GMC 2003 DURAMAX Manuale utente
Features and Controls ..................................... 2-1
Starting and Operating Your Vehicle ............. 2-2
Instrument Panel ............................................. 3-1
Warning Lights, Gages and Indicators ........... 3-2
Service and Appearance Care .......................... 5-1
Diesel Fuel Requirements and
Fuel System .......................................... 5-2
Checking Things Under the Hood ............... 5-14
Capacities and Specifications ..................... 5-38
Maintenance Schedule ..................................... 6-1
Maintenance Schedule ................................ 6-2
Index ................................................................ 1
2003 DURAMAX™ Diesel Engine M
This manual contains information that pertains to the
operation of your diesel engine. It also contains
your Diesel Maintenance Schedule. The sections in this
manual correspond to the sections in your owner
manual. This manual, along with your owner manual,
will assist you in the proper use and maintenance
of your vehicle.
Keep this manual with the owner manual in your
vehicle, so it will be there if you ever need it while you
are on the road. If you sell your vehicle, leave this
manual and the owner manual with the vehicle.
This manual includes the latest information at the time it
was printed. We reserve the rights to make changes
in the product after that time without notice.
General Motors Corporation. All Rights Reserved.
General Motors, GM, GMC, CHEVROLET, SIERRA and
SILVERADO are registered trademarks of General
Motors Corporation.
Canadian Owners
A French language copy of this manual can be obtained
from your dealer or from:
Helm, Incorporated
P.O. Box 07130
Detroit, MI 48207
Part No. 15063177 First Edition ©Copyright General Motors Corporation 06/24/02
All Rights Reserved
ii
Starting and Operating Your Vehicle .................2-2
Starting Your Diesel Engine .............................2-2 Winter Cover .................................................2-6
Engine Coolant Heater ....................................2-7
Section 2 Features and Controls
2-1
Starting and Operating Your
Vehicle
Starting Your Diesel Engine
Your diesel engine starts differently than a gasoline
engine.
Automatic Transmission
Move your shift lever to PARK (P) or NEUTRAL (N).
Your engine won’t start in any other position — that’s a
safety feature. To restart when you’re already moving,
use NEUTRAL (N) only.
Notice: Do not try to shift to PARK (P) if your
vehicle is moving. If you do, you could damage the
transmission. Shift to PARK (P) only when your
vehicle is stopped.
Manual Transmission
Move your shift lever to neutral and hold the clutch
pedal to the floor while starting the engine. Your
vehicle won’t start if the clutch pedal is not all the way
down — that’s a safety feature.
Starting Your Engine
1. Turn your ignition key to RUN.
Observe the wait to start light. See Wait to Start
Light on page 3-6. This light may not come on if the
engine is hot.
2. As soon as the wait to start light goes off,
IMMEDIATELY turn the ignition key to START.
When the engine starts, let go of the key.
If your vehicle is equipped with the RPO LLY
engine, it has a fast warm-up glow plug system.
The wait to start light will illuminate for a much
shorter time than most diesel engines, due to the
rapid heating of the glow plug system.
2-2
Notice: Holding your key in START for longer than
15 seconds at a time will cause your battery to
be drained much sooner. And the excessive heat
can damage your starter motor.
Notice: If the WAIT TO START light stays on, it
means that your vehicle could have one of several
problems, so you should have it serviced right away.
3. If the engine does not start after 15 seconds of
cranking, turn the ignition key to OFF. Wait
one minute for the starter to cool, then try the
same steps again.
If you’re trying to start your engine after you’ve run out
of fuel, follow the steps in Running Out of Fuel on
page 5-10. See “Diesel Fuel Requirements and Fuel
System”.
When your engine is cold, let it run for a few minutes
before you move your vehicle. This lets oil pressure
build up. Your engine will sound louder when it’s cold.
Notice: If you are not in an idling vehicle and
the engine overheats, you would not be there to
see the overheated engine indication. This could
damage your vehicle. Do not let your engine
run when you are not in your vehicle.
Cold Weather Starting (Diesel Engine)
The following tips will help you get good starting in
cold weather.
Use the recommended engine oil when the outside
temperature drops below freezing. See Engine Oil on
page 5-16. When the outside temperature drops
below 0° F (–18°C), use of the engine coolant heater is
recommended.
If you experience longer cranking times, notice an
unusual amount of exhaust smoke or are at higher
altitudes (over 7,000 ft. or 2 135 m), you may use your
engine coolant heater. See Engine Coolant Heater
on page 2-7.
See “Diesel Fuel Requirements and Fuel System” for
information on what fuel to use in cold weather.
2-3
If Your Diesel Engine Won’t Start
If you’ve run out of fuel, look at Running Out of Fuel
on page 5-10. See “Diesel Fuel Requirements and
Fuel System”.
If you’re not out of fuel, and your engine won’t start,
do this:
Turn your ignition key to RUN. IMMEDIATELY after
the wait to start light goes off, turn the ignition key
to START.
