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 MSA5TCD00L18129

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2-1     [M100]              MECHANISM AND FUNCTION
1. System Application

1. System Application
There are three emission control systems which are as follows:
D Crankcase emission control system
D Exhaust emission control system
  D Three-way catalyst system
  D A/F control system
  D Ignition control system

                                         MECHANISM AND FUNCTION                                                  [M100]     2-1
                                                                                                           1. System Application

D Evaporative emission control system
  D ORVR (On-board Refueling Vapor Recovery) System
Item                                 Main components       Function
Crankcase emission control           PCV valve             Draws blow-by gas into intake manifold from crankcase and burns it
system                                                     together with air-fuel mixture. Amount of blow-by gas to be drawn in
                                                           is controlled by intake manifold pressure.
Exhaust           Catalyst   Front   Three-way catalyst    Oxidizes HC and CO contained in exhaust gases as well as reducing
emission          system                                   NOx.
system            A/F control        ECM (Engine control   Receives input signals from various sensors, compares signals with
                  system             module)               stored data, and emits a signal for optimal control of air-fuel mixture
                                     Front oxygen (A/F)    Detects quantity of oxygen contained exhaust gases.
                                     Rear oxygen sensor    Detects density of oxygen contained exhaust gases.
                                     Throttle position     Detects throttle position.
                                     Intake manifold       Detects absolute pressure of intake manifold.
                                     pressure sensor*1
                                     Intake air tempera-   Detects intake air temperature of air cleaner case.
                                     ture sensor*1
                                     Intake air tempera-   Detects absolute pressure of intake manifold.
                                     ture and pressure
                                     sensor*2              Detects intake air temperature of intake manifold.

                  Ignition control   ECM                   Receives various signals, compares signals with basic data stored in
                  system                                   memory, and emits a signal for optimal control of ignition timing.
                                     Crankshaft position   Detects engine speed (Revolution).
                                     Camshaft position     Detects reference signal for combustion cylinder discrimination.
                                     Engine coolant tem-   Detects coolant temperature.
                                     perature sensor
                                     Knock sensor          Detects engine knocking.
Evaporative emission control         Canister              Absorbs evaporative gas which occurs in fuel tank when engine
system                                                     stops, and sends it to combustion chambers for a complete burn
                                                           when engine is started. This prevents HC from being discharged
                                                           into atmosphere.
                                     Purge control         Receives a signal from ECM and controls purge of evaporative gas
                                     solenoid valve        absorbed by canister.
                                     Pressure control      Receives a signal from ECM and controls evaporative gas pressure
                                     solenoid valve        in fuel tank.
ORVR system                          Vent valve            Controls evaporation pressure in fuel tank.
                                     Drain valve           Closes the evaporation lline by receiving a signal from ECM to check
                                                           the evaporation gas leak.
*1: MT vehicles
*2: AT vehicles


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