Hyundai Palisade: Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Hyundai Palisade (LX2) 2020-2025 Service Manual / Engine Control/Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Description and operation

Description

Located in the engine coolant passage of the cylinder head, Engine Coolant Temperature Sensor (ECTS) detects the engine coolant temperature. The ECTS uses a thermistor with resistance in proportion to the temperature.

The electrical resistance of the ECTS decreases as the temperature increases, and increases as the temperature decreases. The reference +5V is supplied to the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance value of the thermistor in the ECTS changes according to the engine coolant temperature, the output voltage also changes.ion duration and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve drivability.

During cold engine operation, the ECM increases the frequency of fuel injection and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve drivability.

Hyundai Palisade. Description and operation

Specifications

Specification

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	48.14
-20	-4	14.13 - 16.83
0	32	5.79
20	68	2.31 - 2.59
40	104	1.15
60	140	0.59
80	176	0.32

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 ECTS connector.

3.	Remove the ECTS. (Refer to "Removal")

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

Check that the resistance is within the specification.

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	48.14
-20	-4	14.13 - 16.83
0	32	5.79
20	68	2.31 - 2.59
40	104	1.15
60	140	0.59
80	176	0.32

Removal

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.	Disconnect the engine coolant temperature sensor connector (A).

Remove the water temperature sensor (B) from the water temperature control assembly.

•	Note that engine coolant may leak out of the water temperature control assembly when removing the sensor.

Hyundai Palisade. Repair procedures

Installation

•	Install the component to the specified torque.

•	Note that internal damage may occur if the component is dropped. In this case, inspect the component before installation.

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

1.	Install in the reverse order of removal.

2.	Replenish the engine coolant. (Refer to Engine Mechanical System - "Coolant System")

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