SPECIAL INSTRUCTIONS FOR -SCR- EXHAUST SYSTEMS 6-5 E UROCARGO Euro 4/5 Main system components Pump module Figure 6.3 108128 1. Ad Blue return Pipe to the tank - 2. Ad Blue return Pipe from Dosing module - 3. Ad Blue solution outlet - 4. Ad Blue solution inlet - 5. Electrical connection - 6. DCU control unit - 7. Filter - 8. Pre-filter Dosing module Figure 6.4 108128 1. Ad Blue inlet - 2. Electrical connection - 3. Ad Blue outlet Its task is to meter the Ad Blue solution sent to the exhaust pipe upstream of catalyst. The nitrogen oxide catalytic reduction principle. AdBlue Print 603.93.431 Base - January 2008