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High Temperature Adjustment [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. ADJUST HYBRID TRANSAXLE FLUID LEVEL AT HIGH TEMPERATURE 
    1. Remove the No. 2 engine under cover assembly.

      Refer to PROCEDURE - Step 1

    2. Remove the front fender apron seal LH.

      Refer to PROCEDURE - Step 11

    3. Check the hybrid transaxle fluid temperature.
      1. Turn the ignition switch to ON (READY) and turn the GTS on.
        NOTE:

        To reduce load, make sure that all electrical systems, such as the air conditioning, lighting system, electric fan and audio system are off.

      2. Put the engine in inspection mode.

        Refer to INSPECTION MODE PROCEDURE [09/2023 - ]

      3. Enter the following menus: Powertrain / Transmission / Data List / Engine Speed and A/T Oil Temperature No. 1.

        Powertrain > Transmission > Data List 

        Tester Display
        Engine Speed
        A/T Oil Temperature No. 1
        NOTE:
        • If the hybrid transaxle fluid temperature tends to decrease when the hybrid transaxle fluid temperature is between 75 °C (167 °F) and 80 °C (176 °F) with the engine idling, make sure that hybrid transaxle fluid temperature is above 80 °C (176 °F) before starting work.
        • If the hybrid transaxle fluid temperature tends to increase when the hybrid transaxle fluid temperature is between 75 °C (167 °F) and 80 °C (176 °F) with the engine idling, make sure that hybrid transaxle fluid temperature is below 75 °C (167 °F) before starting work.
        • If the hybrid transaxle fluid temperature tends not to change when the hybrid transaxle fluid temperature is between 75 °C (167 °F) and 80 °C (176 °F) with the engine idling, make sure that hybrid transaxle fluid temperature is 77.5 °C (172 °F) before starting work.
    4. Depress and hold the brake pedal.
    5. Slowly move the shift lever from P to D, and then back to P.

      HINT: 

      • Slowly move the shift lever to circulate the hybrid transaxle fluid through each part of the transaxle assembly with motor and inverter.
      • Keep the shift lever in each position for approximately 3 seconds.
    6. Lift the vehicle.
      NOTE:

      Set the vehicle on a lift so that the vehicle is kept level when it is lifted up (make sure the tilt angle from the front to rear and side to side of the vehicle is within +/- 1°).

    7. Remove the refill plug and gasket from the automatic transaxle case sub-assembly.
      GTY1194801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Install SST (filler plug adapter) to the refill plug hole.
      GTY1194150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Filler Plug Adapter)
      • SST: 09993-19025 
        1. 09993-10010
        2. 09993-01030
    9. Connect SST (vacuum regulator) to SST (filler plug adapter).
      GTY1202144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Vacuum Regulator)
      • SST: 09993-19025 
        1. 09993-10010
        2. 09993-01020
    10. Connect the hose of SST (tank assy) to SST (vacuum regulator).
      GTY687449Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Vacuum Regulator)
      *b SST (Tank Assy)
      *c Hose of SST (Tank Assy)
      *d Valve Handle (Upper Valve)
      *e Valve Handle (Lower Valve)
      • SST: 09993-19025 
        1. 09993-20010
      NOTE:

      Ensure both of the valves of SST (tank assy) are closed by turning the valve handle (upper valve) and valve handle (lower valve) to the position shown in the illustration so they are perpendicular to the hoses.

    11. Connect a compressed air hose to SST (tank assy).
      NOTE:

      Do not apply 689 kPa (7.0 kgf/cm2 , 100 psi) or more of compressed air to SST (tank assy).

    12. Open the lower valve of SST (tank assy) by turning the valve handle (lower valve) so it is in-line with the compressed air hose.
      GTY660372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. Open the upper valve of SST (tank assy) by turning the valve handle (upper valve) so it is in-line with the hose of SST (tank assy).
      GTY480016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      GTY701311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • Make sure to turn the valve handle (upper valve) slowly.
      • Make sure the value on the gauge of SST (vacuum regulator) stays between -10 and -20 kPa (-0.1 and -0.2 kgf/cm2 , -1.5 and -2.9 psi).
      • If the value on the gauge of SST (vacuum regulator) exceeds -20 kPa (-0.2 kgf/cm2 , -2.9 psi), make sure to turn the valve handle (upper valve) so it is perpendicular to the hose of SST (tank assy) immediately, otherwise parts inside the transaxle assembly with motor and inverter may be damaged.

      HINT: 

      Vacuum will be applied to the transaxle assembly with motor and inverter when both of the valves of SST (tank assy) are opened to prevent hybrid transaxle fluid loss when removing/installing the overflow plug.

    14. Using a 10 mm hexagon socket wrench, remove the overflow plug and gasket from the transaxle housing.
      GTY1200496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:

      A small amount of hot hybrid transaxle fluid may leak from the overflow plug port during removal.

