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/ alandiegonavarro The purpose of the Rotation Sensor is to send an electrical signal to the injection module that enables the system to be synchronized: injection time, ignition advance, engine top dead center, etc. This sensor, assembled with a permanent magnet and a coil, is connected to the phonic wheel and produces a magnetic flux alternating between maximum, at the position of the wheel tooth, and minimum, in the cavity of the teeth. This variation in magnetic flux, due to the passage of the teeth, is enough to generate an electrical voltage that varies according to the engine rotation. Its signal is considered one of the vital signs for the engine to start running. If the Rotation Sensor does not inform the ECU that the engine has started to rotate, the engine will not start.