Engine Coolant Temperature Sensor
WARNING: This page is about a different car, the 2003 Suzuki XL-7, 2003 Suzuki Vitara, 2003 Suzuki Grand Vitara, and 2003 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
Remove Engine Coolant Temperature (ECT) sensor from intake manifold and place in water with a thermometer. Heat water to specified temperature and check resistance. See Fig 1 . Replace sensor if resistance is not within specification.