check engine Hyundai Sonata 2020 Service Manual

07
7-3
If you Have a Flat Tire While
Driving
If a tire goes flat while you are driving:
• Take your foot off the accelerator pedal and let the vehicle slow down
while driving straight ahead. Do not
apply the brakes immediately or
attempt to pull off the road as this
may cause loss of vehicle control
resulting in an accident. When the
vehicle has slowed to such a speed
that it is safe to do so, brake carefully
and pull off the road. Drive off the
road as far as possible and park on
firm, level ground. If you are on a
divided highway, do not park in the
median area between the two traffic
lanes.
• When the vehicle is stopped, press the hazard warning flasher button, move
the shift button into P (Park), and
apply the parking brake, and place
the ignition switch in the LOCK/OFF
position.
• Have all passengers get out of the vehicle. Be sure they all get out on the
side of the vehicle that is away from
traffic.
• When changing a flat tire, follow the instructions provided later in this
chapter.
IF THE ENGINE WILL NOT
START
If the Engine Doesn’t Turn Over
or Turns Over Slowly
• Be sure the shift button is in N (Neutral) or P (Park). The engine starts
only when the shift button is in N
(Neutral) or P (Park).
• Check the battery connections to be sure they are clean and tight.
• Turn on the interior light. If the light dims or goes out when you operate
the starter, the battery is drained.
Do not push or pull the vehicle to start it.
This could cause damage to your vehicle.
See instructions for “Jump Starting”
provided in this chapter.
CAUTION
Push or pull starting the vehicle may
cause the catalytic converter to
overload which can lead to damage to
the emission control system.
If the Engine Turns Over
Normally but Doesn’t Start
Check the fuel level and add fuel if
necessary.
If the engine still does not start, have
your vehicle checked by an authorized
HYUNDAI dealer.

07
7-5
Jump starting procedure
1. Position the vehicles close enough that the jumper cables will reach, but
do not allow the vehicles to touch.
2. Avoid fans or any moving parts in the engine compartment at all times, even
when the vehicles are turned off.
3. Turn off all electrical devices such as radios, lights, air conditioning, etc.
Put the vehicles in P (Park) and set
the parking brakes. Turn both vehicles
OFF.
ODN8A079022ODN8A079022
4. Connect the jumper cables in the exact sequence shown in the
illustration. First connect one jumper
cable to the red, positive (+) jumper
terminal of your vehicle (1).
5. Connect the other end of the jumper cable to the red, positive (+) battery/
jumper terminal of the assisting
vehicle (2).
6. Connect the second jumper cable to the black, negative (-) battery/chassis
ground of the assisting vehicle (3).
7. Connect the other end of the second jumper cable to the black, negative (-)
chassis ground of your vehicle (4).
Do not allow the jumper cables to
contact anything except the correct
battery or jumper terminals or the
correct ground. Do not lean over the
battery when making connections. 8. Start the engine of the assisting
vehicle and let it run at approximately
2,000 rpm for a few minutes. Then
start your vehicle.
If your vehicle will not start after a few
attempts, it probably requires servicing.
In this event please seek qualified
assistance. If the cause of your battery
discharging is not apparent, have your
vehicle checked by an authorized
HYUNDAI dealer.
Disconnect the jumper cables in the
exact reverse order you connected them:
1. Disconnect the jumper cable from the black, negative (-) chassis ground of
your vehicle (4).
2. Disconnect the other end of the jumper cable from the black, negative
(-) battery/chassis ground of the
assisting vehicle (3).
3. Disconnect the second jumper cable from the red, positive (+) battery/
jumper terminal of the assisting
vehicle (2).
4. Disconnect the other end of the jumper cable from the red, positive (+)
jumper terminal of your vehicle (1).

