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Replacement [12/2023 - ]: 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 front wheel opening extension pad LH.

      Refer to PROCEDURE - Step 7

    2. Remove the front wheel opening extension pad RH.

      Refer to PROCEDURE - Step 8

    3. Remove the No. 1 engine under cover.

      Refer to PROCEDURE - Step 9

    4. Remove the reserve tank cap from the inverter reserve tank assembly.
    5. Connect a hose to the drain cock as shown in the illustration.
      GTY1237840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Hose
    6. Loosen the 2 drain cock plugs 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 2 drain cock plugs by hand.
    8. Disconnect the hose from the drain cock.
    9. Install the No. 1 engine under cover.

      Refer to PROCEDURE - Step 81

    10. Install the front wheel opening extension pad LH.

      Refer to PROCEDURE - Step 82

    11. Install the front wheel opening extension pad RH.

      Refer to PROCEDURE - Step 83

  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
      P0A9300 Inverter "A" Cooling System Performance
      P0C7396 Motor Electronics Coolant Pump "A" Component Internal Failure
      P0A001C Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range
      P0A789E Drive Motor "A" Inverter Stuck On
      P1C5D19 Drive Motor "A" Inverter Circuit Current Above Threshold
      P0A7A9E Generator Inverter Stuck On
      P1C5F19 Generator Inverter Circuit Current Above Threshold
      P0A949E DC/DC Converter Stuck On
      P0D3319 DC/DC Converter Circuit Current Above Threshold
      P0AED1C Drive Motor Inverter Temperature Sensor "A" Circuit Voltage Out of Range
      P0C381C DC/DC Converter Temperature Sensor "A" Circuit Voltage Out of Range
      P0C3D1C DC/DC Converter Temperature Sensor "B" Circuit Voltage Out of Range
      P1CCC96 DC/DC Converter Enable Component Internal Failure
    1. Slowly pour coolant into the inverter reserve tank assembly until it reaches the Max line.
      GTY1228038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Capacity

      5.5 liters (5.8 US qts, 4.8 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. Enter the following menus: Powertrain / HybridControl / Active Test / Activate the Inverter Water Pump.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Activate the Inverter Water Pump

      HINT: 

      The inverter water pump with motor assembly can also be operated using inspection mode.

      Refer to INSPECTION MODE PROCEDURE [09/2023 - ]

    3. While adding coolant to the inverter reserve tank assembly to keep the coolant at the Max line and compensate for the drop in the coolant level as the air bleeds, operate and stop the inverter waterpump 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.

    4. After the air is completely bled from the inverter cooling system, add coolant to the Max line of inverter reserve tank assembly and install the reserve tank cap.
      NOTE:

      Make sure that more coolant than the volume collected coolant volume is added.

  3. INSPECT FOR COOLANT LEAK (for Inverter) 

    Refer to PROCEDURE - Step 1

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