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292 Exhaust cleaning
must be fulfilled. The conditions vary depending upon
which fault has arisen. There are three different faults
that generate a "non-erasable fault code":
1
Empty AdBlue tank.
2
NOx level exceeding the certified level.
3
The NOx level cannot be monitored.
Non-erasable fault codes
With the new fault codes for NOx once the fault code
has been set (becomes active), the fault code will be
stored for 400 days and will not be erased, even if the
current fault is remedied and the fault code becomes
inactive.
Once a "non-erasable fault code" is generated, an
estimation is made of the amount of time the engine
was running whilst the current fault was active. In this
way, you can obtain information about how long the
engine was running with a fault in the emission
system.
Derating (power reduction)
A new feature for NOx control monitoring process
means that when certain limits occur or a certain fault
arises in the exhaust gas after-treatment system, a
power reduction of 40% will occur. Before derating
occurs, the control and warning lights will light and
the instrument display will inform that derating will
occur. Derating will be activated once the vehicle has
stopped for the first time (with the engine running)
after the occurrence of the fault, for example at the
next red light. As soon as the reason for the power
reduction has ceased, the power reduction will be
deactivated the next time the engine goes to idle.
Power reduction occurs during any of the following
events:
• NOx level exceeding the certified level.
• AdBlue tank empty.
• The system could not monitor the NOx level during
50 hours of engine operation.
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