      HINT: 

      Place a container under the overflow plug to collect any hybrid transaxle fluid that leaks out.

    15. Install SST (adapter 18) to SST (overflow level gauge) and then install SST (overflow level gauge) to the overflow plug hole by hand until it is fully seated against the transaxle housing.
      GTY1196704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a SST (Adapter 18)
      *b SST (Overflow Level Gauge)
      • SST: 09993-01100 
      • SST: 09993-19025 
        1. 09993-10010
        2. 09993-01010
      NOTE:

      Ensure that the sliding tube of SST (overflow level gauge) is fully retracted into the housing of SST (overflow lever gauge) before inserting it into the overflow plug hole.

      HINT: 

      The level/measurement indicator on SST (overflow level gauge) will read 0 mm (0 in.) when the sliding tube of SST (overflow level gauge) is fully retracted.

    16. Adjust SST (overflow level gauge) to the specified measurement according to the table below and lock the sliding scale of SST (overflow level gauge) by tightening the thumb screw.

      Specified Measurement

      Specified Measurement at Hybrid Transaxle Fluid Temperature of 75 to 80 °C (167 to 176 °F)
      Engine Idle Speed (rpm) 950 to 1050 97.1 mm (3.82 in.)
      NOTE:

      Before proceeding with the inspection, make sure the hybrid transaxle fluid temperature is between 75 to 80 °C (167 to 176 °F) and the engine idle speed is within the specified range in the table above.

    17. Close the upper valve of SST (tank assy) by turning the valve handle (upper valve) so it is perpendicular to the hose of SST (tank assy).
      GTY480014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Make sure to turn the valve handle (upper valve) slowly.
      • Make sure that the gauge of SST (vacuum regulator) reads 0 kPa (0 kgf/cm2 , 0 psi).

      HINT: 

      Vacuum that was applied to the transaxle assembly with motor and inverter will not be applied when the valve handle (upper valve) is closed.

    18. Check the hybrid transaxle fluid flowing from the hose at the bottom of SST (overflow level gauge).
      • If the amount of hybrid transaxle fluid that comes out of SST (overflow level gauge) is large, proceed to step [#1].
      • If no hybrid transaxle fluid comes out of SST (overflow level gauge), proceed to step [#2].
    19. If the amount of hybrid transaxle fluid that comes out of SST (overflow level gauge) is large. [#1]
      1. Wait until the hybrid transaxle fluid flow slows and only drips come out.
        GTY1200480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        The hybrid transaxle fluid flow will not stop completely because the hybrid transaxle fluid continues to expand as its temperature increases.

      2. Open the upper valve of SST (tank assy) by turning the valve handle (upper valve) so it is in-line with the hose of SST (tank assy).
        GTY480016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        GTY701311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Make sure to turn the valve handle (upper valve) slowly.
        • Make sure the value on the gauge of SST (vacuum regulator) stays between -10 and -20 kPa (-0.1 and -0.2 kgf/cm2 , -1.5 and -2.9 psi).
        • If the value on the gauge of SST (vacuum regulator) exceeds -20 kPa (-0.2 kgf/cm2 , -2.9 psi), make sure to turn the valve handle (upper valve) so it is perpendicular to the hose of SST (tank assy) immediately, otherwise parts inside the transaxle assembly with motor and inverter may be damaged.

        HINT: 

        Vacuum will be applied to the transaxle assembly with motor and inverter when both of the valves of SST (tank assy) are opened to prevent hybrid transaxle fluid loss when removing/installing the overflow plug.

      3. Remove SST (overflow level gauge) from the overflow plug hole.
      4. Using a 10 mm hexagon socket wrench, install the overflow plug and a new gasket to the transaxle housing.

        Torque: 50 N.m (510 kgf/cm, 37 ft.lbf) 

        NOTE:

        To prevent the gasket from being deformed when tightening, coat it with Toyota Genuine ATF WS.

      5. Close the upper valve of SST (tank assy) by turning the valve handle (upper valve) so it is perpendicular to the hose of SST (tank assy).
        GTY480014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • Make sure to turn the valve handle (upper valve) slowly.
        • Make sure that the gauge of SST (vacuum regulator) reads 0 kPa (0 kgf/cm2 , 0 psi).

        HINT: 

        Vacuum that was applied to the transaxle assembly with motor and inverter will not be applied when the valve handle (upper valve) is closed.

