2004 CHEVROLET IMPALA engine

Underhood Fuse Block (Upper)
Some fuses are in a fuse block in the engine
compartment on the passenger’s side of the vehicle.
SeeEngine Compartment Overview on page 5-12
for more information on location.
Relays Usage
FUEL PUMP Fuel Pump
DRL RELAY Daytime Running Lamps
Relays Usage
CRANK RLY Starter (Crank) Relay
HORNS Horn
FOG LTS Fog Lamps
Fuses Usage
LEFT I/P Left Fuse Block
RT I/P #1 Right Fuse Block (Battery)
RT I/P #2 Right Fuse Block (Battery)
U/HOOD #1 Underhood (Top) Fuse Block
HORN RLY Horn Relay
BLANK Blank
BLANK Blank
FOG RLY Fog Lamps Relay
F/PMP RLY Fuel Pump Relay
DRL/EXIT LTSLow (Left Front) & High
(Left Front) Headlamps
EXT LTSLow (Right Front) & High
(Right Front) Headlamps
PCM PCM Battery
A/C RLY
(COMP)HVAC Compressor Relay &
Generator
BLOWER
MOTORHVAC Blower Motor
5-108

Underhood Fuse Block (Lower)
Some fuses are in a fuse block in the engine
compartment on the passenger’s side of the vehicle.
SeeEngine Compartment Overview on page 5-12
for more information on location.
Relays Usage
FAN CONT #3Secondary Cooling Fan
(Passenger’s Side)
FAN CONT #2 Cooling Fan Control Relay
Relays Usage
FAN CONT #1 Primary Cooling fan (Driver’s Side)
IGN RELAY Ignition Relay
A/C CMPR HVAC Compressor
Fuses Usage
IGN SW Ignition Switch
RT I/P #3 Rear Defogger, Audio System
U/HOOD #2 Ignition Relay, AIR Pump
COOLING
FANSCooling Fans (Battery)
FAN CONT
#2Cooling Fan Control Relays #2 & #3
FAN CONT #1 Cooling Fan Control Relays #1
FUEL INJ Fuel Injectors
TRANS SOL Transmission Solenoids
A/C RLY
(COIL)HVAC Control Relay
ENG DEVICESCanister Purge Solenoid, Mass Air
Flow Sensor (MAF), AIR Pump
Relay & Valve Control
DFI MDL Direct Fire Ignition Module
OXY SENOxygen Sensor (Pre and Post
Converter)
5-109

Capacities and Specications
Please refer toRecommended Fluids and Lubricants on page 6-12for more information.
ApplicationCapacities
English Metric
Air Conditioning Refrigerant R-134a 2.4 lbs 1.1 kg
Automatic Transaxle
Pan Removal and Replacement
After Complete Overhaul
When draining/replacing converter, more uid may be
needed.7.4 quarts
10 quarts7.0 L
9.5 L
Cooling System Including Reservoir
3400 (Code E) V6
3800 (Code K) V6
3800 Supercharged (Code 1) V611.3 quarts
11.7 quarts
11.7 quarts10.7 L
11.0 L
11.0 L
Engine Oil with Filter
3400 (Code E) V6
3800 (Code K) V6
3800 Supercharged (Code 1) V64.0 quarts
4.5 quarts
4.5 quarts3.8 L
4.2 L
4.2 L
Fuel Tank 17.0 gallons 64.0 L
All capacities are approximate. When adding, be sure to ll to the approximate level, as recommended in this
manual. SeeRecommended Fluids and Lubricants on page 6-12.
5-110

Engine Specications
Engine VIN Code Transmission Spark Pug Gap
3400 (LA1) V6 E Automatic 0.060 inches (1.52 mm)
3800 (L36) V6 K Automatic 0.060 inches (1.52 mm)
3800 Supercharged (L67) V6 1 Automatic 0.060 inches (1.52 mm)
5-111

Maintenance Schedule......................................6-2
Introduction...................................................6-2
Maintenance Requirements..............................6-2
Your Vehicle and the Environment....................6-2
Using Your Maintenance Schedule....................6-2
Scheduled Maintenance...................................6-4
Additional Required Services............................6-6
Maintenance Footnotes...................................6-7Owner Checks and Services............................6-9
At Each Fuel Fill............................................6-9
At Least Once a Month...................................6-9
At Least Once a Year...................................6-10
Recommended Fluids and Lubricants...............6-12
Normal Maintenance Replacement Parts..........6-13
Engine Drive Belt Routing..............................6-14
Maintenance Record.....................................6-15
Section 6 Maintenance Schedule
6-1

