Engine
SHOP MANUAL
Ch 1 page 25
Control system for exhaust gas aftertreatment
Overview - Exhaust gas aftertreatment system structure and components
Exhaust gas aftertreatment is made up of the electronic control system for exhaust gas aftertreatment, EEC
(Exhaust Emission Control system), with sensors and electrical components such as the reductant pump
and reductant doser. Together with components such as catalytic converters, reductant tank and electrically
heated reductant hoses, the exhaust gases are cleaned to remove harmful substances.
Control system for exhaust gas aftertreatment
The control system consists of a control unit (EEC3), NOx sensor, temperature sensor for exhaust gases,
level and temperature sensor in the reductant tank, reductant pump, reductant doser, coolant valve and elec-
trically heated reductant hoses.
1 Control unit EEC3
2 Coolant valve
3 Temperature sensor
4 Level and temperature sensor
in reductant tank
5 Electrically heated reductant
hoses
6 Reductant pump
7 Reductant doser
8 NOx sensor
Control unit EEC3 (E67)
The EEC3 control unit retrieves data from the system’s sensors and components. EEC3 communicates with the
engine control unit EMS. EMS decides on what measures are to be executed, e.g. what quantity of reductant is
to be metered to the exhaust gases, and notifies EEC3. The EEC3 control unit is independently responsible for
the functions which supply reductant to the exhaust gases.
The EEC3 control unit is located on the reductant tank bracket underneath the reductant tank.
Figure 38
To Next Page
Loading...