Mercedes-Benz C240 Crankshaft Position Sensor is a miniature electronic magnifier that informs the computer in the car precisely where the crankshaft is located and at what speed it rotates so that the spark and fuel are supplied at the correct time. The sensor reads a toothed wheel on the crank pulley, flywheel, camshaft, or the shaft itself to generate timed electric pulses which the powertrain control module uses to create ignition and fuel injection signals which also assist in coordinating variable valve timing and a smooth engine startup in Mercedes-Benz powertrains. There are four styles of sensing that Mercedes-Benz has employed throughout the years. The variants of the inductive Crankshaft Position Sensor are based on a simple coil and magnet, which generates a voltage when the metal teeth pass through it; as such, they are rugged and incapable of detecting a stationary crank. Active devices that can spot moving and stationary magnetic fields are the Hall Effect and magnetoresistive units which enhance accuracy in low-speed performance as well as in hot-start performance. Optical types take advantage of a light beam to tally edges on a disc that has been slotted, providing razor-sharp timing signals, but dirt can obstruct the beam. Every current-day sensor is airtight to oil and water as the traditional culprits of failure are heat, vibration, and corrosion. When the Crankshaft Position Sensor fails, the C240 will either crank but not start, or it will stumble, miss, and shut down after it warms up; due to a lack of a clean signal, the Mercedes-Benz engine will run blind.
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