Evaporative Emissions System: Description and Operation

Evaporative Emission Control System:

The ECA determines the engine operating condition from various sensors and switches and will operate the No. 1 and No. 2 solenoid valves when specific conditions exist:

When the vehicle is operating at 50°C (122°F) outside air temperature and engine coolant temperature above 50°C (122°F) the No. 1 solenoid valve opens allowing the canister to purge through the No.1 purge control valve.

When the vehicle is operating at above 1500 rpm with wide open throttle, the No. 2 solenoid valve is also opened to allow additional canister purging through the No. 3 purge control valve.