Description & Operation: Operation
- The Engine Control Module (ECM) sends target fuel pressure to the Fuel Pump Control Module (FPCM) via CAN network.
- The Fuel Pressure Sensor (FPS) sends to the FPCM measures the fuel pressure of the low pressure fuel line between the low pressure and high pressure fuel pump. The FPCM sends this pressure information to the ECM. In addition, the FPCM sends faulty information to ECM after diagnosis the fuel pump motor, FPS and the system, including the self-diagnosis.
- The FPCM compares the actual fuel pressure measured by the FPS with the target fuel pressure provided by the ECM and controls the voltage provided to the low pressure fuel pump motor. The FPCM keeps regulating fuel flow rate by controlling the low pressure fuel pump, depending on engine speed (rpm) and vehicle loads.