| A magnetic, hall effect, optical or magneto resistive sensor usually mounted internally in the engine, externally to the engine are in the distributor to inform the ECM or PCM of the crankshaft position location of No. 1 piston, and crankshaft speed for ignition timing and other calculationneeded by the system where RPM is in input. | |
| Crankshaft position sensor | |
| A code that represents and can be used to identify a malfunction in the computer control system. | |
| The part of a battery made from two dissimilar metals and an acid solution. A cell stores chemical energy to be used later as electrical energy. |