Description And Operation: Operation
- The ECM sends target fuel pressure to the FPCM via CAN network.
- The FPS sends the actual pressure of the low pressure fuel line between the low and high pressure fuel pumps to the FPCM, and the FPCM forwards this to the ECM. Also, the FPCM diagnoses faults in the FPCM, fuel pump motor and FPS and then sends the diagnostic information to the ECM.
- 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.