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Home >> Infiniti >> 2019 >> QX50 Pure, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (6 Of 12) >> DTC/Circuit Diagnosis >> DTC P0507: ISC System >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK DTC PRIORITY 

    If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Index .

    NO

    GO TO 2.

  2. CHECK PCV HOSE CONNECTION 

    Confirm that PCV hose is connected correctly.

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace error-detected parts.

  3. CHECK INTAKE AIR LEAK 
    1. Start the engine and let it idle.
    2. Listen for an intake air leak after the mass air flow sensor.

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. REPLACE ECM 
    1. Stop the engine.
    2. Replace ECM. Refer to Removal and Installation .

    INSPECTION END

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