Maintenance Schedule
Introduction
Important: Keep engine oil at the proper level and
change as recommended.
Have you purchased the GM Protection Plan? The Plan
supplements your new vehicle warranties. See your
Warranty and Owner Assistance booklet or your dealer
for details.
Maintenance Requirements
Notice:Maintenance intervals, checks, inspections,
replacement parts and recommended uids and
lubricants as prescribed in this manual are
necessary to keep your vehicle in good working
condition. Any damage caused by failure to follow
scheduled maintenance may not be covered by
warranty.
Your Vehicle and the Environment
Proper vehicle maintenance not only helps to keep your
vehicle in good working condition, but also helps the
environment. All recommended maintenance is
important. Improper vehicle maintenance can even
affect the quality of the air we breathe. Improper uid
levels or the wrong tire ination can increase the level of
emissions from your vehicle. To help protect our
environment, and to keep your vehicle in good condition,
be sure to maintain your vehicle properly.
Using Your Maintenance Schedule
We at General Motors want to help you keep your
vehicle in good working condition. But we do not know
exactly how you will drive it. You may drive very
short distances only a few times a week. Or you may
drive long distances all the time in very hot, dusty
weather. You may use your vehicle in making deliveries.
Or you may drive it to work, to do errands or in many
other ways.
Because of all the different ways people use their
vehicles, maintenance needs vary. You may need more
frequent checks and replacements. So please read
the following and note how you drive. If you have any
questions on how to keep your vehicle in good condition,
see your GM Goodwrench dealer.
6-2

Scheduled Maintenance
When the CHANGE ENGINE OIL message comes on, it
means that service is required for your vehicle. Have your
vehicle serviced as soon as possible within the next
600 miles (1 000 km). It is possible that, if you are driving
under the best conditions, the engine oil life system may
not indicate that vehicle service is necessary for over a
year. However, your engine oil and lter must be changed
at least once a year and at this time the system must be
reset. Your GM Goodwrench dealer has GM-trained
service technicians who will perform this work using
genuine GM parts and reset the system.
If the engine oil life system is ever reset accidentally,
you must service your vehicle within 3,000 miles
(5 000 km) since your last service. Remember to reset
the oil life system whenever the oil is changed. See
Engine Oil on page 5-18for information on the Engine
Oil Life System and resetting the system.When the change engine oil message appears, certain
services, checks and inspections are required.
Required services are described in the following for
“MaintenanceI” and “MaintenanceII.” Generally,
it is recommended that your rst service be
MaintenanceI, your second service be MaintenanceII
and that you alternate MaintenanceIand MaintenanceII
thereafter. However, in some cases, MaintenanceII
may be required more often.
MaintenanceI— Use MaintenanceIif the change
engine oil message comes on within ten months since
vehicle was purchased or MaintenanceIIwas
performed.
MaintenanceII— Use MaintenanceIIif the previous
service performed was MaintenanceI. Always use
MaintenanceIIwhenever the message comes on ten
months or more since the last service or if the message
has not come on at all for one year.
6-4

Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. Reset oil life system. SeeEngine Oil on
page 5-18.An Emission Control Service.••
Visually check for any leaks or damage.See footnote (k).••
Inspect engine air cleaner lter. If necessary, replace lter. SeeEngine Air
Cleaner/Filter on page 5-25.An Emission Control Service. See footnote †.••
Rotate tires and check ination pressures and wear. SeeTires on page 5-64.••
Inspect brake system.See footnote (a).••
Check engine coolant and windshield washer uid levels and add uid as
needed.••
Perform any needed additional services. See “Additional Required Services” in
this section.••
Inspect suspension and steering components.See footnote (b).•
Inspect engine cooling system.See footnote (c).•
Inspect wiper blades.See footnote (d).•
Inspect restraint system components.See footnote (e).•
Lubricate body components.See footnote (f).•
Check transaxle uid level and add uid as needed.•
Replace passenger compartment air lter (if equipped).See footnote (g).•
Inspect throttle system.See footnote (j).•
6-5