Low Pressure (LP) Exhaust Gas RECIRCULATION (EGR)
The Low Pressure (LP) EGR system is used on EU5 and EU6 market vehicles only.
The LP system takes exhaust gases from the exit of the Diesel Particulate Filter (DPF) system, and mixes it with the fresh air intake into the turbocharger.
There is a simple mesh filter fitted before the gasses reach the outlet of the cooler that prevents larger particles of soot etc. from entering the turbocharger system. The mesh filter is a non-serviceable component.
The cooled gases are then directed through the LP EGR valve, via a butterfly flap.
The valve consists of a tube between the fresh air duct and the turbocharger, with the butterfly valve covering the EGR inlet, in the center bottom of the EGR valve.
The butterfly valve opens into the fresh air stream, promoting both thorough mixing before the gas enters the turbocharger, and also provides 'suction' to drive the LP EGR gas through the system.