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

Kia Rio 2017-2020 YB Service Manual / Engine Control / Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Specifications
Specification

Engine Coolant Temperature Sensor (ECTS)

▷ Type: Thermistor type

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
100
212
0.19
110
230
0.145 ~ 0.149
120
248
0.12

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 whose resistance changes 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

Repair procedures
Inspection
1.

Turn ignition switch OFF.

2.

Disconnect ECTS connector.

3.

Remove the ECTS.

4.

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

5.

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
100
212
0.19
110
230
0.145 ~ 0.149
120
248
0.12

Removal
1.

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

2.

Disconnect the engine coolant temperature sensor connector (A).

3.

Remove the fixing clip (B), and then pull the sensor from the water temperature control assembly.

  

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

4.

Replenish the engine coolant.

(Refer to Engine Mechanical System - "Coolant")

Installation
  

Install the component with the specified torques.

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

Apply the engine coolant to the O-ring.

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

1.

Installation is reverse of removal.

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