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Home >> Toyota >> 2016 >> Prius C One >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Battery Management Systems >> Hybrid Battery Control System (Service Information) >> COOLANT (for Inverter) >> Replacement [11/2015 - 06/2017] >> Procedure

Replacement [11/2015 - 06/2017]: Procedure

  1. DRAIN COOLANT (for Inverter) 
    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.
      WARNING:

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

    2. Loosen the radiator drain cock plug and drain the coolant.
      GTY333976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WARNING:

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

    3. Tighten the radiator drain cock plug.
  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 Code 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 reserve tank until it reaches the full line.
      GTY334029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Coolant quantity

      1.6 liters (1.7 US qts, 1.4 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 such as dust or dirt.

    2. When using the Techstream:
      1. Connect the Techstream to the DLC3.
      2. Turn the ignition switch on (IG).
      3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
      4. Keep the coolant at the full line in the 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.

        HINT: 

        • 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 reserve tank indicates that there is air in the cooling system.
    3. When not using the Techstream:
      1. Turn the ignition switch to ON (READY). [*1]
      2. Turn the ignition 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 ignition switch off before adding SLLC.
        • Do not work on the components in the engine compartment while the vehicle is in the READY-on state because the engine is in intermittent operation.
      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 reserve tank improves.

        HINT: 

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

    4. After the air is completely bled from the cooling system, tighten the reserve tank cap.
    5. Add coolant to the full line of the reserve tank.
      GTY334029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT FOR COOLANT LEAK (for Inverter) 

    See step  1

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