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COOLANT (for Inverter): Replacement

  1. REMOVE ENGINE ROOM SIDE COVER RH  (See REMOVAL )
  2. REMOVE ENGINE ROOM SIDE COVER LH  (See REMOVAL )
  3. REMOVE FRONT CENTER FLOOR COVER  (See REMOVAL )
  4. DRAIN COOLANT (for Inverter) 
    NOTE:
    • Do not reuse the drained coolant because it may contain foreign objects.
    • 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 inverter reserve tank cap.
      CAUTION: To avoid the danger of being burned, do not remove the inverter reserve tank cap while the coolant for the inverter is still hot.
      NOTE: Do not remove the bleeding cap from the tube.
    2. Using a hexagon wrench (10 mm), remove the drain plug indicated in the illustration and drain the coolant.
      CAUTION: Use caution when handling coolant immediately after driving or in summer because it may be hot.
      Fig 1: Locating Drain Plug
      G05772719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a hexagon wrench (10 mm), install the drain plug with a new gasket

      Torque: 39 N*m (400 kgf*cm, 29 ft.*lbf) 

    4. Measure the volume of the drained coolant
  5. ADD COOLANT (for Inverter) 
    NOTE:
    • Do not reuse the drained coolant because it may contain foreign objects.
    • If the vehicle is driven with air in the inverter cooling system, the following DTCs may be set.
    DTC CODE AND DETECTION ITEM

    DTC Code Detection Item
    P0A01-725 Motor Electronics Coolant Temperature Sensor Circuit Range / Performance
    P0A01-726 Motor Electronics Coolant Temperature Sensor Circuit Range / Performance
    P0A78-284 Drive Motor "A" Inverter Performance
    P0A7A-322 Generator Inverter Performance
    P0A93-346 Inverter Cooling System Performance
    P0A94-553 DC / DC Converter Performance
    P0AEE-276 Motor Inverter Temperature Sensor "A" Circuit Range / Performance
    P0AEE-277 Motor Inverter Temperature Sensor "A" Circuit Range / Performance
    P3221-314 Generator Inverter Temperature Sensor Circuit Range / Performance
    P3221-315 Generator Inverter Temperature Sensor Circuit Range / Performance
    P3226-562 DC/DC Boost Converter Temperature Sensor
    P3226-563 DC/DC Boost Converter Temperature Sensor

    HINT:

    Coolant (for inverter) capacity 2.6 liters (2 8 US qts, 2 3 lmp. qts.)

    1. Remove the 2 bleeding caps from the tube
      2. Fig 2: Locating Bleeding Caps
      G05772720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Add coolant to the reserve tank
    3. Install the 2 bleeding caps to the tube.
    4. Connect the intelligent tester to the DLC3.
    5. Select the following menu items

      HINT:

      The water pump can also be operated using inspection mode (See INSPECTION MODE PROCEDURE ).

      1. Intelligent tester - Select. DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP
      2. Techstream - Select Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
    6. While adding coolant so that the coolant level is kept around the FULL line of the inverter reserve tank, operate the water pump for 3 minutes or more and then stop it for 1 minute or more
      Fig 3: Locating Bleeding Caps
      G05772720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. While adding coolant so that the coolant level is kept around the FULL line of the inverter reserve tank, operate the water pump for 1 minute or more and stop it for 1 minute or more. Repeat this procedure until bleeding is completed.

      Standard: When the operation sound of the water pump becomes small or when no air bubbles can be seen in the inverter reserve tank, bleeding of the coolant system is complete. 

      HINT:

      • If the water pump operates without a sufficient amount of coolant for approximately 5 seconds, the protective circuit will activate to stop the water pump for approximately 15 seconds. If a sufficient amount of coolant is added, the water pump will start operating automatically.
      • If an excessive amount of coolant is added to the inverter reserve tank, coolant may overflow when operation of the water pump is stopped.
    8. After bleeding is completed, add coolant to the FULL level, and install the inverter reserve tank cap.
      NOTE: Make sure to add more coolant than was drained initially.
  6. INSPECT FOR COOLANT LEAK (for Inverter)  (See ON-VEHICLE INSPECTION  )
  7. INSTALL FRONT CENTER FLOOR COVER  (See INSTALLATION )
  8. INSTALL ENGINE ROOM SIDE COVER LH  (See INSTALLATION )
  9. INSTALL ENGINE ROOM SIDE COVER RH  (See INSTALLATION )
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