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150 STARTING AND OPERATING
1. With the transmission in PARK, the parking
brake applied, and the engine running,
push the On/Off button to the ON position,
then push the SET (-) button.
2. The engine RPM will go up to 1,100 RPM. To
increase the RPM, push and hold the RES
(+) button and the idle speed will increase
to approximately 1,500 RPM. To decrease
the RPM, push and hold the SET (-) button
and the idle speed will decrease to approxi-
mately 1,100 RPM.
3. To cancel the Idle–Up feature, either push
the CANCEL button, push the On/Off button,
or press the brake pedal.
NOISE
Diesel engines can create noises that may
seem concerning. The nature of a diesel engine
is compression ignition where compressed air
and fuel are mixed and ignited. Weather,
barometric pressure, altitude, and temperature
will affect how fuel is ignited in the engine.
Engines will sound different from day to day or
previous model years. Clicking, ticking, or light
knocking is normal and will change from day to
day, as the engine breaks in, and can vary with
changes in ambient temperature. Clicking
sound from under the hood shortly after vehicle
shutdown is normal as actuators such as the
EGR valve are cycled. Fuel pump noise may
increase during low speed/light load conditions
when ambient temperature is above 100°F
(38°C), and when fuel tank level is below 10%
which is a normal condition of the fuel system
and controls strategy. Diesel equipped vehicles
also have an exhaust after-treatment system to
reduce emissions utilizing a Diesel Particulate
Filter (DPF) and a Selective Reduction Catalyst
(SCR). The SCR reduces Nitrogen Oxides (NOx)
using the Diesel Exhaust Fluid (DEF) system.
DEF is injected directly into the SCR through a
dosing module. This process will create a
clicking sound and at times, will make noise
even with the vehicle shut off. This is normal as
the DEF dosing module is purging DEF. If at any
time the check engine light is on, please visit an
authorized dealer.
STOPPING THE ENGINE
Idle the engine a few minutes before routine
shutdown. After full load operation, idle the
engine three to five minutes before shutting it
down. This idle period will allow the lubricating
oil and coolant to carry excess heat away from
the combustion chamber, bearings, internal
components, and turbocharger. This is
especially important for turbocharged, charge
air-cooled engines. Refer to the following chart
for proper engine shutdown:
Driving Condition Load Turbocharger Temperature
Idle Time (min.) Before Engine
Shutdown
Stop and Go Empty Cool Less than One
Stop and Go Medium - One
Highway Speeds Medium Warm Two
21_DJD2_OM_EN_USC_t.book Page 150
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