Hyundai Ioniq: Engine Control System / Engine Coolant Temperature Sensor (ECTS). Repair procedures
1. | Turn the ignition switch OFF. |
2. | Remove the ECTS. (Refer to "Removal") |
3. | After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 1 and 3. |
4. | Check that the resistance is within the specification. Specification : Refer to "Specification" |
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Engine Coolant Temperature Sensor (ECTS) [Water Temperature Control Assembly]
1. | Turn ignition switch OFF and disconnect the negative (-) battery cable. |
2. | Remove the air cleaner assembly (Refer to Engine Mechanical System - "Air Cleaner") |
3. | Remove the purge control solenoid valve. (Refer to Engine Control System - "Purge Control Solenoid Valve (PCSV)") |
4. | Disconnect the engine coolant temperature sensor connector (A). |
5. | Remove the engine coolant temperature sensor after removing the fixing pin (B). 
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| Note that engine coolant may flow out from the water temperature control assembly when removing the sensor. |
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6. | Fill with engine coolant. (Refer to Engine Mechanical System - "Coolant") |
Engine Coolant Temperature Sensor (ECTS) [EGR Cooler Tube]
1. | Turn ignition switch OFF and disconnect the negative (-) battery cable. |
2. | Remove the air cleaner assembly (Refer to Engine Mechanical System - "Air Cleaner") |
3. | Disconnect the engine coolant temperature sensor connector (A). |
4. | Remove the engine coolant temperature sensor after removing the fixing pin (B). 
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| Note that engine coolant may flow out from the EGR cooler tube when removing the sensor. |
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5. | Fill with engine coolant. (Refer to Engine Mechanical System - "Coolant") |
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| Install the component with the specified torques. |
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| Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing. |
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| Apply the engine coolant to the O-ring. |
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| Insert the sensor in the installation hole and be careful not to damage. |
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1. | Install in the reverse order of removal. Engine coolant temperature sensor installation : 29.4 - 39.2 N.m (3.0 - 4.0 kgf.m, 21.7 - 28.9 lb-ft) |
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