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On-Vehicle Inspection [10/2018 - ]: Procedure

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  1. INSPECT FOR COOLANT LEAK (for Inverter) 
    1. Remove the reserve tank cap from the inverter reserve tank assembly.
      WARNING:
      • When coolant (for inverter) is hot, do not remove the reserve tank cap.
      • Fluid and steam may spray out due to high pressure, possibly resulting in burns.
      GTY786984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Add coolant to the FULL line of the inverter reserve tank assembly.
    3. Install a radiator cap tester to the inverter reserve tank assembly.
      GTY787005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Pump the radiator cap tester to 122 kPa (1.2 kgf/ cm2 , 18 psi), and then check that the pressure does not drop.

      HINT: 

      • If the pressure drops, check the hoses, radiator assembly, inverter water pump with motor assembly, hybrid vehicle transaxle assembly, and inverter with converter assembly for leaks.
      • If there are signs of coolant leakage between the inverter water pump with motor assembly and water hose (for Inverter), replace the inverter water pump with motor assembly, outlet No. 1 hybrid water pump hose and hybrid water pump inlet hose.
        GTY833790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Outlet No. 1 Hybrid Water Pump Hose
        *2 Inlet Hybrid Water Pump Hose
        *3 Inverter Water Pump with Motor Assembly
    5. Reinstall the reserve tank cap to the inverter reserve tank assembly.
  2. INSPECT COOLANT LEVEL IN RESERVE TANK (for Inverter) 
    1. The coolant should be between the LOW and FULL lines when the coolant (for inverter) is cold.

      HINT: 

      If the coolant level is low, check for leaks and add TOYOTA Super Long Life Coolant (SLLC) or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the FULL line.

      GTY787008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT COOLANT QUALITY (for Inverter) 
    1. Remove the reserve tank cap from the inverter reserve tank assembly.
      WARNING:
      • When coolant (for inverter) is hot, do not remove the reserve tank cap.
      • Fluid and steam may spray out due to high pressure, possibly resulting in burns.
      GTY786984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for excessive deposits of rust or scale on and around the reserve tank cap and its opening.

      HINT: 

      If excessively dirty, replace the coolant (for inverter).

    3. Reinstall the reserve tank cap to the inverter reserve tank assembly.
  4. INSPECT RESERVE TANK CAP (for Inverter) 
    1. Inspect the reserve tank cap.
      GTY426682Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a O-ring
      *b Rubber Packing
      1. If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.
        NOTE:

        Do not use any tools.

      2. Check that the O-ring is not deformed, cracked, or damaged.
      3. Check that the O-ring is not swollen.
    2. Check the reserve tank cap operation.
      GTY450739Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Reserve Tank Cap
      *a Radiator Cap Tester
      *b 30° or more
      1. Apply coolant to the O-ring and rubber packing before using a radiator cap tester.
      2. Install the reserve tank cap to the radiator cap tester.
      3. Pump the radiator cap tester several times and check the maximum pressure.
        JUDGMENT CRITERION

        Standard Value (for Brand-new Cap) 94 to 122 kPa (1.0 to 1.2 kgf/cm2 , 13.6 to 18 psi)
        Minimum Standard Value (for Used Cap) 94 kPa (1.0 kgf/cm2 , 13.6 psi)
        Pump Speed 1 pump per second
        NOTE:

        When using the radiator cap tester, tilt it upward 30° or more.

        If the maximum pressure is less than the minimum standard value, replace the reserve tank cap.

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