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CAMSHAFT POSITION (CMP) SENSOR CONSTRUCTION/OPERATION [L3 Turbo]

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• Installed on the engine head cover.
• Four pulses per one camshaft rotation are detected by a wide projection and a narrow projection installed on the intake air side camshaft.
• Consists of an IC with a giant magneto resistive (GMR) element and an integrated signal processing circuit, and a magnet. Signal reliability has been improved with the adoption of the GMR element resulting in the signal amplitude being wider compared to the hall element.
• Signal detection uses the special characteristics of GMR to change the electrical resistance corresponding to the magnetic field.
• The size of the magnetic field detected by the GMR element is changed into short waves at the signal processing circuit, and then input to the PCM as a sensor output signal.
• If the camshaft position sensor is removed/installed or replaced, magnetized objects such as metal shavings adhering to the sensor could cause distortion in the magnetic flux of the magnetic pickup coil, causing abnormal sensor output which could adversely affect the engine control.

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1 | CMP sensor
2 | Rotation
3 | Camshaft
4 | CMP output signal
5 | No.1 cylinder TDC
6 | No.3 cylinder TDC
7 | No.4 cylinder TDC
8 | No.2 cylinder TDC
9 | Main relay