Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Fuel Injection System MSA5TCD00L18170

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MSA5TCD00L18170


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                               MECHANISM AND FUNCTION                                  [M7B0]     2-7
                                                                         7. On-board Diagnosis System


7. On-board Diagnosis System
A: GENERAL
D The on-board diagnosis system detects and indicates a fault in various inputs and outputs of
the complex electronic control. The malfunction indicator lamp (CHECK ENGINE light) on the
instrument panel indicates occurrence of a fault or trouble.
D When the malfunction indicator lamp comes on by the ECM having diagnosed occurrence of
faults, the diagnostic trouble code (DTC) and the freeze frame engine condition are stored in the
ECM.
D On the OBD-II conformable car, it is necessary to connect the Subaru Select Monitor (SSM) or
General Scan Tool (GST) to data link connector in order to check the DTC.
D The SSM and GST not only can read out the DTC but also can erase the DTC or read out the
freeze frame data and other pieces of engine data.
D Further, against such a failure or sensors as may disable the drive, the fail-safe function is pro-
vided to ensure the minimal driveability.

B: FAIL-SAFE FUNCTION
For the part which has been judged faulty in the on-board diagnosis, the ECM generates the
associated pseudo signal (only when convertible to electric signal) and carries out the computa-
tional processing. In this fashion, the fail-safe function is performed.




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2-7    MECHANISM AND FUNCTION


MEMO




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