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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (4 Of 4) >> DTC/Circuit Diagnosis >> High Pressure Fuel Pump >> Component Function Check

Component Function Check

  1. CHECK HIGH PRESSURE FUEL PUMP FUNCTION 

    SYMBOL With CONSULT

    1. Start engine.
    2. Select "FUEL PRES SEN V" in "DATA MONITOR" mode of "ENGINE" using CONSULT and check the indication as per the following conditions.
      Monitor item Condition Indication
      FUEL PRES SEN V
      • Engine: After warming up
      • Selector lever: P or N position
      • A/C switch: OFF
      • No load
      Engine speed: Idle 0.73 - 1.0 V
      Revving engine up to 4, 000 rpm quickly. 1.0 - 2.9 V

    SYMBOL Without CONSULT

    1. Start engine.
    2. Check the voltage between ECM terminals as per the following conditions.
      ECM Condition Voltage
      Voltage + -
      Terminal
      F52 67 68 [Engine is running]
      • Warm-up condition
      • Idle speed
        NOTE: SYMBOL The pulse cycle changes depending on rpm at idle.
      3.1 V
      [Engine is running]
      • Warm-up condition
      • Engine speed: 2, 500 rpm
      4.3 V

    Is the inspection result normal?

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    INSPECTION END

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    Proceed to Diagnosis Procedure .