On-Vehicle Inspection [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT RESERVE TANK CAP (for Intercooler)
- Measure the valve opening pressure.
- If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.
*a O-ring *b Rubber Packing NOTE:Always perform procedure by hand so as not to damage the O-ring.
- Check that the O-ring is not deformed, cracked or swollen.
- Apply engine coolant to the O-ring and rubber packing before using a radiator cap tester.
- When using the radiator cap tester, tilt it more than 30° degrees.
*1 Reserve Tank Cap (for Intercooler) *a Radiator Cap Tester *b 30° or more - Pump the radiator cap tester several times and check the maximum pressure*.
Pump speed
1 pump per second
*: Even if the cap cannot maintain the maximum pressure, it is not a defect.
Standard Judgment Criterion
Item Specified Condition Standard value
(for brand-new cap)93 to 123 kPa (1.0 to 1.3 kgf/cm2 , 13.5 to 18 psi) Minimum standard value
(for used cap)79 kPa (0.8 kgf/cm2 , 11.4 psi) If the maximum pressure is less than the minimum standard value, replace the reserve tank cap (for Intercooler).
- If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.
- Measure the valve opening pressure.