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Home >> Infiniti >> 2011 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1225 Through P2A03 >> DTC P2539, P2541, P2542: Low Fuel Pressure Sensor >> Component Inspection

Component Inspection

  1. CHECK LOW FUEL PRESSURE SENSOR

    WITH CONSULT-III

    1. Turn ignition switch OFF.
    2. Reconnect harness connector disconnected.
    3. Start the engine.
    4. Select "DATA MONITOR" mode with CONSULT-III.
    5. Check that the "L/FUEL PRES SEN V" value.
      DATA MONITOR ITEM CONDITION

      Data monitor item Condition Value (Approx.)
      L/FUEL PRES SEN V Engine speed: idle 3, 000 -3, 300 mV
      Engine speed: 3, 000 RPM (no load)

    WITHOUT CONSULT-III

    1. Turn ignition switch OFF.
    2. Reconnect harness connector disconnected.
    3. Start the engine.
    4. Check low fuel pressure sensor signal voltage.
      VOLTAGE SPECIFICATION

      + - Condition Value (Approx.)
      Low fuel pressure sensor Ground
      Connector Terminal
      F25 2 Ground [Engine is running]
      • Warm-up condition
      • Idle speed
      G07020502Courtesy of NISSAN MOTOR CO., U.S.A.
      [Engine is running]
      • Warm-up condition
      • Engine speed: 2, 000 RPM
      G07020503Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: INSPECTION END.

      NO: Replace low fuel pressure sensor. Refer to "REMOVAL AND INSTALLATION ".