Check Valve (Intake-Air System) Inspection

Verify that there is airflow through port B when pressure is applied from port A.
- If there is no airflow, replace the check valve. (Refer to CHECK VALVE (INTAKE-AIR SYSTEM) REMOVAL/INSTALLATION .)
  
  Fig 1: Checking Airflow Through Check Valve
  Courtesy of MAZDA MOTORS CORP.
Verify that there is no airflow through port A when pressure is applied from port B.
- If there is airflow, replace the check valve. (Refer to CHECK VALVE (INTAKE-AIR SYSTEM) REMOVAL/INSTALLATION .)