Kia Forte: Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Kia Forte 2019-2020 (BD) Service Manual / Engine Control / Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Specifications
Specification

Temperature
Resistance (kΩ)
°C
°F
-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

Description and operation
Description

Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature. The ECTS uses a thermistor that changes resistance with 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.

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

Schematic diagrams
Circuit Diagram

Harness Connector

Repair procedures
Inspection
1.

Turn the ignition switch OFF.

2.

Remove the ECTS (Refer to "Removal").

3.

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

4.

Check that the resistance is within the specification.

Temperature
Resistance (kΩ)
°C
°F
-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 & Installation
1.

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

2.

Remove the air cleaner assembly and air intake hose.

(Refer to Engine Mechanical System - “Air Cleaner”)

3.

Remove the battery.

(Refer to Engine Electrical System - "Battery")

4.

Disconnect the engine coolant temperature sensor connector (A).

5.

Remove the engine coolant temperature sensor (B).

Engine Coolant Temperature Sensor :

29.4 - 39.2 N·m (3.0 - 4.0 kgf·m, 21.7 - 28.9 lb·ft)

  

Note that engine coolant may be flowed out from the water temperature control assembly when removing the sensor.

6.

Install in the reverse order of removal.

7.

Fill with engine coolant.

(Refer to Engine Mechanical System - "Coolant")

  

Install the component with the specified torques.

Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

Apply the engine coolant to the O-ring.

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

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