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Home >> Infiniti >> 2019 >> QX50 Essential, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (12 Of 12) >> DTC/Circuit Diagnosis >> High Pressure Fuel Pump >> Component Function Check
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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: 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?

    YES

    INSPECTION END

    NO

    Proceed to Diagnosis Procedure .