COOLANT(for Inverter) REPLACEMENT

PROCEDURE


  1. REMOVE NO. 1 ENGINE UNDER COVER

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  2. DRAIN COOLANT (for Inverter Coolant)

    Note

    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 inveter reserve tank cap.

      CAUTION:

      To avoid the danger of being burned, do not remove the inveter reserve tank cap while the coolant for the inverter is still hot.

    2. A01O955

      Using a 10 mm hexagon wrench, remove the drain plug at the position shown in the illustration, and drain the coolant.

      CAUTION:

      Use caution when handling coolant immediately after driving or in summer because it may be hot.

    3. Install the drain plug with a new gasket.

      Torque:
      39.2 N*m  { 400 kgf*cm, 29 ft.*lbf }

    4. Measure the volume of coolant discharged from the drain.

  3. ADD COOLANT (for Inverter Coolant)

    Note

    If the vehicle is driven with air in the coolant system, damage may occur and the following DTCs may be stored.

    DTC No. Detection Item
    P0A01-726 Motor Electronics Coolant Temperature Sensor Circuit Range / Performance
    P0A04-725 Motor Electronics Coolant Temperature Sensor Circuit Intermittent
    P0A08-264 DC / DC Converter Status Circuit
    P0A78-284 Drive Motor "A" Inverter Performance
    P0A78-286 Drive Motor "A" Inverter Performance
    P0A7A-322 Generator Inverter Performance
    P0A7A-324 Generator Inverter Performance
    P0A93-346 Inverter Cooling System Performance
    P0A94-553 DC / DC Converter Performance
    P0A94-557 DC / DC Converter Performance
    P0AEE-277 Motor Inverter Temperature Sensor "A" Circuit Range / Performance
    P0AF1-276 Drive Motor Inverter Temperature Sensor "A" Circuit Intermittent / Erratic
    P0BCD-315 Generator Inverter Temperature Sensor Circuit Range / Performance
    P0BD0-314 Generator Inverter Temperature Sensor Circuit Intermittent / Erratic
    P0C39-626 DC / DC Converter Temperature Sensor "A" Range / Performance
    P0C3C-625 DC / DC Converter Temperature Sensor "A" Intermittent / Erratic
    P0C3E-628 DC / DC Converter Temperature Sensor "B" Range / Performance
    P0C41-627 DC / DC Converter Temperature Sensor "B" Intermittent / Erratic
    P0C73-776 Motor Electronics Coolant Pump "A" Control Performance

    1. Slowly pour coolant into the inveter reserve tank until it reaches the FULL line.

      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 such as dust or dirt.

      Standard Capacity
      3.1 liters (3.3 US qts, 2.7 Imp. qts.)

    2. When using the GTS:


      1. Connect the GTS 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. Keep the coolant at the FULL line in the inveter reserve tank to compensate for the drop in coolant level when the air bleeds.

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

        Tech Tips


        • If free spinning of the inverter water pump is detected for approximately 5 seconds, fail-safe control will be activated to suspend the operation of the pump for approximately 15 seconds and resume operation for approximately 4 seconds repeatedly. Operation of the inverter water pump will return to normal if coolant is added.

        • A loud noise made by the inverter water pump assembly and poor circulation of coolant in the inveter reserve tank indicates that there is air in the cooling system.

    3. When not using the GTS:


      1. Turn the power switch on (READY). [*1]

      2. Turn the power switch off and add coolant to the FULL line because the coolant level drops as the air bleeds. [*2]

        Note


        • Be sure to turn the power switch off before adding TOYOTA Super Long Life Coolant (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 assembly becomes smaller and the circulation of coolant in the inveter reserve tank improves.

        Tech Tips

        A loud noise made by the inverter water pump assembly and poor circulation of coolant in the inveter reserve tank indicates 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 the inveter reserve tank.

      Note

      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.

    5. Tighten the inveter reserve tank cap.

  4. INSPECT FOR COOLANT LEAK (for Inverter Coolant)

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  5. INSTALL NO. 1 ENGINE UNDER COVER

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