Water Temperature Sensor Inspection
WARNING: This page is about a different car, the 2004 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
Warm up water temperature sensor. Then make sure that its resistance is decreased as its temperature increases. If check result is not satisfactory, replace water temperature sensor with new one.
Water temperature sensor resistance
Approximately 315 ohms at 80 °C (176 °F)