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226 STARTING AND OPERATING
Idle-Up Feature
The driver-controlled high idle speed feature will
help increase cylinder temperatures and
provide additional cab heat, however, excessive
idling may still cause the exhaust
aftertreatment system to not properly
regenerate. Extended periods of idle time
should be avoided.
The Idle-Up feature uses the Speed Control
switches to increase engine idle speed and
quickly warm the vehicle's interior.
1. With the transmission in PARK, the parking
brake applied, and the engine running,
push the speed control switch to the ON
position, then push the SET switch.
2. The engine RPM will go up to 1,100 RPM.
To increase the RPM, push and hold the
ACCEL/RESUME switch and the idle speed
will increase to approximately 1,500 RPM.
To decrease the RPM, push and hold the
DECEL switch and the idle speed will
decrease to approximately 1,100 RPM.
3. To cancel the Idle–Up feature, either push
the CANCEL switch, push the ON/OFF
switch, 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 DPF (refer to
“Odor” in this section for further information)
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.
20_DJD2_OM_EN_USC_t.book Page 226
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