Electronic Ignition System

The electronic ignition system controls triggers the ignition coil using signals from the ECU based on crankshaft position, engine speed, vehicle speed, and inputs from fuel injection ECU. Turbo models use a Hall Effect sensor, located in the distributor, to determine crankshaft position and engine speed. All other models use a flywheel sensing permanent magnet generator to determine crankshaft position and engine speed. The ignition coil receives battery voltage through the fuse panel and is grounded through the power stage (power transistor). When the ECU is signaled of proper crankshaft position, the power stage removes the ground from the coil, firing the plug.