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

- 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.

1.In the engine control system, failure can be quickly diagnosed by using the diagnosis tool.

(1)Self diagnosis : Checking failure and code number (DTC).

(2)Current data : Checking the system input/output data state.

(3)Actuation test : Checking the system operation condition.

(4)Additional function : Controlling other features including system option setting and zero point adjustment.

1.Check the continuity between the terminal and the body using an ohmmeter. If the continuity fails, replace the switch.

2.Press the inside of the oil hole with a slender rod etc. and check the continuity between the terminal and the body. Change the switch if it is energized while being pressed.

3.If the pressure (0.5kg/cm2) is not energized when applied through the oil hole, the switch is functioning normally. Check for air leaks, and if there is any leakage, replace the switch as the diaphragm is damaged.

• Be careful not to damage the parts located under the vehicle (floor under cover, canister, fuel tank) when raising the vehicle using the lift.(Refer to General Information - "Lift and Support Points")

1.Disconnect the battery negative (-) terminal.

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

3.Drain the enigne oil.(Refer to Engine Mechanical System - "Engine Oil")

4.Remove the intake manifold.(Refer to Engine Mechanical System - "Intake Manifold")

5.Disconnect the connector (A) and then remove the sensor (B).

Tightening torque :35.3 - 38.2 N.m (3.6 - 3.9 kgf.m, 26.0 - 28.2 lb-ft)

1.Install in the reverse order of removal.

• Apply the sealant to the sensor.

Specification : TB2403Tickness : 0.2 - 0.4 mm (0.0079 - 0.0157 in.)