Engine Coolant Temperature Sensor: Inspection

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Fig 1: Identifying Engine Coolant Temperature Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the sensor.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	2.32 to 2.59 kΩ
1 - 2	80°C (176°F)	0.310 to 0.326 kΩ

NOTE: If checking the sensor in water, be careful not to allow water to contact the terminals. After checking, dry the sensor.

Fig 2: Resistance And Temperature Graph

If the result is not as specified, replace the engine coolant temperature sensor.