Check Valve Inspection

Remove the charge air cooler duct.
Disconnect the vacuum hose connected between the check valve and the purge solenoid valve from the purge solenoid valve.
Disconnect the vacuum hose connected between the check valve and the intake manifold from the intake manifold.
Blow through the check valve and verify that air flows as specified.
- If not as specified, replace the check valve.

SPECIFICATION CHART

Condition

Airflow

Air applied from port A to B

Yes

Air applied from port B to A

No⁽¹⁾

⁽¹⁾	The check valve is normal if the aeration to port B is 3.5 kPa/min {0.03 kgf/cm2 min, 0.5 psi/min} or less when 130 kPa {1.32 kgf/cm2, 18.9 psi} is applied to port A.

Fig 1: Identifying Port A And B

Courtesy of MAZDA MOTORS CORP.