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Home >> Lexus >> 2008 >> LS 600hL >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> L110F Hybrid Vehicle Control (Excludes DTC Tests) >> COOLING SYSTEM (for Inverter) >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT FOR COOLANT LEAK (for Inverter) 
    1. Remove the reserve tank cap.
      CAUTION: To avoid the danger of being burned, do not remove the reserve tank cap while the coolant for the inverter is still hot.
    2. Install the radiator cap tester
    3. Pump the radiator cap tester to 37 kPa (0 38 kgf/cm2 , 5.4 psi), and then check that the pressure does not drop.

      HINT

      If the pressure drops, check the hoses, radiator, water pump, inverter with converter, and hybrid vehicle transaxle assembly for leakage

      Fig 1: Inspecting Coolant Leak (For Inverter)
      G05772716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reinstall the reserve tank cap.
  2. INSPECT COOLANT LEVEL IN RESERVE TANK (for Inverter) 
    1. The coolant should be between the LOW and FULL lines when the coolant for the inverter is cold

      HINT:

      If the coolant level is low, check for leakage 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.

  3. INSPECT COOLANT (for Inverter) 
    1. Remove the reserve tank cap.
      CAUTION: To avoid the danger of being burned, do not remove the reserve tank cap while the coolant for the inverter is still hot.
    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 the inverter.

    3. Reinstall the reserve tank cap
  4. INSPECT RESERVE TANK CAP (for Inverter) 
    1. Inspect the reserve tank cap.
      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.
        Fig 2: Identifying O-Ring And Rubber Packing
        G05009709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.
      1. Apply coolant (for inverter) to the O-ring and rubber packing before using a radiator cap tester.
      2. Pump the cap tester several times, and check the maximum pressure.

        Judgment criterion 

        STANDARD VALUE (FOR BRAND-NEW CAP)

        Standard value (for brand-new cap) 93 3 to 122 7 kPa {0 95 to 1 25 kgf/cm2 , 13 5 to 17 8 psi}
        Minimum standard value (for used cap) 78 5 kPa {0 8 kgf/cm2 , 11 4 psi}
        Pump speed 1 pump per second
        Fig 3: Checking Reserve Tank Cap Operation
        G05009710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE: When using the cap tester, tilt it more than 30 degrees.

        HINT:

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

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