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Home >> Kia >> 2017 >> Cadenza Technology >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 6) >> DTC P0090-00: Fuel Pressure Regulator 1 Control Circuit/Open >> Component Inspection >> Check the Fuel Pressure Control Valve

Check the Fuel Pressure Control Valve

  1. Ignition "OFF".
  2. Connect VMI to KDS/GDS and select "Oscilloscope".
  3. Ignition "ON".
  4. Perform "ACTUATION TEST " for "Fuel Pressure Ragulator"
  5. Measure signal waveform between Pin No. 2 (High) terminal of FPCV and chassis ground with VMI.
  6. Measure signal waveform between Pin No. 1 (Low) terminal of FPCV and chassis ground with VMI.
    Fig 1: Screen Display - Fuel Pressure Ragulator Actuation Test
    G12284472Courtesy of KIA MOTORS AMERICA, INC.
  7. Does the RPS operate properly? (Check variation)

    YES 

    NO 



  1. Ignition "OFF".
  2. Connect VMI to KDS/GDS and select "Oscilloscope".
  3. Ignition "ON", Engine "ON"
  4. Measure signal waveform between Pin No. 2 (High) terminal of FPCV connector and chassis ground with VMI.
  5. Measure signal waveform between Pin No. 1 (Low) terminal of FPCV connector and chassis ground with VMI.
    Fig 1: Screen Display - Normal Waveforms Of FPCV At Engine Idle
    G12284473Courtesy of KIA MOTORS AMERICA, INC.
    Fig 2: Screen Display - Normal Waveforms Of FPCV At Approx. 2000RPM
    G12284474Courtesy of KIA MOTORS AMERICA, INC.
  6. Does the FPCV operate properly? (Check variation)

    YES 

    NO 

    • Carefully re-do this troubleshooting guide steps.
    • If no problems were found with the circuits or connectors, replace the FPCV and go to "VERIFICATION OF REPAIR " procedure.
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