Fuel Pump Control Module (FPCM) Description and Operation

Description

The Fuel Pump Control Module (FPCM) is installed on the right side of the fuel tank on the upper fuel pump plate and controls the DC motor installed inside the low-pressure fuel pump. The module compares the instantaneous fuel pressure information measured by the Fuel Pressure Sensor (FPS) with the target fuel pressure information provided by the ECM, and generates the desired target fuel pressure by controlling the fuel pump motor and adjusting the fuel supply speed in the low-pressure fuel line between the low-pressure and high-pressure fuel pumps.

Operation

1. 1
   The ECM transmits the target fuel pressure information to the FPCM via the CAN network.
2. 2
   The FPS provides the FPCM with information on the actual fuel pressure in the low-pressure fuel line between the low-pressure and high-pressure fuel pumps, and the FPCM transmits this information to the ECM. In addition, the FPCM diagnoses malfunctions in the FPCM, fuel pump motor and FPS, and then provides diagnostic information to the ECM.
3. 3
   The FPCM compares the actual fuel pressure information measured by the FPS with the target fuel pressure information provided by the engine control module, and adjusts the voltage supplied to the low-pressure fuel pump motor. The FPCM continues to control the fuel flow by controlling the low-pressure fuel pump depending on engine speed (rpm) and vehicle load.