check engine HYUNDAI I20 2021 Repair Manual

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10
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„„ Blade type Blade type
NormalNormalBlownBlown
„„ Cartridge type Cartridge type
„„ Multi fuse Multi fuse
NormalNormalBlownBlown
NormalNormalBlownBlown
A vehicle’s electrical system is protected
from electrical overload damage by
fuses.
This vehicle has 2 fuse panels, one
located in the driver’s side panel bolster,
the other in the engine compartment.
If any of your vehicle’s lights,
accessories, or controls do not work,
check the appropriate circuit fuse. If a
fuse has blown, the element inside the
fuse will be melted or broken.
If the electrical system does not work,
first check the driver’s side fuse panel.
Before replacing a blown fuse, turn the
engine and all switches off, and then
disconnect the negative battery cable.
Always replace a blown fuse with one of
the same rating.
If the replacement fuse blows, this
indicates an electrical problem.
Avoid using the system involved and
we recommend that all inspect an
authorized HYUNDAI dealer.
i Information
Three kinds of fuses are used: blade type
for lower amperage rating, cartridge
type, and multi fuse for higher amperage
ratings.
WARNING
NEVER replace a fuse with anything but
another fuse of the same rating.
• A higher capacity fuse could cause
damage and possibly cause a fire.
• Do not install a wire or aluminum
foil instead of the proper fuse -
even as a temporary repair. It may
cause extensive wiring damage and
possibly a fire.
NOTICE
Do not use a screwdriver or any other
metal object to remove fuses because
it may cause a short circuit and damage
the system.
FUSES

10-64
Maintenance
Instrument panel fuse
replacement
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1. Turn the vehicle off.
2. Turn all other switches OFF.
3. Open the fuse panel cover.
4. Refer to the label on the inside of
the fuse panel cover to locate the
suspected fuse location.
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5. Pull the suspected fuse straight out.
Use the removal tool provided in the
engine compartment fuses panel.
6. Check the removed fuse; replace it if
it is blown. Spare fuses are provided in
the instrument panel fuse panels (or in
the engine compartment fuse panel).
7. Push in a new fuse of the same rating,
and make sure it fits tightly in the
clips.If it fits loosely, we recommend
that you consult an authorized
HYUNDAI dealer.
In an emergency, if you do not have
a spare fuse, use a fuse of the same
rating from a circuit you may not need
for operating the vehicle, such as the
cigarette lighter fuse.
If the headlights or other electrical
components do not work and the fuses
are undamaged, check the fuse panel
in the engine compartment. If a fuse
is blown, it must be replaced with the
same rating.

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10
Engine compartment panel fuse
replacement
OBI3090018OBI3090018
1. Turn the vehicle off.
2. Turn all other switches OFF.
3. Remove the fuse panel cover by
pressing the tab and pulling up.
4. Check the removed fuse; replace it
if it is blown. To remove or insert the
fuse, use the fuse puller in the engine
compartment fuse panel.
5. Push in a new fuse of the same rating,
and make sure it fits tightly in the
clips. If it fits loosely, we recommend
that you consult an authorized
HYUNDAI dealer.
NOTICE
After checking the fuse panel in the
engine compartment, securely
install the fuse panel cover. You may
hear a clicking sound if the cover is
securely latched. If it is not securely
latched, electrical failure may occur
from water contact.
Multi fuse (Main fuse)
OBI3090017OBI3090017
If the multi fuse is blown, it must be
removed as follows:
1. Turn the vehicle off.
2. Disconnect the negative battery cable.
3. Remove the fuse panel cover by
pressing the tab and pulling it up.
4. Remove the nuts shown in the picture
above.
5. Replace the fuse with a new one of
the same rating.
6. Reinstall in the reverse order of
removal.
If the multi fuse is blown, we
recommend that you consult an
authorized HYUNDAI dealer.

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10
3. Exhaust emission control
system
The Exhaust Emission Control System is
a highly effective system which controls
exhaust emissions while maintaining
good vehicle performance.
Vehicle modifications
• This vehicle should not be modified.
Modification of your vehicle could
affect its performance, safety or
durability and may even violate
governmental safety and emissions
regulations.
In addition, damage or performance
problems resulting from any
modification may not be covered
under warranty.
• If you use unauthorized electronic
devices, it may cause the vehicle to
operate abnormally, wire damage,
battery discharge and fire. For your
safety, do not use unauthorized
electronic devices.
Engine exhaust gas precautions
(carbon monoxide)
• Carbon monoxide can be present with
other exhaust fumes. Therefore, if
you smell exhaust fumes of any kind
inside your vehicle, have it inspected
and repaired immediately. If you ever
suspect exhaust fumes are coming
into your vehicle, drive it only with
all the windows fully open. Have
your vehicle checked and repaired
immediately.
WARNING
Exhaust
Engine exhaust gases contain carbon
monoxide (CO). Though colorless
and odorless, it is dangerous and
could be lethal if inhaled. Follow the
instructions on this page to avoid CO
poisoning.
• Do not operate the engine in confined
or closed areas (such as garages) any
more than what is necessary to move
the vehicle in or out of the area.
• When the vehicle is stopped in an
open area for more than a short time
with the engine running, adjust the
ventilation system (as needed) to draw
outside air into the vehicle.
• Never sit in a parked or stopped
vehicle for any extended time with the
engine running.
• When the engine stalls or fails to
start, excessive attempts to restart
the engine may cause damage to the
emission control system.

