System Overview - Mercedes-Benz OM 471 Introduction Into Service Manual

Functions

System overview

1 Nozzle unit for DPF regeneration
2 Pump module
3 AdBlue" tank
4 Exhaust aftertreatment unit
5 Ammonia blocking CAT
6 SCR catalytic converter
7 Diesel oxidation catalytic
converter (DOC)
8 Diesel particulate filter (DPF)
9 Diesel fuel metering device (for
DPF regeneration)
A4 Engine management control unit
(MCM)
A57 NOx sensor control unit output for
exhaust aftertreatment unit
A57 b1 NOx sensor output for exhaust
aftertreatment unit
74
A58 SCR control unit
A60 Exhaust aftertreatment (ACM)
control unit
A67 AdBlue" metering device
A70 NOx sensor control unit input for
exhaust aftertreatment unit
A70 b1 NOx sensor input for exhaust
aftertreatment unit
B37 Exhaust pressure sensor upstream
of diesel oxidation catalytic
converter
B38 Exhaust pressure sensor
downstream of diesel particulate
filter
B67 Exhaust temperature sensor
upstream of diesel oxidation
catalytic converter
B68 Exhaust temperature sensor
downstream of upper diesel
oxidation catalytic converter
– This printout will not be recorded by the update service. Status: 09 / 2011 –
W14.40>1557>79
B69 Exhaust temperature sensor
downstream of lower diesel
oxidation catalytic converter
B70 Exhaust temperature sensor
downstream of diesel particulate
filter
B73 Exhaust temperature sensor
downstream of SCR catalytic
converter
B74 AdBlue" fill level
sensor/temperature sensor
B625 Fuel pressure sensor (inlet)
B626 Fuel pressure sensor (outlet)
M25 SCR delivery pump
Y627 AdBlue" heater coolant solenoid
valve
Y628 Fuel metering valve
Y629 Fuel shutoff valve