What is EVAP Emission Control System Vent Circuit MALF?
The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. 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 proper pressure during the active EVAP leak test.
What is a evaporative emission system vent control circuit?
OBD-II Code P0446 is defined as a Evaporative System Vent Control Circuit Malfunction. The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap).
How do I fix error code P0449?
What repairs can fix the P0449 code?
- Repairing or replacing the wiring harness.
- Replacing the charcoal canister vent valve.
- Repairing faulty electrical connections.
- Replacing faulty ECU.
What does evaporative emission control system vent valve malfunction mean?
Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction What does that mean? This code is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model.
How does the ECM work on an EVAP vent?
The ECM’s driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set.
What is the code for the EVAP vent?
The evap vent valve in most makes and models depends on a supply of a 12V battery voltage with key on. The ECM driver closes this valve when grounded and will set code P0446 if there is an open or short to ground or battery voltage or it is not possible to form a vacuum seal.
What are the components of the EVAP system?
The EVAP system is primarily composed of the gas tank, gas cap, vent valve, purge valve, and charcoal canister. To help make sense of this, first, you need to know what the EVAP system is. Basically, it’s a collection of components working together to prevent fuel vapors from entering the atmosphere.