What is code po446?
P0446: Evaporative Emission Control System Vent Control Circuit. This generic OBD-II code indicates that the evaporative vent valve in the emission control system is malfunctioning. When this occurs, the EVAP system may not be capable of pressurizing and maintaining a vacuum seal.
What does the evaporative emission system do?
The evaporative emission control (EVAP) system captures gasoline fumes and other emissions produced when fuel evaporates within the gas tank or fuel system. The EVAP system then returns these vapors to the combustion process to keep harmful chemicals from reaching the air when the vehicle is not running.
How does the EVAP system work?
How the EVAP system works. The EVAP system traps fuel vapors from the fuel tank and temporarily stores them in the charcoal canister. As you drive, the vapors are purged from the canister and burned in the engine. The engine computer can monitor the EVAP system pressure using the fuel tank pressure sensor.
What are the parts of the emission system?
The emissions system is the method that your vehicle uses to keep its exhaust from being polluted as much as possible. Major parts in your emissions system include things like the catalytic converter, oxygen sensors, and the fuel cap.
What is emission control system malfunction?
Evaporative Emission Control System Malfunction. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When the ECU registers that there is a problem with the EVAP system it will throw the P0440 OBDII Code.
Where is the EVAP vent solenoid?
Note: The EVAP vent solenoid is typically located near the rear fuel cell. The solenoid is usually removed in order to fix the problem; however, in some cases, the solenoid is attached to a vent tube that is recommended be replaced at the same time.