CAMSHAFT POSITION (CMP) SENSOR CONSTRUCTION/OPERATION [ZY]

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• The CMP sensor is installed to the cylinder head cover.

• The CMP sensor detects six pulses with one rotation of the camshaft by the projections set on the intake-side camshaft.

• A GMR element has been adopted.

• The CMP sensor is composed of an integrated circuit with a built-in GMR (Giant Magneto Resistance) element and signal processing circuit, and a magnet. With the adoption of the GMR element, the signal amplitude measured against the Hall element is larger, improving signal reliability.

• Signal detection utilizes the GMR characteristic in which electrical resistance changes according to magnetic flux.

• The shape (GMR output) of the magnetic flux detected by the GMR element is changed into a rectangular wave by the signal processing circuit and input to the PCM as a sensor output signal.