DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2): Description

The camshaft position sensor, like the crankshaft position sensor, consists of a coil, a magnet and an iron core wrapped in copper wire. The camshaft has a tooth and the camshaft position sensor is installed so that it can detect the tooth passing by. When the camshaft rotates and the tooth passes by the camshaft position sensor, the magnet on the camshaft position sensor creates a magnetic field and voltage is generated in the copper wire. When the camshaft makes one full rotation, voltage will be generated in the camshaft position sensor once. The crankshaft position sensor is basically the same. When the crankshaft makes one rotation, its 34 teeth pass by the crankshaft position sensor and voltage is generated 34 times. The camshaft rotates at half the speed of the crankshaft. Therefore, the camshaft position sensor generates voltage once in the time the crankshaft makes 2 rotations. The ECM detects generation of these voltages to indicate the cylinder.