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Injectors spray fuel in the highly compressed combustion chamber, and power generates through combustion process.

Fuel pressure is raised to 1600bar in common rail diesel engine for the purpose of making fuel into minute particles. And fuel devided into minute particles leads smoke reduction, high power generation, and improved fuel efficiency. To control pressure of 1600bar with solenoid, oil pressure surbo is applied. And injector solenoids is actuated by solenoid operating voltage raised to 80V with the method of current control.

Niddle valve inside of injector is located between A and B chamber. If applied pressure to B chamber is relived by injector solenoid, niddle valve is raised by the pressure of A chamber then, fuel is injected. If same pressure is applied to A and B chamber, niddle valve closes by the elasticity then, fuel injection stops.

As electronically controlled injector is applied instead of mechanical injector, pilot and post injection, injeciton duration and quantity control are achieved. And engine performance is improved by these control.

P0202 is set when no current is detected in injector power and control circuit at injector #2 operating condition. This code is due to open in injector circuit or open in injector component coil.

Fig.1) Injector operating waveform at Low side, It shows 2 pilot and 1 main injection.

Fig.2) Magnified waveform of main injection at Fig.1)