Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 1999-2000 FUEL AND OBD II On-Board Diagnostics II System MSA5T0123A27479

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MSA5T0123A27479


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2-7   [T3A1]                                DIAGNOSTICS
3. Diagnosis System


3. Diagnosis System                                          3) If the diagnosis system senses a misfire which
                                                             could damage the catalyzer, the MIL will blink at a
A: CHECK ENGINE MALFUNCTION                                  cycle of 1 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-                                                     OBD0054A
nation meter circuit. 
                                                             4) When ignition switch is turned to ON (engine
                                                             off) or to "START" with the test mode connector
                                                             connected, the MIL blinks at a cycle of 3 Hz.




                                            S2M2025A

   (A)   Malfunction indicator lamp (MIL)

2) After starting the engine, the MIL goes out. If it                                               OBD0055A

does not, either the engine or the emission control
system is malfunctioning.
                                                             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-
                                                             er's side).
                                            OBD0053A




                                                                                                     S2M0258




                                                        16
                                             DIAGNOSTICS                                                     [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
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.

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
        4                                                             12         Ground
                   Subaru Select Monitor)*
                   Subaru Select Monitor signal (Subaru Select
        5                                                             13         Ground
                   Monitor to ECM)*
        6          Blank                                              14         Blank
        7          Blank                                              15         Blank
        8          Blank                                              16         Blank
*: Circuit only for Subaru Select Monitor




                                                             17
2-7   [T3B3]                               DIAGNOSTICS
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                                                             



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