Toyota 12204-0P020 Valve Sub-Assembly, Vent

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On all models except 1AR-FE four-cylinder engines, the PCV valve is located in the valve cover. On 1AR-FE models, the PCV valve is mounted in the crankcase breather on the front side of the engine block. On 1AR-FE models, remove the intake manifold. On all models, disconnect the hose. On models with a rubber grommet, pull the PCV valve from the cover; on all other models unscrew the PCV valve from the cover or breather. On all models except 1AR-FE four--cylinder engines, remove the valve from the hose. On all models, remove the valve, then blow through the valve from the valve cover or breather case end. With the engine idling at normal operating temperature, place your finger over the valve opening. If there's no vacuum at the valve, check for a plugged hose or valve. Replace any plugged or deteriorated hoses. Turn off the engine. If air will not pass through the valve in this direction, replace it with a new one. When purchasing a replacement PCV valve, make sure it's for your particular vehicle and engine size. Compare the old valve with the new one to make sure they're the same.

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.