221
C
ha
ss
is
- 1
0
2012 Trip
DIeSel partIcUlate fIlter
The exhaust system is equipped with a
(Diesel Particulate Filter) DPF to lower
emissions by trapping particulate matter (soot).
Naturally occurring exhaust heat oxidizes
built-up particulates and clears (regenerates)
the filter. This is called passive regeneration. If
heat from passive regeneration is insufficient,
an active regeneration cycle will automatically
initiate during travel. An active regeneration
cycle can also be initiated by the operator
while parked. Dash indicator lamps alert the
operator of the status of the DPF.
CAUTION:
The engine and related components
are designed to use Ultra Low Sulfur
Diesel (ULSD) only. Do not use Low
Sulfur Diesel (LSD) with a DPF
equipped engine. LSD will damage the
DPF.
Passive Regeneration:
Passive regeneration is when heat from
exhaust gas oxidizes particulate matter in the
DPF. Under normal freeway travel, passive
regeneration is usually sufficient to oxidize
particulate matter. However, particulate matter
can accumulate in the DPF where an active
regeneration cycle is necessary to oxidize
particulate matter.
Active Regeneration:
There are two types of active regeneration,
rolling and parked. Both types perform
the same function but under different
circumstances. A rolling active regeneration
occurs automatically while traveling.
A parked active regeneration is initiated
by the operator. Active regeneration injects
fuel into the exhaust system to heat the DPF
until particulate matter is oxidized. Active
regeneration is determined by pressure sensors
located on the DPF. Situations that can lead to
accumulation of particulates are stop and go
driving, short run periods and excess idling.
HEST Lamp:
During active regeneration,
exhaust temperature can raise
to over 1000 degrees Fº. The
HEST (High Exhaust System
Temperature) dash lamp will
illuminate when one of three
thermal exhaust sensors reach 750º F., and the
motorhome is traveling slower than 5 MPH
to warn of elevated exhaust temperature.
The HEST lamp will remain on until exhaust
temperature cools which may not be until the
engine is turned off. Illumination of the HEST
lamp is part of normal operation and does not
indicate a fault as long as there are no other
active indicator lamps.
WARNING:
Use extreme caution if parking the
motorhome while the HEST lamp 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 or flammable. Use
extreme caution not to enter the path
of the exhaust while the HEST lamp is
illuminated. Severe burns can occur.
NOTE:
If the engine is turned off during an
active regeneration cycle, the cycle
will automatically begin again (if
necessary) when the motorhome is
traveling.
DPF Lamp:
A DPF indicator lamp on
the dash illuminates when the
DPF is partially clogged and
restricting exhaust gasses.
Driving the motorhome
(preferably at freeway speed) will allow an
active regeneration cycle to initiate. The DPF
lamp will turn off once backpressure in the
DPF is below specifications.
090502a
Hest lamp
090502a
DPF lamp
Thermal Sensors
Pressure Sensors
Diesel particulate filter
090502a
Summary of Contents for Trip 2012
Page 1: ...2 0 1 2 B YHOL I D A YR A MB L E R O w n e r s Ma n u a l...
Page 13: ...Notes...
Page 45: ...40 Driv ing Safety 2 2012 Trip Weight Record Sheet...
Page 51: ...46 Driv ing Safety 2 2012 Trip Notes...
Page 138: ...133 W ater Sy stems 6 2012 Trip Water System Diagram 040487va...
Page 139: ...134 Wat er Sy stems 6 2012 Trip Notes...
Page 151: ...146 Pro p ane Sy tems 7 2012 Trip Notes...
Page 173: ...168 Ho us e Electr ical 8 2012 Trip Notes...
Page 190: ...185 Chassis Electrical 9 2012 Trip Engine No Start Flow Chart...
Page 191: ...186 Ch as s is Electr ical 9 2012 Trip Notes...
Page 237: ...232 Ch assis 10 2012 Trip Notes...
