IAT

Scan tool displays -40°C + 151°C (-40°F - +304°F). The PCM converts the resistance of the intake air temperature sensor to degrees. The PCM uses Intake Air Temperature (IAT) in order to adjust the fuel delivery and the spark timing according to the incoming air density. IAT is also compared to ECT at start-up in order to identify cold starts for the HO2S heater and the [1][2]EVAP diagnostics.