Kia Sportage: CVVT Oil Control Valve (OCV)

Description and Operation

 Description

Continuous Variable Valve Timing (CWT) 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.

Specifications

  Specifications

Schematic Diagrams

 Circuit Diagram

Repair procedures

Inspection

1. Turn the ignition switch OFF.

2. Disconnect the OCV connector.

3. Measure resistance between the OCV terminals 1 and 2.

4. Check that the resistance is within the specification.

Specification: Refer to "Specification"

Removal

[Bank 1 / Intake]

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.

2. Remove the OTS (A).

3. Disconnect the CVVT oil control valve connector (B).

4. Remove the installation bolt (C), and then remove the valve from the engine.

[Bank 1 / Exhaust]

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.

2. Disconnect the CVVT oil control valve connector (A).

3. Remove the installation bolt (B), and then remove the valve from the engine.

Installation

CAUTION

• Install the component with the specified torques.
• Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

CAUTION

• Apply engine oil to the valve O-ring.

1. Installation is reverse of removal.

CVVT oil control valve installation bolt: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m. 7.2 ~ 8.7 lb-ft)

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