2012 Infiniti QX56 RWDFACTORY OEM SERVICE PROCEDURE

Component Function Check

  1. CHECK HIGH PRESSURE FUEL PUMP FUNCTION

    WITH CONSULT

    1. Start engine.
    2. Check "FUEL PRES SEN V" in "DATA MONITOR" mode with CONSULT.
      Monitor Item Condition Values/Status
      FUEL PRES SEN V Engine speed: Idle 820 - 1, 220 mV
      Engine speed: Revving engine from idle to 4, 000 rpm quickly 820 - 3, 060 mV

    WITHOUT CONSULT

    1. Start engine.
    2. Check the voltage between ECM harness connector and ground.
      ECM Condition Voltage
      + -
      Connector Terminal Connector Terminal
      F110 105 E80 175 [Engine is running]
      • Warm-up condition
      • Idle speed
      NOTE: The pulse cycle changes depending on rpm at idle
      		 BATTERY VOLTAGE (11 - 14 V)(1)
      G08257135Courtesy of NISSAN NORTH AMERICA, INC.
      [Engine is running]
      • Warm-up condition
      • Engine speed: 2, 000 rpm
      		 BATTERY VOLTAGE (11 - 14 V)(1)
      G08257136Courtesy of NISSAN NORTH AMERICA, INC.
      (1) Under the following conditions
      • A/C switch: OFF
      • Electric load: OFF (Lights, heater fan&rear window defogger)
      • Steering wheel: Kept in straight-ahead position

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Proceed to "DIAGNOSIS PROCEDURE ".

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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