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Home >> Toyota >> 2005 >> Sequoia Limited, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Emission Control System >> Emission Control System >> Purpose

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:

Fig 1: Emission Control System Function Chart
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Remark: * For inspection and repair of the SFI system, refer to the SF section in this manual.