Chevrolet/GMC 2013 DURAMAX Diesel Service Manual Page 28

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Black plate (4,1)
Chevrolet/GMC DURAMAX Diesel Supplement - 2013 - crc - 8/10/12
9-4 Driving and Operating
.
Air intake temperature reaches
0°C (32°F).
The high idle speed will be
temporarily interrupted and the
engine speed will return to normal if
any of the following conditions
occur:
.
The brake pedal is applied.
.
The accelerator pedal is
pressed.
.
The transmission is shifted out
of P (Park) or N (Neutral).
.
Vehicle speed is detected.
Once these inputs are removed, the
engine idle speed will slowly ramp
back up to high idle after the normal
delay, if the conditions for engine
coolant temperature and air intake
temperature are still met.
Fast Idle Control
The vehicle may have this system
which can be used to increase the
engine idle speed.
Fast Idle control will be enabled
when the following conditions
are met:
.
The parking brake is set.
.
The transmission is in P (Park)
or N (Neutral).
.
The vehicle speed is about
0 km/h (0 mph).
.
The cruise control is in the On
position. See Cruise Control in
the owner manual.
.
The cruise control Set switch is
pressed and released for Preset
Fast Idle Speed (1200 rpm).
Fast Idle control will be disabled
when one or more of the following
conditions occur:
.
The cruise control is in the Off
position.
.
The cruise control Set switch is
pressed and released. See
Cruise Control in the owner
manual.
.
The cruise control Cancel switch
is pressed.
.
The brake pedal is pressed.
.
The transmission is shifted out
of P (Park) or N (Neutral).
.
The parking brake is released.
.
The vehicle speed is not
0 km/h (0 mph).
When Fast Idle is active, a FAST
IDLE ON message will be displayed
in the Driver Information Center
(DIC). See Starting the Vehicle
Messages on page 512.
Winter Cover
If the vehicle includes a winter
cover, it can be used to enhance
heater performance in extremely
cold conditions below 18°C (0°F).
The winter cover installs over the
grille and restricts airflow to the
engine compartment.
For diesel powered vehicles that did
not come with a winter cover, a GM
winter cover can be purchased as
an accessory. See your dealer for
additional information.
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