Check Valve (One-Way) Inspection

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Remove the check valve.
Verify that there is airflow at port B when blowing air by mouth from port A.
Verify that there is no airflow at port A when blowing air by mouth from port B.
- If it cannot be verified, replace the check valve.
Fig 1: Identifying Check-Valve Ports
Courtesy of MAZDA MOTORS CORP.