Intake Air Temperature Sensor

Mass Airflow Sensor and Intake Air Temperature Sensor
The MAF sensor is a combined MAF sensor and IAT sensor.

Intake Air Temperature Sensor Description
The IAT sensor is a temperature dependent resistor (thermistor), i.e. the resistance of the sensor varies with temperature. The thermistor is an NTC type element, which means that the sensor resistance decreases as the sensor temperature increases. The sensor forms part of a voltage divider chain with an additional resistor in the ECM. The voltage from this network changes as the sensor resistance changes, relating the IAT to the voltage measured by the ECM.

A fault is detected if the resistance of the sensor exceeds a minimum or maximum threshold.