Check Valve Inspection

Remove the check valve. (See CHECK VALVE REMOVAL/INSTALLATION ).
Verify that there is no airflow when positive pressure is applied to port A.
U. S. A. and CANADA specs.

Fig 1: Inspecting Check Valve For No Airflow (USA And CANADA Specs)
Courtesy of MAZDA MOTORS CORP.

Except U. S. A. and CANADA specs.

Fig 2: Inspecting Check Valve For No Airflow (Except USA And CANADA Specs)
Courtesy of MAZDA MOTORS CORP.
- If there is airflow, replace the check valve. (See CHECK VALVE REMOVAL/INSTALLATION ).
Verify that there is no airflow when negative pressure is applied to port A.
- If there is no airflow, replace the check valve. (See CHECK VALVE REMOVAL/INSTALLATION ).