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

AIR TEMPERATURE SENSOR
The intake air temperature sensor (IAT Sensor) located in the intake air hose, 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 Hi-Scan:

Harness Inspection Procedures:

SENSOR INSPECTION
1. Use the multimeter, measure the sensor voltage.
2. Measure the voltage between the IAT sensor terminal 1 and 2
3. If the voltage deviates from the standard value, replace the intake air temperature sensor assembly.