System and Circuit Description

While engine running, ECM closes EVAP canister vent valve and opens EVAP canister purge valve. If EVAP control system is in good condition, EVAP control system pressure that detected by fuel pressure and temp, sensor becomes down. After that, ECM closes EVAP canister purge valve leaving EVAP canister vent valve is closed. If EVAP control system is in good condition, the fuel tank pressure rises specified rate.