Page 319 of 398

yellowblue
6-65
NAME CIRCUITS PROTECTED
RH
-HDLP Right-hand Headlamp
(Export only)
RH
-HIBM Right-hand High-beam Headlamp
(Export only)
ECM
-I Ignition Coil, Camshaft Position
Sensor, VCM, Fuel Injectors,
Coil Driver
HORN Horn Relay, Underhood Lamp(s)
LH
-HDLP Left-hand Headlamp
(Export only)
LH
-HIBM Left-hand High-beam Headlamp
(Export only)
FUEL SOL PCM, Fuel Solenoid Driver,
Engine Shutoff Solenoid
IGN
-E Air Conditioning Clutch Relay
ECM
-B Fuel Pump Relay, VCM, PCM,
Fuel Pump and Engine Oil
Pressure Switch
Replacement Bulbs
LAMP OR BULB QTY NUMBER
Sealed Beam Headlamps 2 H6054
Composite Low
-Beam
Headlamps2 6052
Composite High
-Beam
Headlamps2 9005
Front Sidemarker Lamp 2 194
Front Parking and Turn
Lamp4 2357NA
Rear Parking Lamp 2 3057
Rear Stop and Turn Lamp 2 3057
Back
-up Lamp2 3156
Back
-up Lamp2 1156
Rear Parking, Stop, and
Turn Lamp2 1157
CHMSL 2 921
License Plate Lamp 1 194
Underhood Lamp 1 232
Reel Lamp 1 232
Reading Lamps 6
211
-2
Sunshade Vanity Mirror 4 74
Page 320 of 398

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6-66
Capacities and Specifications
Replacement Parts
Replacement part numbers listed in this section are based on the latest information available at the time of printing,
and are subject to change. If a part listed in this manual is not the same as the part used in your vehicle when it was
built, or if you have any questions, please contact your GM dealer.
These specifications are for information only. If you have any questions, see the service manual for the chassis or
refer to the body manufacturer's publications.
See refrigerant charge label under the hood for charge capacity information and requirements.
Engine Identification -- Gasoline Engines
EngineªVORTECº 4300 ªVORTECº 5000 ªVORTECº 5700 ªVORTECº 7400
Type V6 V8 V8 V8
VIN Code W M R J
Fuel System CSFI
1CSFI1CSFI1SFI2
Spark Plug
Gap0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)
Firing Order
1
-6-5-4-3-21-8-4-3-6-5-7-21-8-4-3-6-5-7-21-8-4-3-6-5-7-2
1Central Sequential Fuel Injection
2Sequential Fuel Injection
Page 329 of 398

Scheduled Maintenance
yellowblue
7-5
Short Trip/City Definition
Follow the Short Trip/City Scheduled Maintenance if
any one of these conditions is true for your vehicle:
Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
Most trips include extensive idling (such as frequent
driving in stop
-and-go traffic).
Most trips are through dusty areas.
You frequently tow a trailer or use a carrier on top of
your vehicle.
If the vehicle is used for delivery service, police, taxi
or other commercial application.
One of the reasons you should follow this schedule if
you operate your vehicle under any of these conditions
is that these conditions cause engine oil to break
down sooner.
Short Trip/City Intervals
Every 3,000 Miles (5 000 km): Engine Oil and Filter
Change (or 3 months, whichever occurs first). Chassis
Lubrication (or 3 months, whichever occurs first).
Drive Axle Service (or 3 months, whichever
occurs first).
Every 6,000 Miles (10 000 km): Tire Rotation.
Every 15,000 Miles (25 000 km): Engine Air Cleaner
Filter Inspection, if driving in dusty conditions.
Gasoline Engine Only: Noise Shields Inspection
(GVWR above 10,000 lbs. only). Diesel Engine Only:
Shields and Underhood Insulation Inspection. Diesel
Engine Only: Thermostatically Controlled Engine
Cooling Fan Check (or every 12 months, whichever
occurs first). Diesel Engine Only: Air Intake System
Inspection. Front Wheel Bearing Repack (or at each
brake relining, whichever occurs first).
Every 24,000 Miles (40 000 km): Diesel Engine Only:
Fuel Cap Replacement, if driving in dusty conditions.
(Continued)
Page 331 of 398

Scheduled Maintenance
yellowblue
7-7
Long Trip/Highway Definition
Follow this scheduled maintenance only if none of
the conditions from the Short Trip/City Scheduled
Maintenance are true. Do not use this schedule if the
vehicle is used for trailer towing, driven in a dusty area
or used off paved roads. Use the Short Trip/City
schedule for these conditions.
Driving a vehicle with a fully warmed engine under
highway conditions causes engine oil to break
down slower.
Long Trip/Highway Intervals
Every 7,500 Miles (12 500 km): Engine Oil and Filter
Change (or every 12 months, whichever occurs first).
Chassis Lubrication (or every 12 months, whichever
occurs first). Drive Axle Service. Tire Rotation.
Every 15,000 Miles (25 000 km): Gasoline Engine
Only: Noise Shields Inspection (GVWR above
10,000 lbs. only). Diesel Engine Only: Shields and
Underhood Insulation Inspection. Diesel Engine Only:
Thermostatically Controlled Engine Cooling Fan Check
(or every 12 months, whichever occurs first). Diesel
Engine Only: Air Intake System Inspection.
Every 30,000 Miles (50 000 km): Fuel Filter
Replacement. Engine Air Cleaner Filter Replacement.
Front Wheel Bearing Repack (or at each brake
relining, whichever occurs first).
Every 50,000 Miles (83 000 km): Automatic
Transmission Service (vehicles over 8600 GVWR
or driven under severe conditions or equipped with
diesel engine).
(Continued)
Page 372 of 398

