Toyota 12261-50060 Hose, Ventilation

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The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors, circulating fresh air from the air cleaner through the crankcase to mix with blow-by gases before being drawn through a PCV valve into the intake manifold. It consists of the PCV valve and two hoses: one connecting the air filter housing to the crankcase and the other, containing the PCV valve, connecting the crankcase to the intake manifold. To maintain idle quality, the PCV valve restricts flow when intake manifold vacuum is high, but under abnormal conditions, it allows excessive blow-by gases to flow back into the air cleaner for combustion. Although there is no scheduled inspection interval for the PCV valve or hoses, efficiency may decline over time due to sludge buildup, leading to symptoms like leaking seals from pressure buildup. Regular inspection and cleaning of the hoses during oil changes or other maintenance tasks are advisable, and any cracked or deteriorated hoses should be replaced. For component replacement, the fresh air inlet hose can be removed by sliding back the spring-type clamps and disconnecting it from both the air filter housing and the right valve cover pipe. The crankcase ventilation hose is similarly removed by disconnecting it from the PCV valve and intake manifold. The PCV valve itself is accessed after removing the crankcase ventilation hose and can be unscrewed from the left valve cover. Hoses should be inspected for clogs or dirt, cleaned if necessary, and replaced if damaged. The PCV valve should also be checked for clogs, cleaned with solvent, and replaced if residue cannot be removed. Installation follows the reverse order of removal.