Electronic Ignition System Description

GENERAL DESCRIPTION
Ignition is done by the electronic ignition (EI) that directly fires the spark plugs from ignition coils through spark plug wires without using a distributor. A pair of ignition coils for the cylinders having different phases by 360 ° (No.1 and No.4, No.2 and No.5, No.3 and No.6) are fired simultaneously.

Since the cylinder on exhaust stroke requires less energy to fire its ignition plug, energy from the ignition coils can be utilized to fire the mating cylinder on compression stroke. After additional 360 ° rotation, respective cylinder strokes are reversed.

The EI consists of six ignition coils, ion sensing module, crankshaft position sensor, powertrain control module (PCM) and other components.

The crankshaft position coils are connected with the PCM by means of a 80 pin connector.

The PCM and ion sensing module turn on/off the primary circuit of ignition coils.

A notch in the timing disc on the crankshaft activates the crank position sensor which then sends information such as firing order and starting timing of each ignition coil to the PCM.

Further, the EI employs ignition control (IC) to control similar to a distributor system.

By receiving signals such as crank position, engine speed, water temperature and Manifold Absolute Pressure (MAP), combustion quality, the PCM controls the ignition timing.