CVVT Oil Control Valve (OCV)

Specifications

Specification

CVVT Oil Control Valve (OCV)

[Bank 1/Exhaust]

Description and Operation

Description

The Continuously Variable Valve Timing (CVVT) system advances or retards the intake and exhaust valve timing according to the control signal from the ECM, which is calculated based on engine speed and load.

CVVT control provides valve overlap or underlap, which improves fuel economy and reduces exhaust emissions (NOx, HC) and improves engine performance by reducing pumping losses, internal exhaust gas recirculation effect, improving combustion stability, improving volumetric efficiency, and increasing expansion work.

This system consists of the following:

- The CVVT oil control valve (OCV) supplies engine oil to the cam phaser or drains engine oil from the cam phaser according to the PWM (Pulse Width Modulation) control signal from the ECM.

- and the Cam Phaser, which changes the camshaft phase using hydraulic pressure from the engine oil.

Engine oil flowing from the CVVT oil control valve changes the camshaft phase in the advance direction (intake advance / exhaust retard) or in the opposite direction (intake retard / exhaust advance) relative to engine rotation, by rotating the rotor connected to the camshaft inside the cam phaser.

Circuit Diagrams

Wiring Diagram

Repair Procedures

Inspection

1. 1

   Turn the ignition off.

2. 2

   Disconnect the OCV connector.

3. 3

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

   

4. 4

   Make sure the resistance is within specification.

   Specification: 6.9–7.9 Ω [20 °C]

Removal

1. 1

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

2. 2

   Disconnect the CVVT oil control valve connector (A).

3. 3

   Remove the mounting bolt, then remove the valve (B) from the engine.

   CVVT oil control valve mounting bolt:

   9,8–11.8 N·m

   [Bank 1 / Exhaust]

   

Installation

1. Installation is the reverse of removal.