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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> Maintenance >> Procedures >> Maintenance - Service Information (1 Of 2) >> A25A-FXS COOLANT (for Inverter) >> Replacement [10/2022 - ] >> Procedure

Replacement [10/2022 - ]: Procedure

  1. DRAIN COOLANT (for Inverter) 
    WARNING:

    To avoid the danger of being burned, do not remove the reserve tank cap while the coolant (for inverter) is still hot. Pressurized, hot coolant (for inverter) and steam may be released and cause serious burns.

    NOTE:
    • Do not reuse the drained coolant because it may contain foreign matter.
    • Collect the drained coolant and measure its volume to establish a benchmark. When adding coolant, make sure to add more coolant than the measured amount.
    1. Remove the reserve tank cap from the inverter reserve tank assembly.
    2. Remove the front fender front splash shield LH.

      Refer to PROCEDURE - Step 7 [10/2022 - 10/2024] , or refer to PROCEDURE - Step 7 [10/2024 - ]

    3. Remove the front fender front splash shield RH.

      Refer to PROCEDURE - Step 8 [10/2022 - 10/2024] , or refer to PROCEDURE - Step 8 [10/2024 - ]

    4. Remove the No. 1 engine under cover.

      Refer to PROCEDURE - Step 9 [10/2022 - 10/2024] , or refer to PROCEDURE - Step 9 [10/2024 - ]

    5. Connect a hose to the drain cock as shown in the illustration.
      GTY1133377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Loosen the drain cock plug indicated in the illustration and drain the coolant.
      WARNING:

      To avoid the danger of being burned, do not loosen the drain cock plug while the coolant (for inverter) is still hot. Pressurized, hot coolant (for inverter) and steam may be released and cause serious burns.

    7. Tighten the drain cock plug by hand.
    8. Disconnect the hose from the drain cock.
    9. Install the No. 1 engine under cover.

      Refer to PROCEDURE - Step 69 [10/2022 - 10/2024] , or refer to PROCEDURE - Step 64 [10/2024 - ]

    10. Install the front fender front splash shield LH.

      Refer to PROCEDURE - Step 67 [10/2022 - 10/2024] , or refer to PROCEDURE - Step 62 [10/2024 - ]

    11. Install the front fender front splash shield RH.

      Refer to PROCEDURE - Step 68 [10/2022 - 10/2024] , or refer to PROCEDURE - Step 63 [10/2024 - ]

  2. ADD COOLANT (for Inverter) 
    NOTE:
    • Do not reuse the drained coolant because it may contain foreign matter.
    • If the vehicle is driven with air in the inverter cooling system, damage may occur and the following DTCs may be stored.
      DTC No. Detection Item
      P0A93-00 Inverter "A" Cooling System Performance
      P0A00-1C Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range
      P0A78-9E Drive Motor "A" Inverter Stuck On
      P1C5D-19 Drive Motor "A" Inverter Circuit Current Above Threshold
      P0A7A-9E Generator Inverter Stuck On
      P1C5F-19 Generator Inverter Circuit Current Above Threshold
      P0A94-9E DC/DC Converter Stuck On
      P0D33-19 DC/DC Converter Circuit Current Above Threshold
      P0AED-1C Drive Motor Inverter Temperature Sensor "A" Circuit Voltage Out of Range
      P0C38-1C DC/DC Converter Temperature Sensor "A" Circuit Voltage Out of Range
      P0C3D-1C DC/DC Converter Temperature Sensor "B" Circuit Voltage Out of Range
      P1CCC-96 DC/DC Converter Enable Component Internal Failure
    1. Slowly pour coolant into the inverter reserve tank assembly until it reaches the FULL line.
      GTY1075450Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Capacity

      2.0 liters (2.1 US qts, 1.8 Imp. qts)

      NOTE:

      To prevent foreign matter such as dust or dirt from entering the cooling system, make sure to confirm that the container used to add coolant is clean and free of foreign matter.

    2. When using the GTS:
      1. Activate the Inverter Water Pump

        Powertrain > Hybrid Control > Active Test 

        Tester Display
        Activate the Inverter Water Pump
      2. While adding coolant to the inverter reserve tank assembly to keep the coolant at the FULL line and compensate for the drop in the coolant level as the air bleeds, operate and stop the inverter water pump with motor assembly at 1 minute intervals.

        Standard

        Air bleeding from the inverter cooling system is completed when the noise made by the inverter water pump with motor assembly becomes smaller and the circulation of coolant in the inverter reserve tank assembly improves.

        HINT: 

        Loud noises made by the inverter water pump with motor assembly and poor circulation of coolant in the inverter reserve tank assembly indicate that there is air in the cooling system.

    3. When not using the GTS:
      1. Turn the ignition switch to ON (READY). [*1]
      2. Turn the ignition switch off and add coolant to the FULL line as the coolant level will drop as the air bleeds. [*2]
        NOTE:
        • Be sure to turn the ignition switch off before adding SLLC.
        • Do not work on the components in the engine compartment while the ignition switch is ON (READY) as the engine will operate intermittently.
      3. Repeat steps [*1] and [*2] until air bleeding from the cooling system is completed.

        Standard

        Air bleeding from the inverter cooling system is completed when the noise made by the inverter water pump with motor assembly becomes smaller and the circulation of coolant in the inverter reserve tank assembly improves.

        HINT: 

        Loud noises made by the inverter water pump with motor assembly and poor circulation of coolant in the inverter reserve tank assembly indicate that there is air in the cooling system.

    4. After the air is completely bled from the cooling system, add coolant to the FULL line of inverter reserve tank assembly and install the reserve tank cap.
      GTY1075450Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT FOR COOLANT LEAK (for Inverter) 

    Refer to PROCEDURE - Step 1

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