chassIs InformatIon — 10
22
2 0 0 8 K n I G h t
Active Regeneration:
An active regeneration cycle will be initiated
if exhaust temperatures are not high enough
to regenerate the filter. The motorhome must
be traveling in excess of 20 mph for an active
regeneration cycle to initiate.
During an active
regeneration cycle, diesel
fuel is introduced into the
exhaust system upstream of
the DPF. The fuel will ignite
and super-heat the DPF to
oxidize particulate matter.
The HEST (High Exhaust
System Temperature) dash
light will illuminate when exhaust temperatures
reach 1450º F., indicating that an active
regeneration is underway and exhaust system
temperatures are elevated above normal levels.
These temperature levels may occur for up to 40
minutes. The HEST light will remain on until
the exhaust temperature cools to 650º F., which
may not be until the engine is turned off and
the exhaust system cools before restarting. The
HEST light does not indicate a fault as long as
there are no other active warning lights.
CAUTION
Use extreme caution if parking the
motorhome while the HEST light is on.
The exhaust system and exhaust gas
will be extremely hot to the point of fire
hazard. Do not park the motorhome on
or around anything combustible.
NOTE
If the engine is turned off during an
active regeneration cycle, the cycle will
automatically begin again (if necessary)
when the motorhome is operated at
speeds above 20 mph.
DPF Dash Light:
A DPF (Diesel Particulate
Filter) indicator light on the
dash illuminates when an
active regeneration cycle is
necessary and has not been
able to initiate. Driving the
motorhome above speeds of
20 mph will allow an active
regeneration cycle to initiate. The HEST light
will turn on when exhaust temperatures reach
1450º F, indicating an active regeneration cycle
is underway. Once the DPF is clear of particulate
matter the DPF light will turn off.
DPF Light Warning System:
If the DPF remains clogged, there are four
stages of the DPF light warning system. The
HEST light may illuminate during this sequence,
which indicates that an active regeneration cycle
is underway. This should successfully regenerate
the filter. The only indication that the DPF is
clear and in good working order is the DPF light
turning back off.
Stage One:
The DPF light glows steady.
This means that an active regeneration
cycle is necessary but has not been able
to initiate.
Stage Two:
The DPF light flashes. The
DPF filter is clogged to the point that the
engine will slightly derate (lose power).
Stage Three:
The DPF light flashes and
the Check engine light turns on. The
DPF is clogged to the point that service
is required immediately. The engine will
severely derate at this point.
Stage Four:
The DPF light and Check
Engine lights extinguish and the Stop
Engine light turns on. Turn off the
engine as soon as possible to avoid
severe engine and/or system component
damage. Do not drive the motorhome in
this condition. The DPF will need to be
removed for repair.
lUBrIcatIon maIntenance
Performing regular scheduled maintenance
ensures reliable operation and optimum
service life of the various chassis components.
Completed maintenance brings peace of mind
knowing the various components have received
proper service. Failure to follow maintenance
guidelines, or perform scheduled maintenance,
results in inefficient operation, premature
component wear or component failure resulting
in breakdown.
Maintenance schedules are usually performed
at certain mile or time intervals. When
performing high level procedures, lower level
service should also be performed.
HEST Dash Light
090502
DPF Dash Light
090502
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