CMP senses the CMP(Camshaft Position Sensor) point of NO.1,4 cylinder on its compression stroke. Its signal is fed to ECM to be used to determine the sequence of fuel injection.

Crank angular sesor senses the crank angular of each cylinder, and input the pulse signal to ECM. Its signal is fed to ECM to be used to determine the engine speed and adjust the fuel injection timing and ignition timing.