The Camshaft position sensor or CMP communicates the Powertrain Control Module (PCM) the exact location of the camshaft and the timing of the distributor.
The crankshaft position sensor (CKP) gives the PCM information about the crankshaft position and crankshaft synchronization. This information is used for engine RPM.
If there is an electrical problem in one of the above-mentioned sensor circuits, the DTC code P0321 OBDII is stored and the Check Engine is illuminated. It should be noted that this code is only identified as a fault in the electrical circuit.