Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1998 1998 Service Manual DIAGNOSTICS SECTION ON-BOARD DIAGNOSTICS II SYSTEM MSA5TCD98L21314
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2-7 [T3A1] ON-BORAD DIAGNOSTICS II SYSTEM
3. Diagnosis System
3. Diagnosis System 4) When ignition switch is turned to ON (engine
off) or to "START" with the test mode connector
A: CHECK ENGINE MALFUNCTION connected, the MIL blinks at a cycle of 3 Hz.
INDICATOR LAMP (MIL)
1. ACTIVATION OF CHECK ENGINE
MALFUNCTION INDICATOR LAMP (MIL)
1) When ignition switch is turned to ON (engine
off), the CHECK ENGINE malfunction indicator
lamp (MIL) in the combination meter illuminates.
NOTE:
If the MIL does not illuminate, perform diagnostics
of the CHECK ENGINE light circuit or the combi- OBD0055A
nation meter circuit.
B: OBD-II GENERAL SCAN TOOL
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 the data link connector located in the
lower portion of the instrument panel (on the driv-
B2M0470C er's side), to the lower cover.
2) After starting the engine, the MIL goes out. If it
does not, either the engine or the emission control
system is malfunctioning.
OBD0006F
OBD0053A
3) If the diagnosis system senses a misfire which
could damage the catalyzer, the MIL will blink at a
cycle of 1 Hz.
B2M0433D
OBD0054A
44
ON-BORAD DIAGNOSTICS II SYSTEM [T3B2] 2-7
3. Diagnosis System
3) Using the OBD-II general scan tool, call up
diagnostic 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
diagnostic trouble codes
(4) MODE $04: Clear/Reset emission-related
diagnostic information
(5) MODE $05: Oxygen sensor monitoring test
results
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,
refer to the DIAGNOSTIC TROUBLE CODE (DTC)
LIST. (LHD), (RHD)
2. DATA LINK CONNECTOR (FOR OBD-II GENERAL SCAN TOOL AND SUBARU SELECT
MONITOR)
1) This connector is used both for OBD-II general scan tools and the Subaru Select Monitor.
2) Terminal No. 4 to No. 6 of the data link connector is used for the Subaru Select Monitor signal.
CAUTION:
Do not connect any scan tools other than the OBD-II general scan tools and the Subaru Select
Monitor, because the circuit for the Subaru Select Monitor may be damaged.
H2M1280
Terminal No. Contents Terminal No. Contents
1 Power supply 9 Blank
2 Blank 10 K line of ISO 9141 CARB
3 Blank 11 Blank
Subaru Select Monitor signal (ECM to Subaru
4 12 Ground
Select Monitor)*
Subaru Select Monitor signal (Subaru Select
5 13 Ground
Monitor to ECM)*
6 Subaru Select Monitor clock* 14 Blank
7 Blank 15 Blank
8 Blank 16 Blank
*: Circuit only for Subaru Select Monitor
45
2-7 [T3B3] ON-BORAD DIAGNOSTICS II SYSTEM
3. Diagnosis System
3. CURRENT POWERTRAIN DIAGNOSTIC DATA (MODE $01)
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.
PID Data Unit of measure
01 Number of emission-related powertrain trouble codes and MIL status ON/OFF
03 Fuel system control status --
04 Calculated engine load value %
05 Engine coolant temperature ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo