What does it mean?
The diesel fuel system contains a low-pressure and high pressure side. The low pressure side consists of the tank, pump, filters, water separator, bleeder valves and necessary fuel lines. The high pressure side varies according to injection type, but typically consists of a high pressure pump and fuel rail. A typical common rail diesel fuel system The fuel volume control valve (FVCV) is found on high pressure pump on most modern common rail diesel engines.
It regulates the volume of fuel from the internal transfer pump to the high pressure pumping components. The valve adjusts the low pressure side of the system to meet the demands of the engine. The FVCV is a duty cycle controlled solenoid controlled by the PCM. One side of the solenoid receives battery power, and the other is intermittently grounded by the PCM. The combination of the FVCV and the fuel pressure control valve (FPCV) is used to correctly supply fuel to the engine.
The fuel pressure sensor monitors FVCV and FPCV operation and informs the powertrain control module (PCM) of any changes. A typical fuel volume control valve and high pressure pump The code P0003 stands for fuel volume regulator control circuit. The PCM monitors the state of the FVCV circuit and sets this code when it finds a low circuit.
Note: Circuit Low Input codes are often the result of low battery voltages (that can have many possible causes), bad connections across electrical connectors or previously repaired wiring, as well as corrosion in electrical connectors.
Other possible causes of low input voltages include poor installation of aftermarket components, poor quality aftermarket components like fuses, relays, and switches, and modification of the electrical system that could include the use of conductors that are not rated for use in a particular application. However, poor connections often result in high resistances in some parts of the circuit, which is why it is important to perform resistance and continuity checks during the diagnostic procedure.