Canister Purge Control Valve: Description and Operation

Fig. 3 Evaporative Emission Control System:

Fig. 4 EVAP System Operating Condition Chart:

The EVAP system employs a charcoal canister type system, Fig. 3. The charcoal canister system leads fuel vapor into the charcoal canister which uses activated carbon to absorb hydrocarbons (HC) emissions.

The separated HC emissions is drawn into the throttle body to be burnt together with the mixture in the combustion chamber when the bi-metal vacuum switching valve (BVSV) opens according to the engine coolant temperature.

Refer to Fig. 4 for EVAP system operating conditions.