LEXUS NX 300H (2019 year). Manual — part 25

396

7-2. Steps to take in an emergency

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

“Engine Coolant Temp High” is
shown on the multi-information dis-
play

1

Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the hybrid system.

2

If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.

3

After the hybrid system has cooled
down sufficiently, inspect the hoses

and radiator core (radiator) for any
leaks.

Radiator
Cooling fans

If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.

4

The coolant level is satisfactory if it
is between the “FULL” and “LOW”
lines on the reservoir.

Reservoir
“FULL” line
“LOW” line

5

Add coolant if necessary.

Water can be used in an emergency if

If your vehicle overheats

The following may indicate that
your vehicle is overheating.
 The needle of the engine coolant

temperature gauge (

P.79)

enters the red zone, or a loss of
hybrid system power is experi-
enced. (For example, the vehicle
speed does not increase.)

 “Engine Coolant Temp High” or

“Hybrid System Overheated” is
shown on the multi-information
display.

 Steam comes out from under the

hood.

Correction procedures

A
B

A
B
C

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7-2. Steps to take in an emergency

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When trouble

ari

ses

coolant is unavailable.

6

Start the hybrid system and turn the
air conditioning system on to check
that the radiator cooling fans oper-
ate and to check for coolant leaks
from the radiator or hoses.

The fans operate when the air conditioning

system is turned on immediately after a

cold start. Confirm that the fans are oper-

ating by checking the fan sound and air

flow. If it is difficult to check these, turn the

air conditioning system on and off repeat-

edly.

(The fans may not operate in freezing tem-

peratures.)

7

If the fans are not operating:
Stop the hybrid system immediately
and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the
nearest Lexus dealer.

8

Check if “Engine Coolant Temp
High” is shown on the multi-infor-
mation display.
If the message does not disappear:
Stop the hybrid system and contact
your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the
nearest Lexus dealer.



If “Hybrid System Overheated” is
shown on the multi-information dis-
play

1

Stop the vehicle in a safe place.

2

Stop the hybrid system and care-
fully lift the hood.

3

After the hybrid system has cooled
down, inspect the hoses and radia-
tor core (radiator) for any leaks.

Radiator
Cooling fans

If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.

4

The coolant level is satisfactory if it
is between the “FULL” and “LOW”
lines on the reservoir.

Reservoir

“FULL” line
“LOW” line

5

Add coolant if necessary.

A
B

A
B
C

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7-2. Steps to take in an emergency

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Water can be used in an emergency if

coolant is unavailable.

6

After stopping the hybrid system
and waiting for 5 minutes or more,
start the hybrid system again and
check if “Hybrid System Over-
heated” is shown on the multi-infor-
mation display.

If the message does not disappear:

Stop the hybrid system and contact your

Lexus dealer.
If the message is not displayed:

The hybrid system temperature has

dropped and the vehicle may be driven

normally.

However, if the message appears again fre-

quently, contact your Lexus dealer.

WARNING

■

To prevent an accident or injury when

inspecting under the hood of your

vehicle

Observe the following precautions.

Failure to do so may result in serious

injury such as burns.

●

If steam is seen coming from under the

hood, do not open the hood until the

steam has subsided. The engine com-

partment may be very hot.

●

After the hybrid system has been

turned off, check that the “READY”

indicator is off. When the hybrid sys-

tem is operating, the gasoline engine

may automatically start, or the cooling

fan may suddenly operate even if the

gasoline engine stops. Do not touch or

approach rotating parts such as the

fan, which may lead to fingers or cloth-

ing (especially a tie, a scarf or a muf-

fler) getting caught, resulting in serious

injury.

●

Do not loosen the coolant reservoir

cap while the hybrid system and radia-

tor are hot.

High temperature steam or coolant

could spray out.

NOTICE

■

When adding engine/power control

unit coolant

Add coolant slowly after the hybrid sys-

tem has cooled down sufficiently. Adding

cool coolant to a hot hybrid system too

quickly can cause damage to the hybrid

system.

