Hyundai Ioniq (AE): 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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Circuit Diagram[Water Temperature Control Assembly][EGR Cooler Tube]
Other information:
Component Location1. Heater unit assemblyCompoents1. Heater core cover2. Heater core & Seal assembly3. Mode actuator [LH]4. Temperature control actuator [LH]5. Shower duct [LH]6. Duct sensor [Floor]7. PTC Heater8. Duct sensor [Vent]9. Heater & Evaporator lower case10.
Inspection1.Connect the battery voltage and check the blower motor rotation.2.If the blower motor does not operate well, substitute with a known-good blower motor and check for proper operation.3.Replace the blower motor if it is proved that there is a problem with it.
