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Air Suction (As) Valve

  1. To check AS valve on Federal models, blow and suck on pipe. On Tercel sedan and 4WD wagon equipped with automatic transmission, check that no air passes when sucked from filter side, but air passes when blown hard. On all other Federal models, check that no air passes when blown hard from converter side, but air passes when sucked. If not, replace valve.
  2. To check AS valve on California models, apply vacuum to diaphragm. Verify air flows from filter side to outlet port. Air should not flow from outlet port to filter side. Release vacuum and verify very little air flows from filter side to outlet pipe. If not, replace valve.
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