The system for reducing the toxicity of exhaust gases of the Nissan Sunny cars in question includes the crankcase ventilation system, as well as the following systems, which are provided on parts of cars, depending on the modification.
On carburetor engines without a converter - an idle speed corrector and a throttle valve pneumatic shock absorber
On carbureted engines with a converter without a recirculation system - a converter, an idle speed corrector and a throttle damper
On carburetor engines with a converter and a recirculation system - a converter, systems for catching gasoline vapors, recirculation and post-oxidation of exhaust gases, an idle speed corrector and a throttle valve pneumatic shock absorber.
On engines with a direct fuel injection system - a converter, gasoline vapor recovery and recirculation systems, an idle speed corrector.
Maintenance of the system is reduced to inspecting the hoses and periodically replacing the filter.