2003 Hyundai Sonata engine

5- 2 VEHICLE MAINTENANCE REQUIREMENTS
F010D01A-AATGeneral Checks
These are the regular checks you should per-
form when you drive your Hyundai or you fill the
fuel tank. A list of these items will be found on
page 6-4.
F010C01A-AATSpecified Scheduled Procedures
These are the procedures such as inspections,
adjustments and replacements that are listed in
the maintenance charts starting on page 5-4.
These procedures must be performed at the
intervals shown in the maintenance schedule to
assure that your warranty remains in effect.
Although it is strongly recommended that they
be performed by the trained technicians at your
Hyundai dealer, these procedures may be per-
formed at any qualified service facility.
It is suggested that genuine Hyundai service
parts be used for any required repairs or re-
placements. Other parts of equivalent quality
such as engine oil, engine coolant, manual or
auto transaxle oil, brake fluid and so on which
are not supplied by Hyundai Motor Company or
its distributor may be used without affecting
your warranty coverage but you should always
be sure these are equivalent to the quality of the
original Hyundai parts. Your Owner's Hand-
book provides further information about your
warranty coverage.
F010A01A-AATMAINTENANCE INTERVALS
Service Requirements
To ensure that you receive the greatest number
of miles of satisfying operation from your Hyundai,
certain maintenance procedures must be per-
formed. Although careful design and engineer-
ing have reduced these to a minimum, those that
are required are of the utmost importance.
It is your responsibility to have these mainte-
nance procedures performed to comply with
the terms of the warranties covering your new
Hyundai. The Owner's Handbook supplied with
your new vehicle provides further information
about these warranties.
F010B01A-AATMaintenance Requirements
The maintenance required for your Hyundai
can be divided into three main areas:
o Specified scheduled procedures
o General checks
o Do-it-yourself maintenance
F010E01A-AATDo-It-Yourself Maintenance
If you are mechanically inclined, own a few tools
that are required and want to take the time to do
so, you can inspect and service a number of
items. For more information about doing it your-
self, see Section 6.
F010F01A-AATA Few Tips
o Whenever you have your Hyundai serviced,
keep copies of the service records in your
glovebox. This will help ensure that you can
document that the required procedures have
been performed to keep your warranties in
effect. This is especially important when
service is not performed by an authorized
Hyundai dealer.
o If you choose to do your own maintenance
and repairs, you may find it helpful to have
an official Hyundai Shop Manual. A copy of
this publication may be purchased at your
Hyundai dealer's parts department.

5- 4 VEHICLE MAINTENANCE REQUIREMENTS
F030A01A-AATSCHEDULED MAINTENANCE
The following maintenance services must be performed to ensure good emission control and performance. Keep receipts for all vehicle emission services
to protect your warranty. Where both mileage and time are shown, the frequency of service is determined by whichever occurs first.
DESCRIPTION
EMISSION CONTROL ITEMS
ENGINE OIL AND FILTER
FUEL FILTER
FUEL LINES, FUEL HOSES AND CONNECTIONS
VACUUM AND CRANKCASE VENTILATION HOSES
VAPOR HOSE AND FUEL FILLER CAP
AIR CLEANER FILTER
SPARK PLUGS (PLATINUM COATED) No.
1
2
3
4
5
6
7MILES X 1000
KILOMETERS X 1000
MONTHS7.5
12
6
R15
24
12
R22.5
36
18
R30
48
24
R
I
I
R37.5
60
30
R45
72
36
R52.5
84
42
R
R
I60
96
48
R
I
I
R
R67.5
108
54
R75
120
60
R82.5
132
66
R90
144
72
R
I
I
R97.5
156
78
R105
168
84
R
R
I112.5
180
90
R120
192
96
R
I
I
R
R127.5
204
102
R135
216
108
R142.5
228
114
R150
240
120
R
I
I
R
F030B02Y-AATR :Replace I : Inspect and, after Inspection, clean, adjust, repair or replace if necessary.

