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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 523 (Automatic Transmission (Re7R01B) (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC P0729: 6GR Incorrect Ratio >> DTC Confirmation Procedure

DTC Confirmation Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD and 2019 Nissan NV2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • " Diagnosis Procedure " must be performed before starting "DTC CONFIRMATION PROCEDURE".
  • Never perform "DTC CONFIRMATION PROCEDURE" before completing the repair, which may cause secondary malfunction.
  • Always drive vehicle at a safe speed.
  1. PRECONDITIONING 

    If "DTC CONFIRMATION PROCEDURE" is previously conducted, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.

    GO TO 2.

  2. CHECK CLAMP CONNECTION 

    Check all clamp connections on the air duct from the air cleaner to throttle body.

    GO TO 3.

  3. CHECK ATF TEMPERATURE 

    SYMBOL With CONSULT

    1. Start the engine.
    2. Select "ATF TEMP 1" in "Data Monitor" in "TRANSMISSION".
    3. Check ATF temperature is in the following range.

      ATF TEMP 1

      : 20 deg.C (68 deg.F) - 140 deg.C (284 deg.F)

    SYMBOL With GST

    1. Start the engine.
    2. Drive vehicle for approximately 5 minutes in urban areas.

    Is ATF temperature within specified range?

    YES

    GO TO 4.

    NO

    Drive vehicle to warm ATF or stop engine to cool ATF.

  4. CHECK SYMPTOM (PART 1) 

    SYMBOL With CONSULT

    1. Select "6TH GR FNCTN P0729" in "DTC Work Support" in "TRANSMISSION".
    2. Drive vehicle with manual mode and maintain the following conditions.

      GEAR

      : 6th

      ACCELE POSI

      : 0.7/8 or more

      VEHICLE SPEED

      : 10 km/h (7 MPH) or more
    3. Keep the current driving status for 2 seconds or more if CONSULT screen changes from "OUT OF CONDITION" to "TESTING".
      CAUTION: When "TESTING" is not indicated on CONSULT for a long time, check "Self Diagnostic Results" in "TRANSMISSION". When a DTC other than "P0729" is detected, check the DTC.

      Refer to DTC Index .

    SYMBOL With GST

    1. Drive vehicle and maintain the following conditions for 2 seconds or more.

      Selector lever

      : "M" position

      Gear position

      : 6th

      Accelerator pedal opening

      : 0.7/8 or more

      Vehicle speed

      : 10 km/h (7 MPH) or more
    2. Check DTC.

    Is "OUT OF CONDITION", "STOP VEHICLE" or "COMPLETED RESULT NG" displayed? / Is "P0729" detected?

    YES

    Perform "Step 3" again.

    YES

    GO TO 5.

    YES

    Go to Diagnosis Procedure .

    YES

    Go to Diagnosis Procedure .

    NO

    GO TO 5.

  5. CHECK SYMPTOM (PART 2) 
    1. Stop vehicle.
    2. Drive vehicle in "D" position allowing it to shift from 1GR to 7GR and check shift timing and shift shock.

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

    INSPECTION END

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