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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Cooling System (M20A-FXS) (Inspection)) >> Cooling System >> On-Vehicle Inspection [10/2018 - 10/2019] >> Procedure

On-Vehicle Inspection [10/2018 - 10/2019]: Procedure

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  1. INSPECT FOR COOLANT LEAK (for Engine) 
    WARNING:
    • When engine assembly and radiator assembly is hot, do not remove the radiator cap sub-assembly and air release valve.
      GTY732908Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Fluid and steam may spray out due to high pressure, possibly resulting in burns.
    1. Remove the reserve tank cap.
    2. Fill the reserve tank assembly with engine coolant, and then install a radiator cap tester.
      GTY828786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Radiator Cap Tester
    3. Put the engine in inspection mode (maintenance mode).

      Refer to INSPECTION MODE PROCEDURE [10/2018 - ]

    4. Warm up the engine.
    5. Pump the radiator cap tester to 122 kPa (1.2 kgf/cm2 , 17 psi), and then check that the pressure does not drop.
      • If the pressure drops, check the hoses, radiator assembly and engine water pump assembly for leaks.
      • If there are no signs of external engine coolant leaks, check the heater core, cylinder block sub-assembly and cylinder head sub-assembly.
    6. Remove the radiator cap tester.
    7. Install the reserve tank cap.
  2. INSPECT ENGINE COOLANT LEVEL IN RESERVOIR (for Engine) 
    1. Check that the engine coolant level is between the low line and full line when the engine is cold.

      If the engine coolant level is low, check for leaks and add engine coolant to the full line.

      GTY807864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Full Line
      *b Low Line
      NOTE:
      • Do not substitute plain water for engine coolant.
      • The coolant levels in the compartments inside the radiator reserve tank assembly may differ, but this is not a malfunction.
  3. INSPECT ENGINE COOLANT QUALITY (for Engine) 
    WARNING:
    • When engine assembly and radiator assembly is hot, do not remove the radiator cap sub-assembly and air release valve.
      GTY732908Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Fluid and steam may spray out due to high pressure, possibly resulting in burns.
    1. Remove the reserve tank cap.
    2. Check that there are no excessive deposits of rust or scale around the reserve tank cap and water filler hole. Also, the engine coolant should be free of oil.

      If excessively dirty, clean the engine coolant passage and replace the engine coolant.

    3. Install the reserve tank cap.
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