Emergency Situations7-6
If your temperature gauge indicates
overheating, you experience a loss of
power, or hear loud pinging or knocking,
the engine may be overheating. If this
happens, you should:
1. Pull off the road and stop as soon as it is safe to do so.
2. Place the shift button in P (Park) and set the parking brake. If the air
conditioning is ON, turn it OFF.
3. If engine coolant is running out under the vehicle or steam is coming out
from the hood, stop the engine. Do
not open the hood until the coolant
has stopped running or the steaming
has stopped. If there is no visible
loss of engine coolant and no steam,
leave the engine running and check
to be sure the engine cooling fan is
operating. If the fan is not running,
turn the engine off.
WARNING
While the engine is running,
keep hands, clothing and tools
away from the moving parts
such as the cooling fan and
drive belt to prevent serious
injury.
4. Check for coolant leaking from the radiator, hoses or under the vehicle. (If
the air conditioning had been in use, it
is normal for cold water to be draining
from it when you stop.)
5. If engine coolant is leaking out, stop the engine immediately and call the
nearest authorized HYUNDAI dealer
for assistance.
WARNING
Your vehicle is equipped
with a pressurized coolant
reserve tank. NEVER remove
the engine coolant reservoir
tank/radiator cap or the drain
plug while the engine and
radiator are HOT. Hot coolant
and steam may blow out under
pressure, causing serious
injury.
Turn the engine off and wait until the
engine cools down. Use extreme care
when removing the engine coolant
reservoir tank/radiator cap. Wrap
a towel or thick rag around it, and
turn it counterclockwise slowly to
release some of the pressure from the
system. Step back while the pressure is
released.
When you are sure all the pressure has
been released, continue turning the cap
counterclockwise to remove it.
6. If you cannot find the cause of the overheating, wait until the engine
temperature has returned to normal.
Then, if coolant has been lost,
carefully add coolant to the reservoir
to bring the fluid level in the reservoir
up to the halfway mark.
7. Proceed with caution, keeping alert for further signs of overheating. If
overheating happens again, call
an authorized HYUNDAI dealer for
assistance.
CAUTION
Serious loss of coolant indicates a
leak in the cooling system and should
be checked as soon as possible by an
authorized HYUNDAI dealer.
IF THE ENGINE OVERHEATS

07
7-7
ODN8079002ODN8079002
ODN8049030LODN8049030L
(1) Low Tire Pressure / TPMS Malfunction Indicator Lamp
(2) Low Tire Pressure / Tire Pressure Monitor / TPMS Malfunction Display
(shown on the cluster LCD display)
Check Tire Pressure
ODN8049022LODN8049022L
• You can check the tire pressure in the Assist mode on the cluster.
Refer to the “LCD Display Mode”
section in chapter 4.
• A “Drive to display” message will appear for the first few minutes of
driving after initial engine start up.
If the tire pressure is not displayed
after a few minutes of driving, check
the tire pressures.
• The displayed tire pressure values may differ from those measured with a tire
pressure gauge.
• You can change the tire pressure unit in the User Settings mode on the
cluster.
- psi, kpa, bar (Refer to the “User Settings Mode” section in chapter
4).
TIRE PRESSURE MONITORING SYSTEM (TPMS) (IF EQUIPPED)

Emergency Situations7-8
Tire Pressure Monitoring System
WARNING
Over-inflation or under-inflation can
reduce tire life, adversely affect vehicle
handling, and lead to sudden tire failure
that may cause loss of vehicle control
resulting in an accident.
Each tire, including the spare (if
provided), should be checked monthly
when cold and inflated to the inflation
pressure recommended by the vehicle
manufacturer on the vehicle placard
or tire inflation pressure label. If your
vehicle has tires of a different size than
the size indicated on the vehicle placard
or tire inflation pressure label, you should
determine the proper tire inflation
pressure for those tires.
As an added safety feature, your
vehicle has been equipped with a tire
pressure monitoring system (TPMS)
that illuminates a low tire pressure
telltale when one or more of your tires is
significantly under-inflated. Accordingly,
when the low tire pressure telltale
illuminates, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Driving on
a significantly under-inflated tire causes
the tire to overheat and can lead to tire
failure.
Under-inflation also reduces fuel
efficiency and tire tread life, and may
affect the vehicle’s handling and
stopping ability.
Please note that the TPMS is not a
substitute for proper tire maintenance,
and it is the driver’s responsibility to
maintain correct tire pressure, even if
under-inflation has not reached the level
to trigger illumination of the TPMS low
tire pressure telltale.
Your vehicle has also been equipped with
a TPMS malfunction indicator to indicate
when the system is not operating
properly. The TPMS malfunction
indicator is combined with the low
tire pressure telltale. When the system
detects a malfunction, the telltale will
flash for approximately one minute and
then remain continuously illuminated.
This sequence will continue upon
subsequent vehicle start-ups as long as
the malfunction exists.
When the malfunction indicator is
illuminated, the system may not be able
to detect or signal low tire pressure as
intended. TPMS malfunctions may occur
for a variety of reasons, including the
installation of replacement or alternate
tires or wheels on the vehicle that
prevent the TPMS from functioning
properly.
Always check the TPMS malfunction
telltale after replacing one or more tires
or wheels on your vehicle to ensure that
the replacement or alternate tires and
wheels allow the TPMS to continue to
function properly.
NOTICE
If any of the below happens, have
the system checked by an authorized
HYUNDAI dealer.
1. The Low Tire Pressure TPMS Malfunction Indicator does not
illuminate for 3 seconds when the
ignition switch is placed to the ON
position or engine is running.
2. The TPMS Malfunction Indicator remains illuminated after blinking for
approximately 1 minute.
3. The Low Tire Pressure LCD display remains illuminated

