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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 493 (Engine Control System (VK56VD) DTC/Circuit Diagnosis (4 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0506: ISC System >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD and 2019 Nissan NV2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 

    If DTC P0506 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 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 3.

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

    INSPECTION END

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