Hyundai Accent (HC): Engine Control System / Engine Coolant Temperature Sensor (ECTS)

Hyundai Accent (HC) (2017 - 2022) Service Manual / Engine Control / Fuel System / Engine Control System / Engine Coolant Temperature Sensor (ECTS)

- 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.

- Specification
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 ~ 6.29
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

- Circuit Diagram [M/T]

Harness Connector

[A/T]

Harness Connector

- Inspection

1.Turn ignition switch OFF.

2.Disconnect ECTS connector.

3.Remove the ECTS.

4.After immersing the thermistor of the sensor into engine coolant, measure resistance between ECTS terminals 1 and 2.

5.Check that the resistance is within the specification.

Specification : Refer to "Specification"

- Removal ECTS #1

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.Remove the installation bolt, and then remove the sensor (B) from the cylinder block.

Engine coolant temperature sensor installation :9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

ECTS #2

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

2.Remove the alternator.(Refer to Engine Electrical System - "Alternator")

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

4.Remove the installation bolt, and then remove the sensor (B) from the cylinder block.

Engine coolant temperature sensor installation :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.

   

• Insert the sensor in the installation hole and be careful not to damage.

1.Install in the reverse order of removal.

ETC (Electronic Throttle control) System

Heated Oxygen Sensor (HO2S)

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Engine Control Module (ECM)

- ECM Terminal and Input/Output signal [M/T] ECM Terminal Function (M/T) Connector [A] Pin NoDescription 1- 2- 3Injector (Cylinder #1-1) [Low] control output 4Injector (Cylinder #1-2) [Low] control output 5- 6- 7- 8- 9- 10- 11Electric EGR Control Valve gorund 12Engine Coolant Temperature Sensor (ECTS) #2 ground 13Ignition Coil (Cylinder #1) control output 14- 15Ignition Coil (Cylinder #4) control output 16Thermal Management Module (TMM) Motor ground 17- 18Engine Cool

Hyundai Accent (HC) (2017 - 2022) Service Manual: Troubleshooting

- Troubleshooting SymptomPossible CauseRemedy One lamp does not light(all exterior)Bulb burned outReplace bulb Socket, wiring or ground faultyRepair if necessary Head lamps do not lightBulb burned outReplace bulb Ignition fuse (LOW:10A, HIGH:20A) blownCheck for short and replace fuse Head lamp fuse (15A) blownCheck for short and replace fuse Head lamp relay faultyCheck relay Lighting switch faultyCheck switch Wiring or ground faultyRepair if necessary Tail lamps and license plate lamp

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