Air Suction System: Testing: Corolla
- Check condition of all hoses and tubes. Disconnect air suction hose from air cleaner and start cold engine. Listen at air suction hose. As engine warms up, a "bubbling" noise should be heard at idle. No noise should be heard when engine is cold.
- Follow small hose from end of air suction valve to TVTV. Disconnect the hose; "bubbling" noise should stop. Reconnect hose; noise should start within a few seconds. If system operates properly, testing is complete. If not, check valve and TVTV.
- With TVTV below 46°F (8°C), close port "S". Air should flow from port "M" to "A". Raise temperature of TVTV in warm water to 66° F (19°C). With port "S" blocked, air should not flow from "M" to "A".
- Air should flow from port "M" to "S" easily. Air should pass with difficulty from port "S" to "M". Replace TVTV if operation is not correct.
- Remove air suction valve and apply vacuum to pipe on vacuum chamber "B". Air passage should close. Remove vacuum and try to blow air from outlet pipe to air cleaner side. Air should not pass. Replace valve if operation is not correct.