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

INTAKE AIR TEMPERATURE (IAT) SENSOR




The intake air temperature sensor(IAT Sensor), located on the air cleaner, 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





HARNESS INSPECTION PROCEDURES





SENSOR INSPECTION
1. Using the voltmeter, 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.


TROUBLESHOOTING PROCEDURES




MALFUNCTION SYMPTOM
Input from intake air temperature sensor is below 0.1 V or above 4.8 V when engine is full warm-up condition.