Hyundai Palisade: Engine Control System / CVVT Oil Control Valve (OCV)

Hyundai Palisade (LX2) 2020-2024 Service Manual / Engine Control/Fuel System / Engine Control System / CVVT Oil Control Valve (OCV)

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 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 spills 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 which is supplied through 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.
CVVT Oil Control Valve (OCV) [Banks 1, 2 / Exhaust]

Hyundai Palisade. Description and operation

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

Troubleshooting
Signal Waveform

Hyundai Palisade. Troubleshooting

Hyundai Palisade. Troubleshooting

Schematic diagrams
Circuit Diagram

Hyundai Palisade. Schematic diagrams

Harness Connector

Hyundai Palisade. Schematic diagrams

Repair procedures
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 : 6.9 - 7.9Ω [20°C (68°F)]
Removal
CVVT Oil Control Valve [Bank 1 / Exhaust]
1.
Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
2.
Remove the cylinder head cover.
(Refer to Engine Mechanical System - "Cylinder Head Assembly")
3.
Remove the installation bolt (A), and then remove the 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)

Hyundai Palisade. Repair procedures

CVVT Oil Control Valve [Bank 2 / Exhaust]
1.
Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
2.
Remove the cylinder head cover.
(Refer to Engine Mechanical System - "Cylinder Head Assembly")
3.
Remove the installation bolt (A), and then remove the 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)

Hyundai Palisade. Repair procedures

Installation
Hyundai Palisade. Repair procedures   
Install the component to the specified torque.
Note that internal damage may occur if the component drops. In this case, inspect it before installation.
Apply the engine oil to the valve O-ring.
Exactly distinguish the color of the valve and harness connectors in banks 1 and 2 when installing, or the engine will operate abnormally (Refer to the table below).
Items
Component Side
Harness Side
Bank 1 (RH)
Grey
Bank 2 (LH)
Black

1.
Install in the reverse order of removal.

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