This function is used to determine the level of soot in the diesel particulate filter (DPF). This is done by using four different signal/parameters; estimated driving distance since last aftertreatment DPF regeneration, the time since last regeneration, fuel consumption and the aftertreatment DPF pressure. When this diagnostic trouble code (DTC) is set the filter needs servicing due to high level of soot or the aftertreatment DPF regeneration process does not function properly.
Conditions for diagnostic trouble code (DTC):
1) Critically high soot load
2) Aftertreatment diesel particulate filter (DPF) soot load ratio more than 170 %
Observable symptoms
1) Low Power
Probable cause
1) Aftertreatment Hydrocarbon Doser
2) Catalyst
3) Regeneration process is not functioning
4) Regeneration inhibited, driver has not allowed regeneration to take place
Detailed information
1) Activation
2) High derate with potentional engine shutdown
3) EGR valve commanded closed
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