Hyundai Palisade (LX2): Engine Control System / CVVT Oil Temperature Sensor (OTS)

Hyundai Palisade (LX2) 2020-2026 Service Manual / Engine Control/Fuel System / Engine Control System / CVVT Oil Temperature Sensor (OTS)

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 and 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 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.

Hyundai Palisade. Description and operation

Specifications

Specification

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	41.74 - 54.54
-20	-4	14.13 - 16.83
0	32	5.28 - 6.3
25	77	1.88 - 2.14
80	176	0.31 - 0.33
140	284	0.07 - 0.08

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 OTS connector.

3.	Remove the OTS.

4.	After immersing the thermistor of the sensor into engine coolant, measure resistance between the OTS terminals 1 and 2.

Check that the resistance is within the specification.

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	41.74 - 54.54
-20	-4	14.13 - 16.83
0	32	5.28 - 6.3
25	77	1.88 - 2.14
80	176	0.31 - 0.33
140	284	0.07 - 0.08

Removal

1.	Refer to Engine Mechanical System - "Oil Pressure Sensor"

Installation

1.	Refer to Engine Mechanical System - "Oil Pressure Sensor"

❮Rail Pressure Sensor (RPS)

Description and operation Description Installed on the delivery pipe, the Rail Pressure Sensor (RPS) measures the instantaneous fuel pressure in the delivery pipe.

Oil Pressure Sensor (OPS)❯

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.

Other information:

Hyundai Palisade (LX2) 2020-2026 Service Manual: Compressor

Description and operation Description The compressor is the power unit of the A/C system. It is located on the side of engine block and driven by a V-belt of the engine. The compressor changes low pressure and low temperature refrigerant gas into high pressure and high temperature refrigerant gas.

Hyundai Palisade (LX2) 2020-2026 Service Manual: Troubleshooting

Troubleshooting 1) After replacing H/UNIT, always check that the system operates properly. 2) If the failure persists after replacing the H/UNIT, do not replace the unit.