Ignition System: Description and Operation

Ignition System:

GENERAL INFORMATION
Interruption of the primary current flowing in the primary side of the ignition coil generates high voltage in the secondary side of the ignition coil. The high voltage thus generated is directed by the distributor to the applicable spark plug. The engine firing order is 1-3-4-2 cylinders.

On application of high voltage, the spark plug generates a spark to ignite the compressed air fuel mixture in the combustion chamber.

The engine control module makes and breaks the primary current of the ignition coil to regulate the ignition timing.

The engine control module detects the crankshaft position by the crankshaft position sensor incorporated in the distributor to provide ignition at the most appropriate timing for the engine operating condition.

When the engine is cold or operated at a high altitude, the ignition timing is slightly advanced to provide optimum performance to the operating condition.

OPERATION
^ Turn ignition switch to "ON" position, and battery voltage will be applied to primary winding of ignition coil.
^ When crankshaft position sensor signal is input to engine control module, engine control module makes ON-OFF control of ignition power transistors one by one.
^ When ignition power transistor is turned on, current flows from ignition coil (primary winding) to ground through ignition power transistor.