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 Emission Control System and Vacuum Fitting MSA5TCD00L18133

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2-1     [M500]                  MECHANISM AND FUNCTION
5. A/F Control System

5. A/F Control System
D The air/fuel control system compensates for the basic amount of fuel injection in response to a
signal sent from the front oxygen sensor to provide proper feedback control of the mixture. Thus,
the stoichiometric mixture ratio is maintained to provide effective operation of the three-way cata-
lyst. The basic amount of fuel injection is preset according to engine speed and loads, as well as
the amount of intake air.
D This system also has a "learning" control function which stores the corrected data in relation to
the basic amount of fuel injection in the memory map. A new air-fuel ratio correction is automatical-
ly added for quick response to the deviation of the air-fuel ratio. Thus, the air-fuel ratio is optimally
maintained under various conditions while stabilizing exhaust gases, improving driving perfor-
mance and compensating for changes in sensors' performance quality with elapse of time.


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