Intake Air Temperature (IAT) Sensor Inspection

Reference: INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL AND INSTALLATION 

Immerse temperature sensing part of IAT sensor in water (or ice) and measure resistance between sensor terminals while heating water gradually.

If measured resistance doesn't show such characteristic as shown in the figure, replace IAT sensor.

Fig 1: Identifying Resistance Between Intake Air Temperature Sensor Terminals

Courtesy of SUZUKI OF AMERICA CORP.