July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Crankshaft Position (CKP) Sensor
The CKP sensor detects crankshaft speed and is used by the ECM/PCM to determine ignition timing and timing for fuel injection of each cylinder as well as detecting engine misfire.
Fig 1: Identifying Crankshaft Position (CKP) Sensor