Vacuum Switching Valve Assembly No. 1 (ES300)
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
- Using an ohmmeter, check that there is continuity between each terminal. Resistance should be 33-39 ohms at 68°F (20°C). See Fig 1.
- Check that air flows from port "B" to filter.
- Apply battery voltage across terminals. Check that air flows from port "B" to port "A".
- Repair or replace as necessary.