Engine Compartment ........................................................................\
............ 8-3
Maintenance Services ........................................................................\
...........8-4
Owner’s Responsibility ........................................................................\
.................... 8-4
Owner Maintenance Precautions ........................................................................\
.... 8-4
Owner Maintenance ........................................................................\
.............. 8-5Owner Maintenance Schedule ........................................................................\
........ 8-5
Scheduled Maintenance Services ................................................................ 8-7Normal Maintenance Schedule (Smartstream G1.6 T-GDi) ...................................8-8
Maintenance Under Severe Usage Conditions (Smartstream G1.6 T-GDi) ......... 8-11
Severe Driving Conditions ........................................................................\
.............. 8-11
Normal Maintenance Schedule (Smartstream G2.5 GDi) ..................................... 8-12
Maintenance Under Severe Usage Conditions (Smartstream G2.5 GDi) ................8-15
Severe Driving Conditions ........................................................................\
..............8-15
Explanation of Scheduled Maintenance Items .......................................... 8-16
Engine Oil ........................................................................\
............................. 8-19
Checking the Engine Oil Level ........................................................................\
........8-19
Checking the Engine Oil and Filter ....................................................................... 8-20
Engine Coolant ........................................................................\
......................8-21Checking the Engine Coolant Level ....................................................................... 8-21
Engine Coolant ........................................................................\
................................ 8-21
Changing Engine Coolant ........................................................................\
.............. 8-23
Brake fluid ........................................................................\
............................ 8-24Checking the Brake Fluid Level ........................................................................\
..... 8-24
Washer Fluid ........................................................................\
......................... 8-25Checking the Washer Fluid Level ........................................................................\
.. 8-25
Air Cleaner ........................................................................\
............................ 8-26Filter Replacement ........................................................................\
......................... 8-26
Climate Control Air Filter ........................................................................\
..... 8-28
Filter Inspection........................................................................\
.............................. 8-28
Filter Replacement ........................................................................\
......................... 8-28
Wiper Blades ........................................................................\
........................ 8-29Blade Inspection ........................................................................\
............................ 8-29
Blade Replacement ........................................................................\
........................ 8-29
Battery ....................................................................\
.......................................8-31For Best Battery Service ........................................................................\
................ 8-32
Battery Recharging ........................................................................\
........................ 8-32
Reset Features ........................................................................\
................................ 8-33
8. Maintenance
8

Tires and Wheels ........................................................................\
.................. 8-34Tire Care ........................................................................\
.......................................... 8-34
Recommended Cold Tire Inflation Pressures ....................................................... 8-34
Check Tire Inflation Pressure ........................................................................\
......... 8-35
Tire Rotation ........................................................................\
................................... 8-36
Wheel Alignment and Tire Balance ....................................................................... 8-36
Tire Replacement ........................................................................\
........................... 8-37
Wheel Replacement ........................................................................\
....................... 8-38
Tire Traction ........................................................................\
.................................... 8-38
Tire Maintenance..................................................................\
.................................. 8-38
Tire Sidewall Labeling ........................................................................\
.................... 8-38
Tire Terminology and Definitions ........................................................................\
.. 8-42
All Season Tires ........................................................................\
...............................8-44
Summer Tires ........................................................................\
.................................8-44
Snow Tires......................................................................\
.........................................8-44
Radial-Ply Tires ........................................................................\
............................... 8-45
Low Aspect Ratio Tires ........................................................................\
................... 8-45
Fuses ...................................................................\
......................................... 8-46Instrument Panel Fuse Replacement .................................................................... 8-47
Engine Compartment Panel Fuse Replacement ..................................................8-48
Fuse/Relay Panel Description........................................................................\
........8-49
Light Bulbs ........................................................................\
............................ 8-55
Headlamp, Parking Lamp, Daytime Running Light, Turn Signal Lamp,
Cornering Lamp and Side Marker ........................................................................\
. 8-55
Side Repeater Lamp Replacement .......................................................................8-56
Rear Combination Light Bulb Replacement .........................................................8-56
High Mounted Stop Lamp Replacement ..............................................................8-58
License Plate Light Bulb Replacement .................................................................8-58
Interior Light Bulb Replacement ........................................................................\
...8-59
Appearance Care ........................................................................\
................. 8-61Exterior Care ........................................................................\
................................... 8-61
Interior Care ........................................................................\
....................................8-65
Emission Control System ........................................................................\
..... 8-67
California Perchlorate Notice ...................................................................... 8-70
Consumer Information ........................................................................\
......... 8-71
Reporting Safety Defects ........................................................................\
.... 8-72
8

