Check Valve (Intake-Air System) Inspection

WARNING: This page is about a different car, the 2017 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.

Verify that there is airflow through port B when pressure is applied from port A.
- If there is no airflow, replace the check valve. (See CHECK VALVE (INTAKE-AIR SYSTEM) REMOVAL/INSTALLATION .)
Fig 1: Airflow Of Check Valve (Intake-Air System)
Courtesy of MAZDA
Verify that there is no airflow through port A when pressure is applied from port B.
- If there is airflow, replace the check valve. (See CHECK VALVE (INTAKE-AIR SYSTEM) REMOVAL/INSTALLATION .)