Turbocharger Air By-Pass Valve

Remove air by-pass valve. Connect vacuum pump to port "A" of valve. Apply vacuum to port "A" and compressed air to port "B". See Fig 1 . Verify air flows through valve with prescribed vacuum applied to port "A". See AIR BY-PASS VALVE VACUUM SPECIFICATION  table. Replace air by-pass valve if it does not operate as indicated.

Fig 1: Testing Air By-Pass Valve

Courtesy of MAZDA MOTORS CORP.