DISTRIBUTORLESS Ignition System: Miata

The distributorless ignition system contains a crankshaft angle sensor to control ignition timing. Two individual ignition coils are used to send spark to cylinders No. 1 and 4, and cylinders No. 2 and 3. Paired cylinders will spark every complete crankshaft rotation (360 degrees).

The crank angle sensor, mounted on rear of intake camshaft, monitors TDC of cylinders No. 1 and 4, ignition and fuel injection reference points. Signals created by crank angle sensor are sent to PCM.

PCM delivers ignition signals to the ignitor to control ignition. Ignitor triggers appropriate ignition coil. Power for ignition coils is supplied from ignition switch.