GMC 2003 DURAMAX, Руководство пользователя

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Elevated Idle/Exhaust Restrictor
If your vehicle is equipped with the RPO LLY engine, it
has a cold temperature high idle and exhaust restrictor
feature which elevates the engines idle speed from
680 to 1200 rpms, and restricts the exhaust gas flow,
when outside temperatures are below 32°F (0°C),
and the engine coolant temperature is below 150°F
(65°C.) This feature enhances heater performance by
raising the engine coolant temperature faster.
This feature can be turned off and on using the DIC
steering wheel control buttons. If your vehicle is
not equipped with the DIC steering wheel control
buttons, doing the following to turn on this feature:
1. Turn the ignition to the run position, 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.
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 with return to normal once the
following conditions are met:
•
Once engine coolant temperature reaches
150°F (65°C).
•
Air intake temperature reaches 32°F (0°C).
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 automatic transmission is shifted out of
PARK (P) or NEUTRAL (N).
•
The clutch pedal on the manual transmission is
pressed.
•
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.
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