Hyundai i-30: Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Control / Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Description and operation
Description
The Engine Coolant Temperature Sensor (ECTS) is located in the cylinder block and cylinder head, and measures the temperature of the engine coolant.
The thermistor of the cooling water temperature and resistance has a negative temperature coefficient (NTC) where the resistance decreases when the temperature rises and the resistance increases when the temperature decreases.
The ECTS # 1 mounted on the cylinder head measures the coolant temperature from the engine, and the ECTS # 2 mounted on the cylinder block measures the coolant temperature entering the engine. The ECTS # 1 and the ECTS # 2 deliver the cooling water temperature to the ECM (Engine Control Module), which delivers the signal to the Thermal Management Module valve (TMM).
The TMM that receives the signal controls the flow of coolant to adjust the coolant temperature. In addition, the ECTS calibrates the fuel injection quantity and the ignition timing based on the information of the cooling water temperature to prevent the engine failure and an engine-hunting during a cold start test.

Specifications
Specification
Temperature
Resistance (kΩ)
°C
°F
-40
-40
41.74 - 54.54
-30
-22
23.54 - 29.94
-20
-4
14.13 - 16.83
-10
14
8.39 - 10.22
0
32
5.28 - 6.29
10
50
3.42 - 4.00
20
68
2.31 - 2.59
30
86
1.55 - 1.86
40
104
1.08 - 1.21
50
122
0.77 - 0.85
60
140
0.56 - 0.61
70
158
0.41 - 0.44
80
176
0.31 - 0.33
90
194
0.23 - 0.25
100
212
0.18 - 0.19

Schematic diagrams
Circuit Diagram

Harness Connector

Repair procedures
Inspection
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"
Removal
[Engine Coolant Temperature Sensor (ECTS) #1]
1.
Turn the ignition switch OFF, and then disconnect the battery negative (-) terminal.
2.
Remove the delivery pipe.
(Refer to Fuel Delivery System - "Delivery Pipe")
3.
Remove the ECTS after loosening the mounting bolt (A).

[Engine Coolant Temperature Sensor (ECTS) #2]
1.
Turn the ignition switch OFF, and then disconnect the battery negative (-) terminal.
2.
Remove the alternator.
(Refer to Engine Electrical System - "Alternator")
3.
Disconnect the ECTS connector (A).
4.
Remove the ECTS after loosening the mounting bolt (B).
Tightening Torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

Installation
  
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.
  
Apply the engine coolant to the O-ring.
  
Insert the sensor in the installation hole and be careful not to damage.
1.
Install in the reverse order of removal.

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