Among all the parts that make it possible for our vehicle to move and function properly, there is a component known as a speed sensor or VSS for its acronym in English. This component has a purpose and helps other functions of our car’s electronics and here at Proautoenthusiast.com we will tell you everything you need to know about it.
1. What is a speed sensor
The speed sensor is a device that measures how fast the vehicle is moving and sends this signal to the computer and is located on the transaxle. The information received by the ECU is used to calculate when the automatic transmission makes the change, as well as the amount of fuel to be injected when the driver presses the accelerator or measure the speed of the cruise control.
2. Where is the speed sensor located
Surely you are wondering how to test a speed sensor and be sure that it works. Well the easiest way to test a speed sensor is using an oscilloscope or multimeter and it should be in a range greater than 1V.
The vehicle speed sensor (vss) is located on the right rear of the transmission near the tailshaft or behind the dash. The signal can be ash, alternate or digital.
3. Speed sensor functionality
The speed sensor is the element in charge of transmitting the speed information, how fast our vehicle is going, to the control unit ( ECU ). Basically, it is an important part of our vehicle, since thanks to the control unit we can see when to change gear, if we are going too fast or too slow, or if our vehicle has any instrumentation problems.
As you can see, the speed sensor can also prevent us from an accident, by realizing the limit we are going to and thus braking, avoiding an infraction, etc. A malfunction indicates that it has to be replaced urgently and reported as soon as possible to the agency, this in case you continue to have your warranty policy.
It is also important to mention that if your used model has problems, you can buy one in specialized stores or online, the costs may vary and it is very essential to see the compatibilities. For this we recommend that you have a trusted mechanic or if you are an enthusiast, investigate its installation and availability beforehand.
4. Speed Sensor Faults
Previously it was a cable that performed the function of the speed sensor , but the latter turned out to be better since it does not require maintenance and is resistant to impurities, vibrations and shocks, making it more durable. However, it is not infallible either, so you have to know how to detect its faults and when we need to change it.
One of the most common failures of the speed sensor is that between it and the reduction wheel (which is responsible for sending the information to the ECU) there are particles of dirt or oxidation, which would cause a misreading of the information sent to the ECU. . Another cause of this failure could be faulty wiring within the sensor.
On the other hand, in the event that your speedometer does not work, that the Check Engine light is on, that there are problems with the cruise control or that the changes in the automatic transmission are slow, it is best to take your car to the workshop, because They are also signs that the speed sensor could be failing.
5. Speed sensor maintenance
As it is a technological device with sensors, maintenance is not required as such, since it is made to withstand vibrations and complicated conditions such as bumps and dirt, so you will not have to worry about that.
However, the symptoms of a speed sensor can vary, some of the most recurrent problems are that the speed changes do not feel very responsive, generating some delay. On the other hand, some lights can also be activated on the instrument panel, such as the service or engine.
Another way to test if everything is fine is through cruise control, if there is no constant and smooth control to regulate the speed, this may indicate a problem with the speed sensor.
If your vehicle stops unexpectedly, it may be another indication that something is wrong with this sensor, since it is not giving the correct signals to the control unit.
In case you have any of these symptoms, we recommend that if your model is recent, you take it to the agency, since the installation could become an ordeal, apart from the fact that you will not have to pay in case you still have with the guarantee policy.
Also, if you want to install it yourself, keep in mind that you might need some tools or knowledge of where this sensor is located. Take into consideration the issue of compatibilities, this so that the speed sensor that you have already bought is not in vain.
6. Other considerations
If you don’t have any problems and your model is recent, don’t worry, this component is made to last, apart from the fact that it will have to be completely replaced if you have any situation. No need to go ahead and fix it on your own.
On the other hand, at Proautoenthusiast.com we also recommend that you have a trusted mechanic so that in case your car no longer has a warranty and you don’t want to spend too much, you have the security of an expert. If you buy a sensor online, make sure it is from secure sites or specialized stores, so that your sensor is protected and does work.