ECT (Engine Coolant Temperature) Sensor Inspection

Reference: ECT (ENGINE COOLANT TEMPERATURE) SENSOR REMOVAL AND INSTALLATION 

Check that resistance between terminals "1" and "2" varies depending on engine coolant temperature.

If faulty condition is found, replace ECT sensor (1).

Fig 1: Identifying ECT Sensor Connector Terminals

Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: ECT Sensor Resistance Graph

Courtesy of SUZUKI OF AMERICA CORP.