P0446 Explained (Simple Fix) - Vent Control Malfunction

Want to learn more? Check out our blog: https://ift.tt/2TE4kK5 How to use Digital Multimeter: https://www.youtube.com/watch?v=TdUK6RPdIrA The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module (ECM) and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve. Both the vent control valve and the purge valve are usually open when the engine is at normal operating temperature. However, the ECM occasionally performs leak tests to ensure the evaporative emission control system is working properly. During the leak test, the ECM closes the vent control valve and purge valve to create a vacuum. When P0446 is triggered, the ECM has detected a short in the circuitry to activate the vent control valve, or the EVAP system failed to maintain the vacuum during the active EVAP leakdown test. Need an OBD2 Sensor? www.fixdapp.com https://ift.tt/2F9JGqY FIXD March 16, 2019 at 10:58AM