![]() See Also: Does Your RPM Fluctuate While Driving (8 Causes) Reasons Your Speedometer Doesn’t Work Likewise, deceleration causes an opposite reaction, in regards to speed sensor pulse rate. The pulse rate detected by a vehicle’s speed sensor increases upon acceleration, thereby varying the signal presented to the corresponding module. These pulses are interpreted by a vehicle’s control module, which then sends a correlated signal to the vehicle’s instrument cluster. These speedometers utilize a speed sensor that detects pulses from the teeth of a gear, mounted on the output side of a vehicle’s transmission. ![]() Modern vehicles now rely upon the use of electronic speedometers. The rotation of this speed cup sweeps the attached gauged needle, thereby providing motorists with an accurate reading of their vehicle’s speed. The resulting magnetic field placed the speed cup, itself, into motion. At the opposing end of the speedometer cable, was a magnet, which spun within a speed cup. Most of these systems utilized a flexible cable, which was affixed to a gear, driven by the transmission’s output shaft. The vast majority of early speedometers were of a cable design. For decades, vehicles of every type have come standard with an in-dash speedometer. Quite simply, a speedometer is a device that measures the speed of a vehicle’s travel, to a high degree of accuracy. How Much Does it Cost to Fix a Speedometer?.Can You Use Your Phone as a Speedometer Instead?.Can You Still Drive Your Car If the Speedometer Doesn’t Work?.
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