System Description

FUEL PRESSURE CONTROL : System Description


INPUT/OUTPUT SIGNAL CHART






SYSTEM DESCRIPTION






Low fuel pressure control
- The low fuel pressure pump is controlled by the fuel pump control module (FPCM) and pumps fuel according to a driving condition. The pumped fuel passes through the fuel filter and is sent to the high pressure fuel pump. FPCM controls the low pressure fuel pump, according to a signal from ECM as shown in the table below.





- Low fuel pressure is adjusted by the fuel pressure regulator.

High fuel pressure control
The high pressure fuel pump raises the pressure of the fuel sent from the low pressure fuel pump. Actuated by the camshaft, the high pressure fuel pump activates the high pressure fuel pump solenoid based on a signal received from ECM, and adjusts the amount of discharge by changing the timing of closing the inlet check valve to control fuel rail pressure.