■

To prevent damage to the cooling sys-

tem

Observe the following precautions:

●

Avoid contaminating the coolant with

foreign matter (such as sand or dust

etc.).

●

Do not use any coolant additive.

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7-2. Steps to take in an emergency

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When trouble

ari

ses

1

Stop the hybrid system. Shift the
shift lever to P and set the parking
brake.

2

Remove the mud, snow or sand
from around the front wheels.

3

Place wood, stones or some other
material under the front wheels to
help provide traction.

4

Restart the hybrid system.

5

Shift the shift lever to D or R,
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal.

■

When it is difficult to free the vehicle

Press

to turn off TRAC. (

P.250)

If the vehicle becomes stuck

Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:

Recovering procedure

WARNING

■

When attempting to free a stuck vehi-

cle

If you choose to push the vehicle back

and forth to free it, make sure the sur-

rounding area is clear to avoid striking

other vehicles, objects or people. The

vehicle may also lunge forward or lunge

back suddenly as it becomes free. Use

extreme caution.

■

When shifting the shift lever

Be careful not to shift the shift lever with

the accelerator pedal depressed.

This may lead to unexpected rapid accel-

eration of the vehicle that may cause an

accident resulting in death or serious

injury.

NOTICE

■

To avoid damage to the hybrid trans-

mission and other components

●

Avoid spinning the front wheels and

depressing the accelerator pedal

more than necessary.

●

If the vehicle remains stuck even after

these procedures are performed, the

vehicle may require towing to be freed.

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Vehicle specifications

8-1. Specifications

Maintenance data (fuel, oil level,

etc.) . . . . . . . . . . . ..

402

Fuel information. . . . . . ..

410

Tire information. . . . . . ...

412

8-2. Customization

Customizable features. . . .

421

8-3. Initialization

Items to initialize . . . . . .

430

402

8-1. Specifications

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8-1.Specifications

*1

: Unladen vehicle

*2

: Vehicles with towing package

■

Vehicle identification number

The vehicle identification number
(VIN) is the legal identifier for your
vehicle. This is the primary identifica-
tion number for your Lexus. It is used in
registering the ownership of your vehi-
cle.
This number is stamped on the top left
of the instrument panel.

This number is also on the Certification
Label.

Maintenance data (fuel, oil level, etc.)

Dimensions and weight

Overall length

182.7 in. (4640 mm)

Overall width

72.6 in. (1845 mm)

Overall height

*1

64.8 in. (1645 mm)

Wheelbase

104.7 in. (2660 mm)

Tread

Front

62.2 in. (1580 mm)

Rear

62.2 in. (1580 mm)

Vehicle capacity weight
(Occupants + luggage)

895 lb. (405 kg)

Trailer Weight Rating

*2

(Trailer weight + cargo weight)

1500 lb. (685 kg)

Vehicle identification

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This number is also stamped under the
right-hand front seat.

■

Engine number

The engine number is stamped on the
engine block as shown.



Front

Engine

Model

2.5 L 4-cylinder (2AR-FXE)

Type

4-cylinder in line, 4-cycle, gasoline

Bore and stroke

3.54

 3.86 in. (90.0  98.0 mm)

Displacement

152.2 cu.in. (2494 cm

3

)

Valve clearance (engine cold)

Automatic adjustment

Drive belt tension

Automatic adjustment

Fuel

Fuel type

Unleaded gasoline only

Octane Rating

87 (Research Octane Number 91) or higher

Fuel tank capacity (Reference)

14.8 gal. (56 L, 12.3 Imp.gal.)

Electric motor (traction motor)

Type

Permanent magnet synchronous motor

Maximum output

105 kW

Maximum torque

199 ft•lbf (270 N•m, 27.5 kgf•m)

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

Rear

■

Oil capacity (Drain and refill [Reference*])

*

: The engine oil capacity is a reference quantity to be used when changing the engine oil.

Warm up the engine and turn off the hybrid system, wait more than 5 minutes, and check
the oil level on the dipstick.

