Air Cleaner Cap Sub-Assembly (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.

Cover port "C" with finger and check that air flows from port "B" to port "A". See Fig 1.
Cover port "C" with finger and check that air does not flow from port "A" to port "B".
Cover ports "A" and "C" with fingers, apply 18 in. Hg (60 kPa) of vacuum to port "B" and check that there is not change of vacuum after one minute.
Repair or replace as necessary.

Fig 1: Checking Air Cleaner Cap Sub-Assembly