Toyota 1 MZ–FE Manual page 196

EG2–196
EMISSION CONTROL SYSTEMS
DESCRIPTION
The emission control systems are installed to reduce the amount of HC, CO and NOx emitted from
the engine, and to also prevent release of evaporated fuel from the gasoline tank and prevent
atmospheric release of blow–by gas.
The system consists of the PCV, EVAP, EGR and TWC.
The function of each system is shown in the following table.
System
Positive crankcase ventilation
Evaporative emission control
Exhaust gas recirculation
Three–way catalytic converter
Sequential multiport fuel injection'
*For inspection and repair of the SFI system, refer to the SFI section.
1MZ–FE ENGINE – FE ENGINE – EMISSION CONTROL SYSTEMS
Abbreviation
Reduces blow–by gas
PCV
Reduces evaporative HC
EVAP
Reduces NOx
EGR
Reduces C0, HC and NOx
TWC
Regulates all engine conditions for reduction
SFI
of exhaust emissions.
Purpose