KIA Niro: CVVT Oil Control Valve (OCV)

Specification

Bank 1 / Exhaust

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 overlap or underlap occurs, which in turn improves fuel efficiency, reduces exhaust gases (NOx, HC) and improves engine performance by reducing pumping loss,
generating internal EGR effect, improving combustion stability, improving volumetric efficiency and increasing 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 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 released from 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.

Bank1 / Intake

Bank 1 / Exhaust

Circuit Diagram

Harness Connector

OCV (B1/EX)

Inspection

1. Switch "OFF" the ignition.
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 Ω (20ºC(68ºF))

CVVT Oil Control Valve (OCV) Repair procedures

Removal

CVVT Oil Control Valve

CVVT Oil Control Valve (Intake)

1. Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
2. Remove the variable force solenoid.

   (Refer to Engine Control System - " Variable Force Solenoid")

3. Remove the cylinder head cover.

   (Refer to Engine Mechanical System - "Cylinder Head Cover")

4. Remove the CVVT oil control valve (A) using a socket & wrench (B).

CVVT oil control valve center bolt : (47.1 - 52.0 N.m (4.8 - 5.3 kgf.m, 34.7 - 38.3 lb-ft)) + (25 - 31º)

Warning

• To prevent impurities from entering intake OCV & center bolt, wear rubber gloves.
• When removing the intake OCV & center bolt, place a wrench (B) at position (A) to prevent the camshaft from rotating.

CVVT Oil Control Valve (Exhaust)

1. Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
2. Remove the air cleaner assembly.

   (Refer to Engine Mechanical System - "Air Cleaner")

3. OCV connector (A).
4. Remove the mounting bolt, and then remove oil control valve from the engine.

CVVT oil control valve mounting bolt : 9.8 - 11.8 N*m (1.0 - 1.2 kgf*m, 7.2 - 8.7 lb*ft)

Installation

Warning

• 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.
• To prevent impurities from entering intake OCV & center bolt, wear rubber gloves.
• When installing the intake OCV & center bolt, place a wrench (B) at position (A) to prevent the camshaft from rotating.

1. Install in the reverse order of removal.

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