2023 HYUNDAI TUCSON ECU

Emergency situations
8-22
When towing your vehicle in an
emergency without wheel dollies:
1. Release EPB before turning off the
engine.
2. Place the ignition switch to the OFF
position.
3. Change the gear to N (Neutral) while
pressing the brake pedal.
4. Place the ignition switch to the ACC
position.
CAUTION
Failure to shift the gear to N (Neutral)
may cause internal damage to the
transmission.
Removable towing hook
1. Open the tailgate, and remove the
towing hook from the tool case.
„„Front
ONX4080018
„„Rear
ONX4E080041
2. Remove the hole cover by pressing
the lower part of the cover on the
bumper.
3. Install the towing hook by turning it
clockwise into the hole until it is fully
secured.
4. Remove the towing hook and install
the cover after use.

08
8-23
Emergency towing
„„Front
ONX4080019
„„Rear
ONX4E080042If towing is necessary, we recommend
you have it done by an authorized
HYUNDAI dealer or a commercial tow
truck service.
If a towing service is not available in
an emergency, your vehicle may be
temporarily towed using a cable or chain
secured to the emergency towing hook
at the front (or rear) of the vehicle.
Use extreme caution when towing the
vehicle with a cable or chain. A driver
must be in the vehicle to steer it and
operate the brakes.
Towing in this manner may be done
only on hard-surfaced roads for a short
distance and at low speeds. Also, the
wheels, axles, power train, steering
and brakes must all be in good working
condition.
CAUTION
The driver must be in the vehicle for
steering and braking operations when
the vehicle is being towed. Passengers
other than the driver must not be in the
vehicle.
Always follow these emergency towing
precautions:
• Place the ignition switch in the ACC
position so the steering wheel is not
locked.
• Shift the gear to N (Neutral).
• Release the parking brake.
• Depress the brake pedal with more
force than normal as you will have
reduced braking performance.
• More steering effort will be required
because the power steering system
will be disabled.
• Use a vehicle heavier than your own to
tow your vehicle.
• The drivers of both vehicles should
communicate with each other
frequently.
• Before emergency towing, check that
the hook is not broken or damaged.
• Fasten the towing cable or chain
securely to the hook.
• Do not jerk the hook. Apply steady
and even force.

Maintenance
9-14
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.
Information
When you are inspecting the belt, turn the
engine off.
Fuel lines, fuel hoses and
connections
Check the fuel lines, fuel hoses and
connections for leakage and damage.
We recommend an authorized HYUNDAI
dealer replace any damaged or leaking
parts immediately.
Fuel filter
The fuel filter is considered to be
maintenance free but periodic inspection
is recommended for this maintenance
depends on fuel quality. If there are
some important matters like fuel flow
restriction, surging, loss of power, hard
starting problem etc., replace the fuel
filter immediately. We recommend that
you consult an authorized HYUNDAI
dealer for details.
Vapor hose and fuel filler cap
The vapor hose and fuel filler cap should
be inspected at those intervals specified
in the maintenance schedule. Your
HYUNDAI dealer will help to determine if
replacement is needed.
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 ensure 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.
EXPLANATION OF SCHEDULED MAINTENANCE ITEMS

09
9-21
WARNING
The electric motor for the cooling fan may continue to operate or start up
when the engine is not running and
can cause serious injury. Keep hands,
clothing and tools away from the
rotating fan blades of the cooling fan.
Always turn off the vehicle unless the
vehicle has to be inspected with the
engine on. Be cautious as the cooling
fan may operate if the negative (-)
battery terminal is not disconnected.
WARNING
Make sure the coolant cap is properly
closed after refilling coolant. Otherwise
the engine could be overheated while
driving.
„„Engine compartment front view
OOSH089010L
1. Check if the coolant cap label is
straight in front.
OJX1099046
2. Make sure that the tiny protrusions
inside the coolant cap is securely
interlocked.

