Engine Coolant Temperature (ECT) Sensor Inspection

Warm up sender gauge (2). Thus make sure its resistance is decreased with increase of its temperature.

ECT sender gauge specifications 

136 - 216 ohms at 50°C (122°F)

16.4 - 19.4 ohms at 120°C (248°F)

Fig 1: Checking Engine Coolant Temperature (ECT) Sensor

Courtesy of SUZUKI OF AMERICA CORP.