Hyundai Santa Cruz (NX4A OB) 2021-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Hyundai Santa Cruz: Engine Control System / Engine Coolant Temperature Sensor (ECTS)

- Description Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature.The electrical resistance of the ECTS decreases as the temperature increases, and increases as the temperature decreases. The reference 5V is supplied to the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the ECTS are connected in series. When the resistance value of the thermistor in the ECTS changes according to the engine coolant temperature, the output voltage also changes.ion duration and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve drivability.During cold engine operation, the ECM increases the fuel injection duration and controls the ignition timing using the information of engine coolant temperature to avoid engine stalling and improve drivability.

- Specification ▷ Type : Thermistor type

Temperature (°C, °F)	Resistance (kΩ)
-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 - 6.30
10 (50)	3.42 - 4.01
20 (68)	2.31 - 2.59
30 (86)	1.55 - 1.76
40 (104)	1.08 - 1.20
50 (122)	0.77 - 0.85
60 (140)	0.56 - 0.61
70 (158)	0.42 - 0.45
80 (176)	0.31 - 0.33
90 (194)	0.24 - 0.25
100 (212)	0.184 - 0.192
110 (230)	0.145 - 0.149
120 (248)	0.114 - 0.119
130 (266)	0.091 - 0.095
140 (284)	0.073 - 0.077
150 (302)	0.059 - 0.063

- Circuit Diagram Engine Coolant Temperature Sensor (ECTS) #1 - Water Temperature Control Assembly side

Harness Connector

Engine Coolant Temperature Sensor (ECTS) #2 - Electronic Water Pump (EWP) Side

Harness Connector

Engine Coolant Temperature Sensor (ECTS) #3 - Cylinder Block Side

Harness Connector

- 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 signal terminals and ground terminals.

4. Check that the resistance is within the specification.

Specification : Refer to "Inspection"

- Removal Engine Coolant Temperature Sensor (ECTS) #1 - Water Temperature Control Assembly side

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

2. Remove the air cleaner assembly.(Refer to Engine Mechanical System - "Air Cleaner")

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

4. Disconnect the fixing clip (A), and remove the engine coolant temperature sensor (B).

Engine Coolant Temperature Sensor (ECTS) #2 - Electronic Water Pump (EWP) Side

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

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

3. After removing the installation bolts (B), remove the engine coolant temperature sensor.

Tightening torque :9.8 - 11.7 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.6 lb-ft)

Engine Coolant Temperature Sensor (ECTS) #3 - Cylinder Block Side

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

2.Remove the intake manifold.(Refer to Engine Mechanical System - "Intake Manifold)

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

4. After removing the installation bolts (B), remove the engine coolant temperature sensor.

Tightening torque :9.8 - 11.7 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.6 lb-ft)

- Installation

• Install the component to the specified torques.

• Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

• Replenish the engine coolant.

1. Install in the reverse order of removal.

2.Supply the Engine Coolant.(Refer to Engine Mechanical System - "Coolant System")

Ambient Temperature Sensor (ATS)

- Description Installed on the front-end module, the Ambient Temperature Sensor (ATS) senses the ambient temperature. ECM receives the intake air temperature and ambient air temperature at the ...

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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 engi ...

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