Kia Sorento: CVVT (Continuously Variable Valve Timing) System Description

Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the intake and exhaust valve in accordance with the ECM control signal which is calculated by the engine speed and load.

By controlling CVVT, the valve over-lap or under-lap occurs, which makes better fuel economy and reduces exhaust gases (NOx, HC). CVVT improves engine performance through reduction of pump loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.

This system consist of

The engine oil getting out of the CVVT oil control valve varies the cam phase in the direction (Intake Advance/Exhaust Retard) or opposite direction (Intake Retard/Exhaust Advance) of the engine rotation by rotating the rotor connected with the camshaft inside the cam phaser.

Catalytic Converter Installation

1. Install in the reverse order of removal. ...

CVVT (Continuously Variable Valve Timing) System Operation Principle

The CVVT has the mechanism rotating the rotor vane with hydraulic force generated by the engine oil supplied to the advance or retard chamber in accordance with the CVVT oil control valve con ...

See also:

Inspection
1. Turn the ignition switch OFF. 2. Disconnect the PCSV connector. 3. Measure resistance between the PCSV termi ...

Removal
1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2. Release the residual pressure in fuel line. (Refe ...

Removal
1. Turn the ignition switch OFF and disconnect the negative (-) battery cable. 2. Disconnect the accelerator position sensor connector (A). ...