Evap vent solenoid valve control system

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When the vent valve is closed, the evaporative emissions system is pressurized and tested for leaks. If it is sealed and no pressure is lost, the test passes. If the pressure drops, the engine control module assumes a leak is present and turns on the Check Engine light. One of the most common failures in the emissions system is the vent solenoid.

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Remove the spare tire to access the vent valve solenoid assembly on the fuel tank. This is located on the rear inboard side of the tank near the rear axle and drive shaft. Gently remove the wire and test the solenoid with the voltmeter to make sure it is working.Its definition is "Evaporative System Vent Control Circuit Malfunction." The code P0449 is set when your car's primary computer, the powertrain control module or PCM, detects that the actual state of the Evaporative Emission Control System vent valve doesn't match the desired state for a specific amount of time.

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The EVAP vent valve/control solenoid is mounted on a bracket by the fuel tank. The EAVP purge valve/control solenoid is mounted on the front top of the intake manifold. Just behind the area where ...Sep 27, 2021 · The purge valve controls the flow of vapors out of the EVAP system and into the engine air intake. When the engine is at its operating temperature, both the vent control valve and the purge valve are open. However, the engine control module periodically tests the valves for leaks, closing them and creating a vacuum. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The vent control valve (solenoid), or simply vent valve controls the flow of outside air in and out of the charcoal canister.

The Evaporative System canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the Engine Control Module . When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent.The control module tests for this by commanding the EVAP purge solenoid valve OFF(valve closed) and the vent solenoid valve ON(vent closed), sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum, while the engine is running.