DPF Ash Accumulation
•
The lighter ash is discharged through the exhaust system; the heavier ash collects in the soot filter.
•
Ash is a residue of the regeneration process. Over time, the diesel particulate filter accumulates ash
that does not discharge with the engine exhaust.
•
The computer for the engine calculates the amount of ash accumulated in the DPF.
•
When enough ash accumulates, the engine computer sends information to the InfoCenter in the form of an
engine fault to indicate the accumulation of ash in the DPF.
•
The fault messages indicate that it is time to service the DPF.
•
In addition to the warnings, the computer reduces the power produced by the engine at different
ash-accumulation levels.
InfoCenter Advisory and Engine Warning Messages—Ash Accumulation
Indication
Level
Fault Code
Engine Speed
Reduction
Engine Power Rating
Recommended Action
Level 1:
Engine
Warning
Check Engine
SPN 3720, FMI 16
None
The computer
de-rates the engine
power to 85%.
Service the DPF; refer
to
Regeneration (page 33)
Level 2:
Engine
Warning
Check Engine
SPN 3720, FMI 0
None
The computer
de-rates the engine
power to 50%.
Service the DPF; refer
to
Regeneration (page 33)
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