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

INTAKE AIR TEMPERATURE (IAT) 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. The intake air temperature information from the sensor helps the PCM provide the necessary fuel injection quantity.

Circuit Diagram:

Troubleshooting Procedures:

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

Using Hi-Scan:

Harness Inspection Procedure <2.7 V6>:

SENSOR INSPECTION
1. Using a multimeter, measure the sensor voltage.




2. Measure the voltage between the IAT sensor terminal and 2.




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