Lumina V6-3.8L VIN K (1998)
unevenly spaced blades and windows of different widths. The CKP Sync portion of the crankshaft position sensor produces 3 different length ON -
OFF pulses per crankshaft revolution. When a CKP Sync interrupter ring window is between the magnet and inner switch, the magnetic field will
cause the CKP Sync Hall effect switch to ground the Camshaft Position Sensor (CMP) Sync signal voltage supplied from the ignition control
module. The CKP 18X interrupter ring and Hall-effect switch react similarly. The ignition control module interprets the CKP 18X and CKP Sync
ON - OFF signals as an indication of crankshaft position, and the ignition control module must have both signals to fire the correct ignition coil.
The ignition control module determines crankshaft position for correct ignition coil sequencing by counting how many CKP 18X signal transitions
occur, i.e.; ON - OFF or OFF - ON, during a CKP Sync pulse.
