2021 HYUNDAI TUCSON HYBRID engine

Foreword / Hybrid System Overview
1-12
Hybrid system gauge
Power gauge
„„4.2-Inch
ONX4H040004
„„10.25-inch
OCN7H040002
The hybrid system gauge indicates
whether the current driving condition is
fuel efficient or not.
• CHARGE:
Shows that the energy made by the
vehicle is being converted to electrical
energy. (Regenerated energy)
• ECO:
Shows that the vehicle is being driven
in an Eco-friendly manner.
• POWER:
Shows that the vehicle is exceeding
the Eco-friendly range.
According to the hybrid system gauge
area, the “EV” indicator comes on or off.
- “EV” indicator ON : Vehicle is driven
using the electric motor or the
gasoline engine is stopped.
-“EV” indicator OFF : Vehicle is driven
using the gasoline engine.
Hybrid battery SOC (State of Charge)
gauge
„„4.2-Inch
ONX4HQ010016N
„„10.25-inch
OCN7H040003
This gauge indicates the remaining
hybrid battery power. If the SOC is
near the “L (Low)” level, the vehicle
automatically operates the engine to
charge the battery.
However, if the Service Indicator (
)
and Malfunction Indicator Lamp (MIL)
(
) turn on when the SOC gauge is near
the “L (Low)” level, we recommend the
vehicle be checked by an authorized
HYUNDAI dealer.

01
1-13
Warning and indicator lights
Ready indicator
This indicator illuminates:
When the vehicle is ready to be driven.
-ON : Normal driving is possible.
-OFF : Normal driving is not possible,
or a problem has occurred.
-Blinking : Emergency driving.
When the ready indicator goes OFF
or blinks, there is a problem with the
system. If this occurs, we recommend
that you have your vehicle inspected by
an authorized HYUNDAI dealer.
EV mode indicator
This indicator illuminates:
When the vehicle is driven by the electric
motor.
Service warning light
This warning light illuminates:
• When you set the ignition switch or
the Engine Start/Stop button to the
ON position.
-The service warning light illuminates
for approximately 3 seconds and
then turns off when all checks have
been performed.
• When there is a problem with the
hybrid vehicle control system or
hardware.
When the warning light illuminates
while driving, or does not go OFF after
starting the vehicle, we recommend that
you have the vehicle inspected by an
authorized HYUNDAI dealer.
Regenerative brake warning
light
(yellow)
This warning light illuminates:
When the regenerative brake does not
operate and the brake does not perform
well. This causes the Brake Warning
light (red) and Regenerative Brake
Warning Light (yellow) to illuminate
simultaneously.
If this occurs, drive safely and have
your vehicle inspected by an authorized
HYUNDAI dealer. The operation of the
brake pedal may be more difficult than
normal and the braking distance may
increase.

01
1-15
Stop safely and check Hybrid system
OOSHQ019007L
This message is displayed when there
is a problem with the hybrid control
system. The “
” indicator will blink
and a warning chime will sound for
approximately 10 seconds until the
problem is solved. Refrain from driving
when the warning message is displayed.
If this occurs, we recommend that
you have the vehicle inspected by an
authorized HYUNDAI dealer.
Check Hybrid system. Do not start
engine
OOSHQ019008L
This message is displayed when the
hybrid battery power (SOC) level is low.
A warning chime will sound until the
problem is solved. Refrain from driving
when the warning message is displayed.
If this occurs, we recommend that
you have the vehicle inspected by an
authorized HYUNDAI dealer.
Stop safely and check power supply
OOSHQ019009L
This message is displayed when a failure
occurs in the power supply system.
If this occurs, park the vehicle in a safe
location and tow your vehicle to the
nearest authorized HYUNDAI dealer and
have the vehicle inspected.
Check virtual engine sound system
OOSHQ019010L
This message is displayed when there is
a problem with the Virtual Engine Sound
System (VESS).
If this occurs, we recommend that
you have the vehicle inspected by an
authorized HYUNDAI dealer.

