2012 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Component Function Check

  1. PERFORM COMPONENT FUNCTION CHECK-I
    WARNING: Never remove the reservoir tank cap when the engine is hot. Serious burns could be caused by high pressure fluid escaping from the radiator.
    Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up pressure to escape. Then turn the cap all the way off.

    Check the coolant level in the reservoir tank and radiator.

    Allow engine to cool before checking coolant level. 

    Fig 1: Identifying Coolant Level In Reservoir Tank
    G08260241Courtesy of NISSAN NORTH AMERICA, INC.

    Is the coolant level in the reservoir tank and/or radiator below the proper range? 

    YES: Proceed to "DIAGNOSIS PROCEDURE ".

    NO: GO TO 2.

  2. PERFORM COMPONENT FUNCTION CHECK-I

    Confirm whether customer filled the coolant or not.

    Did customer fill the coolant? 

    YES: Proceed to "DIAGNOSIS PROCEDURE ".

    NO: GO TO 3.

  3. PERFORM COMPONENT FUNCTION CHECK-III

    WITH CONSULT

    1. Start the engine.
    2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode with CONSULT.
    3. Check that cooling fan speed varies according to the percentage.
      NOTE: Fan speed changes as the percentage changes.

    WITHOUT CONSULT

    1. Start the engine.
    2. Perform IPDM E/R auto active test. Refer to "DIAGNOSIS DESCRIPTION ".
    3. Check that cooling fan speed increase.
      NOTE: Speed changes gradually when performing the auto active test.

    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.