Engine Coolant Temperature (ECT) Sensor Inspection

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

ECT sensor resistance 

-20 °C (-4 °F): 14.1 - 16.8 kΩ 

20 °C (68 °F): 2.35 - 2.65 kΩ 

80 °C (176 °F): 0.313 - 0.332 kΩ 

Fig 1: Checking ECT Sensor For Resistance

Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: ECT Sensor Graph

Courtesy of SUZUKI OF AMERICA CORP.