How does the coolant temperature sensor test work?

He has certifications in automation and control technology. The engine coolant temperature (ECT) sensor test is simple and can help you fix your car faster. You can do it at home using a digital multimeter and a cooking thermometer. A bad engine coolant temperature sensor affects engine performance:

What are the diagnostic codes for coolant temperature?

You may see one of the following diagnostic trouble codes: P0115….Engine Coolant Temperature Circuit P0116….Engine Coolant Temperature Circuit Range/Performance P0117….Engine Coolant Temperature Circuit Low Input P0118….Engine Coolant Temperature Circuit High Input P0119….Engine Coolant Temperature Circuit Intermittent

Why is the coolant temp on my ECT sensor low?

This DTC tells you that the PCM is seeing a coolant temperature of -46° F (-50° C). In technical terms, the PCM is seeing a very high voltage drop across the ECT sensor’s circuit, which it translates into an extremely low temperature. Coolant temp sensor’s wires have an ‘open-circuit’ problem (usually due to a cut wire).

How can I get the coolant temperature of my car?

Get the engine surface temperature using an infrared thermometer or suitable cooking thermometer. Take the engine temperature on a location near the coolant temperature sensor. Okay, at this point you may be wondering why you need to take the engine temperature to troubleshoot the sensor.

Where do I find the coolant temperature sensor?

What is a Coolant Temperature Sensor and How Does It Work? A coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.

What are the symptoms of a bad coolant sensor?

Common symptoms of a bad engine coolant sensors are overheating, hard starting conditions, poor idle, check engine light ON and the electric fans do not work properly. The easiest way is to read the trouble code memory and check the value from the sensor, to make sure it’s a possible value.

When your coolant temperature sensor should be replaced?

Often, the engine coolant temperature sensor must be replaced at about 100,000 miles. If you don’t properly maintain the engine cooling system, the sensor could fail much earlier. If that happens, the check engine light will come on, and then a service technician will use a diagnostic scan tool to determine the problem.

What does a bad coolant sensor do?

A failing coolant temperature sensor will prevent a vehicle’s engine from entering a closed loop. This will cause the vehicle to run rich meaning the engine’s fuel mixture will have a higher percentage of fuel to air which will result in diminished fuel economy.

Can a bad coolant sensor cause a car to not start?

Some cars use the engine coolant temperature sensor to control the electric cooling fans. You have two separate temperature sensors for the fans, dashboard gauge, and engine management in most cars. However, if your car has a single sensor, a bad engine coolant temperature sensor may result in your fans won’t start at all.

How can I test if my engine cooling fan is working?

That’s why you will need to test it. Unplug the fan connector closest to the fan. Make up some jumper cables. Then connect them directly, from the battery to the fan motor, to see if it spins. Consequently, if it does not spin it is blown.

Why is my engine cooling fan not working?

Your engine cooling fan, only runs when needed to help cool the engine. So, a engine cooling fan, relay or control circuit failure is bad news. Because, it can allow the engine to overheat. The engine coolant sensor or a separate engine temperature switch, is used to monitor engine temperature.

How does the coolant temperature sensor test work?