Black plate (4,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 6/5/14
9-4
Driving and Operating
To turn this feature on or off:
1. Turn the ignition to ON/RUN,
with the vehicle off.
2. Press the accelerator pedal to
the floor and hold while quickly
pressing the brake pedal three
times in less than eight seconds.
3. Release the accelerator pedal
and start the engine.
If this method is not available, see
the alternate method under Truck
Models in
Vehicle Personalization
(Truck Models) on page 5-16
or
Vehicle Personalization (Van
Models) on page 5-18
.
On van models, this feature can
also be turned on and off using the
DIC buttons.
When the engine is started, it will
slowly ramp up to the high idle
speed after a delay of a few
seconds up to approximately
two minutes. For this method to
work properly there must be no
throttle or brake pedal faults.
The engine idle speed will return to
normal once the following conditions
are met:
.
Engine coolant temperature
reaches 65°C (150°F).
.
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 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 Set switch is
pressed and released. See
“
Cruise Control
”
in the owner
manual.
.
The cruise control Cancel switch
is pressed.
