A bad speed sensor most often affects the shifting of the automatic transmission. However, in cars with an onboard computer, the sensor also affects the ABS system, speedometer, cruise control and power steering. Proper diagnosis and repair is essential for safe operation of the car.Continue Reading
The speed this sensor monitors is that of the engine. The sensor transmits the information to the computer, which automatically makes the necessary adjustments to keep the engine and other components operating at top efficiency. If the sensor sends faulty information to the computer, the computer returns faulty information to these other systems.
The speed sensor attaches to the engine's crankshaft. It is a metal disk with teeth around its circumference. The sensor also includes a stationary magnetic coil. The spinning of the crankshaft creates an induction current around the coil. The teeth on the edge of the disk cause obstructions in the magnetic field, allowing the computer to determine the speed at which the crankshaft and engine are turning.
For diagnosis of this type of problem, take the car to a general auto repair shop. Even though these symptoms mimic transmission problems, the general shop is equipped to make the diagnosis using a scan tool and then direct the customer to a specialty shop if necessary.Learn more about Car Parts & Maintenance
A crank sensor is an electronic device on most automobiles that detects engine speed by monitoring the rotation of the crankshaft. Most newer vehicles us a crank sensor in conjunction with camshaft position sensor to provide data that the automobile's computer uses to coordinate the engine ignition sequence.Full Answer >
To replace a transmission speed sensor, jack up the front of the vehicle, locate the speed sensor, remove the electrical plug, remove the speed sensor and replace with a new sensor. A faulty speed sensor causes the speedometer not to work.Full Answer >
When problems occur with the speed sensor, the vehicle does not send the right signal to the speedometer, regulate fuel properly, operate cruise control or regulate ignition timing correctly. Problems with the speed sensor are the result of wear and tear and have a direct effect on the performance of multiple systems in the vehicle. The most common symptom of a malfunctioning speed sensor is a malfunctioning speedometer.Full Answer >
The speed sensor of a vehicle is usually located on either the transmission case or the rear differential assembly of production vehicles. Check your vehicle’s service manual or spare parts catalogue before looking for its speed sensor because vehicle speed sensors come in several different designs depending on the manufacturer.Full Answer >