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The cam shaft sensor consists of a fixed magnet and an integrated circuit that amplifies the signal from it. It uses the Hall Effect to send a square signal to the ecu or ignition module telling it at what speed the camshaft is rotating. In some sensors the signal is actually a ground signal. The camshaft will have a disc mounted on it that has small evenly spaced lowered segments and raised segments on it with the sensor mounted very close to it. As these pass by the magnet in the sensor the magnetic field fluctuates. One raised segment will have larger lowered segments on either side usually timed with TDC of the 1st cylinder.

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14y ago

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