When Monitored:
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
While engine is running. The Powertrain Control Module (PCM) monitors the position of the notch on the crankshaft speed sensor target and the camshaft speed sensor target. If the two positions do not match, the PCM then determines that there is a mechanical mis-alignment between the two sensors.