Engine Coolant Temperature Sensor: Inspection

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Partially soak the sensor in the water and warm up the water.

Fig 1: Measuring Resistance Between Engine Coolant Temperature Sensor Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Measure the resistance between the terminals.

Standard resistance

TERMINALS RESISTANCE REFERENCE

Condition	Specified Condition
Approx. 20°C (68°F)	2.32 to 2.59 kΩ
Approx. 80°C (176°F)	0.310 to 0.326 kΩ

If the result is not as specified, replace the sensor.

NOTE: When checking the sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.