The intake air temperature sensor is built-into mass air flow sensor (1). The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.
<Reference data>

Intake air temperature [°C (°F)] | Voltage*　(V) | Resistance　(kΩ)
25 (77) | 3.3 | 1.800 - 2.200
80 (176) | 1.2 | 0.283 - 0.359
*: These data are reference values and are measured between ECM terminals 44 (Intake air temperature sensor) and 22 (Sensor ground).