Hyundai Sonata: 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 3 and 4. |
| 4. |
Check that the resistance is within the specification.
Specification: Refer to “Specification”
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| 1. |
Turn the ignition switch OFF and disconnect the battery negative (-) terminal. |
| 2. |
Remove the air cleaner assembly and air intake hose.
(Refer to Engine Mechanical System - “Air Cleaner”) |
| 3. |
Remove the engine wiring.
| (1) |
Disconnect the OCV and WGV extension (A). 
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| (2) |
Disconnect the ignition coil (A). |
| (3) |
Disconnect the CMPS (B). |
| (4) |
Disconnect the FPCV (C). |
| (5) |
Disconnect the PCSV (D). |
| (6) |
Remove the enigne wiring mounting bolts (E) and then remove the engine wiring harness (F). 
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| 4. |
Remove the vacuum pipe mounting bolts (A) and make a gap by moving the bracket. |
| 5. |
Disconnect the engine coolant temperature sensor connector (B). |
| 6. |
Remove the engine coolant temperature sensor (C). 
| • |
Note that engine coolant may be flowed out from the water temperature control assembly when removing the sensor. |
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| 7. |
Fill with engine coolant.
(Refer to Engine Mechanical System - "Coolant")
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| • |
Install the component with the specified torques. |
| • |
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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Description
Crankshaft Position Sensor (CKPS) detects the crankshaft
position and is one of the most important sensors of the engine control
system. If there is no CKPS signal input, the engine ...
Engine Coolant Temperature Sensor (ECTS) Schematic Diagrams
Crankshaft Position Sensor (CKPS) Description and Operation