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 Ω at 50°C (122°F) 

16.4 - 19.4 Ω at 120°C (248°F) 

Fig 1: Identifying Engine Coolant Temperature Sensor & Gauge

Courtesy of SUZUKI OF AMERICA CORP.