DTC P0081-00: Intake Valve Control Solenoid Circuit: General Description

The Oil Control Valve (OCV) is an integral part of the Continuous Variable Valve Timing (CVVT) system. The oil control valve controls the flow of engine oil in the Continuous Variable Valve Timing (CVVT) system actuator assembly. As the ECM controls the duty cycle of the Oil Control Valve (OCV), oil pressure/flow advances or retards the cam timing. Duty cycles near 0% or 100% represent rapid movement of the camshaft. Retaining a fixed camshaft position is accomplished by dithering (oscillating) the Oil Control Valve (OCV) duty cycle. The ECM calculates and determines the desired camshaft position. It continually updates the OCV duty cycle until the desired position is achieved. With the appliance of Continuous Variable Valve Timing (CVVT) system, engine power, fuel efficiency and the quality of exhaust gas are improved.