Kia Sportage: Engine Control System / Engine Coolant Temperature Sensor (ECTS) Description and operation

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.

Engine Coolant Temperature Sensor (ECTS) Specifications

Specification Temperature Resistance (kΩ) °C °F -40 -40 48.14 -20 ...

Engine Coolant Temperature Sensor (ECTS) Schematic diagrams

Circuit Diagram Harness Connector ...

Other information:

Kia Sportage QL (2015-2025) Service Manual: Ignition Coil Specifications

Specification Ignition Coil Item Specification Coil Input Voltage (V) 13.5 Item Specification Engine Time (RPM) 1000 2000 3000 ...

Kia Sportage QL (2015-2025) Service Manual: Thermostat Repair procedures

Removal and Installation    Removal of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat. ...