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A slow (10-second) flash of the high exhaust system
temperature (HEST) lamp, indicates a regeneration is
in progress, and the driver is not controlling the en-
gine idle speed.
A solid illuminated high exhaust system temperature
(HEST) lamp, alerts the operator of high exhaust
temperature during the regeneration process, when
the speed is below 5 mph (8 km/h). See
Fig. 7.1
.
The HEST lamp does not indicate the need for any
kind of vehicle or engine service; it only alerts the
vehicle operator of high exhaust temperatures. The
driver must be careful that the exhaust pipe outlet is
not directed at any person, or at any object or mate-
rial that can be damaged or ignited by the heat.
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 steady yellow DPF lamp indicates that a parked
regen is required soon, and should be scheduled for
the earliest convenient time. See
Fig. 7.2
. A blinking
yellow DPF lamp indicates that a parked regen is
required immediately, or an engine derate may occur.
A solid yellow malfunction indicator lamp (MIL) indi-
cates an engine fault that affects the emissions. See
Fig. 7.3
.
Diesel particulate filter servicing must be performed
by an authorized service facility, 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 request regen switch is located on the dash.
See
Fig. 7.4
. The function of the switch varies by
the engine make and model in the vehicle. See the
engine operation manual for switch operation details.
NOTE: The regen switch can start an active
regen only when the DPF light is illuminated
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
09/25/2006
f610814a
Fig. 7.3, Malfunction Indicator Lamp (MIL)
Engines
7.2