What is the difference between CAMSHAFT POSIT. SENSOR and CRANKSHAFT POSIT. SENS

P0340 is for the Camshaft sensor circuit malfunction. The Crankshaft sensor read the position of the crankshaft, while the Camshaft sensor reads the position of the camshaft, and when they are on the same page they give a reference signal to the PCM so that the plugs, and the injectors work properly in keeping your engine running. The short version, to help you understand better.