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Home >> Infiniti >> 2015 >> QX80 Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Trouble Codes (DTCS) P1551-P219B, Symptom Tests And R & I) >> DTC/Circuit Diagnosis >> Fuel Injector >> Component Function Check >> Diagnostic Test
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Diagnostic Test

  1. INSPECTION START

    Turn ignition switch to START.

    Are any cylinders ignited?

    YES 

    GO TO STEP 2  .

    NO 

    Proceed to DIAGNOSIS PROCEDURE .

  2. CHECK FUEL INJECTOR FUNCTION

    G-20 WITH CONSULT

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
    3. Check that each circuit produces a momentary engine speed drop.

    G-21 WITHOUT CONSULT

    1. Start engine.
    2. Listen to each fuel injector operating sound.
      Fig 1: Checking Fuel Injector Operating Sound
      G04812223Courtesy of NISSAN NORTH AMERICA, INC.
      Clicking sound should be heard.

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Proceed to DIAGNOSIS PROCEDURE .