Note: An illuminated ABS sensor or a traction control light can also indicate issues with the speed sensor. In such a situation, it’s best to take your car to a mechanic for an inspection. And this error can activate your car’s engine light. With a faulty speed sensor, an electronic control unit within your car might fail to detect a transmission speed sensor signal. However, it can also signal a defective speed sensor. If the Check Engine Light on your car’s dashboard gets illuminated, it can be due to a variety of reasons, like: If you notice that the speedometer is acting odd, consider getting your car inspected by a mechanic to check for any speed sensor failures. However, with a malfunctioning speedometer, you’ll have no clue about how fast your car’s going, which can compromise your road safety. This doesn’t mean that your car would simply stop working and you can’t drive it anymore. A faulty speed sensor can result in inconsistent or erratic speedometer readings.Īlternatively, it can result in no readings at all. Most cars depend on signals from the wheel speed sensor to adjust their speedometer readings. If you experience any of these symptoms while driving, you might need to get the vehicle speed sensor inspected and replaced: 1. Since your car’s speedometer reading, anti lock brakes, ignition timing, transmission system, and cruise control depend on signals from the speed sensor, you need to ensure that it’s working as expected. What Are The Symptoms Of A Faulty Speed Sensor ? Instead, it detects the wheel rotation speed to send a digital signal to the ABS system. These sensors don’t require additional voltage. Passive SensorĪ passive sensor is also known as an inductive sensor or variable-reluctance magnet sensor (VR sensor). It then converts the voltage to a digital signal and sends it to the ABS system.Īn active sensor can sense the wheel direction and is more efficient at slow speed. The active sensor only works when supplied with a voltage. This allows the calculation of pulses per second, which is then used to measure vehicle speed. This sensor consists of a magnet (powered by a speedometer cable) and a reed switch.įor every rotation, the magnet turns the reed switch on and off around 4 times. The ABS system is responsible for measuring the car’s velocity. This voltage is then transmitted to the processing units of the ABS system. Hall Effect SensorĪ Hall effect sensor consists of a reluctor that moves against that hall sensor to produce a magnetic field (magnetic flux) and thereby a voltage. Note: Speed sensors are usually found in devices that need a contact-free speed measurement system. Without it, your car wouldn’t be able to maintain a constant vehicle speed. Your car’s cruise control and traction control system may also rely on data generated by the speed sensor. In turn, the ECUs use this square wave signal to adjust your car’s speedometer readings, throttle position, ABS system, ignition timing, anti lock brakes, and transmission system. The sensor then relays the signal to your car’s electronic control units (ECUs). Then, it converts this speed measurement into an analog signal or a low voltage square wave signal that varies according to the magnetic flux (if it’s an inductive sensor). The vehicle speed sensor measures the rotational speed of the gears in your transmission system. Some sensors can also detect the direction. ![]() The speed sensor or the ABS sensor is part of the engine sensor control, which usually includes a temperature sensor, pressure sensor, crankshaft position sensor, etc. It’s also known as a wheel speed sensor, transmission speed sensor, or output shaft speed sensor. What Is A Speed Sensor ?Ī vehicle speed sensor (VSS) is a small component mounted on your car’s transmission that lets the car’s onboard computer know how fast you’re moving. The Best Way To Keep Your Speed Sensors In Check.How To Replace Your Car’s Speed Sensor?.How Much Does Speed Sensor Replacement Cost?.How Often Should You Replace The Vehicle Speed Sensor?.What Are The Symptoms Of A Faulty Speed Sensor?.
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