Exhaust gas recirculation

Exhaust gas recirculation system

On the 1.6l TDI engine, the exhaust gas recirculation valve and the exhaust gas cooler with exhaust gas flap have been combined into a single module. The advantages of the modular design are a compact space requirement and, at the same time, a shorter control path. The exhaust gas recirculation module is bolted to the exhaust side of the cylinder head and the exhaust manifold. The module is connected to the intake manifold directly through the cylinder head. This allows additional cooling of the recirculated exhaust gases.

Design

Function

The exhaust gas recirculation helps reduce nitrogen oxide emissions. Part of the exhaust gases are returned to the combustion process. The recirculation quantity is regulated by the engine control unit taking the engine speed, intake air quantity, intake air temperature, injection quantity and air pressure into account.

Legend

• G39 Lambda probe
• G62 Coolant temperature sender
• G69 Throttle valve potentiometer
• J338 Throttle valve module
• J623 Engine control unit
• N18 Exhaust gas recirculation valve
• N345 Exhaust gas recirculation cooler change-over valve
• A Exhaust gas recirculation module
• B Vacuum unit
• C Catalytic converter

Intake manifold

The intake manifold is made from plastic. The combination of all exhaust gas recirculation components in the new exhaust gas recirculation module on the exhaust side means there is no separate exhaust gas recirculation valve on the intake manifold. As a result, an aluminium intake manifold is not required.