Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 12. FUEL INJECTION (FUEL SYSTEM) 01. General

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01. General


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W1860BE.book Page 2 Tuesday, January 28, 2003 11:01 PM




                                                          GENERAL
 FUEL INJECTION (FUEL SYSTEM)


 1. General
   The Multipoint Fuel Injection (MFI) system supplies optimum air-fuel mixture under every engine
 operating condition through the use of the latest electronic control technology.
 This system pressurizes the fuel to a constant pressure and injects it into each intake air port in the
 cylinder head. The injection quantity of fuel is controlled by an intermittent injection system where
 an electro-magnetic injection valve or injector opens for a short period that is precisely controlled
 depending on the quantity of air appropriate for each condition of operation. In actual control, an
 optimum fuel injection quantity is achieved by varying the duration of an electric pulse applied to the
 injector. This way of control enables simple, yet highly precise metering of the fuel.
   The engine control module (ECM) that controls the fuel injection system corrects the fuel injection
 amount depending on the vehicle speed, throttle opening, coolant temperature and other vehicle-
 operation-related information. The ECM receives the information in the form of electric signals from
 the corresponding sensors and switches.
 The MFI system also has the following features:
   Reduced exhaust emissions
   Reduced fuel consumption
   Increased engine output
   Quick response to accelerator and brake pedal operation
   Superior startability and warm-up performance in cold weather due to corrective controls made
 according to coolant and intake air temperatures




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