CRANKSHAFT POSITION SENSOR - CKP SENSOR

POST UPDATED IN November, 2020

What is the CKP sensor?

The Crankshaft Position Sensor is located in the lower part of the engine, on the right side, near the crankshaft pulley. It is known as a variable reluctance sensor, since it is a permanent magnet generator. This produces a voltage that varies both the frequency and its amplitude, which are defined by the speed of the crankshaft.

How does the CKP sensor work?

The CKP sensor works in conjunction with a 58-tooth pick wheel, which is adjusted to the crankshaft. As each tooth of the collector wheel rotates is turning, a magnetic field is obtained, and this creates an on / off pulse of 58 times per revolution of the crankcase. The ECM (Engine Control module) takes the pulsations and in this way determines the position of the crankshaft.

The Engine Control Module synchronizes the ignition regulation, the injector regulation and the sparks blow, in comparison with the inputs of the CMP (Camshaft position sensor) sensor and the CKP (Crankshaft position sensor) and thus accurately specify the engine position. The Crankshaft Position Sensor consists of a permanent magnet and a coil, which work based on the interruption of the magnetic field by the passage of the teeth.

It usually has 2 cables and, in some cases, it can have 3. In case of having the third cable, it works as a coaxial protector, and in this way, it prevents interference in the signal.

 

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