Exhaust gas recirculation system
 Two thermally operated control valves which, in cooperation with each other, admit into the vacuum chamber of the diaphragm unit for the EGR control valve atmospheric air only during cold engine operation, both atmospheric air and engine suction vacuum during engine warming-up operation, and engine suction vacuum only during engine normal operation. 
Nissan Motor Company, Limited
F Y F
F02M Y10T F02M
inventional additional additional
Masaaki Akihiro
Saito Ohnishi