Toyota Sequoia (2005). Manual — part 680
EC087–03
–
EMISSION CONTROL
EMISSION CONTROL SYSTEM
EC–1
2709
EMISSION CONTROL SYSTEM
PURPOSE
The emission control systems are installed to reduce the amount of HC, CO and NOx exhausted from the
engine ((3) and (4)), 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) Three–Way Catalytic Converter
(4) Sequential Multiport Fuel Injection*
PCV
EVAP
TWC
SFI
Reduces HC
Reduces evaporated HC
Reduces HC, CO and NOx
Injects a precisely timed, optimum amount of fuel for reduced exhaust
emissions
Remark: * For inspection and repair of the SFI system, refer to the SF section in this manual.
EC0NO–01
B17454
VSV for EVAP
Charcoal Canister
PCV Valve
EVAP Service
Port
Air Drain Hose
VENT Line
Filter
Purge Line
EC–2
–
EMISSION CONTROL
PARTS LAYOUT AND SCHEMATIC DRAWING
2710
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION
B17534
TWC
TWC
Air Pump Assembly
VSV for Secondary
Air Injection System
Air Switching Valve No.2
Pressure Sensor
Air Switching Valve
Air Injection Control Driver
–
EMISSION CONTROL
PARTS LAYOUT AND SCHEMATIC DRAWING
EC–3
2711
EC089–06
B17455
Charcoal
Canister
VSV for EVAP
Air Injection
Control Driver
TWC
EVAP
Service
Port
Purge Line
VENT Line
ECM
Fuel Tank
Air Filter
ECM
To Intake Manifold
Pump Module
M
P
Pressure
Sensor
Pump Motor
Vent Valve
Refueling Valve
Air Inlet Line
M
P
Air Switching
Valve
Air Switching
Valve No.2
VSVs
Air Pump
Pressure
Sensor
EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
SECONDARY AIR INJECTION SYSTEM
EC–4
–
EMISSION CONTROL
PARTS LAYOUT AND SCHEMATIC DRAWING
2712
DRAWING
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