Ignition System: Description and Operation

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 - 2 - 3 - 4 - 5 - 6 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. This sensor is installed at the front end of the crankshaft to provide ignition at the most appropriate timing for the engine operating condition.

When the engine is cold, the ignition timing is slightly advanced to provide optimum performance to the operating condition.