DTC Description

The PCM detects a leak across the purge valve by measuring an increase in evaporative system vacuum. A leak across the purge valve can allow hydrocarbons from the tank to leak to the atmosphere when the engine is off. Checking output signals from tank vacuum under detecting condition, if tank vacuum is higher than threshold for more than 2 sec, PCM sets P0441 and MIL (Malfunction Indication Lamp) turns on.