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

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.

Specifications

Specification
Temperature [°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
(M/T)

(A/T)

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 3.
5.
Check that the resistance is within the specification.
Specification : Refer to "Specification"
Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Disconnect the engine coolant temperature sensor connector (A).
3.
Removal the water temperature control assembly (B).

Installation
1.
Install in the reverse order of removal.
Engine coolant temperature sensor :
29.4 ~ 39.2 N.m (3.0 ~ 4.0 kgf.m, 21.7 ~ 28.9 lb-ft)
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Other information:

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