09
9-33
For best battery service
ONX4E090050
• Keep the battery securely mounted.
• Keep the battery top clean and dry.
• Keep the terminals and connections
clean, tight, and coated with
petroleum jelly or terminal grease.
• Rinse any spilled electrolyte from the
battery immediately with a solution of
water and baking soda.
• If the vehicle is not going to be used
for an extended time, disconnect the
battery cables.
Information
To check the batteries, open the cover (B).
For 7-seater, the clips (A) must be
removed first to open the cover.
Battery capacity label
„„Type A
OTM090063L
„„Type B
OTM090064L
1. MF68L-DIN : The HYUNDAI model
name of battery
2. 12V : The nominal voltage
3. 68Ah (20HR) : The nominal capacity
(in Ampere hours)
4. RC 110min : The nominal capacity (in
Ampere hours)
5. 600A : The cold-test current in
amperes by SAE/EN

09
9-47
Engine compartment panel fuse
replacement
Blade fuse / Cartridge fuse
„„Blade type fuse
ONX4090018
„„Cartridge type fuse
ONX4090017
1. Turn the vehicle off.
2. Turn all other switches off.
3. Remove the fuse panel cover by
pressing the tap 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
„„Multi type
ONX4090016
If the multi fuse or midi fuse is blown,
we recommend that you consult an
authorized HYUNDAI dealer.

09
9-53
Engine compartment fuse panel
Fuse NameFuse Rating Circuit Protected
IG1 30A
PDM (IG1) Relay
IG2 30A
PDM (IG2) Relay, E/R Junction Block (RLY.3)
ECU3 10A
PCM
EPB3 10A
ESC Module
FCA 10A
Front Radar
EOP2 10A
Electronic Oil Pump
SENSOR1 20A
Ignition Coil #1~#4
SENSOR2 15A
Oxygen Sensor (UP/DOWN)
ECU1 20A
PCM
SENSOR4 10A
E/R Junction Block (Fuel Pump Relay)
SENSOR3 10AOil Control Valve, Valiable Oil Pump Solenoid, Purge
Control Solenoid Valve, Variable Intake Solenoid Valve,
Cooling Fan Controller, Canister Close Valve, A/C Comp
Relay
A/C 10A
A/C Comp Relay
SENSOR5 15A
Injector #1~#4
HORN 10A
Horn Relay
WIPER FRT2 15A
Front Wiper (Low) Relay, PCM, IBU
WIPER RR 15AICU Junction Block (Rear Wiper Relay), Rear Wiper
Motor
WIPER FRT1 10A
Front Wiper (Low) Relay, Front Wiper Motor
POWER OUTLET1 15A
Luggage Power Outlet
POWER
OUTLET2 10A
Front Power Outlet
ACC 15A
ICU Junction Block (Fuse - MODULE1, MODULE2)
TCU1 10A
PCM
ECU2 15A
PCM

IndexI-8
Integrated memory system ................................................................................... 5-37
Recalling memory positions ............................................................................. 5-38
Resetting the system ......................................................................................... 5-38
Seat Easy Access Operation ............................................................................. 5-39
Storing memory positions ................................................................................ 5-37
Intelligent Speed Limit Assist (ISLA) ................................................................. 7-60
Intelligent Speed Limit Assist Malfunction and Limitations ........................... 7-63
Intelligent Speed Limit Assist Operation ......................................................... 7-61
Intelligent Speed Limit Assist Settings ............................................................ 7-60
Interior features .................................................................................................. 5-130
Cargo security screen ..................................................................................... 5-138
Clock .............................................................................................................. 5-136
Coat hook ....................................................................................................... 5-136
Cup holder ...................................................................................................... 5-130
Floor mat anchor(s) ........................................................................................ 5-137
Luggage net holder ......................................................................................... 5-137
Power outlet .................................................................................................... 5-131
Sunvisor .......................................................................................................... 5-131
USB charger ................................................................................................... 5-132
Wireless smart phone charging system .......................................................... 5-133
Interior lights ....................................................................................................... 5-91
Front lamps ....................................................................................................... 5-91
Glove box lamp ................................................................................................ 5-92
Interior Lamp AUTO OFF ............................................................................... 5-91
Luggage compartment lamp ............................................................................. 5-93
Rear lamps ....................................................................................................... 5-92
Vanity mirror lamp .......................................................................................... 5-92
Welcome system .............................................................................................. 5-93
Interior overview .................................................................................................. 2-4
J
Jump starting .......................................................................................................... 8-4
010_NX4a_HMA_INDEX.indd I-8 2021-03-02  5:44:48