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Home >> Hyundai >> 2021 >> Ioniq Plug-In Hybrid Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (PHEV) (1 Of 3) >> DTC P0090: Fuel Pressure Regulator 1 Control Circuit/Open >> Wiring Inspection >> Control Circuit Inspection
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Control Circuit Inspection

  1. IG "OFF" & Disconnect FPR connector.
  2. IG "ON" & ENG "OFF".
  3. Measure the voltage between FPR open, FPR close terminal of FPR harness connector and chassis ground.

    Specification  :

    FPR (+) Terminal: Approx. 4.5V

    FPR (-) Terminal: Approx. 0~0.5V

  4. Is the measured voltage within specification?

    YES 

    NO