08
8-5
WARNING
Performing maintenance work on a
vehicle can be dangerous. If you lack
sufficient knowledge and experience or
the proper tools and equipment to do
the work, have it done by an authorized
HYUNDAI dealer.
ALWAYS follow these precautions for
performing maintenance work:
• Park your vehicle on level ground,
move the shift button into the P
(Park) position, place the ignition
switch in the LOCK/OFF position.
• Block the tires (front and back) to
prevent the vehicle from moving.
Remove loose clothing or jewelry
that can become entangled in
moving parts.
• If you must run the engine during
maintenance, do so out doors or in
an area with plenty of ventilation.
• Keep flames, sparks, or smoking
materials away from the battery and
fuel-related parts. The following lists are vehicle checks and
inspections that should be performed
by the owner or an authorized HYUNDAI
dealer at the frequencies indicated to
help ensure safe, dependable operation
of your vehicle.
Any adverse conditions should be
brought to the attention of your dealer as
soon as possible.
These Owner Maintenance vehicle
checks are generally not covered by
warranties and you may be charged for
labor, parts and lubricants used.
Owner Maintenance Schedule
When you stop for fuel:
• Check the engine oil level.
• Check the coolant level in the engine
coolant reservoir.
• Check the windshield washer fluid level.
• Check the for low or under-inflated tires.
WARNING
Be careful when checking your engine
coolant level when the engine is hot.
This may result in coolant being blown
out of the opening and cause serious
burns and other injuries.
OWNER MAINTENANCE

Maintenance8-6
While operating your vehicle:
• Note any changes in the sound of the exhaust or any smell of exhaust fumes
in the vehicle.
• Check for vibrations in the steering wheel. Notice if there is any increased
steering effort or looseness in the
steering wheel, or change in its
straight-ahead position.
• Notice if your vehicle constantly turns slightly or “pulls” to one side when
traveling on smooth, level road.
• When stopping, listen and check for unusual sounds, pulling to one side,
increased brake pedal travel or “hard-
to-push” brake pedal.
• If any slipping or changes in the operation of your transmission occurs,
check the transmission fluid level.
• Check the automatic transmission P (Park) function.
• Check the parking brake.
• Check for fluid leaks under your vehicle (water dripping from the air
conditioning system during or after
use is normal).
At least monthly:
• Check coolant level in the engine coolant reservoir.
• Check the operation of all exterior lights, including the brake lights, turn
signals and hazard warning flashers.
• Check the inflation pressures of all tires including the spare for tires that
are worn, show uneven wear, or are
damaged.
• Check for loose wheel lug nuts.
At least twice a year:
(i.e., every Spring and Autumn)
• Check radiator, heater and air conditioning hoses for leaks or
damage.
• Check windshield washer spray and wiper operation. Clean wiper blades
with a clean cloth dampened with
washer a fluid.
• Check headlamp alignment.
• Check muffler, exhaust pipes, shields and clamps.
• Check the seat belts for wear and function.
At least once a year:
• Clean body and door drain holes.
• Lubricate door hinges and hood hinges.
• Lubricate door and hood locks and latches.
• Lubricate door rubber weather strips.
• Lubricate door checker.
• Check the air conditioning system.
• Inspect and lubricate automatic transmission linkage and controls.
• Clean the battery and terminals.
• Check the brake fluid level.

Maintenance8-16
Engine Oil and Filter
The engine oil and filter should be
changed at the intervals specified in the
maintenance schedule. If the vehicle
is being driven in severe conditions,
more frequent oil and filter changes are
required.
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.
Fuel Filter
A clogged-up fuel filter may limit the
vehicle driving speed, damage the
emission system, and cause the hard
starting. When a considerable amount
of foreign substances are accumulated
in the fuel tank, the fuel filter should be
replaced.
Upon installing a new fuel filter, operate
the engine for several minutes, and
check the connections for any leakages.
Fuel filters should be installed by an
authorized HYUNDAI dealer.
Fuel Lines, Fuel Hoses and
Connections
Check the fuel lines, fuel hoses and
connections for leakage and damage.
Have an authorized HYUNDAI dealer
replace any damaged or leaking parts
immediately.
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
a new vapor hose or fuel filler cap is
correctly replaced.
Air Cleaner Filter
A genuine HYUNDAI air cleaner filter
is recommended when the filter is
replaced.
Spark Plugs
Make sure to install new spark plugs of
the correct heat range.
Cooling System
Check cooling system components, such
as radiator, coolant reservoir, hoses and
connections for leakage and damage.
Replace any damaged parts.
EXPLANATION OF SCHEDULED MAINTENANCE ITEMS