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Home › Toyota › 1989 › Pickup Base › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests - 4-CYL CARBURETED › Air Injection System Test › Check Valve

Check Valve

  1. Inspect check valve by blowing air from each side of valve. Ensure air does not flow from manifold side of check valve to Air Switching Valve (ASV).
  2. Air should flow from ASV to manifold. If check valve does not function as described, replace valve.
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