Kia Optima Hybrid: Engine Control System / Engine Coolant Temperature Sensor (ECTS) Repair procedures

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Engine Control/Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS) Repair procedures

Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the ECTS connector.

3.	Remove the ECTS.

4.	After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.

Check that the resistance is within the specification.

Temperature		Resistance (k?)
°C	°F	Resistance (k?)
-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

Removal

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

2.	Disconnect the engine coolant temperature sensor connector (A).

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

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

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.	Install in the reverse order of removal.

Engine Coolant Temperature Sensor (ECTS) Schematic Diagrams

Circuit Diagram ...

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