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Replacement [10/2018 - ]: Procedure

  1. REMOVE REAR ENGINE UNDER COVER LH 
    1. Remove the 2 screws, 6 clips and rear engine under cover LH.
      GTY826514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. DRAIN COOLANT (for Inverter) 
    WARNING:
    • When coolant (for inverter) is hot, do not remove the reserve tank cap or the drain cock plug.
    • Fluid and steam may spray out due to high pressure, possibly resulting in burns.
      GTY786984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Connect a hose with an inside diameter of 9 mm (0.354 in.) to the radiator drain cock as shown in the illustration.
      GTY800028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Hose
    3. Loosen the drain cock plug indicated in the illustration and drain the coolant.
      GTY826512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Tighten the drain cock plug by hand.
    5. Disconnect the hose from the radiator drain cock.
  3. 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
      P0A001F Motor Electronics Coolant Temperature Sensor Circuit Intermittent
      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
      P0AED1F Drive Motor Inverter Temperature Sensor "A" Circuit Intermittent
      P0C381C DC/DC Converter Temperature Sensor "A" Circuit Voltage Out of Range
      P0C381F DC/DC Converter Temperature Sensor "A" Circuit Intermittent
      P0C3D1C DC/DC Converter Temperature Sensor "B" Circuit Voltage Out of Range
      P0C3D1F DC/DC Converter Temperature Sensor "B" Circuit Intermittent
      P1CCC96 DC/DC Converter Enable Component Internal Failure
    1. Slowly pour coolant into the inverter reserve tank assembly until it reaches the FULL line.

      Standard Capacity

      1.6 liters (1.7 US qts, 1.4 Imp. qts)

      GTY576519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 Techstream:
      1. Connect the Techstream to the DLC3.
      2. Turn the power switch on (IG).
      3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Inverter Water Pump.

        Powertrain > Hybrid Control > Active Test 

        Tester Display
        Activate the Inverter Water Pump
      4. 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 Techstream:
      1. Turn the power switch on (READY). [*1]
      2. Turn the power 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 power switch off before adding SLLC.
        • Do not work on the components in the engine compartment while the power 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.
      GTY787008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT FOR COOLANT LEAK (for Inverter) 

    Refer to PROCEDURE - Step 1

  5. INSTALL REAR ENGINE UNDER COVER LH 
    1. Install the rear engine under cover LH with the 2 screws and 6 clips.
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