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Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2 Of 2) >> Component /Circuit Diagnosis >> Engine Over Temperature >> Component Function Check
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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.

    GNSDB106470Courtesy of NISSAN NORTH AMERICA, INC.

    Allow engine to cool before checking coolant level.

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

    YES>>

    Refer to DTC Diagnosis Procedure .

    NO>>

    GO TO 2.

  2. PERFORM COMPONENT FUNCTION CHECK-II 

    Confirm whether customer filled the coolant or not.

    Did customer fill the coolant?

    YES>>

    Refer to DTC Diagnosis Procedure .

    NO>>

    GO TO 3.

  3. PERFORM COMPONENT FUNCTION CHECK-III SYMBOL
    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.

    SYMBOL 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>>

    Refer to DTC Diagnosis Procedure .