What do IG1 and IG2 represent in automotive circuits?

1 Answers
LaIsabelle
07/30/25 6:06am
In the circuit diagram of a four-cylinder engine, IG1 and IG2 respectively drive two spark plugs of the engine. Here are the specific details: 1. Explanation: IG1 and IG2 in the circuit are markings for the live wires used in Japanese and Korean vehicles. IG1 is for high-power electrical appliances (excluding the starter), while IG2 is for the engine control unit and small electrical appliances. When the key is turned to ON, both IG1 and IG2 are powered. When turned to ST, IG1 is cut off, and IG2 and the ST terminal are powered. The reason for cutting off IG1 is to fully meet the starting requirements. IG1 and IG2 are equivalent to the X and line 15 in German vehicle circuit diagrams. 2. Four-cylinder engine: A four-cylinder engine, also known as a four-cylinder motor, is a machine capable of converting one form of energy into another more useful form of energy. Typically, it converts chemical energy into mechanical energy.
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