be noticeable at speeds below 20 mph (32 kmh). This
operating mode may last for up to an hour of idle time, or
around 20 minutes of driving time.
Your truck may have been ordered with an optional
voltage monitoring idle up feature. If a load is placed on
the electrical system while the truck is in park, this feature
will attempt to maintain normal system voltage by auto-
matically increasing engine idle speed. You may notice
several consecutive increases in idle speed, up to a maxi-
mum of 1450 RPM, as the system will attempt to utilize the
smallest increase in idle speed necessary to maintain
normal system voltage. The idle speed will return to
normal when either the electrical load is removed, or when
the brake pedal is applied.
NOTE: For instrument cluster display messages related to
the vehicle’s exhaust system, refer to “Instrument Cluster
Display” in “Understanding Your Instrument Panel” for
further information.
Idle-Up Feature — Automatic Transmission Only
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 1100 RPM. To increase the
RPM, push and hold the ACCEL/RESUME switch and
the idle speed will increase to approximately 1500 RPM.
To decrease the RPM, push and hold the DECEL switch
and the idle speed will decrease to approximately
1100 RPM.
3. To cancel the Idle–Up feature, either push the CANCEL
switch, push the ON/OFF switch, or press the brake
pedal.
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.
134 STARTING AND OPERATING
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