Kia Optima: Engine Control System / CVVT Oil Control Valve (OCV)

Kia Optima DL3 2019-2020 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / CVVT Oil Control Valve (OCV)

Specifications
Specification

Item
Specification
Coil Resistance (Ω)
9.4 - 10.4 [20°C(68°F)]

Description and operation
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) 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 consists 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 PWM (Pulse With Modulation) control signal of ECM.

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

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

The engine oil transferred from the CVVT oil control valve changes the cam phase in the direction of the engine rotation (Intake Advance / Exhaust Retard) or the opposite (Intake Retard / Exhaust Advance) by rotating the rotor connected to the camshaft inside the cam phaser.

[Intake]

[Exhaust]

Components and components location
Components Location

1. Oil Control Valve (OCV) - Intake
2. Oil Control Valve (OCV) - Exhaust

Schematic diagrams
Circuit Diagram

Harness Connector

[Intake]

[Exhaust]

Repair procedures
Inspection
1.

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)

Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)

Sensor data : Checks the system input/output value status

(3)

Forced operation : Checks the system operating status

(4)

Additional function : Controls system options, zero point adjustment and other functions

Component 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: 9.4 - 10.4 [20°C (68°F)]

Removal
[Intake]
1.

Disconnect the negative battery terminal.

2.

Disconnect the CVVT oil control valve connector (A).

3.

Remove the CVVT oil control valve after loosening the mounting bolt (B).

Tightening torque :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

[Exhaust]
1.

Disconnect the negative battery terminal.

2.

Disconnect the CVVT oil control valve connector (A).

3.

Remove the CVVT oil control valve after loosening the mounting bolt (B).

Tightening torque :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

Installation
  

Install the component to the specified torque.

Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

Apply engine oil to the valve O-ring.

1.

Install in the reverse order of removal.

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