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
2
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.
NOx
Rear
control
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
ratio.
Front oxygen (A/F) Detects quantity of oxygen contained exhaust gases.
sensor
Rear oxygen sensor Detects density of oxygen contained exhaust gases.
Throttle position Detects throttle position.
sensor
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).
sensor
Camshaft position Detects reference signal for combustion cylinder discrimination.
sensor
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
3
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