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3.3.8 Pressure regulator
The pressure regulator is a valve controlled by a square wave duty cycle. It is installed on the high-pressure fuel
pump or on the common rail pipe and controls the common rail pressure together with the flow control valve. The
pressure relief valve simply controls the amount of high-pressure oil entering the oil return system, thereby
increasing or decreasing the fuel pressure of the common rail pipe. Use a BNC to banana cable, connect one end to
channel 1 of the oscilloscope, the other end of the black plug is grounded, and the red connector is pierced into the
end of the pressure regulator signal line with a needle probe.
Use ATO oscilloscope to test the pressure regulator, the specific operation is shown in Figure 3-34:
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