      6. Close the lower valve of SST (tank assy) by turning the valve handle (lower valve) so it is perpendicular to the compressed air hose.
        GTY722585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Disconnect the compressed air hose from SST (tank assy).
      8. Disconnect the hose of SST (tank assy) from SST (vacuum regulator).
      9. Disconnect SST (vacuum regulator) from SST (filler plug adapter).
      10. Remove SST (filler plug adapter) from the refill plug hole.
    20. If no hybrid transaxle fluid comes out of SST (overflow level gauge). [#2]
      1. Remove SST (filler plug adapter) from the refill plug hole.
        GTY1194150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Filler Plug Adapter)
      2. Add hybrid transaxle fluid through the refill plug hole until hybrid transaxle fluid comes out of SST (overflow level gauge).
        GTY1196193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Overflow Level Gauge) - -
        NOTE:

        Use Toyota Genuine ATF WS.

        Using hybrid transaxle fluid other than the above type may cause abnormal noise or vibration, or ultimately damage the transaxle of the vehicle.

      3. Wait until the hybrid transaxle fluid flow slows and only drips come out.
        GTY1200480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        The hybrid transaxle fluid flow will not stop completely because the hybrid transaxle fluid continues to expand as its temperature increases.

      4. Install SST (filler plug adapter) to the refill plug hole.
        GTY1194150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a SST (Filler Plug Adapter)
        • SST: 09993-19025 
          1. 09993-10010
          2. 09993-01030
      5. Open the upper valve of SST (tank assy) by turning the valve handle (upper valve) so it is in-line with the hose of SST (tank assy).
        GTY480016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        GTY701311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • Make sure to turn the valve handle (upper valve) slowly.
        • Make sure the value on the gauge of SST (vacuum regulator) stays between -10 and -20 kPa (-0.1 and -0.2 kgf/cm2 , -1.5 and -2.9 psi).
        • If the value on the gauge of SST (vacuum regulator) exceeds -20 kPa (-0.2 kgf/cm2 , -2.9 psi), make sure to turn the valve handle (upper valve) so it is perpendicular to the hose of SST (tank assy) immediately, otherwise parts inside the transaxle assembly with motor and inverter may be damaged.

        HINT: 

        Vacuum will be applied to the transaxle assembly with motor and inverter when both of the valves of SST (tank assy) are opened to prevent hybrid transaxle fluid loss when removing/installing the overflow plug.

      6. Remove SST (overflow level gauge) from the overflow plug hole.
      7. Using a 10 mm hexagon socket wrench, install the overflow plug and a new gasket to the transaxle housing.

        Torque: 50 N.m (510 kgf/cm, 37 ft.lbf) 

        NOTE:

        To prevent the gasket from being deformed when tightening, coat it with Toyota Genuine ATF WS.

      8. Close the upper valve of SST (tank assy) by turning the valve handle (upper valve) so it is perpendicular to the hose of SST (tank assy).
        GTY480014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • Make sure to turn the valve handle (upper valve) slowly.
        • Make sure that the gauge of SST (vacuum regulator) reads 0 kPa (0 kgf/cm2 , 0 psi).

        HINT: 

        Vacuum that was applied to the transaxle assembly with motor and inverter will not be applied when the valve handle (upper valve) is closed.

      9. Close the lower valve of SST (tank assy) by turning the valve handle (lower valve) so it is perpendicular to the compressed air hose.
        GTY722585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      10. Disconnect the compressed air hose from SST (tank assy).
      11. Disconnect the hose of SST (tank assy) from SST (vacuum regulator).
      12. Disconnect SST (vacuum regulator) from SST (filler plug adapter).
      13. Remove SST (filler plug adapter) from the refill plug hole.
    21. Install the refill plug and a new gasket to the automatic transaxle case sub-assembly.

      Torque: 47 N.m (479 kgf/cm, 35 ft.lbf) 

      NOTE:

      To prevent the gasket from being deformed when tightening, coat it with Toyota Genuine ATF WS.

    22. Lower the vehicle.
    23. Turn the ignition switch off.
  2. REBUILD WORK 

    See step  9

  3. WSC DETERIORATION ESTIMATE UPDATE 
    NOTE:
    • If the transaxle fluid was replaced, perform WSC Deterioration Estimate Update.
    • If approximately 50% or more of the total transaxle fluid amount was replaced due to performing repairs, etc. on the transaxle, perform WSC Deterioration Estimate Update.

      Refer to INITIALIZATION [09/2023 - ]

  4. ATF THERMAL DEGRADATION ESTIMATE RESET 
    NOTE:
    • If the transaxle fluid was replaced, perform ATF Thermal Degradation Estimate Reset.
    • Approximately 50% or more of the transaxle fluid has been replaced during a repair of the transaxle or a similar operation.
    • If 50000 or more is displayed for the Data List item "ATF Thermal Degradation Estimate", thermal degradation of the transaxle fluid is suspected. Perform ATF Thermal Degradation Estimate Reset after replacing the transaxle fluid.

      Refer to INITIALIZATION [09/2023 - ]

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