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7-48
Part B: Owner Checks and Services
Listed in this part are owner checks and services which
should be performed at the intervals specified to help
ensure the safety, dependability and emission control
performance of your vehicle.
Be sure any necessary repairs are completed at once.
Whenever any fluids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
in Part D.
At the First 100, 1,000 and 6,000 Miles
(160, 1 600 and 10 000 km)
For vehicles with dual wheels, check dual wheel nut
torque. For proper torque, see ªWheel Nut Torqueº
in the Index.
At Each Fuel Fill
It is important for you or a service station attendant to
perform these underhood checks at each fuel fill.
Engine Oil Level Check
Check the engine oil level and add the proper oil
if necessary. See ªEngine Oilº in the Index for
further details.Engine Coolant Level Check
Check the engine coolant level and add DEX
-COOL
coolant mixture if necessary. See ªEngine Coolantº in
the Index for further details.
Windshield Washer Fluid Level Check
Check the windshield washer fluid level in the
windshield washer tank and add the proper fluid if
necessary. See ªWindshield Washer Fluidº in the Index
for further details.
At Least Once a Month
Tire Inflation Check
Make sure tires are inflated to the correct pressures.
Don't forget to check your spare tire. See ªTiresº in
the Index for further details.
Cassette Deck Service
Clean cassette deck. Cleaning should be done every
50 hours of tape play. See ªAudio Systemsº in the
Index for further details.
Page 373 of 398

yellowblue
7-49 At Least Twice a Year
Restraint System Check
Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors and anchorages are
working properly. Look for any other loose or damaged
safety belt system parts. If you see anything that might
keep a safety belt system from doing its job, have it
repaired. Have any torn or frayed safety belts replaced.
Also look for any opened or broken air bag coverings,
and have them repaired or replaced. (The air bag system
does not need regular maintenance.)
Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace blade
inserts that appear worn or damaged or that streak or
miss areas of the windshield. Also see ªWiper Blades,
Cleaningº in the Index.
Spare Tire Check
At least twice a year, after the monthly inflation check
of the spare tire determines that the spare is inflated to
the correct tire inflation pressure, make sure that the
spare tire is stored securely. Push, pull, and then try to
rotate or turn the tire. If it moves, use the ratchet/wheel
wrench to tighten the cable. See ªStoring the Spare Tire
and Toolsº in the Index.Weatherstrip Lubrication
Silicone grease on weatherstrips will make them last
longer, seal better, and not stick or squeak. Apply
silicone grease with a clean cloth. During very cold,
damp weather more frequent application may be
required. (See ªRecommended Fluids and Lubricantsº
in the Index.)
Automatic Transmission Check
Check the transmission fluid level; add if needed. See
ªAutomatic Transmission Fluidº in the Index. A fluid
loss may indicate a problem. Check the system and
repair if needed.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all hood hinges, hood prop rod pivot, fuel filler
door, rear compartment hinges, latches, locks, hood latch
assembly, secondary latch, pivots, spring anchor, release
pawl and any moving seat hardware. Part D tells you
what to use. More frequent lubrication may be required
when exposed to a corrosive environment.
Page 380 of 398

7-56
USAGEFLUID/LUBRICANT
Rear Axle
(Standard
Differential)SAE 80W-90 Axle Lubricant
(GM Part No. 1052271
or equivalent).
Rear Axle
(Locking
Differential)Axle Lubricant; use only GM
Part No. 1052271. Do not add
friction modifier
.
Propshaft
Splines and
Universal JointsChassis Lubricant (GM Part
No. 12377985 or equivalent) or
lubricant meeting requirements
of NLGI # 2, Category LB
or GC
-LB.
One-Piece
Propshaft SplineSpline Lubricant, Special Lubricant
(GM Part No. 12345879) or
lubricant meeting requirements
of GM 9985830.
USAGEFLUID/LUBRICANT
Hood Latch
Assembly,
Secondary Latch,
Pivots, Spring
Anchor and
Release PawlLubriplate Lubricant Aerosol
(GM Part No. 12346293 or
equivalent) or lubricant meeting
requirements of NLGI # 2,
Category LB or GC
-LB.
Hood HingesMulti-Purpose Lubricant,
Superlube (GM Part
No. 12346241 or equivalent).
Weatherstrip
ConditioningDielectric Silicone Grease (GM
Part No. 12345579 or equivalent).
Weatherstrip
SqueaksSynthetic Grease with Teflon,
Superlube (GM Part
No. 12371287 or equivalent).
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