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Home >> Infiniti >> 2013 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0171 To P0463 >> DTC P0191: FRP Sensor >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0191 Fuel rail pressure sensor Fuel rail pressure remains at more than 14.5 MPa (147.9 kg/cm2 , 2102.5 psi) for 0.2 seconds or more during ignition ON.
  • Harness or connectors

    (Fuel rail pressure sensor circuit is open or shorted.)

    (Power steering pressure sensor circuit is open or shorted.)

    (Low fuel pressure sensor circuit is open or shorted.)

    (The electrically-controlled cooling fan coupling circuit is open or shorted)

  • Fuel rail pressure sensor
  • Power steering pressure sensor
  • Low fuel pressure sensor
  • Electrically-controlled cooling fan coupling