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Removal [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. PRECAUTION 

    Refer to PRECAUTION [09/2023 - ]

  2. PERFORM RESOLVER LEARNING 
    NOTE:
    • The resolver learned values cannot be initialized by disconnecting the cable from the negative (-) auxiliary battery terminal or removing a fuse.
    • If resolver learning is not performed after the part related has been replaced, the following DTCs may be stored and the symptoms may occur:
      • DTC output
        1. P1C5D19 (Drive Motor "A" Inverter Circuit Current Above Threshold)
        2. P0C7917 (Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Above Threshold)
        3. P0BFF1D (Drive Motor "A" Circuit Current Out of Range)
        4. P0C1900 (Drive Motor "A" Execution Torque Performance)
      • Slight vibration at a vehicle speed of 5 km/h (3 mph) or less
      • Shock or vibration during acceleration
    HINT: 
    • After replacing the hybrid motor control inverter assembly, write the stored resolver compensation value.
    • If the "read compensation value" cannot be performed, the resolver compensation value on the QR code label of the transaxle with motor assembly will need to be checked.
    1. Store resolver compensation value (if the "read compensation value" can be performed)
      1. Turn the ignition switch off and wait for 2 minutes or more.
      2. Check that the air conditioning system and power outlet socket are turned off.
      3. Enter the following menus.

        Powertrain > Motor Generator > Utility 

        Tester Display
        Front Resolver Correction Value Registration
      4. Select "Save Correction Value" and read the resolver compensation value.
      5. Turn the ignition switch off.
    2. Check resolver compensation value on QR code label (if the "read compensation value" cannot be performed)
      1. Remove the inverter water pump assembly.

        Refer to REMOVAL [09/2023 - ]

      2. Remove the HV water pump bracket.

        See step  15

      3. Check the resolver compensation value on the QR code label of the transaxle with motor assembly.
        GTY1132193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a QR Code Label
        *b Resolver Compensation Value
  3. REMOVE EV CONVERTER ASSEMBLY 

    Refer to REMOVAL [09/2023 - ]

  4. SUPPORT ENGINE WITH TRANSAXLE ASSEMBLY WITH MOTOR AND INVERTER 
    1. GTY1201990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Area that can touch the ground - -
      1. Using a transmission jack or equivalent tools, support the transaxle assembly with motor and inverter and engine assembly as shown in the illustration.
        NOTE:

        Do not apply any load outside of the area that can touch the ground.

  5. REMOVE ENGINE MOUNTING STAY LH 
    1. GTY1201347Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE ENGINE MOUNTING INSULATOR SUB-ASSEMBLY LH 
    1. GTY1201348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE UPPER INVERTER COVER 
    1. GTY1133333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Guide Pin *b Waterproof Seal
      1. Using a T30 "TORX" socket wrench, remove the 5 bolts.
      2. Disengage the 2 guide pins and remove the upper inverter cover.
        NOTE:
        • Do not touch the waterproof seal.
        • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
        • While holding the upper inverter cover horizontally in relation to the guide pin, remove the upper inverter cover.
          GTY1130689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. DISCONNECT NO. 1 INVERTER BUSBAR PLATE 
    WARNING:

    Be sure to wear insulated gloves.
    1. GTY1132251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using an insulated tool and T30 "TORX" socket wrench, remove the 3 bolts and disconnect the No. 1 inverter busbar plate.
        NOTE:
        • Do not allow any foreign matter or water to enter the hybrid motor control inverter assembly.
        • After disconnecting the No. 1 inverter busbar plate, cover the opening of the hybrid motor control inverter assembly with tape (non-residue type) or equivalent to prevent the entry of foreign matter or water.
        • Do not damage the opening of the hybrid motor control inverter assembly with the tool.
  9. LIFT DOWN 
    1. GTY1234487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Temporarily install the engine mounting insulator sub-assembly LH with the 4 bolts (A), 2 bolts (B) and nut.
      2. Remove the transmission jack and lower the vehicle.
  10. DISCONNECT NO. 4 INVERTER COOLING HOSE 
    1. GTY1194135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disengage the clamp.
      2. Slide the clip and disconnect the No. 4 inverter cooling hose from the hybrid motor control inverter assembly.
        NOTE:

        Apply insulating tape to the pipes and in the disconnected hoses, or cover the pipes and hoses with plastic bags to prevent foreign matter from entering the cooling system and to prevent coolant from spilling near the EV converter assembly.

  11. DISCONNECT RESOLVER THERMISTOR WIRE 
    1. GTY1194101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Rotating the lock lever - -
      1. Disconnect the resolver thermistor wire connector.

        HINT: 

        Release the lock before rotating the lock lever.

  12. DISCONNECT ENGINE WIRE 
    1. GTY1202790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Rotating the lock lever - -
      1. Disconnect the engine wire connector.

        HINT: 

        Release the lock before rotating the lock lever.

  13. DISCONNECT BREATHER HOSE 
    1. GTY1122712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a T30 "TORX" socket wrench, remove the bolt and disconnect the breather hose.
  14. REMOVE O-RING 
    HINT: 
    Although the O-ring is reusable, replace it if it is damaged.
    1. GTY1201271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. REMOVE HYBRID MOTOR CONTROL INVERTER ASSEMBLY 
    1. GTY1197149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a T30 "TORX" socket wrench, remove the 12 bolts.
      2. Pull the hybrid motor control inverter assembly out up to a position where it does not interfere with the No. 1 inverter busbar plate, and then remove it.
        NOTE:
        • Pull it out completely removed from the No. 1 inverter busbar plate, so that the No. 1 inverter busbar plate is not damaged, bent, etc.
        • When removing the hybrid motor control inverter assembly from the vehicle, be careful not to damage the surrounding parts.
        • To prevent damage, do not hold the coolant pipes, brackets and connectors when lifting up the hybrid motor control inverter assembly.
        • To prevent damage caused by static electricity, do not touch the terminals of connectors on the hybrid motor control inverter assembly side.
        • If storing the hybrid motor control inverter assembly after removal, store it as shown in the illustration.
          GTY1130073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
          *a Connector Part
          *b Busbar Part
          *c Cooling Pipe
        • When storing the hybrid motor control inverter assembly after removal, be sure to leave the connector cover and non-residue tape installed to prevent the entry of foreign matter, water, etc.
        • If any foreign matter or water has entered inside the hybrid motor control inverter assembly, do not reuse it.
        • Do not directly touch the contact surfaces of mating parts of the hybrid motor control inverter assembly.

        HINT: 

        Even after the coolant is drained, coolant remains in the hybrid motor control inverter assembly due to its internal structure. Therefore, plug or cover the pipes with a plastic bag when removing the hybrid motor control inverter assembly from the vehicle so that coolant does not spill out.

  16. REMOVE INVERTER CASE GASKET 
    1. GTY1131903Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the inverter case gasket.
        NOTE:

        When removing, do not directly touch the gasket contact surface.

  17. REMOVE INLET NO. 1 INVERTER COOLING HOSE 
    1. GTY1132948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE NO. 1 INVERTER BUSBAR PLATE 

    HINT: 

    Perform this procedure only when replacement of the No. 1 inverter busbar plate is necessary.

    1. GTY1199199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a T30 "TORX" socket wrench, remove the 3 bolts and No. 1 inverter busbar plate.
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