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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Engine Control System (DTCS) (5.6L) (3 Of 8)) >> DTC/Circuit Diagnosis >> U0284 Active Grille Shutter >> Diagnosis Procedure

Diagnosis Procedure

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

    If DTC U0284 is displayed with another DTC UXXXX, first perform the confirmation procedure (trouble diagnosis) for DTC UXXXX.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Index

    NO

    GO TO 2 .

  2. CHECK ACTIVE GRILLE SHUTTER POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect active grille shutter harness connector.
    3. Check the voltage between active grille shutter harness connector and ground as follows.

      +

      -

      Condition

      Voltage

      (Approx.)

      Active grille shutter

      Connector

      Terminal

      E8

      1

      Ground

      Ignition switch: ON

      Battery voltage

      Ignition switch: OFF

      0 V

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    GO TO 3 .

  3. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Pull out 20A fuse (No. 56) from IPDM E/R.
    3. Check that 20A fuse is not blowing.

    Is the fuse blown (open)?

    YES

    Replace the fuse after repairing the applicable circuit.

    NO

    GO TO 4 .

  4. CHECK ACTIVE GRILLE SHUTTER POWER SUPPLY CIRCUIT 
    1. Disconnect IPDM E/R harness connector.
    2. Check the continuity between IPDM E/R harness connector and active grille shutter harness connector.

      IPDM E/R

      Active grille shutter

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E121

      25

      E8

      1

      Existed
    3. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for power supply circuit.

    NO

    Repair or replace the error-detected parts.

  5. CHECK ACTIVE GRILLE SHUTTER GROUND CIRCUIT 
    1. Turn ignition switch OFF
    2. Check the continuity between active grille shutter harness connector and ground.

      Active grille shutter

      -

      Continuity

      Connector

      Terminal

      E8

      4

      Ground

      Existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 6 .

    NO

    Repair or replace the error-detected parts.

  6. CHECK ACTIVE GRILLE SHUTTER INPUT SIGNAL CIRCUIT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and active grille shutter harness connector.

    ECM

    Active grille shutter

    Continuity

    Connector

    Terminal

    Connector

    Terminal

    F79

    86

    E8

    3

    Existed

    Is the inspection result normal?

    YES

    GO TO 7 .

    NO

    Repair or replace the error-detected parts.

  7. CHECK ACTIVE GRILLE SHUTTER 

    Check active grille shutter. Refer to Component Inspection (Active Grille Shutter) .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace active grille shutter. Refer to Removal and Installation .

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