ECT Sensor Inspection

Reference: ECT SENSOR REMOVAL AND INSTALLATION 

Check ECT sensor resistance as follows.

• Check resistance between terminals "1" and "2". Make sure its resistance decreases as its temperature increases.

  If measured resistance is out of specification, replace ECT sensor (1).

  Fig 1: Checking Resistance Between ECT Sensor Terminals 1 And 2

  Courtesy of SUZUKI OF AMERICA CORP.

  ECT sensor resistance 

  -20°C (-4°F): 13.51 - 16.17 kΩ 

  20°C (68°F): 2.290 - 2.620 kΩ 

  80°C (176°F): 0.309 - 0.331 kΩ 

  Fig 2: ECT Sensor Resistance Graph

  Courtesy of SUZUKI OF AMERICA CORP.