Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

Engine Coolant Temperature Sensor Ohm Test:

1. Disconnect Engine Coolant Temperature Sensor harness connector.
2. Check resistance as shown in the figure.

Resistance Values:
2.1 - 2.9k Ohms at 20°C (68°F)
0.68 - 1.0k Ohms at 50°C (122°F)
0.30 - 0.33k Ohms at 80°C (176°F)

If Not Good, replace Engine Coolant Temperature Sensor.