Kia Optima: 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 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.
Intake Air Temperature Sensor (IATS). Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the IATS connector.
3.
Measure resistance between the IATS terminals 3 and
4.
...
Engine Coolant Temperature Sensor (ECTS). Specifications
Specification
Temperature
Resistance (kΩ)
°C
°F
-40
-40
48.14
-20
-4
...
See also:
Condition and operation in the front passenger occupant detection system
*1) The system judges a person of adult size as an adult. When a smaller adult
sits in the front passenger seat, the system may recognize him/her as a child depending
on his/her physique and pos ...
Compressor Oil. Repair procedures
Oil Specification
1.
The HFC-134a system requires
synthetic (PAG) compressor oil whereas the R-12 system requires mineral
compressor oil. The two oils must never be mixed.
...
Engine Cooling System
The high-pressure cooling system has a reservoir filled with year-round antifreeze
coolant. The reservoir is filled at the factory.
Check the antifreeze protection and coolant level at least once a ...