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9. The top box is the Delta Current Control (DCC) Pulse Width Modulation (PWM) controller. This is the muscle part of the fuel control system. The battery and fuel pump power connections are made here. The lower box is the VaporWorx Signal Conditioning Module (SCM). This is the brains of the fuel control system. It interprets the data from various sensors in order to control the speed of the PWM power output of the DCC controller.