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

Hyundai Elantra (CN7) 2021-2024 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 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 consist 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 getting out of 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.

Specifications

Specification

Temperature [°C (°F)]	Resistance (kΩ)
-40 (-40)	125.53 - 136.70
-20 (-4)	63.89 - 71.23
0 (32)	26.83 - 30.07
20 (68)	11.13 - 12.48
40 (104)	4.89 - 5.50
60 (140)	2.32 - 2.61
80 (176)	1.17 - 1.32
100 (212)	0.63 - 0.71
120 (248)	0.37 - 0.41
140 (284)	0.22 - 0.25
160 (320)	0.14 - 0.16

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Turn ignition switch OFF.

2.	Remove the oil pressure & oil temperature sensor. (Refer to - "Removal")

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

Check that the resistance is within the specification.

Temperature [°C (°F)]	Resistance (kΩ)
-40 (-40)	125.53 - 136.70
-20 (-4)	63.89 - 71.23
0 (32)	26.83 - 30.07
20 (68)	11.13 - 12.48
40 (104)	4.89 - 5.50
60 (140)	2.32 - 2.61
80 (176)	1.17 - 1.32
100 (212)	0.63 - 0.71
120 (248)	0.37 - 0.41
140 (284)	0.22 - 0.25
160 (320)	0.14 - 0.16

Removal

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

2.	Lift the vehicle.

3.	Remove the engine room under cover. (Refer to Engine Mechanical System - "Engine Room Under Cover")

Disconnect the oil pressure & oil temperature sensor connector (A), and then remove the oil pressure & oil temperature sensor (B).

Tightening Torque :

14.7 - 21.6 N.m (1.5 - 2.2 kgf.m, 10.8 - 15.9 lb-ft)

Installation

•	Install the component to the specified torques.

•	Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

•	Apply the sealant to the sensor.

•	Insert the sensor in the installation hole and be careful not to damage it during installation.

1.	Install in the reverse order of removal.

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Tire Rotation

To equalize tread wear, HYUNDAI recommends that the tires be rotated according to the maintenance schedule or sooner if irregular wear develops.

During rotation, check the tires for correct balance.

When rotating tires, check for uneven wear and damage. Abnormal wear is usually caused by incorrect tire pressure, improper wheel alignment, out-ofbalance wheels, severe braking or severe cornering. Look for bumps or bulges in the tread or side of the tire. Replace the tire if you find any of these conditions. Replace the tire if fabric or cord is visible. After rotation, be sure to bring the front and rear tire pressures to specification and check lug nut tightness (proper torque is 79~94 lbf·ft [11~13 kgf·m]).