Check Valve

Remove check valve from air manifold. Blow air into air pump side of check valve. Air should pass freely to manifold side of check valve. Blow air into manifold side of check valve. Air should not pass to air pump side of valve. Replace check valve if defective.

Fig 1: Testing Air Management Valve

Courtesy of ISUZU MOTOR CO.

Fig 2: Air Management Valve Operating Conditions

Courtesy of ISUZU MOTOR CO.