GMC 2005 T-Series Owner's Manual page 44

Manual High Idle System
If your vehicle has this feature, the manual high idle
button is located in the instrument panel. See Instrument
Panel Overview on page 3-4 for more information.
United States
This system can be used to increase your engine idle
speed whenever the following conditions are met:
•
The brake pedal is not pressed.
•
The vehicle is at a complete stop.
•
The manual transmission clutch pedal is not
pressed or, the automatic transmission is in
NEUTRAL (N) or PARK (P).
The manual high idle feature is activated by pressing
the button on the instrument panel. When the button is
pressed again, or any of the previous conditions are
not met, manual high idle will be deactivated.
2-10
Exhaust Restrictor
If your vehicle is equipped with this feature, there is an
exhaust restrictor valve located in the exhaust stream.
The valve closes to provide back pressure to the engine
for the purpose of warming the engine quickly.
The exhaust restrictor operates:
•
•
•
Canada
•
•
The exhaust brake switch must be on. See Diesel
Engine Exhaust Brake on page 2-14 for more
information. The indicator in the exhaust brake switch
will be lit when the exhaust restrictor is active. The
exhaust brake indicator light in the center of the
instrument panel will also be lit whenever the exhaust
restrictor is active. See Exhaust Brake Indicator Light on
page 3-35 for more information.
while the engine is running
while the vehicle is not moving
while the accelerator, brake and clutch pedals are
not pressed on a manual transmission vehicle
while idling or driving in cold temperatures
when the shift lever is in NEUTRAL (N) or PARK (P)
on an automatic transmission vehicle