Valve Timing Control System (SENTRA 1.8L): Notes

Valve timing control system consists of intake camshaft pulley and advance/retard mechanism, valve timing control solenoid and oil control valve. See Figure. Valve timing control is used to increase engine performance by advancing or retarding intake camshaft.

Intake valve opening and closing points are controlled by ECM according to engine operating conditions. This affects overall torque curve by allowing more favorable torque applications at low-to-medium speeds. Inputs from coolant temperature, throttle position and mass airflow sensors, as well as engine RPM and gear position, are used by ECM to determine operation.