Rotation Sensor: What It Is And What Happens When It Is Faulty

Do you want to ask your questions about the rotation sensor? So you are in the right place. In today’s article, I will explain how to identify problems and much more about this piece.

The car is really a machine with several particularities and many parts to be understood and known. Among the main ones, we can mention the timing belt, spark plugsCV joint etc. But, we cannot fail to mention the rotation sensor, essential for the car to be able to perform its functions and function correctly.

The main function of the rotation sensor is to measure the engine rotation speed (RPM), through digital pulses captured in another important part of the car, the crankshaft sprocket, which passes it on to the central. Keep reading this article and discover everything you need to know about this piece!

After all, what is the rotation sensor?

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The RPM sensor is an essential component in the car’s electronic injection system. So fundamental, that in some models, the car can stop working if the part is in trouble.

With the end of distributors, the rotation sensor began to gain relevance for cars. He became responsible for sending the negative pulses to the car’s injection plant, functioning as a magnet wrapped around a coil inside a cylindrical and sealed container.

Therefore, it is important to carry out predictive and preventive maintenance not only on the rotation sensor but on all parts of the car, avoiding serious problems and a fortune in vehicle repair expenses.

Below we will show you some more specifics of this important part for the car, such as the price to exchange it, when it should be replaced, and if something can be done when it starts to show signs of trouble, among others.

How does the rotation sensor work?

The rotation sensor informs the electronic control unit of the rotation and instantaneous position of the crankshaft. In technical and mechanical terms, this is the most important part of the car’s operation.

This process of exchanging and sending information is considered so important because it is at this moment that the engine control unit calculates the exact moment for the electronic injection to start performing its work.

Therefore, the rotation sensor is a vital part of the functioning of the car’s engine. The UNO is an iconic example of the kind of car that won’t work if that part isn’t in perfect condition.

How do identify problems in the rotation sensor?

The rotation sensor is a very particular piece when it comes to troubleshooting, as in almost all cases, replacement is the only possible way out. However, some procedures can be tried before having to resort to replacing the part.

The first way out is to inspect the sockets or plugs that exist on the way to the injection center. It could be that there is some kind of bad contact in these parts that could be interfering with the proper functioning of the sensor.

In addition, excess dirt on the tip of the rotation sensor, especially for those who usually walk on different terrains, such as clay and earth, can paralyze or even ruin this part. This type of defect can make the car engine not work, as if it were having a dry pan due to lack of fuel.

In some more specific cases, the engine may run momentarily until it shuts down after a few minutes. Another symptom that the RPM sensor may be having problems with is when the engine RPM becomes erratic.

How to test the rotation sensor?

These are other procedures that will ensure that the part is working well and does not need to be replaced. To test the sensor there are some alternatives, as with the multimeter, which will evaluate the voltage of alternating current sent by the rotation sensor, in addition to evaluating the electrical resistance of the inductor.

Testing with an oscilloscope, in turn, will analyse some signals from the rotation sensor, such as frequency, amplitude, waveform, and other information. This type of test is a little more specific, mainly because it uses a tool that, in general, we don’t have at home.

If you want to carry out more in-depth tests to learn more about the rotation sensor, it is best to look for a specialized mechanic, who will certainly have the necessary tools and machinery to diagnose the condition of the part and its useful life.

Price of a rotation sensor

If after all these tests you identify problems with the rotation sensor, the indication is that the device should be replaced as soon as possible. It is worth mentioning that it is not recommended to exchange the part for a used or second-hand one. The risk of it not lasting, and you’re throwing your money and the health of your car in the rubbish, is great.

The rotation sensor has an average price of R$80. A very affordable value for a part that has a long life, in addition to cheap labour. But remember to carry out this exchange and maintenance with a specialist.

Car accelerating alone is a problem with the rotation sensor?

Not directly. If your car’s engine is revving on its own when you’re at a traffic light or with the car moving, you may have a loose crankshaft. When stepping on the clutch, the rotation sensor ends up transmitting incorrect information.

If you still have questions about the rotation sensor, please let us know! Minuto Seguros is always available to help you protect your car

Avoid unforeseen events: quote your insurance 

Have you ever thought if a problem occurs in your car, and you don’t have  GEICO insurance with 24-hour assistance? What if you have your car stolen, stolen, or have an accident that results in a total loss? All of these are events that may be covered by insurance.