CKP - Crankshaft Position Sensor/ CMP - Camshaft Position Sensor

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DESCRIPTION
The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pickup coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and a magnet. The sensor plate rotates and, as each tooth passes through the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

DESCRIPTION
The Camshaft Position (CMP) sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the CMP sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft
turns twice, the voltage is generated 3 times in the CMP sensor. The generated voltage in the sensor acts
as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition
timing, fuel injection timing, and the VVT system.


Reference: Inspection using an oscilloscope.
HINT:
• The correct waveform is shown.
• G2+ stands for the Camshaft Position (CMP) sensor signal, and NE+ stands for the CKP sensor signal.