Location Of Sensors - Mercedes-Benz OM 471 Introduction Into Service Manual

System components

Location of sensors

1 Exhaust aftertreatment unit
2 Ammonia slip catalytic converter
3 SCR catalytic converter
4 Mixing tube (hydrolysis segment)
A57 b1 EATU output NOx sensor
A67 AdBlue" metering device
A70 b1 EATU input NOx sensor
B72 Exhaust temperature sensor
upstream of SCR catalytic converter
B73 Exhaust temperature sensor
downstream of SCR catalytic
converter
A Exhaust from the engine
B Exhaust cleaned (to atmosphere)
Function
1 Exhaust aftertreatment unit
2 Ammonia slip catalytic converter
3 SCR catalytic converter
4 Mixing tube (hydrolysis segment)
The exhaust from the engine (a) flows through the inlet tube (5)
into the mixing tube (4). In the mixing tube (4), the so>called
hydrolysis segment, AdBlue" is injected via the AdBlue" metering
device (A67). The exhaust is redirected in the rear section of the
exhaust aftertreatment unit (1), so that it flows through the SCR
catalytic converter (3) and the ammonia slip catalytic converter (2)
from the rear.
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5 Inlet pipe
6 Outlet pipe
a Exhaust from the engine
– This printout will not be recorded by the update service. Status: 09 / 2011 –
b Exhaust in SCR catalytic converter and
ammonia slip catalytic converter
c Exhaust cleaned (to atmosphere)
F Direction of travel
The exhaust is redirected again at the front side of the exhaust
aftertreatment unit (1) and passes the muffler housing. The
cleaned exhaust is finally emitted into the environment via the
outlet tube (6).
W49.20>1023>75
W49.20>1024>79