high idle speed is being controlled by the engine
software, not the driver.
A steadily illuminated high temperature (HEST) lamp
alerts the operator of high exhaust temperature dur-
ing the regeneration process, if vehicle speed is
below 5 mph (8 km/h). See Fig. 7.1. The HEST lamp
does not signify the need for any kind of vehicle or
engine service; it only alerts the vehicle operator of
high exhaust temperatures. Make sure the engine
exhaust pipe outlet is not directed at any person, or
at any surface or material that will melt, burn, or
explode.
WARNING
Active regeneration can occur automatically any-
time the vehicle is moving. The exhaust gas tem-
perature could reach 1500°F (800°C), which is hot
enough to cause a fire, heat damage to objects
or materials, or personal injury to persons near
the exhaust outlet. See
Regen-Inhibit Switch
later
in this chapter for instructions on preventing au-
tomatic regen if necessary.
The exhaust temperature can remain high even
after the vehicle has stopped. When stopping the
vehicle shortly after an automatic regen, ensure
the exhaust outlets are directed away from struc-
tures, trees, vegetation, flammable materials, and
anything else that may be damaged or injured by
exposure to high heat.
A steadily illuminated yellow diesel particulate filter
(DPF) lamp indicates that a regen may be required
soon. Bring the vehicle to highway speeds to allow
for an active regen, or a parked regen should be
scheduled for the earliest convenient time. See
Fig. 7.2. A DPF lamp blinking at the same time as a
steadily illuminated yellow Check Engine lamp, indi-
cates that a parked regen must be performed imme-
diately, or an engine derate will occur. If the red Stop
Engine lamp illuminates with the blinking DPF lamp
and the Check Engine lamp, a parked regen must
occur or an engine shutdown will occur. Park the ve-
hicle and perform a parked regen. See Fig. 7.3.
A solid yellow malfunction indicator lamp (MIL) indi-
cates an engine fault that affects the emissions. See
Fig. 7.4.
When diesel particulate filter servicing is needed, it
must be performed by an authorized technician, and
a record must be maintained for warranty purposes.
The record must include:
•
date of cleaning or replacement;
•
vehicle mileage;
•
particulate filter part number and serial number.
The regen switch (Fig. 7.5), located on the dash, is
used to initiate a parked regen of the aftertreatment
device.
09/25/2006 f610816a
Fig. 7.1, High Exhaust System Temperature (HEST)
Lamp
09/25/2006 f610815a
Fig. 7.2, Diesel Particulate Filter (DPF) Status Lamp
03/20/2008 f611000
123
CHECK
STOP
1. Stop Engine Override Switch
2. Amber Check Engine Warning Lamp
3. Red Stop Engine Lamp
Fig. 7.3, Engine Lamps
Engines and Clutches
7.2
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