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 No. 4, and No. 2 and No. 3. Paired cylinders will spark every complete crankshaft rotation (360 degrees).

The crank angle sensor, mounted on rear of intake camshaft, monitors No. 1 and No. 4 cylinder TDC, ignition and fuel injection reference points. Signals created by crank angle sensor are sent to the Electronic Control Unit (ECU).

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