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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (4 Of 6)) >> DTC/Circuit Diagnosis >> DTC P050B: Cold Start Control >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC PRIORITY 

    If DTC P050A, P050B or P050E 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. PERFORM IDLE AIR VOLUME LEARNING 

    Perform Description .

    Is Idle Air Volume Learning carried out successfully?

    YES

    GO TO 3.

    NO

    Follow the instruction of Idle Air Volume Learning.

  3. CHECK Intake system 

    Check for the cause of intake air volume lacking. Refer to the following.

    • Crushed intake air passage
    • Intake air passage clogging
    • Clogging of throttle body

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace malfunctioning part

  4. CHECK FUEL INJECTION SYSTEM FUNCTION 

    Perform DTC Confirmation Procedure for DTC P0171, P0174. Refer to DTC Description .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Go to Diagnosis Procedure for DTC P0171, P0174.

  5. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Turn ignition switch ON.
    2. Erase DTC.
    3. Perform DTC Confirmation Procedure.

      See DTC Description .

    Is the 1st trip DTC P050A, P050B or P050E displayed again?

    YES

    GO TO 6.

    NO

    INSPECTION END

  6. REPLACE ECM 
    1. Replace ECM.
    2. Go to Removal and Installation .

    INSPECTION END

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