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.

Specification
Temperature
Resistance (kΩ)
°C
°F
-40
-40
48.14
-20 ...
Circuit Diagram
Harness Connector
...
Other information:
This warning light illuminates:
Once you set the ignition switch or Engine Start/Stop Button to the ON
position.
- It remains on until the engine is started.
When there is a malfunction with either the alternator or electrical charging
system.
If there is a malfunction with either ...
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Remove the front / rear bumper cover.
(Refer to Body - "Front Bumper Cover")
(Refer to Body - "Rear Bumper Cover")
3.
...