2.
Start and warm the engine until the coolant tem-
perature is at least 150°F (66°C).
3.
Lift the regen request switch guard and press
and hold the yellow button for five seconds. As
the regen process is initiated, engine rpm in-
creases and the HEST lamp illuminates to indi-
cate extremely high exhaust temperatures.
IMPORTANT: The driver must remain with the
vehicle during the entire regen cycle.
4.
The regen cycle will finish after 20 to 60 minutes,
at which time engine idle speed drops to normal
and the vehicle can be driven normally. The
HEST lamp is extinguished when vehicle speed
exceeds 5 mph (8 km/h) or the system has
cooled to normal operating temperature.
5.
To stop a parked regen at any time during the
process:
•
depress the clutch pedal, brake pedal, or
accelerator pedal;
•
press and hold the regen inhibit switch until
idle returns to normal;
•
shut down the engine.
ATS Warning Lamps
There are three warning lamps that alert the driver of
high exhaust temperature, the need to perform a
parked regen or service the DPF, or of an engine
fault that affects emissions. A decal attached to the
driver’s sun visor explains the ATS warning lamps.
See
for an explanation of the ATS warnings,
and actions required to avoid engine protection se-
quences.
Malfunction Indicator Lamp (MIL)
A steadily illuminated yellow malfunction indicator
lamp (MIL) indicates an engine fault that affects
emissions. See
DPF Status Lamp
When soot accumulates in the DPF and the DPF sta-
tus lamp illuminates, see
, perform a parked
regen or bring the vehicle up to highway speed to
increase the load (thus starting an active regen).
If the DPF status lamp blinks while the CHECK en-
gine lamp is illuminated, initiate a parked regen im-
mediately in order to prevent an engine derate.
If the red STOP engine lamp illuminates with the
blinking DPF lamp and the CHECK engine lamp,
begin a parked regen in order to prevent an engine
shutdown. Park the vehicle and perform a parked
regen.
High Exhaust System Temperature
(HEST) Lamp
Slow (10-second) flashing of the high exhaust sys-
tem temperature (HEST) lamp indicates that a
parked regen is in progress, and the engine’s high
idle speed is being controlled by the engine software,
not the vehicle driver.
Steady illumination of the HEST lamp alerts the
driver of high exhaust temperature during the regen
process if the vehicle speed is below 5 mph (8 km/
h), or during a parked regen. See
Maintenance
Authorized service facilities must perform any DPF
service. For warranty purposes, maintain a record
that includes:
•
date of cleaning or replacement;
•
vehicle mileage;
•
particulate filter part number and serial number.
Diesel Exhaust Fluid and Tank,
EPA10 and Newer Engines
Diesel Exhaust Fluid
Diesel exhaust fluid (DEF) is used in the ATS to
lower NOx in the exhaust stream. DEF is colorless
and close to odorless (it may have a slightly pungent
odor similar to ammonia). It is nontoxic, nonflam-
mable, and biodegradable. It is mildly corrosive to
aluminum, but does not affect the strength or struc-
ture of the aluminum.
White crystals may be noticeable around compo-
nents that come into contact with DEF. The crystals
are easily removed with water.
DEF consumption varies depending on ambient con-
ditions and vehicle application.
Freezing Conditions
DEF freezes to slush at around 12°F (-11°C). It is not
damaged or destroyed if frozen, and is fully usable
when thawed. The DEF in the tank is allowed to
freeze while a vehicle is non-operational. At start-up,
Engines
7.3
