Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

INTAKE AIR TEMPERATURE SENSOR (IAT SENSOR)

The intake air temperature sensor (IAT Sensor), located on the intake manifold, is a resistor-based sensor for detecting the intake air temperature. According to the intake air temperature information from the sensor, the ECM provides necessary fuel injection amount control.

Circuit Diagram:

Troubleshooting Procedures:

TROUBLESHOOTING HINTS
The MIL is ON or the DTC is displayed on the HI-SCAN under the following condition;
1. When the intake air temperature is detected as below -40°C or higher than 120°C.
2. Input from intake air temperature sensor is below 0.1 V or above 4.8 V when engine is in a full warm-up condition.

Using Voltmeter:

SENSOR INSPECTION
1. Use the multimeter, measure the sensor resistance.




2. Measure the resistance between the IAT sensor terminal 1 and 2.

3. If the resistance deviates from the standard value, replace the intake air temperature sensor assembly.

Harness Inspection Procedure: