Crankshaft Position (CKP) Sensor

CKP sensor is a 2-wire, Permanent Magnet (PM) generator which protrudes through the side of the engine block to within .05" (1.3 mm) of an internally-mounted crankshaft reluctor ring. The reluctor ring is a special trigger wheel (notches) cast into the crankshaft. An extra notch in the reluctor ring delineates TDC for No. 1 cylinder. As crankshaft rotates, notches in reluctor ring change the magnetic field at the tip of the CKP sensor. This creates an induced AC voltage signal in the sensor windings, resulting in reference signals which are sent to PCM by ignition control module. This allows PCM to compute crankshaft position and RPM and fire appropriate ignition coil at the proper time.