VVT (Variable Valve Timing) System: Notes

VVT (Variable Valve Timing) System controls the cam pulley phase to adjust the valve timing to the optimize timing. The engine oil pressure controls VVT pulley. OCV (Oil Control Valve) is located in front of the cylinder head and changes the pulley phase by changing the engine oil passage. ECM controls OCV solenoid by PWM signal to adjust the phase to the target.

Fig 1: Identifying VVT (Variable Valve Timing) System

Courtesy of ISUZU MOTOR CO.