If the light doesn’t go off, wait a few seconds, then try
starting your engine again. And, see your dealer as soon
as you can for a starting system check.
If the light comes on and then goes off and you know
your batteries are charged, but your engine still
won’t start, your vehicle needs service.
If the light does not come on when the engine is cold,
your vehicle needs service.
If your batteries don’t have enough charge to start your
engine, see Battery in the owner’s manual index.
Be sure you have the right oil for your engine, and that
you’ve changed the oil at the proper times. If you
use the wrong oil, your engine may be harder to start.
Be sure you are using the proper fuel for existing
weather conditions. See “Diesel Fuel Requirements and
Fuel System”.
If the engine starts, runs a short time, then stops, your
vehicle needs service.
{CAUTION:
Do not use gasoline or starting “aids” such as
ether, in the air intake. They could damage
your engine. There could also be a fire, which
could cause serious personal injury.
2-4
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.
2-5
Winter Cover
If your vehicle includes a winter cover it will enhance
heater performance and will reduce the amount of time
it takes to warm the inside of your vehicle in extremely
cold conditions (below 0°F (-18°C)). The winter
cover installs over the front bumper of your vehicle and
restricts the air flowing to the engine compartment
by covering the radiator grille.
Usage Guidelines
The winter cover should only be used while operating
your vehicle in extremely cold temperatures. In
these temperatures, the vehicle does not need a large
amount of air to properly cool the engine. During periods
of operation when more airflow is required to cool the
vehicle, the winter cover should not be used. The
following usage guidelines will allow adequate airflow for
proper radiator grille and air cooler performance:
•Do not use the winter cover when temperatures are
expected to be above 32°F (0°C). Use of the cover
in these conditions could cause your vehicle to
overheat. If this happens while the cover is being
used, remove the cover.
•Do not use the winter cover if towing a trailer. The
added power needed to tow a trailer requires the
radiator grille to have full airflow under all conditions.
Your vehicle may overheat if the cover is used
while towing a trailer.
•Do not modify the cover. The winter cover does not
cover some sections of the front of the vehicle
because these openings are needed to provide
enough airflow to the radiator grille and air cooler in
extremely cold temperatures.
2-6
Installation Instructions
The following instructions explain how to install and
remove your vehicle’s winter cover. When installing or
removing the cover please refer to the “Usage
Guidelines” mentioned previously. When you first try to
fit the cover it may appear to be undersized. This is
due to the nature of the special vinyl, which will stretch
during installation to insure a tight fit. For this reason,
the initial installation of the cover is best performed when
the winter cover is warm. If you are required to use a
front license plate, simply cut the black stitches on
the back of the patch.
Grille Cover Installation
1. Pre-bend all the small black tabs into the shape
ofaJ.
2. Remove the four push pins and slide them through
each of the pre-punched tabs.
3. Install the four push pins into the grille.
4. Hook all the tabs to the edge of the grille.
5. Fasten the snaps.
Lower Cover Installation
1. Pre-bend all of the small black tabs into the shape
ofaJ. 2. Fasten each tab to
edge of the bumper,
as illustrated.
To remove the winter cover reverse the steps listed
previously.
Engine Coolant Heater
In very cold weather, 0°F (18°C) or colder, the engine
coolant heater can help. You’ll get easier starting
and better fuel economy during engine warm-up.
Usually, the coolant heater should be plugged in a
minimum of four hours prior to starting your vehicle.
2-7
To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord. The
cord is located in the engine compartment, on the
passenger’s side of the vehicle, near the right
side engine mount.
3. Plug it into a normal, grounded 110-volt AC outlet.
{CAUTION:
Plugging the cord into an ungrounded outlet
could cause an electrical shock. Also, the
wrong kind of extension cord could overheat
and cause a fire. You could be seriously
injured. Plug the cord into a properly grounded
three-prong 110-volt AC outlet. If the cord will
not reach, use a heavy-duty three-prong
extension cord rated for at least 15 amps.
4. Before starting the engine, be sure to unplug and
store the cord as it was before to keep it away
from moving engine parts. If you don’t, it could be
damaged.
How long should you keep the coolant heater plugged
in? The answer depends on the outside temperature.
You may wish to use your coolant heater to improve
ease of starting at temperatures between 0°F (−18°C)
and −20°F (−29°C). Keep the coolant heater plugged in
for a minimum of four hours. However, above −20°F
(−29°C), use of the coolant heater shouldn’t be
necessary. At temperatures below −20°F (−29°C), the
coolant heater should remain plugged in for at least
eight hours. It will not harm either the coolant heater or
the vehicle to leave the coolant heater plugged in
longer than the times stated. Be sure to remove and
store the cord before starting the engine. See “Diesel
Fuel Requirements and Fuel System” for information on
what fuel to use in cold weather.
2-8
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