KIA Niro: Fuel Pressure Sensor (FPS)

Description

Installed on top of the low pressure fuel pump, the Fuel Pressure Sensor (FPS) measures the pressure in the low pressure fuel line.

Based on the fuel pressure measured by the FPS and the amount of fuel consumed, the fuel pump
control module (FPCM) determines whether to activate the low pressure fuel pump. After activating
the low pressure fuel pump, the FPS continues to send the fuel pressure to the FPCM and the FPCM
keeps controlling the fuel flow rate using the feedback from the FPS.

Circuit Diagram

Circuit Diagram

Fail-Safe Mode

Fail-Safe Mode

Warning

Warning

If the fuel pressure sensor malfunctions, it enters fail safe mode. This means that the fuel pressure rises to match the increased level of current while the pressure in the low pressure fuel line remains static despite the rise in fuel pressure.

Terminal
Information

Terminal Illustration

Terminal Function

Terminal Function

Inspection

Inspection

  1. Connect the KDS on the Data Link Connector (DLC).
  2. Check that the output voltage is within the specification.

Fuel Pump Control Module (FPCM) Repair procedures

Fuel Pump Control Module (FPCM) Repair procedures

Removal

  1. Release the residual pressure in fuel line.

    (Refer to Fuel Delivery system - "Release Residual Pressure in Fuel Line")

  2. Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
  3. Remove the rear seat cushion.

    ( Refer to Body - "Rear Seat Assembly" )

  4. Remove the fuel pump service cover (A).

Warning

Warning

  • When reinstalling a protective cover for a fuel pump, remove the existing butyl tape and apply a new one.
  • Before assembling the protective cover, ensure that the temperature of the butyl is about 30º C using a hair dryer or a heat gun.

Warning

When installing the protective cover for the fuel pump, pay attention to the installation direction of the grommet and the protective cover.

  • The arrow (A) should be in the forward direction of the car.
  • Align the bulging part of the vehicle body (B) with the hole of the protective cover.
  • Align the bulging part of the grommet (C) with the bulging part of the protective cover.
  1. Disconnect the fuel pressure sensor connector (A).

  1. Remove the fuel pressure sensor fixing pin (A).
  2. Remove the fuel pressure sensor (B) from the fuel pump.

Installation

Installation

  1. Install in the reverse order of removal.

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