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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Transmission >> Automatic Transaxle >> DTC/Circuit Diagnosis >> DTC P0734: 4GR Incorrect Ratio >> DTC Logic >> DTC Confirmation Procedure

DTC Confirmation Procedure

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 ATF TEMPERATURE

    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°C (68°F) - 140°C (284°F)

    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 3.

      NO: Drive vehicle to warm ATF or stop engine to cool ATF.

  3. CHECK SYMPTOM (PART 1)

    With CONSULT 

    1. Select "4TH GR FNCTN P0734" in "DTC & SRT confirmation" in "TRANSMISSION".
    2. Drive vehicle with manual mode and maintain the following conditions:

      GEAR: 4th

      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 "P0734" is detected, check the DTC. Refer to "DTC INDEX ".

    With GST 

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

      Selector lever: "M" position

      Gear position: 4th

      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 "P0734" detected? 

      YES-1 (OUT OF CONDITION): Perform "Step 3" again.

      YES-2 (STOP VEHICLE): GO TO 4.

      YES-3 (COMPLETED RESULT NG): Go to "DIAGNOSIS PROCEDURE ".

      YES-4 ("P0734" is detected): Go to "DIAGNOSIS PROCEDURE ".

      NO: GO TO 4.

  4. 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.

      : INSPECTION END