Kia Rio: Engine Control System / Intake Air Temperature Sensor (IATS)

Kia Rio 2017-2021 YB Service Manual / Engine Control / Fuel System / Engine Control System / Intake Air Temperature Sensor (IATS)

Specifications
Specification

Intake Air Temperature Sensor (IATS)

▷ Type: Thermistor type

Temperature
Resistance (kΩ)
°C
°F
-40
-40
40.93 - 48.35
-30
-22
23.43 - 27.34
-20
-4
13.89 - 16.03
-10
14
8.5 - 9.7
0
32
5.38 - 6.09
10
50
3.48 - 3.90
20
68
2.31 - 2.57
30
86
1.9 - 2.1
40
104
1.08 - 1.21
50
122
0.76 - 0.85
60
140
0.54 - 0.62
70
158
0.40 - 0.45
80
176
0.29 - 0.34
90
194
0.22 - 0.26
100
212
0.17 - 0.20
110
230
0.13 - 0.15
120
248
0.10 - 0.12
130
266
0.08 - 0.09

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.

Schematic diagrams
Circuit Diagram

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.

Temperature
Resistance (kΩ)
°C
°F
-40
-40
40.93 ~ 48.35
-30
-22
23.43 ~ 27.34
-20
-4
13.89 ~ 16.03
-10
14
8.5 ~ 9.7
0
32
5.38 ~ 6.09
10
50
3.48 ~ 3.90
20
68
2.31 ~ 2.57
30
86
1.9 ~ 2.1
40
104
1.08 ~ 1.21
50
122
0.76 ~ 0.85
60
140
0.54 ~ 0.62
70
158
0.40 ~ 0.45
80
176
0.29 ~ 0.34
90
194
0.22 ~ 0.26
100
212
0.17 ~ 0.20
110
230
0.13 ~ 0.15
120
248
0.10 ~ 0.12
130
266
0.08 ~ 0.09

Removal
1.

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

2.

Disconnect the manifold absolute pressure sensor connector (A).

3.

Remove the installation screw (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.

Installation is reverse of removal.

Troubleshooting
Waveform

Manifold Absolute Pressure Sensor (MAPS)
Specifications Specification Manifold Absolute Pressure Sensor (MAPS) ▷ Type: Piezo-resistive pressure sensor type Pressure [kPa (kgf/cm², psi)] Outp ...

Engine Coolant Temperature Sensor (ECTS)
Specifications Specification Engine Coolant Temperature Sensor (ECTS) ▷ Type: Thermistor type Temperature Resistance (kΩ) °C ...

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