Kia Niro: Fuel Delivery System / Fuel Pump Control Module (FPCM) Description and operation

Kia Niro 2017 (DE HEV) Service Manual / Engine Control/Fuel System / Fuel Delivery System / Fuel Pump Control Module (FPCM) Description and operation

Description

Installed on the right hand side of the fuel tank, the Fuel Pump Control Module (FPCM) controls the DC motor mounted inside the low pressure fuel pump.

The module compares instantaneous fuel pressure measured by the fuel pressure sensor (FPS) with target fuel pressure provided by the ECM and generates the desired target fuel pressure by controlling the fuel pump motor and regulating fuel flow rate in the low pressure fuel line between the low and high pressure fuel pumps.

Operation

1.

The ECM provides target fuel pressure to the FPCM via CAN.

2.

The FPS provides the FPCM with actual pressure of the low pressure fuel line between the low and high pressure fuel pumps, and the FPCM forwards this to the ECM. Also, the FPCM diagnoses faults in the FPCM, fuel pump motor and FPS and then provides the diagnostic information to the ECM.

3.

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 the fuel flow rate by controlling the low pressure fuel pump, depending on engine speed (rpm) and vehicle loads.

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