5- 6 VEHICLE MAINTENANCE REQUIREMENTS
SEVERE DRIVING CONDITIONSA - Repeated short distance driving
B - Extensive idling
C - Driving in dusty, rough roads
D - Driving in areas using salt or other corrosive materials or in
very cold weather
E - Driving in sandy areas
F040A04Y-AATMAINTENANCE UNDER SEVERE USAGE CONDITIONS
The following items must be serviced more frequently on cars normally used under severe driving conditions. Refer to the chart below for the appropriate
maintenance intervals.
R : Replace I : Inspect and, after inspection, clean, adjust, repair or replace if necessary
F - More than 50% driving in heavy city traffic during hot weather
above 90°F (32°C)
G - Driving in mountainous areas
H - Towing a trailer
I - Driving for patrol car, taxi or commercial car and vehicle towing
J - Driving over 100 mph ENGINE OIL AND FILTER
AIR CLEANER FILTER
SPARK PLUGS
BRAKE PADS, CALIPERS AND ROTORS
REAR BRAKE DRUMS/LININGS,
PARKING BRAKE
STEERING GEAR BOX, LINKAGE & BOOTS/
LOWER ARM BALL JOINT, UPPER ARM BALL JOINT
DRIVESHAFTS AND BOOTS
MANUAL TRANSAXLE OIL
AUTOMATIC TRANSAXLE FLUID AND FILTER
AIR FILTER (FOR EVAP. AND BLOWER UNIT)
MAINTENANCE ITEM
R
R
R
I
I
I
I
R
R
RVERY 3,000 MILES (4,800 KM) OR 3 MONTHS
MORE FREQUENTLY
MORE FREQUENTLY
MORE FREQUENTLY
MORE FREQUENTLY
MORE FREQUENTLY
EVERY 7,500 MILES (12,000 KM) OR 6 MONTHS
EVERY 60,000 MILES (96,000 KM)
EVERY 30,000 MILES (48,000 KM)
MORE FREQUENTLY
DRIVING
CONDITION MAINTENANCE
INTERVALS MAINTENANCE
OPERATION
A, B, C, F, H
C, E
B, H
C, D, G, H
C, D, G, H
C, D, E, F, G
C, E, F
A, C, D, E, F, G, H, I, J
A, C, E, F, G, H, I
C, E

VEHICLE MAINTENANCE REQUIREMENTS 5- 7
F060G01A-AATo Vapor Hose and Fuel Filler Cap
The vapor hose and fuel filler cap should be
inspected at those intervals specified in the
maintenance schedule. Make sure that a new
vapor hose or fuel filler cap is correctly re-
placed.
F060D01A-AATo Fuel Lines, Fuel Hoses and Connec-
tions
Check the fuel lines, fuel hoses and connec-
tions for leakage and damage. Have a trained
technician replace any damaged or leaking
parts immediately.
F060A01A-AATEXPLANATION OF SCHEDULED MAIN-
TENANCE ITEMS
F060B02A-AATo Drive Belts
Inspect all drive belts for evidence of cuts,
cracks, excessive wear or oil saturation and
replace if necessary. Drive belts should be
checked periodically for proper tension and
adjusted as necessary.
F060M01A-AATo Engine Oil and Filter
The engine oil and filter should be changed at the
intervals specified in the maintenance sched-
ule. If the car is being driven in severe condi-
tions, more frequent oil and filter changes are
required.
F060C01A-AATo Fuel Filter
A clogged filter can limit the speed at which the
vehicle may be driven, damage the emission
system and cause hard starting. If an exces-
sive amount of foreign matter accumulates in
the fuel tank, the filter may require replacement
more frequently.
After installing a new filter, run the engine for
several minutes, and check for leaks at the
connections. Fuel filters should be installed by
trained technicians.
F060F01A-AATo Vacuum, Crankcase
Ventilation Hoses
Inspect the surface of hoses for evidence of
heat and/or mechanical damage. Hard and
brittle rubber, cracking, tears, cuts, abrasions,
and excessive swelling indicate deterioration.
Particular attention should be paid to examine
those hose surfaces nearest to high heat
sources, such as the exhaust manifold.
Inspect the hose routing to assure that the
hoses do not come in contact with any heat
source, sharp edges or moving component
which might cause heat damage or mechanical
wear. Inspect all hose connections, such as
clamps and couplings, to make sure they are
secure, and that no leaks are present. Hoses
should be replaced immediately if there is any
evidence of deterioration or damage.
F070C01A-AATo Coolant
The coolant should be changed at the intervals
specified in the maintenance schedule.
F060E01A-AATo Timing belt
Inspect all parts related to the timing belt for
damage and deformation. Replace any dam-
aged parts immediately.
F060J01A-AAT
o Spark plugs
Make sure to install new spark plugs of the
correct heat range.
F060H01A-AATo Air cleaner filter
A Genuine Hyundai air cleaner filter is recom-
mended when filter is replaced.

