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

Kia Rio 2017-2023 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	Resistance (kΩ)
-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.

Check that the resistance is within the specification.

Temperature		Resistance (kΩ)
°C	°F	Resistance (kΩ)
-40	-40	40.93 ~ 48.35
-30	-22	23.43 ~ 27.34
-20	-4	13.89 ~ 16.03
-10	14	8.5 ~ 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)] Output Voltage (V) [Vref = 5V] 20.

Engine Coolant Temperature Sensor (ECTS)❯

Specifications Specification Engine Coolant Temperature Sensor (ECTS) ▷ Type: Thermistor type Temperature Resistance (kΩ) °C °F -40 -40 48.

Other information:

Kia Rio 2017-2023 YB Service Manual: Ignition Switch

Repair procedures Inspection 1. Disconnect the key warning switch connector (A) and ignition switch connector (B) from the steering column. 2. Check for continuity between the terminals.

Kia Rio 2017-2023 YB Service Manual: A/C Pressure Transducer

Description and operation Description The A/C Pressure Transducer (APT) convert the pressure value of high pressure line into voltage value after measure it. By converted voltage value, engine ECU controls cooling fan by operating it high speed or low speed.