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Home >> Infiniti >> 2021 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 5) >> Engine (ECM) >> DTC P0506: ISC System >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

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

    Is intake air leakage detected?

    YES

    Discover air leakage location and repair.

    NO

    GO TO 2.

  2. REPLACE ECM 
    1. Stop engine.
    2. Replace ECM.
    3. Perform additional service when replacing ECM. Refer to Work Procedure .

    INSPECTION END

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