Engine Coolant Temperature Sensor: Inspection

WARNING: This page is about a different car, the 2008 Lexus GS 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 water and warm up the water.

Fig 1: Locating Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Measuring Resistance Between Engine Coolant Temperature Sensor Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance between the terminals.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

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

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

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