Foreword / Hybrid System Overview
1-16
Refill inverter coolant
OOSHQ019012L
This message is displayed when the
inverter coolant is nearly empty.
You should refill the inverter coolant.
Park with engine On to charge
battery
OOSHQ019013L
This message is displayed when the
hybrid battery power (SOC) level is low.
If this occurs, park the vehicle in a safe
location and wait until the hybrid battery
is charged.
Start engine to avoid battery
discharge
OOSHQ019027L
This message is displayed to inform the
driver the 12V battery may be discharged
if the ignition switch is in ON position
(without the
indicator ON).
Set the vehicle to the ready () mode
to prevent the 12V battery from being
discharged.

01
1-17
Energy flow
The hybrid system informs the drivers its
energy flow in various operating modes.
While driving, the current energy flow is
specified in 11 modes.
Vehicle stop
ONX4E040024
The vehicle is stopped.
(No energy flow)
EV propulsion
ONX4EHQ010002
Only the motor power is used to drive the
vehicle.
(Battery → Wheel)
Power assist
ONX4EHQ010003
Both the motor and the engine power are
used to drive the vehicle.
(Battery & Engine → Wheel)
Engine only propulsion
ONX4EHQ010004
Only the engine power is used to drive
the vehicle.
(Engine → Wheel)

Foreword / Hybrid System Overview
1-18
Engine generation
ONX4EHQ010005
When the vehicle is stopped, the high-
voltage battery is charged up by the
engine.
(Engine → Battery)
Regeneration
ONX4EHQ010006
The high-voltage battery is charged up
by the regenerative brake system.
(Wheel → Battery)
Engine brake
ONX4EHQ010007
The engine braking is used to decelerate
the vehicle.
(Wheel → Engine)
Power reserve
ONX4EHQ010008
The engine is simultaneously used to
drive the vehicle and to charge up the
high-voltage battery.
(Engine → Wheel & Battery)

01
1-19
Engine generation/motor drive
ONX4EHQ010009
The engine charges up the high-voltage
battery. The motor power is used to drive
the vehicle.
(Engine → Battery → Wheel)
Engine generation/regeneration
ONX4E040025
The engine and regenerative brake
system charges up the high-voltage
battery.
(Engine & Wheel → Battery)
Engine brake/regeneration
ONX4EHQ010010
The engine braking is simultaneously
used to decelerate the vehicle and to
charge up the high-voltage battery.
(Wheel → Engine & Battery)

01
1-21
SAFETY PRECAUTIONS FOR HYBRID SYSTEM
Hybrid vehicle components
High voltage battery system
„„HPCU (Hybrid Power Control Unit) *1
OTMHQ010013
„„High voltage battery system *2
ONX4HQ010012
*1 : Located in the engine compartment
*2 : Located under the rear seat
WARNING
Never touch orange colored or high
voltage labeled components, including
wires, cables, and connections. When
the insulators or covers are damaged or
removed, severe injury or death from
electrocution may occur.
WARNING
While replacing the fuses in the
engine compartment, never touch the
HPCU. The HPCU carries high voltage.
Touching the HPCU may result in
electrocution, serious injury, or death.
WARNING
In the hybrid system, the hybrid battery
uses high voltage to operate the motor
and other components. This high
voltage hybrid battery system can be
very dangerous.
Never touch the hybrid system. When
you touch the hybrid battery system,
serious injury or death may occur.
CAUTION
• Do not pile up any items in an area
behind the high voltage battery. In
a crash, the battery may become
unstable, or its performance may
degrade.
• Do not apply strong force nor pile
up any items above the luggage
compartment. Such an attempt
may distort the high voltage battery
case, causing a safety problem or
degrading the performance.
• Be careful when loading
flammable liquid in the passenger
compartment. It could cause
operational and safety degradation if
the liquid leaks and flows in the high
voltage battery.
„„Drive motor *3
OTMHQ010015
*3 : Located in the engine compartment