Hyundai Elantra: Engine Control System / Intake Air Temperature Sensor (IATS)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Intake Air Temperature Sensor (IATS)

Description and operation

Description

Intake Air Temperature Sensor (IATS) is included inside Manifold Absolute Pressure Sensor and detects the intake air temperature.

To calculate precise air quantity, correction of the air temperature is needed because air density varies according to the temperature. So the ECM uses not only MAPS signal but also IATS signal. This sensor has a Negative Temperature Coefficient (NTC) and its resistance is in inverse proportion to the temperature.

Specifications

Specification

Temperature [°C (°F)]	Resistance (kΩ)
-40 (-40) ± 1	38.88 - 50.78
-20 (-4) ± 1	13.20 - 16.84
0 (32) ± 1	5.12 - 6.13
20 (68) ± 1	2.20 - 2.70
25 (77) ± 1	1.81 - 2.22
40 (104) ± 1	1.02 - 1.28
60 (140) ± 1	0.52 - 0.66
80 (176) ± 1	0.28 - 0.36
100 (212) ± 1	0.16 - 0.22
120 (248) ± 1	0.10 - 0.14
130 (266) ± 1	0.08 - 0.11
150 (302) ± 1	0.05 - 0.08

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Turn ignition switch OFF.

2.	Disconnect IATS connector.

3.	Measure resistance between IATS terminals 1 and 2.

Check that the resistance is within the specification.

Specification : Refer to "Specification"

Removal

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

2.	Disconnect the manifold absolute pressure sensor connector (A).

Remove the manifold absolute pressure sensor (B) after loosening the bolt.

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. In this case, use it after inspecting.

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

1.	Install in the reverse order of removal.

Manifold Absolute Pressure Sensor (MAPS)

Description and operation DescriptionManifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is installed on the surge tank. It senses absolute pressure of the surge tank and transfers the analog signal proportional to the pressure to the ECM...

Engine Coolant Temperature Sensor (ECTS)

Description and operation DescriptionThe Engine Coolant Temperature Sensor (ECTS) is located in the cylinder block and cylinder head, and measures the temperature of the engine coolant...

Other information:

Hyundai Elantra (CN7) 2021-2025 Owner's Manual: Function operation

Operating conditions Smart Cruise Control will operate when the following conditions are satisfied. Basic function The gear is in D (Drive) The driver’s door is closed EPB (Electronic Parking Brake) is not applied Your vehicle speed is within the operating speed range -- 5~110 mph (10~180 km/h): when there is no vehicle in front -- 0~110 mph (0~180 km/h): when there is a vehicl..

Hyundai Elantra (CN7) 2021-2025 Owner's Manual: How vehicle radio works

FM reception AM and FM radio signals are broadcast from transmitter towers located around your city. They are intercepted by the radio antenna on your vehicle. This signal is then received by the radio and sent to your vehicle speakers. When a strong radio signal has reached your vehicle, the precise engineering of your audio system ensures the best possible quality reproduction. However,..

Rear center seat belt

When using the rear center seat belt, the buckle with the “CENTER” mark must be used.

WARNING

Make sure that the seatback is locked in place when using the rear center seat belt.

If not, the seatback may move when there is a sudden stop or collision, which could result in serious injury.