Intake Air Temperature Sensor (IATS)

Description and Operation

Description

Built into the manifold absolute pressure sensor, intake air temperature sensor. The sensor (IATS) detects the intake air temperature. For accurate air quantity calculation, air temperature correction is required because air density depends on temperature. Therefore, the ECM uses both the MAPS signal and the IATS signal. This sensor is a negative temperature coefficient (NTC) thermistor with resistance inversely proportional to temperature.

Specifications

Specification

Temperature		Resistance (kOhm)
°C	°F
-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
60	140	0,54 - 0,66
80	176	0,29 - 0,34

Circuit Diagrams

Wiring Diagram

Harness Connector

Repair Procedures

Inspection

1. 1
   Turn the ignition off.
2. 2
   Disconnect the IAT sensor connector.
3. 3
   Measure the resistance between terminals 3 and 4 of the IAT sensor.
4. 4
   Make sure the resistance is within specification.

   Temperature		Resistance (kOhm)
   °C	°F
   -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
   60	140	0,54 - 0,66
   80	176	0,29 - 0,34

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
2. 2
   Disconnect the vacuum hose (A).
3. 3
   Disconnect the intake air temperature sensor connector (B).
4. 4
   Remove the sensor by loosening the mounting bolt. Intake Air Temperature Sensor (IATS) Mounting Bolt: 9.8–11.8 N·m

   

Installation

Install the component to the specified torque. Be aware that internal damage may occur if the component is dropped. In this case, inspect the component before installation. Insert the sensor into the mounting hole, taking care not to damage it during installation.

1. Install in the reverse order of removal.