Hyundai Veloster: CVVT Oil Control Valve (OCV). Description and Operation

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) and improves engine performance through reduction of pumping loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.

This system consist of

- the CVVT Oil Control Valve (OCV) which supplies the engine oil to the cam phaser or cuts the engine oil from the cam phaser in accordance with the ECM PWM (Pulse With Modulation) control signal,

- the CVVT Oil Temperature Sensor (OTS) which measures the engine oil temperature,

- and the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil.

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.

Purge Control Solenoid Valve (PCSV). Repair procedures

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

CVVT Oil Control Valve (OCV). Specifications

Specification Item Specification Coil Resistance (Ω) 6.9 ~ 7.9 [20°C(68°F)] ...

See also:

Fuel Tank Pressure Sensor (FTPS). Repair procedures
Inspection 1. Connect the GDS on the Data Link Connector (DLC). 2. Measure the output voltage of the FTPS. Specifica ...

Input Speed Sensor 2 > Repair procedures
Inspection Refer to DTC code "P2765, P2766" Input Shaft Speed Sensor. Removal 1. Remove the under cover. 2. Disconnect the inp ...

Opening the fuel filler lid
The fuel filler lid must be opened from inside the vehicle by pulling the fuel filler lid opener switch. ✽ NOTICE If the fuel filler lid will not open because ice has formed around it, ta ...