Camshaft Position Sensor (7/172 - 7/173) [2017-2022, B4204T27 | 2018-2022, B4204T28 | 2021-2022, B420T]: Description

The camshaft sensor monitors the rotation of the camshaft.

The camshaft position sensor consists of a hall sensor, a permanent magnet and internal electronics. The Engine Control Module (ECM) monitors the sensor and uses the input from the sensor to calculate the speed and position of the camshaft.

The camshaft position sensor has only one type of signal characteristic, making it impossible for the Engine Control Module (ECM) to identify the direction of the camshaft's rotation.

The camshaft position sensor detects changes in the magnetic field when the camshaft rotates. It is able to detect changes by the spacing between the teeth on the camshaft. The frequency of the return signal is proportional to the camshaft rotational speed.

The signal from the sensor is a square pulse signal between approximately 0.5 V and 4.5 V. A high signal corresponds to a "tooth" on the trigger wheel and a low signal corresponds to the "gaps" in the trigger wheel.