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Home >> Lexus >> 2019 >> NX 300 Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission (U661E) - Diagnostics - Introduction (1 Of 2)) >> Automatic Transaxle System >> Initialization [10/2014 - ] >> Initialization [10/2014 - ]

Initialization [10/2014 - ]

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  1. RESET TRANSAXLE COMPENSATION CODE 
    NOTE:
    • If the following parts have been replaced, initialize the ECM and perform the following "Reset Memory" and "Perform Road Test to Allow ECM to learn" steps.

      - Valve body assembly

      - Shift solenoid valve SL3

      - Shift solenoid valve SL4

      - ECM

    • The transaxle compensation code can only be initialized with the Techstream.

    HINT: 

    The ECM memorizes the vehicle conditions when the ECT controls the automatic transaxle assembly. Therefore, when the automatic transaxle assembly or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information. The reset procedure is as follows:

    1. Move the shift lever to N or P.
    2. Turn the engine switch off.
    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG).
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Transmission / Utility / A/T Code Reset.

      Powertrain > Transmission > Utility 

      Tester Display
      A/T Code Reset
    7. Press "Next" again to proceed.
      NOTE:

      After the transaxle compensation code is initialized, perform the following "Reset Memory" and "Perform Road Test to Allow ECM to learn" steps.

    8. Press "Exit".
  2. PERFORM ROAD TEST TO ALLOW ECM TO LEARN 
    NOTE:

    Perform the following procedure while strictly observing all traffic laws and speed limits.

    1. Warm up the engine.
    2. Turn the engine switch off.
    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG).
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain / Engine / Data List / Throttle Sensor Position.

      Powertrain > Engine > Data List 

      Tester Display
      Throttle Sensor Position
    7. From a standstill, achieve highest possible speed with the accelerator pedal opened 15% or less. Keep the accelerator pedal angle steady while driving the vehicle.

      HINT: 

      "Throttle Sensor Position": 15% or less

    8. Repeat the previous step until shift shock no longer occurs.
    9. From a standstill, achieve highest possible speed with the accelerator pedal opened 25% to 35%. Keep the accelerator pedal angle steady while driving the vehicle.

      HINT: 

      "Throttle Sensor Position": 25% to 35%

    10. Repeat the previous step until shift shock no longer occurs.
  3. RESET MEMORY 
    NOTE:

    Reset Memory can be performed only with the Techstream.

    HINT: 

    The ECM (ECT) memorizes the vehicle conditions when controlling the automatic transaxle assembly and engine assembly.

    Therefore, when the automatic transaxle assembly, valve body assembly, shift solenoid valve SL3, shift solenoid valve SL4, or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information. The reset procedure is as follows:

    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: "Powertrain / Transmission / Utility / Reset Memory". Then, press "Next".

      Powertrain > Transmission > Utility 

      Tester Display
      Reset Memory
      NOTE:

      After performing Reset Memory, be sure to perform "Perform Road Test to Allow ECM to Learn" described earlier.

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