Toyota 12204-31040 Valve Sub-Assy, Ventilation

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The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It circulates fresh air from the air cleaner through the crankcase, mixing it with blow-by gases. The mixture is rerouted through a PCV valve to the intake manifold. The PCV valve restricts flow when intake manifold vacuum is high, maintaining idle quality. In abnormal conditions, excessive blow-by gases flow back through the crankcase vent tube into the air cleaner for normal combustion. The PCV system consists of the PCV valve, blow-by filter, and vacuum hoses connecting these components to the engine. Regularly checking and replacing the PCV valve is important.

When purchasing a replacement PCV valve, make sure it is for your particular vehicle and engine size. Compare the old valve with the new one to ensure they are the same.

It achieves this by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases.

The intake manifold must be removed to replace the PCV valve or hose on 2010 and later four-cylinder models.

To disconnect the hose, simply detach it from the PCV valve. To unscrew the PCV valve from the cover, use a suitable tool to loosen and remove it.

While there's no fixed maintenance interval, the PCV system's efficiency can decrease over time due to sludge buildup within the PCV valve and hoses. This buildup might result in leaking seals, impacting overall system performance.

On 1AR-FE models, the intake manifold needs to be removed to access the PCV valve.

They are located in the valve cover for the rear cylinder bank, on the right (passenger's) side.