5- 8 VEHICLE MAINTENANCE REQUIREMENTS
F070M01Y-AATo Steering Gear Box, Linkage & Boots/
Lower Arm Ball Joint, Upper Arm Ball
Joint
With the vehicle stopped and engine off, check
for excessive free-play in the steering wheel.
Check the linkage for bends or damage. Check
the dust boots and ball joints for deterioration,
cracks, or damage. Replace any damaged
parts.
F070G02A-AATo Brake Fluid
Check brake fluid level in the brake fluid reser-
voir. The level should be between "MIN" and
"MAX" marks on the side of the reservoir. Use
only hydraulic brake fluid conforming to DOT 3
or DOT 4.
F070D01A-AATo Manual transaxle oil
Inspect the manual transaxle oil according to
the maintenance schedule.
NOTE:If the oil level is low, check for possible leaks
before adding oil. Do not overfill.
F070F01A-AATo Brake Hoses and Lines
Visually check for proper installation, chafing,
cracks, deterioration and any leakage. Replace
any deteriorated or damaged parts immedi-
ately.
F070E04A-AATo Automatic Transaxle Fluid and Filter
The fluid level should be in the "HOT" range of
the dipstick, after the engine and transaxle are
at normal operating temperature. Check the
automatic transaxle fluid level with the engine
running and the transaxle in neutral, with the
parking brake properly applied. Use Genuine
Hyundai ATF or DIAMOND ATF SP-III or SK
ATF SP-III when adding or changing fluid.
F070K01A-AATo Exhaust Pipe and Muffler
Visually inspect the exhaust pipes, muffler and
hangers for cracks, deterioration, or damage.
Start the engine and listen carefully for any
exhaust gas leakage. Tighten connections or
replace parts as necessary.
F070J01A-AAT
o Brake Pads, Calipers and Rotors
Check the pads for excessive wear, discs for
run out and wear, and calipers for fluid leakage.
F070H01A-AAT
o Rear Brake Drums and Linings/
Parking Brake
Check the rear brake drums and linings for
scoring, burning, leaking fluid, broken parts,
and excessive wear. Inspect the parking brake
system including the parking brake lever and
cables. For detailed service procedures, refer
to the Shop Manual.
F070L01A-AAT
o Suspension Mounting Bolts
Check the suspension connections for loose-
ness or damage. Retighten to the specified
torque.

6. Do-It-Yourself Maintenance
Engine compartment ........................................................................ 6-2
General checks ................................................................................ 6-4
Checking the engine oil .................................................................... 6-5
Changing the oil and filter ................................................................. 6-6
Checking and changing the engine coolant ...................................... 6-7
Spark plugs ...................................................................................... 6-9
Changing the air cleaner filter ......................................................... 6-11
Checking the transaxle oil (Manual) ............................................... 6-12
Checking the transaxle fluid (Automatic) ....................................... 6-13
Checking the brakes ...................................................................... 6-14
Air conditioning care ....................................................................... 6-15
Checking drive belts ...................................................................... 6-18
Checking and replacing fuses ........................................................ 6-18
Replacement of bulbs .................................................................... 6-21
Junction Box description ................................................................ 6-29
6

6- 2 DO-IT-YOURSELF MAINTENANCE
1. Engine oil filler cap
2. Brake Booster
3. Brake fluid reservoir
4. Clutch fluid reservoir (If installed)
5. Under hood junction box 6. Windshield washer fluid reservoir
7. Power steering fluid reservoir
8. Engine oil level dipstick
9. Engine cover
G010A02Y-GATENGINE COMPARTMENT (2.4 DOHC)
10.Automatic transaxle fluid level dipstick
(If installed)
11.Radiator cap
12.Air cleaner
13.Coolant reservoir cap
14.Battery
HEF-064
12345
6 7 8 9 10 11 12 13 14

DO-IT-YOURSELF MAINTENANCE 6- 3
1. Air cleaner
2. Brake fluid reservoir
3. Brake booster
4. Windshield washer fluid reservoir
5. Power steering fluid reservoir6. Engine oil level dipstick
7. Engine cover
8. Engine oil filler cap
9. Automatic transaxle fluid level dipstick
(If installed)
G010B03Y-AATENGINE COMPARTMENT (2.7 V6 Delta)
10.Radiator cap
11.Battery
12.Coolant reservoir cap
13.Under hood junction box
G010B04Y
1
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4 5 6 7 8 9 10 11 12
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