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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Engine Control System (DTC/Circuit Diagnosis) (1 Of 5)) >> DTC/Circuit Diagnosis >> DTC P0021: IVT Control >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 

    If DTC P0011 or P0021 is displayed with DTC P0075 or P0081, first perform the trouble diagnosis for DTC P0075 or P0081.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable.

    NO

    GO TO 2.

  2. CHECK OIL PRESSURE WARNING LAMP 
    1. Start engine.
    2. Check oil pressure warning lamp and confirm it is not illuminated.
      G04073790Courtesy of NISSAN NORTH AMERICA, INC.

    Is oil pressure warming lamp illuminated?

    YES

    Check the engine oil level. Refer to Inspection .

    NO

    GO TO 3.

  3. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE 

    Check intake valve timing control solenoid valve. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Replace malfunctioning intake valve timing control solenoid valve. Refer to Exploded View .

  4. CHECK CRANKSHAFT POSITION SENSOR (POS) 

    Check crankshaft position sensor (POS). Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Replace crankshaft position sensor (POS). Refer to Exploded View .

  5. CHECK CAMSHAFT POSITION SENSOR (PHASE) 

    Check camshaft position sensor (PHASE). Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Replace malfunctioning camshaft position sensor (PHASE). Refer to Exploded View .

  6. CHECK CAMSHAFT (INTAKE) 

    Check the following.

    • Accumulation of debris on the signal plate of camshaft rear end
      GNSJMBIA0058Z-058Courtesy of NISSAN NORTH AMERICA, INC.
    • Chipping signal plate of camshaft rear end

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to Removal and Installation .

  7. CHECK TIMING CHAIN INSTALLATION 

    Check service records for any recent repairs that may cause timing chain misalignment.

    Are there any service records that may cause timing chain misalignment?

    YES

    Check timing chain installation. Refer to Removal and Installation .

    NO

    GO TO 8.

  8. CHECK LUBRICATION CIRCUIT 

    Check lubrication circuit. Refer to Inspection .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Clean lubrication line.