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10
Diesel particulate filter (DPF)
(if equipped)
The Diesel Particulate Filter (DPF)
system removes the soot in the exhaust
gas. Unlike a disposable air filter,
the DPF system automatically burns
(oxidizes) and removes the accumulated
soot according to the driving condition.
In order words, the active burning by
engine control system and high exhaust
gas temperature caused by normal/high
diving condition burns and removes the
accumulated soot.
However, if the vehicle continues to
be driven at repeated short distance
or driven at low speed for a long time,
the accumulated soot may not be
automatically removed because of low
exhaust gas temperature. More than
a certain amount of soot deposited,
the malfunction indicator light (
)
illuminates.
When the malfunction indicator light
illuminates, it may turn-off after driving
the vehicle at more than 60km/h (37
mph) or at more than second gear with
1500~2500 engine rpm for a certain time
(for about 25 minutes).
If the malfunction indicator light (
) is not turn-off or blinking continuesly
in spite of the procedure, visit a
professional workshop and check the
DPF system. HYUNDAI recommends
to visit an authorized HYUNDAI dealer/
service partner.
If you continue to drive with the
malfunction indicator light blinking for
a long time, the DPF system can be
damaged and fuel consumption can be
worsen and the engine durability can be
worsen by oil dilution.
CAUTION
Diesel Fuel (if equipped with DPF)
We recommend you to use only the
regulated diesel fuels, when your
vehicle is equipped with the DPF
system.
When you use other diesel fuels, which
is high in sulfurs (above 50 ppm) or
contains unspecified additives, it may
damage the DPF system and cause the
white smoke emission.
Lean NOx Trap (if equipped)
The Lean NOx Trap (LNT) system
removes the nitrogen oxide in the
exhaust gas. The smell can occur in the
exhaust gas depending on the quality
of the fuel and it can degrade NOx
reduction performance, please use the
regulated automotive diesel fuel.

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Maintenance
4. Self Regeneration Mode
LCD Type
If the warning message “Self
Regeneration” is stored in inspection
message tap, it is operable in LCD
warning message page.
WARNING
• Make sure the vehicle parked on
safety zone (to avoid the flammables
like grass and traffic accident)
• Check remained fuel above 1/5 of
full level fuel gauge to prevent fuel
overheat
• Open the hood to prevent engine
room overheat
• Self regeneration should be done
only when DPF indicator illuminates
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If the warning message “Diesel filter
regeneration required, See owner’s
manual.” appears on the LCD display,
Self Regeneration is required
To initiate Self Regeneration
1. Engage parking brake and shift lever
at P state.
2. Turn on the engine
3. Warm up the engine and check engine
temperature gauge at the middle
position
4. Turn on the air conditioner and set the
blower to the maximum.
5. Turn on the high beam.
6. Operate the rear defog function.
7. Hold the OK button on the LCD
warning message page.
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8. Turn off and turn on the engine again.

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Not Operating Condition
Under below condition, Diesel
Catalyst regeneration process may be
interrupted. (Engine RPM drops to idle
state)
- Engine overheat or insufficient
warm-up
- Shift lever change to D or R state
- Acceleration pedal is pressed
- Movement of Vehicle (Vehicle speed
over 0)
Service Check
If the DPF indicator change from
illuminates to blink or Engine Check
Lamp(MIL) illuminates with DPF
indicator in spite of the procedure,
please visit an authorized Hyundai dealer
and then check the Diesel Catalyst
and engine system including oil level
inspection.
Please note that the vehicle acceleration
is limited to protect engine system when
DPF indicator blinks or Engine Check
Lamp(MIL) illuminates.
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Operationg Self Regeneration Mode
If the self regeneration mode starts, the
message “Filter regenerationg…” and the
remaining time appears.
It takes around 30~60 minutes.
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Self Regeneration Mode Fail
The regeneration operation could be
canceled if the driver press the OK
button firmly while operating the self
regeneration process.

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Maintenance
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If the system still needs the self
regeneration process after cancelling
the operation, the warning message
appears. (Diesel filter regeneration
required.)
If the driver press the OK button firmly,
it can restart the self regeneration mode
again. (The Self regeneration conditions
should be satisfied.)
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The self regeneration process stops if
any of the self regeneration conditions
is cancelled. If the self regeneration
process is cancelled automatically, the
system maintains “Self-regeneration
stopped” message.
If the driver press the OK button firmly,
it can restart the self regeneration mode
again. (Self regeneration conditions
should be satisfied.)
Segment Type
Regeneration
The self regeneration procedure is
conducted as follows.
1) Repeat key position at LOCK (or
ACC)  ON state 5 times (within 30
seconds)
2) Start engine
3) Monitor engine state
: Within 20 seconds, engine RPM rise
to about 2000 & DPF indicator blinks
and it continues for 30~60 minutes.
After the end of regeneration, engine
RPM drop to idle & DPF indicator
turn out automatically.
4) Stop the engine (Key Off), wait for 20
seconds and restart the engine
5) Check malfunction indicator turn out
CAUTION
Under below condition, Diesel
Catalyst regeneration process may be
interrupted. (Engine RPM drops to idle
state)
• Engine overheat or insufficient
warm-up
• Shift lever change to D or R state
• Acceleration pedal is pressed
• Movement of Vehicle (Vehicle speed
over 0)

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WARNING
If vehicle doesn’t enter regeneration
mode or if regeneration mode is
interrupted, stop the engine (Key Off),
wait for 20 seconds and retry the self
regeneration procedure.
WARNING
Self regeneration should be done
only when DPF indicator illuminates.
Frequent regeneration may cause
engine oil dilution and shortening of
Diesel Catalyst durability.
Service Check
If the DPF indicator change from
illuminates to blink or Engine Check
Lamp(MIL) illuminates with DPF
indicator in spite of the procedure,
please visit an authorized Hyundai dealer
and then check the Diesel Catalyst
and engine system including oil level
inspection.
Please note that the vehicle acceleration
is limited to protect engine system when
DPF indicator blinks or Engine Check
Lamp(MIL) illuminates.