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

INTAKE AIR TEMPERATURE SENSOR (IAT SENSOR)





The intake air temperature sensor (IAT Sensor), built-in type in the MAP sensor, is a resistor-based sensor which detects the intake air temperature. According to the intake air temperature reading, the ECM will control the necessary amount of fuel injection.

Circuit Diagram:

TROUBLESHOOTING HINTS
The MIL is ON or the DTC is displayed on the HI-SCAN under the following condition;
- When the intake air temperature is detected below -40 °C or higher than 120 °C.

Harness Inspection Procedure:

SENSOR INSPECTION




1. Using a multimeter, measure the IAT sensor resistance between terminals 3 and 4.
2. If the resistance deviates from the standard value, replace the intake air temperature sensor assembly.