Hyundai Creta: 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)
40.93 ~ 48.35
-30 (-22)
23.43 ~ 27.34
-20 (-4)
13.89 ~ 16.03
-10 (14)
8.50 ~ 9.71
0 (32)
5.38 ~ 6.09
10 (50)
3.48 ~ 3.90
20 (68)
2.31 ~ 2.57
25 (77)
1.90 ~ 2.10
30 (86)
1.56 ~ 1.74
40 (104)
1.08 ~ 1.21
60 (140)
0.54 ~ 0.62
80 (176)
0.29 ~ 0.34

Troubleshooting

Waveform

Schematic diagrams

Circuit Diagram
(M/T)

(A/T)

Repair procedures

Inspection
1.
Turn ignition switch OFF.
2.
Disconnect IATS connector.
3.
Measure resistance between IATS terminals 3 and 4.
4.
Check that the resistance is within the specification.
Specification : Refer to "Specification"
Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Remove the resonator and the air intake hose.
(Refer to Engine Mechanical System - "ETC (Electronic Throttle control) System")
3.
Remove the ETC module.
(Refer to Engine Control System - "ETC")
4.
Disconnect the manifold absolute pressure sensor connector (A).
5.
Remove the mounting bolt (B), and then remove the sensor from the surge tank.

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.
Intake air temperature sensor mounting bolt :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
Manifold Absolute Pressure Sensor (MAPS)
Description and operation Description Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is installed on the surge tank. It senses absolute pressure of the ...

Engine Coolant Temperature Sensor (ECTS)
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