Toyota Sequoia (2005). Manual - part 680

EC087–03

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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

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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

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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

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EMISSION CONTROL

PARTS LAYOUT AND SCHEMATIC DRAWING

2712

DRAWING