Ignition system — general information (Mazda 121 (3))

The ignition system creates a spark that ignites the air-fuel mixture in the cylinders. To create a powerful spark, the ignition coil converts the 12 V from the battery into a voltage of about 30,000 V.

A diesel engine does not have an ignition system, because due to the high degree of compression, the air heats up so much that after fuel injection it ignites on its own.

Gasoline engines have an electronic ignition system that does not wear out and needs to be adjusted as part of maintenance. Thanks to the use of electronic components, the ignition system works very reliably and practically does not need repair.

Since some components of the ignition system are also used to control the gasoline injection system, they can also be described in the chapter "Petrol injection system". The location of the parts is also shown schematically.

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