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Piston position on combustion chamber is the substantial to define the starting of injection timing. All engine pistons are connected to crankshaft by connecting rod. Crankshaft position sensor (CKPS) senses the information concerning all piston positions and uses this signal to calculate the injection timing and engine speed. Camshaft position sensor (CMPS) senses the position of camshaft in reference to the upper dead point of compression of cylinder and sends this signal, based on which the ECM determines the injection sequence of each cylinder and the fuel injection timing.