Engine Coolant Temperature Sensor: Inspection

WARNING: This page is about a different car, the 2006 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Partially insert the sensor into the water and warm up the water.

Measure the resistance between the terminals.

Fig 1: Measuring Resistance Between Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

SPECIFIED CONDITION CHART

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 ECT sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.