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Home >> Kia >> 2019 >> Optima EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.4L (1 Of 6) (Except HEV) >> DTC P0091-00: Fuel Pressure Regulator 1 Control Circuit Low >> Wiring Inspection >> Control Circuit Inspection >> Control (Low) Circuit Inspection

Control (Low) Circuit Inspection

  1. Ignition "OFF".
  2. Disconnect Battery (-) terminal.
  3. Refer to "FUEL PRESSURE REGULATOR and ENGINE CONTROL MODULE (ECM) " and disconnect Fuel Pressure Regulator and PCM connector.
  4. Measure resistance between Pin No. 1 (Low) terminal of Fuel Pressure Regulator harness connector and Pin No. 90 (Low) terminal of ECM/PCM harness connector.

    Specification:  Approx. below 1 Ω

  5. Is the measured value within specification?

    YES 

    NO 

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