Toyota 15330-21011 Valve Assy, Camshaft Timing Oil Control

The VVT system is utilized across all models, varying intake camshaft timing by directing oil pressure to adjust the intake camshaft sprocket actuator assembly, which enhances engine power output, fuel economy, and reduces emissions under specific conditions. Key components include the Powertrain Control Module (PCM), VVT oil control valve (OCV), OCV filter, and intake camshaft sprocket actuator assembly. The PCM activates the oil control valve based on inputs from various sensors, directing oil pressure to either advance or retard the camshaft. The actuator assembly features an inner hub with fixed vanes that utilize oil pressure to rotate the camshaft, allowing for adjustments of up to 21 degrees. Regular checks of the VVT system begin with inspecting the oil control valve filter for clogs, as issues often arise from the valve and filter, necessitating routine oil and filter changes. The operation of the oil control valve is assessed by measuring resistance and checking the plunger's movement when voltage is applied. The final check involves removing the valve cover and intake camshaft to clean the camshaft snout and ensure proper installation of the actuator assembly, which should rotate freely when air pressure is applied. If any components do not function correctly, replacements are necessary, and reassembly follows the reverse order of disassembly.