SHOP MANUAL
Engine
Ch 1 page 30
Starting in the cold, below -11°C
The EEC3 control unit monitors the values and functions of all sensors
The engine is started
The EEC3 control unit opens the coolant valve (3) so that the coolant can heat the reductant tank (1) and re-
ductant pump (11). The EEC3 control unit also activates electrical heating of the reductant hoses (2 and 4) and
the electric heating in the reductant doser (12).
The EEC3 control unit registers, via the temperature sensor in the reductant tank (1) and the reductant doser
(12), when the reductant is at a temperature above -11°C, at which the reductant pump (11) starts.
When the temperature sensor (9) indicates that the temperature of the exhaust gases has reached 200–250°C,
the EEC3 control unit activates the reductant doser (12), which starts injecting reductant to the hydrolysis cata-
lytic converter (6). The dose is determined by the engine control unit on the basis of the combustion control in
the engine which is currently being operated by the engine control unit.
The process in the SCR catalytic converter (8) starts.
Figure 43
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