Rick's Free Auto Repair Advice

Posts Tagged: CTS

Test engine coolant temperature sensor ECT

How to test an engine coolant temperature sensor An engine coolant temperature sensor is usually a variable resistor that changes resistance and thus voltage as the coolant temperature changes. To test the sensor, you can remove the electrical connector and check the resistance value of the sensor and compare it to specs. If it’s way off, replace it. But if it’s close, you really need to perform a voltage test, since it’s far more accurate than an ohm test. To test the voltage, you’ll need to either back probe the … Read More


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