Chevrolet Kodiak 2006, Owner'S Manual

Page: 92 / 398

Automatic High Idle System
The automatic high idle feature will engage whenever
you start your vehicle and the engine is below the preset
operating temperature. This will help decrease engine
warm-up time.
On vehicles that have the Caterpillar
®
diesel engine you
may have an exhaust restrictor that will operate in
High Idle mode. The exhaust brake switch must be on
for this feature to operate. See
Diesel Engine Exhaust
Brake on page 2-27 for more information.
Idle speed will then return to normal under any of the
following conditions:
•
The engine reaches the preset operating
temperature or has been operating for at least
10 minutes.
•
The brake pedal is pressed.
•
The manual transmission clutch pedal is pressed
or, if the vehicle has automatic transmission, it is
shifted from NEUTRAL (N) or PARK (P).
•
The vehicle speed exceeds about 5 mph (8 km/h).
•
The throttle is pressed.
Exhaust Restrictor
(Engine Warm-Up)
Exhaust Restrictor
If your vehicle has a DURAMAX
®
7800 or Caterpillar
®
diesel engine, it may have a feature called an Exhaust
Restrictor (NPE), which uses an air actuated valve
in the exhaust system to restrict exhaust gas flow which
enhances the engine and heater warm-up.
Automatic Quick Warm-Up
If your vehicle has with a DURAMAX
®
6600 engine, it
has a feature called an Automatic Quick Warm-Up,
which uses the turbocharger to restrict the exhaust gas
flow which enhances the engine and heater warm-up.
In both systems, exhaust restrictor or automatic
quick warm-up, the cold temperature high idle feature
elevates the engines idle speed, up to 1500 rpm,
and restricts the exhaust gas flow, when outside
temperatures are below 32°F (0°C), and the engine
coolant temperature is below certain levels. This feature
enhances heater performance by raising the engine
coolant temperature faster.
2-22