Electronic Ignition: Notes

On 4-cylinder engines, electronic ignition ECU controls primary windings of ignition coil using signals from fuel injection ECU based on crankshaft position, engine speed and vehicle speed. Turbo models use a Hall Effect sensor, located in distributor, to determine crankshaft position and engine speed. Non-turbo models use a flywheel sensing permanent magnet generator to determine crankshaft position and engine speed.

On 6-cylinder engines, each cylinder is equipped with an individual ignition coil, eliminating the distributor. ECU computes instant at which each ignition coil must deliver its high voltage pulse. All six coils are controlled by 2 power units.