Understanding the Diagnostic Light
The machine is equipped with a diagnostic light, which
indicates if the machine detects a malfunction. The
diagnostic light is located on the InfoCenter, above
the display screen (
). When the machine is
functioning properly and the key switch is moved to the
O
N
/R
UN
position, the diagnostic light turns on briefly to
indicate that the light is working properly. When a machine
advisory message appears, the light illuminates when the
message is present. When a fault message appears, the
light blinks until the fault is resolved.
g021272
Figure 57
1.
Diagnostic light
Diesel Particulate Filter Regeneration
The diesel particulate filter (DPF) is part of the exhaust
system. The diesel-oxidation catalyst of the DPF reduces
harmful gasses and the soot filter removes soot from the
engine exhaust.
The DPF regeneration process uses heat from the engine
exhaust to incinerate the soot accumulated on the soot filter,
converting the soot to ash, and clears the channels of the
soot filter so that filtered engine exhaust flows out the DPF.
The engine computer monitors the accumulation of soot
by measuring the back pressure in the DPF. If the back
pressure is too high, soot is not incinerating in the soot filter
through normal engine operation. To keep the DPF clear of
soot, remember the following:
•
Passive regeneration occurs continuously while the
engine is running—run the engine at full engine speed
when possible to promote DPF regeneration.
•
If the back pressure in the DPF is too high or a reset
regeneration has not occurred for 100 hours, the engine
computer signals you through the InfoCenter when
reset regeneration is running.
•
Allow the reset regeneration process to complete before
shutting off the engine.
Operate and maintain your machine with the function of the
DPF in mind. Engine load at high idle (full throttle) engine
speed generally produces adequate exhaust temperature
for DPF regeneration.
Important:
Minimize the amount of time that you idle
the engine or operate the engine at low-engine speed to
help reduce the accumulation of soot in the soot filter.
DPF Soot Accumulation
•
Over time, the diesel particulate filter accumulates soot
in the soot filter. The computer for the engine monitors
the soot level in the DPF.
•
When enough soot accumulates, the computer informs
you that it is time to regenerate the DPF.
•
DPF regeneration is a process that heats the DPF to
convert the soot to ash.
•
In addition to the warning messages, the computer
reduces the power produced by the engine at different
soot-accumulation levels.
Engine Warning Messages—Soot Accumulation
Indication Level
Fault Code
Engine Power Rating
Recommended Action
Level 1: Engine
Warning
g213866
Figure 58
Check Engine
SPN 3719, FMI 16
The computer de-rates the
engine power to 85%.
Perform a parked regeneration
as soon as possible; refer
to
Regeneration (page 42)
.
Level 2: Engine
Warning
g213867
Figure 59
Check Engine
SPN 3719, FMI 0
The computer de-rates the
engine power to 50%.
Perform a recovery regeneration
as soon as possible; refer
to
Regeneration (page 42)
.
36
