California

DESCRIPTION
The evaporative emission (EVAP) control system prevents the fuel vapor which is generated inside the fuel tank from escaping into the atmosphere. The fuel vapor which is generated inside the fuel tank passes through the fuel tank pressure control valve and vapor pipes and hoses, and is temporarily collected in the EVAP canister.

OPERATION
While the engine is running, the fuel vapor which has collected in the EVAP canister is drawn into the intake manifold through the EVAP purge solenoid and the purge port, and is then sent to the combustion chamber.

Two types of EVAP purge solenoid are used. When the engine is idling after having warmed up, only the EVAP purge solenoid for small amounts of flow (No. 1) is duty controlled. At times other than the above, the EVAP purge solenoid for large amounts of flow (No. 2) is also duty controlled. This allows fine adjustments in purge control to be carried out to efficiently reduce emission levels.