2023 HYUNDAI NEXO Fuel cell

7-56
Maintenance
TypeFuse NameFuse RatingCircuit Protected
FUSE
BHDC7.5AIDC
HMU110AHMU
BATTERY
MANAGEMENT10ABMS Control Module
FUEL CELL
CONTROL UNIT15AFCU
BMS FAN15APE Room Junction Block (BMS FAN Relay)
Motor compartment fuse panel

7-63
7
Maintenance
Do not use strong soap, chemi-cal detergents or hot water, and
do not wash the vehicle in direct
sunlight or when the body of the
vehicle is warm.
Be careful when washing the side windows of your vehicle.
Especially, with high-pressure
water, water may leak through
the windows and wet the interi-
or.
To prevent damage to the plastic parts, do not clean with chemi-
cal solvents or strong deter-
gents. Water washing in the fuel cell
power module compartment
including high pressure water
washing may cause the failure
of electrical circuits located in
the fuel cell power module com-
partment.
Never allow water or other liquids to come in contact with electri-
cal/electronic components inside
the vehicle as this may damagethem. Matte paint finish vehicle
Automatic car wash which uses
rotating brushes should not be
used as this can damage the sur-
face of your vehicle. A steam
cleaner which washes the vehicle
surface at high temperature may
result the oil to adhere and leave
stains that is difficult to remove.
Use a soft cloth (e.g. microfiber
towel or sponge) when washing
your vehicle and dry with a
microfiber towel. When you hand
wash your vehicle, you should not
use a cleaner that finishes with
wax. If the vehicle surface is too
dirty (sand, dirt, dust, contami-
nant, etc.), clean the surface with
water before washing the car.
NOTICE
NOTICE
NOTICE
OFE078045N

8-6
Specifications and Reporting Safety DefectsR
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To help achieve proper vehicle performance and durability, use only lubricants of the proper quality.
These lubricants and fluids are recommended for use in your vehicle.
Lubricant Volume Classification
Reduction gear fluid 1
l(1.06 US qt)
GL4 75W/85, TGO-9
Coolant Fuel cell stack
We recommend that you consult an authorized Hyundai dealer.
Traction motor
Brake fluid Amount required SAE J1704 DOT-4LV,
FMVSS116 DOT-4,ISO4925 CLASS-6
Fuel 156.6
l(165.48 US qt.)
Hydrogen (SAE J2719 or ISO 14687-2)

Introduction of FCEV .........................................................H2
The components of FCEV..................................................H3Fuel cell stack ..................................................................................H4
FCEV powertrain...............................................................................H4
High pressure hydrogen storage tanks ......................................H5
Battery system..................................................................................H5
Features of FCEV .............................................................H10 How to Start the Vehicle ..............................................................H10
How to Stop the Vehicle ..............................................................H11
Virtual Engine Sound System......................................................H11
Fuel filler door ................................................................................H12
Warning and indicator lights .......................................................H15
LCD Display Messages ..................................................................H16
FCEV mode.......................................................................................H21
When the high voltage battery is weak ...................................H25
If the 12 volt battery is discharged...........................................H25
Emergency while driving ..............................................................H26
Customer Q&A Guide .......................................................H30
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FCEV : Fuel Cell Electric Vehicle

H2
An FCEV is an electric vehicle which is driven using the electricity generated from the fuel cell.
The power system of the FCEV is composed of the following:
- The fuel cell stack which generates the electricity
- The device which controls the heat generated after supplying the hydrogen and air for chemical reaction of the stack
- The inverter which converts the DC created from the stack to AC
- The traction motor which generates propelling power using the supplied AC- Air processing system- Fuel processing system
The hydrogen tanks that stores the hydrogen supplied to the fuel cell can be fueled at 70 MPa. ❈FCEV is Fuel Cell Electric Vehicle
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H3
TTHH EE CC OO MM PPOO NNEENN TTSS OO FF FF CC EE VV
OFEQ018001N/OFEQ018002/OFEQ018003/OFEQ018004/OFEQ018005
(1) Fuel Cell system
(2) Traction motor system (3) Hydrogen Tanks
(4) Battery System
12
34

H4
1. Fuel cell stack
A fuel cell stack is a device that con-
verts the chemical energy into elec-
tricity thorough a chemical reaction
with hydrogen and oxygen. Fuel cell
is different from battery in that it
requires hydrogen and oxygen con-
stantly in order to operate. And it can
produce electricity continually for as
long as hydrogen and oxygen are
supplied. A fuel cell stack is com-
posed of many unit cells to obtain the
desired power for a vehicle.
2. FCEV powertrain
1. High voltage junction box
2. Fuel cell stack
3. Traction motor4. Reduction gear
5. Air compressor The main components of FCEV are
Fuel cell stack, air processing sys-
tem, fuel processing system, thermal
management system, hydrogen stor-
age tank, high voltage battery, DC-
DC converter, inverter and traction
motor, gear differential unit. The Air compressor supplies air to fuel
cell system and the hydrogen storage
tank supplies hydrogen fuel to fuel cell
system. Then the electric energycomes from the fuel cell system.
The electric energy deliveried to the
motor inverter. The energy finally
moves to motor operating.
TT
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OFEQ018006NOFEQ018007
OFEQ018008
If you assemble or disassemble
the stack and fuel cell system,
hydrogen may leak resulting in
fire and this may lead to acci-
dents. Never assemble or disas-
semble the stack and fuel cellsystem.
WARNING

H5
3. High pressure hydrogenstorage tanks
Compressed hydrogen tank system is composed of three tanks which
are filled with hydrogen gas in a gas
station. Each tank is made of plastic
liner for blocking the hydrogen per-
meation and carbon fiber layer sus-
tain high pressures.
There are main parts to supply
hydrogen stably and to enable safety
such as magnetic valves, pressure
regulator, pressure sensors, pres-
sure relief valve, excess flow valve
and so on. The hydrogen in the tankscomes into the pressure regulator
which has a pressure sensor.
4. Battery system
A 12 V battery integrated with the low
and high voltage batteries is installed
in the vehicle. The battery supplies
the electricity required for driving the
vehicle and stores the energy gener-
ated from the regenerative braking.
When the vehicle accelerates the
auxiliary power of the fuel cell sup-
plies the energy. The vehicle can
drive about 3 km (2 miles) in EV
mode until the high voltage battery isdischarged.
High voltage cables
The electric energy which is generat-
ed from fuel cell system or high volt-
age battery module is distributed to
the various components. Most of the
cables are located in the inside or bot-
tom of the components. These cables
use orange colored cover to distin-
guish from other lines. It is required to
handle the cables carefully with isola-
tion gloves.
OFEQ018004
OFEQ018005