Circuit description

Fuel pump circuit (low pressure side) consists of engine control computer, fuel pump ASSY (low pressure side) and fuel pump control computer ASSY that operates the fuel pump ASSY (low pressure side). Based on engine output, engine control computer determines the speed of fuel pump ASSY (low pressure side). The speed is converted into the load signal, and the signal is transmitted to the fuel pump control computer ASSY. Based on the signal transmitted from the engine control computer, the fuel pump control computer ASSY adjusts the operating speed of the fuel pump (low pressure side).