Air Temperature Sensor ( Ambient / Intake ): Description and Operation

The Intake Air Thermosensor, located in the intake air system dynamic chamber, detects intake air temperature.

The ECU uses this input in its calculations for fuel injection quantity and pressure regulator control.

Sensor resistance and the voltage signal to the ECU vary with intake air temperature. The input signal at 20°C (68°F) is approximately 2.5V.

Normal sensor resistance measurements are as follows:

K OHMS AIR TEMP.

29.7 - 36.3 25°C / 77°F
10.5 - 12.9 50°C / 122°F
3.3 - 3.7 85°C / 185°F