Mercedes-Benz OM 471 Introduction Into Service Manual page 72

1 Pump module
2 Exhaust aftertreatment unit
3 Ammonia locking CAT
4 SCR catalytic converter
5 AdBlue" tank
A4 Engine management control unit
(MCM)
A57 NOx sensor control unit outlet of
EATU
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
A57 b1 NOx sensor outlet of EATU
A58 SCR control unit
A60 Exhaust aftertreatment (ACM)
control unit
A67 AdBlue" metering device
A70 NOx sensor control unit inlet of
EATU
A70 b1 NOx sensor inlet of EATU
– This printout will not be recorded by the update service. Status: 09 / 2011 –
Functions
W14.40>1590>79
B72 Exhaust temperature sensor
upstream of SCR catalytic converter
B73 Exhaust temperature sensor
downstream of SCR catalytic
converter
B74 AdBlue" fill level
sensor/temperature sensor
M25 SCR delivery pump
Y627 AdBlue" heater coolant solenoid
valve
69