Aerio & Esteem
WARNING: This page is about a different car, the 2002 Suzuki XL-7, 2002 Suzuki Vitara, 2002 Suzuki Grand Vitara, 2002 Suzuki Esteem, and 2002 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
Measure resistance between IAT sensor terminals while it is immersed in a container of water. Heat water slowly and ensure resistance changes as specified. See IAT SENSOR RESISTANCE SPECIFICATIONS table. See Fig 1 . If resistance is not as specified, replace IAT sensor.