One of the main features in using the common rail system is independent control of fuel injection by the engine computer. This independent control allows for emission and power optimization in the design process. Noise reduction, knock reduction and overall combustion efficiency also arise from the use of pilot injection. The 6H pilot injection injects a small amount of fuel just prior to the conventional fuel injection pulse. This pilot injection has been a strong factor in the effectiveness of the 6H in achieving lower NOx emissions and more responsiveness in cold starting conditions.

The pilot injection feature improves engine performance on the 6H in any operating condition. The fuel injection process is further enhanced by the self-diagnosing features found on the closed loop fuel control system. The common rail system detects engine conditions (engine speed, accelerator pedal angle, coolant temperature, etc.) by means of its sensors and feeds back this data to the fuel injection algorithm calculations.

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