Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 07 ecsy purp

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                                                                                                                                      EC-1
                                            EMISSION CONTROL      -    EMISSION CONTROL SYSTEM


EMISSION CONTROL SYSTEM
                                                                                                                                      EC026-04


PURPOSE
The emission control systems are installed to reduce the amount of CO, HC 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                   PCV              Reduces HC
(2) Evaporative Emission Control                     EVAP             Reduces evaporated HC
(3) Warm Up Three-Way Catalytic Converter           WU-TWC            Reduces HC, CO and NOx
(4) Three-Way Catalytic Converter                    TWC              Reduces HC, CO and NOx
(5) Sequential Multiport Fuel injection*              SFI             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 of this manual.




2001 SIENNA (RM787U)

                                                                               Author :                     Date :                    1061

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