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

Kia Forte 2019-2025 (BD) Service Manual / Engine Control / Fuel System / Engine Control System / Intake Air Temperature Sensor (IATS)

Specifications

Specification

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	40.93 - 48.35
-20	-4	13.89 - 16.03
0	32	5.38 - 6.09
10	50	3.48 - 3.90
20	68	2.31 - 2.57
40	104	1.08 - 1.21
50	122	0.76 - 0.85
60	140	0.54 - 0.62
80	176	0.29 - 0.34

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) Thermister and it's resistance changes in reverse proportion to the temperature.

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the IATS connector.

3.	Measure resistance between the IATS terminals 3 and 4.

Check that the resistance is within the specification.

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	40.93 - 48.35
-20	-4	13.89 - 16.03
0	32	5.38 - 6.09
10	50	3.48 - 3.90
20	68	2.31 - 2.57
40	104	1.08 - 1.21
50	122	0.76 - 0.85
60	140	0.54 - 0.62
80	176	0.29 - 0.34

Removal & Installation

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

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

Remove the sensor (B) from the Intake manifold by loosening the mounting bolts.

Intake air temperature sensor mounting bolt:

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

Install in the reverse order of removal.

•	Tighten the component with the specified torques.

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

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

Manifold Absolute Pressure Sensor (MAPS)

Specifications Specification Pressure [kPa (kgf/cm², psi)] Output Voltage (V) 32.5 (0.33, 4.71) 0.5 284 (2.9 ...

Ambient Temperature Sensor (ATS)

Specifications Specification Temperature[⁰C(⁰F)] Resistance(kΩ) -40(-40) 811.1 - 956.8 -20(-4) ...

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