Valve Timing Control System (1.6L): 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 the intake camshaft.

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