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CAMSHAFT POSITION (CMP) SENSOR CONSTRUCTION/OPERATION [MZR-CD (RF Turbo)]

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• The CMP sensor is installed on the upper part of the gear case on the engine rear.
• Consists of an IC in which a magneto resistance element (MRE) and signal processing circuit have been integrated, and a magnet. Sensor output signal reliability has been improved with the adoption of the MRE resulting in the detection signal amplitude being wider compared to the Hall element.
• Signal detection uses the special characteristics of MRE to change the electrical resistance corresponding to the magnetic field and magnetic flux changes.
• The change in magnetic flux detected by the MRE (MRE output) are changed into short waves or rectangular waves at the signal processing circuit, and then input to the PCM as a sensor output signal.
• Five pulses are detected per one rotation of the camshaft by the projections on the drive gear plate (component with drive gear) which is installed to the rear of the camshaft.
• If the CMP sensor is removed/installed or replaced, magnetized objects such as metal shavings adhering to the sensor could cause fluctuation in the magnetic flux of the MRE, causing abnormal sensor output which could adversely affect engine control.

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1 | CMP sensor
2 | Cylinder head
3 | Drive gear plate
4 | Cam angle
5 | Sensor output
6 | 4 V or more
7 | Below 1 V
8 | Ground