The Nissan Altima Canister Purge Valve is a valve that controls the flow of vapors from the charcoal canister to the intake manifold. It is responsible for transferring the gas vapors that are stored in the canister. This allows the vapors to undergo combustion in the engine's combustion chambers, rather than being released into the air. When engine vacuum and temperature conditions are right, this Canister Purge Valve opens to draw fresh air through the carbon bed for sweeping hydrocarbons into the engine, where they join the normal air fuel mix and cut smog-producing emissions. The earlier Altima vehicles utilized a simple vacuum controlled Canister Purge Valve that switched flow by manifold suction only. Later OBD-II Nissan versions began using an electronically commanded Canister Purge Valve, a solenoid that the engine computer will pulse on and off during self-checks. When the Canister Purge Valve closes, the vent solenoid will shut, and the computer can seal the system. The tank pressure sensor must see a steady vacuum to confirm no leaks. No matter what generation, it is common for customers to notice that Nissan designs for durability. However, a sticking valve can elevate emissions and trigger the dash light that tells Altima owners to address vapor control promptly.
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