EC03K--01
--
EMISSION CONTROL
EMISSION CONTROL SYSTEM
EC--1
EMISSION CONTROL SYSTEM
P URP OS E
S
1 RZ: , 3 RZ -- F:
System
Abbreviation
Function
Positive crankcase ventilation
Fuel evaporative emission control
Throttle positioner
Spark control
PCV
EVAP
TP
SC
Reduces HC
Reduces evaporative HC
Reduces HC and CO
Improves drivability--cold
Auxiliary system:
(1) Automatic hot air intake
(2) Choke opener
(3) Choke breaker
(4) Auxiliary acceleration pump
(5) High altitude compensation
(6) Secondary air bleed
HAI
CO
CB
AAP
HAC
--
Improves drivability--cold
Improves drivability--cold
Improves drivability--cold
Improves drivability--cold
Improves drivability
Improves drivability
S
1RZ--E:, 2RZ--FE:, 3RZ--FE:
The emission control systems are installed to reduce the amount of CO, HC and NOx exhausted from
the engine ((3), (4) and (5)), to prevent the atmospheric release of blow--by gas--containing HC (1) and
evaporated fuel containing HC being released from the fuel tank (2).
The function of each system is shown in these table.
System
Abbreviation
Function
(1) Positive Crankcase Ventilation
(2) Evaporative Emission Control
(3) Exhaust Gas Recirculation
(4) Three--Way Catalytic Converter
(5) Electronic fuel injection *1
PCV
EVAP
EGR
TWC
EFI
Reduces blow--by gas (HC)
Reduces evaporated HC
Reduces NOx *2
Reduces CO, HC and NOx *2
Injects a precisely timing, optimum amount of fuel for reduce
exhaust emissions.
Remark: *1 For inspection and repair of the EFI system, refer to the EFI section this manual.
Remark: *2 2RZ--FE only.
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Pages From Supplement
3RZ-F,3RZ-FE