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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (5 Of 6)) >> DTC/Circuit Diagnosis >> DTC P21A1: Air Fuel Ratio >> DTC Confirmation Procedure

DTC Confirmation Procedure

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

    If DTC P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 or P21A3 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. PRECONDITIONING-1 

    If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    NOTE: Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

    GO TO 3.

  3. PRECONDITIONING-2 
    1. Turn ignition switch ON.
    2. Clear the mixture ratio self-learning value. Refer to Description .

    Will CONSULT be used?

    YES

    GO TO 4.

    NO

    GO TO 7.

  4. PERFORM DTC CONFIRMATION PROCEDURE-1 

    SYMBOL With CONSULT

    1. Turn ignition switch ON.
    2. On CONSULT screen, select "ENGINE" >> "DATA MONITOR" >> "COOLAN TEMP/S".
    3. Start engine.
    4. Check that "COOLAN TEMP/S" indicates more than 80 deg.C (176 deg.F).

    GO TO 5.

  5. PERFORM DTC CONFIRMATION PROCEDURE-2 

    SYMBOL With CONSULT

    1. On CONSULT screen, select the following items in "DATA MONITOR".
      • ENG SPEED
      • COOLAN TEMP/S
      • B/FUEL SCHDL
      • A/F IMBALNC DIAG-CPS STAT
      • A/F IMBLNC DIAG-CPS CMPLT
    2. Drive vehicle under the following conditions for at least 20 consecutive seconds.
      CAUTION:
      • Always drive vehicle at a safe speed.
      • This procedure must be performed by two or more persons.

      ENG SPEED

      1, 000-1, 400 rpm

      COOLAN TEMP/S

      More than 80 deg.C (176 deg.F)

      B/FUEL SCHDL

      3-6 msec

      Selector lever

      D position (A/T)

      A/F IMBALNC DIAG-CPS STAT

      PRSNT
      NOTE:
      • Keep the accelerator pedal as possible during cruising.
      • Drive the vehicle at approximately 88 km/h (55MPH) allows easy diagnosis.
    3. Check "A/F IMBLNC DIAG-CPS CMPLT" indication.

    Is "CMPLT" displayed?

    YES

    GO TO 6.

    NO

    GO TO 3.

  6. PERFORM DTC CONFIRMATION PROCEDURE-3 

    Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    NO

    Confirmation after repair: INSPECTION END

  7. PERFORM DTC CONFIRMATION PROCEDURE-4 

    SYMBOL With GST

    1. Start the engine and warm it up to normal operating temperature.
    2. Drive vehicle under the following conditions for at least 20 consecutive seconds.
      CAUTION:
      • Always drive vehicle at a safe speed.

      Engine speed

      1, 000-1, 400 rpm

      Calculated load value

      13-30%

      Selector lever

      D position (A/T)
      NOTE:
      • Keep the accelerator pedal as possible during crusing.
      • Drive the vehicle at approximately 88 km/h (55MPH) allows easy diagnosis.
    3. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Go to Diagnosis Procedure .

    NO

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    NO

    Confirmation after repair: INSPECTION END

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