Camshaft position sensors and crankshaft position sensors are essential components in modern internal combustion engines. Their primary function is to monitor the position and rotational speed of the camshaft and the crankshaft which is crucial for the engine control unit (ECU) to manage the timing of the engine's fuel injection and ignition systems.

Both camshaft sensor and crankshaft sensor work in conjunction to maintain precise timing between the camshaft and crankshaft. This coordination is essential for engines with variable valve timing systems.

Sensors provide real-time data on the position of the camshaft and the crankshaft. This information helps the ECU determine the position of each piston within the cylinders and so which cylinder is on its power stroke in order to adjust the fuel injection and ignition timing accordingly.

By monitoring the camshaft's and crankshaft’s position, the sensors help ensure that the engine's valves open and close at the correct times in relation to the piston's movement. This ensures that the fuel-air mixture is ignited at the optimal moment for efficient combustion.

Also, accurate position data from those sensors are necessary for the engine to start properly. It allows the ECU to identify the correct stroke cycle and fire the spark plugs at the right moment