The role of crankshaft position sensor is to determine the position of the crankshaft, which is the corner of the crankshaft. It usually works with the tu lun position sensor to work together to determine the basic ignition moment. We dou zhi dao, the engine starts ignition at the end of the compression stroke, so how did the engine computer know which cylinder should be ignition? It is calculated by the crankshaft position sensor and tu lun zhou position sensor, through crankshaft position sensor, you can know which cylinder piston is in center, through tu lun zhou position sensor, you can know which cylinder piston is in the compression stroke. So, the engine knows when to give it to which cylinder to fire?