2023 HYUNDAI TUCSON HYBRID ECU

08
8-27
Emergency Towing
„Front
ONX4080019
„Rear
ONX4H080002
If towing is necessary, 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 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.

[ Place the shift button in 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.

9-3
09
„„Smartstream G1.6 T-GDi HEVSmartstream G1.6 T-GDi HEV
The actual engine compartment in the vehicle may differ from the illustration.
ONX4PH091001NONX4PH091001N
1. ECU
2. Engine coolant reservoir
3. Engine coolant reservoir cap
4. Inverter coolant reservoir
5. Brake fluid reservoir
6. Air cleaner7. Engine oil filler cap
8. Engine oil dipstick
9. Windshield washer fluid reservoir
10. Fuse box
11. Inverter coolant reservoir cap
ENGINE COMPARTMENT

09
9-19
Turn the vehicle off and wait until the
engine cools down. Use extreme care
when removing the engine coolant cap
and/or inverter coolant cap. Wrap a
thick towel around it, and turn it slowly
to the first stop. Step back while the
pressure is released from the cooling
system. When you are sure all the
pressure has been released, press down
on the cap, using a thick towel, and
continue turning to remove it.
Information
The engine coolant and/or inverter coolant
level is influenced by the hybrid system
temperature. Before checking or refilling
the engine coolant and/or inverter coolant,
turn the hybrid vehicle off.
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 until you disconnect
the (-) battery terminal (For plug-in
hybrid vehicle) or the battery connector
(For hybrid vehicle).
WARNING
Make sure the coolant cap is properly
closed after refilling coolant. Otherwise
the engine could be overheated while
driving.
„„Engine compartment front viewEngine compartment front view
OTMH090008OTMH090008
1. Check if the coolant cap label is straight In front.
„„Engine compartment rear viewEngine compartment rear view
ONX4H090008ONX4H090008
2. Make sure that the tiny protrusions inside the coolant cap is securely
interlocked.

Maintenance9-30
For Best Battery Service
„„Luggage compartmentLuggage compartment
ONX4PH091031NONX4PH091031N
• 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 - For batteries
marked with UPPER and
LOWER
OHI078084LOHI078084L
If your vehicle is equipped with a battery
marked with LOWER (MIN) and UPPER
(MAX) on the side, you should check the
electrolyte level.
The electrolyte level should be between
LOWER (MIN) and UPPER (MAX).
When the electrolyte level is low, add
distilled (or de-mineralized) water. (Never
add sulfuric acids or other electrolyte).
Be careful not to spill distilled (or
demineralized) water over the battery
surface or other adjacent components.
Also, do not overfill the battery cells.
If not, it may corrode the battery or other
components. Finally, securely close the
cell cap. However, contact an authorized
HYUNDAI dealer for better battery
service.

09
9-49
Engine Compartment Panel Fuse
Replacement
„„Blade type fuseBlade type fuse
ONX4H090016ONX4H090016
„„Cartridge type fuseCartridge type fuse
ONX4H090017ONX4H090017
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, 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
ONX4H090015ONX4H090015
If the multi fuse is blown, consult an
authorized HYUNDAI dealer.

Maintenance9-52
Fuse Name Fuse rating Circuit Protected
Module7 7.5A IBU
PT
G 10A Liftgate Relay
Multi Media 20A Audio, A/V & Navigation Head Unit Washer 15A Multifunction Switch
Module8 7.5A Front/Rear Seat Warmer Control Module, Front Air
Ventilation Seat Control Module
A/BAG1 15A SRS Control Module
A/C 7.5A Electronic A/C Compressor, Front/Rear A/C Control Switch
A/C Control Module, E/R Junction Block (RLY.10, RLY.13)
Module2 15A Front USB Charge Connector, Rear USB Charge Connector
Module1 10A E-Call Unit, Audio, A/V & Navigation Head Unit, AMP, Audio
Keyboard, A/V & Navigation Keyboard, IBU, BMS, ADAS
Parking ECU Unit, Power Outside Mirror Switch
Module6 10A Front Console Switch, EPB Switch
IBU1 7.5A IBU
Module5 10A Front/Rear Seat Warmer Control Module, E-Call Unit, AMP,
Driver IMS Control Module, Front/Rear A/C Control Switch,
Audio, A/V & Navigation Head Unit, Wireless Charger
Unit, Front Air Ventilation Seat Control Module, Data Link
Connector, A/C Control Module, Heat Lamp LH/RH, Electro
Chromic Mirror
A/BAG IND. 7.5A Instrument Cluster, Overhead Console Lamp
IG3 4 10A HPCUIG3 2 10A Electronic Water Pump (HEV)
Module4 7.5A Front View Camera, IBU, AWD ECM, VESS Unit, Crash Pad
Switch, ECS Unit, ADAS Parking ECU
E-Shifter 7.5A Electronic Shift Switch, SCU

Maintenance9-56
Engine compartment fuse panel
Fuse Name Fuse rating Circuit Protected
MDPS *
180A/100A MDPS Unit (Column Type-80A) / MDPS Unit (Rack Type-
100A)
C/FAN 80A Cooling Fan Motor
B+1 60A ICU Junction Block (IPS01, IPS02, IPS03, IPS04, IPS05)
B+3 60A ICU Junction Block (Power Window Main Relay, Fuse : F2,
F3, F5, F6, F8, F9, F11, F12, F18, F15)
CVVD 50A CVVD Actuator
Bower 40A E/R Junction Block (RLY.10) IEB3 40A IEB Unit
Rear Defogger 40A E/R Junction Block (RLY.14) Trailer1 50A Trailer Connector Unit
B+4 50A ICU Junction Block (Long Term Load Latch Relay, Fuse : F1,
F4, F14, F17, F20, F21, F24, F27)
IEB2 60A IEB Unit
IEB1 60A IEB UnitB+2 50A ICU Junction Block (IPS06, IPS07, IPS08, IPS10, IPS11)
PTC Heater 50A E/R Junction Block (RLY.13) PTG 40A Power Liftgate Unit
E-Shifter1 30A SCU
Fuel Pump 20A E/R Junction Block (RLY.7) AWD 20A AWD ECM
ECU4 10A ECM
*1 : MDPS (Motor Driven Power Steering) is the same as EPS (Electric Power Steering)

09
9-57
Fuse Name Fuse ratingCircuit Protected
IG3 20A E/R Junction Block (RLY.3)
OPCU
20A OPU
BATT C/FAN 15A E/R Junction Block (RLY.2) E-Shifter2 10A SCU, Electronic Shift Switch (SBW) HPCU1 10A HPCU
Trailer2 20A Trailer Connector Unit
RR HTD 10A Driver Power Outside Mirror, Passenger Power Outside
Mirror
IG1 30A PCB Block (PDM(IG1) Relay)
IG2 30A PCB Block (PDM(IG2) Relay)
ECU3 10A CVVD Actuator, ECM
TCU2 15A TCM, OPU
IEB4 10A IEB Unit
Module 7.5A Electronic Water Pump (Engine) AEB 10A Front Radar
HPCU2 10A HPCU
Sensor1 20A Ignition Coil #1~#4
Sensor2 15A Oxygen Sensor (Up/Down) ECU1 20A ECM
Sensor4 10A E/R Junction Block (RLY.7)
Sensor3 10A Oil Control Valve #1~#2, Purge Control Solenoid Valve,
RCV Control Solenoid Valve, Variable Oil Pump, Cooling
Fan Motor