Crankshaft Position (CKP) Sensor
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
The CKP sensor detects crankshaft angle at 10-degree intervals on all models except Miata. On Miata, sensor detects crankshaft angle at 60-degree intervals. This provides the PCM with data to trigger the ignition coils.