of measure
01 Number of emission-related powertrain DTC and malfunction indicator light status ON/OFF
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
°
0F Intake air temperature
°
C
10 Air flow rate from manifold absolute pressure sensor g/sec
11 Throttle valve opening angle %
13 Check whether oxygen sensor is installed. —
15 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank
2 V and %
24 A/F sensor 1 output voltage and short term fuel trim associated with A/F sensor 1 V and %
1C On-board diagnosis system —