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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 618 (Engine Control System (DTC/Circuit Diagnosis) (10 Of 17)) >> DTC/Circuit Diagnosis >> DTC P0506: ISC System >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. 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 confirmation procedure (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 LEAK 
    1. Start engine and let it idle.
    2. Listen for an intake air leak after the mass air flow sensor.

    Is intake air leak detected?

    YES

    Discover air leak location and repair.

    NO

    GO TO 3.

  3. REPLACE ECM 
    1. Stop the engine.
    2. Replace ECM. Refer to Removal and Installation .
    3. Proceed to Description .

    INSPECTION END

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