Engine Coolant Temperature Sensor: Inspection

Check that the engine coolant temperature sensor has no deformation, cracks or other damages.
Immerse the engine coolant temperature sensor and a thermometer in water.
CAUTION: Take care not to allow water to get into the engine coolant temperature sensor connector. Completely remove any water inside.

Fig 1: Checking Engine Coolant Temperature Sensor
Courtesy of SUBARU OF AMERICA, INC.

Raise water temperature gradually, measure the resistance between the engine coolant temperature sensor terminals when the temperature is 20°C (68°F) and 80°C (176°F).

NOTE: Agitate the water for even temperature distribution.

Fig 2: Measuring Resistance Between Engine Coolant Temperature Sensor Terminals

Courtesy of SUBARU OF AMERICA, INC.

Water temperature	Terminal No.	Standard
20°C (68°F)	1 and 2	Approx. 2.45+0.14 -0.13 kΩ
80°C (176°F)	1 and 2	Approx. 0.318±0.008 kΩ