Engine Coolant Temperature Sensor: Rio

1. Disconnect negative battery cable. Remove temperature sensor, suspend sensor in container filled with water. Connect DVOM between temperature sensor terminals. Fig 1.
2. Heat water and check resistance at specified temperatures. See TEMPERATURE SENSOR SPECIFICATIONS  table. If resistance is not as specified, replace temperature sensor.

TEMPERATURE SENSOR SPECIFICATIONS

Temperature °F (°C)	Resistance Ohms
-4 (-20)	13.44-16.83
68 (20)	2.27-2.64
176 (80)	0.21-0.43

Fig 1: Testing Engine Coolant Temperature Sensor

Courtesy of KIA MOTORS AMERICA, INC.