■

Engine oil selection

“Toyota Genuine Motor Oil” is used in
your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil”
or equivalent to satisfy the following
grade and viscosity.
Oil grade: ILSAC GF-5 multigrade
engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the best choice for
good fuel economy and good starting
in cold weather.
If SAE 0W-20 is not available, SAE

5W-20 oil may be used. However, it
must be replaced with SAE 0W-20 at
the next oil change.

Outside temperature

Oil viscosity (0W-20 is explained here

Type

Permanent magnet synchronous motor

Maximum output

50 kW

Maximum torque

103 ft•lbf (139 N•m, 14.2 kgf•m)

Hybrid battery (traction battery)

Type

Nickel-Metal hydride battery

Voltage

7.2 V/module

Capacity

6.5 Ah (3HR)

Quantity

34 modules

Overall voltage

244.8 V

Lubrication system

With filter

4.6 qt. (4.4 L, 3.9 Imp.qt.)

Without filter

4.2 qt. (4.0 L, 3.5 Imp.qt.)

A

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as an example):
• The 0W in 0W-20 indicates the

characteristic of the oil which allows
cold startability. Oils with a lower
value before the W allow for easier
starting of the engine in cold
weather.

• The 20 in 0W-20 indicates the vis-

cosity characteristic of the oil when
the oil is at high temperature. An oil
with a higher viscosity (one with a
higher value) may be better suited if
the vehicle is operated at high
speeds, or under extreme load con-
ditions.

How to read oil container label:
The International Lubricant Specifica-
tion Advisory Committee (ILSAC)
Certification Mark is added to some oil
containers to help you select the oil you
should use.

*

: The coolant capacity is the quantity of reference.

If replacement is necessary, contact your Lexus dealer.

Cooling system

Capacity

*

Gasoline
engine



Vehicles with towing package

7.7 qt. (7.3 L, 6.4 Imp.qt.)



Vehicles without towing package

7.1 qt. (6.7 L, 5.9 Imp.qt.)

Power con-
trol unit

3.3 qt. (3.1 L, 2.7 Imp.qt.)

Coolant type

Use either of the following:
 “Toyota Super Long Life Coolant”

 Similar high-quality ethylene glycol-based non-

silicate, non-amine, non-nitrite, and nonborate
coolant with long-life hybrid organic acid tech-
nology

Do not use plain water alone.

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■

Spark plug

■

12-volt battery

■

Charging rates

*

: The fluid capacity is the quantity of reference.

If replacement is necessary, contact your Lexus dealer.

Ignition system

Make

DENSO FK16HR-A8

Gap

0.03 in. (0.8 mm)

NOTICE

■

Iridium-tipped spark plugs

Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

Electrical system

Specific voltage reading
at 68°F (20°C):

12.0 V or higher
If the voltage is lower than the standard value,
charge the battery.
(After charging the battery, turn on the high beam
headlights for 30 seconds with the power switch
off, and turn the headlights off.)

Quick charge
Slow charge

15 A max.
5 A max.

Hybrid transmission

Fluid capacity

*



Front

4.0 qt. (3.8 L, 3.3 Imp.qt.)

Fluid type

Toyota Genuine ATF WS

NOTICE

■

Transmission fluid type

Using transmission fluid other than “Toyota Genuine ATF WS” may ultimately damage

the hybrid transmission of your vehicle.

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*

: The fluid capacity is the quantity of reference.

If replacement is necessary, contact your Lexus dealer.

*

: Minimum pedal clearance when depressed with a force of 110 lbf (490 N, 50.0 kgf)

while the hybrid system is operating.

Rear differential (Rear electric motor)

Fluid capacity

*

1.9 qt. (1.8 L, 1.6 Imp.qt.)

Fluid type

Toyota Genuine ATF WS

NOTICE

■

Transmission fluid type

Using transmission fluid other than “Toyota Genuine ATF WS” may cause deterioration in

shift quality, locking up of your transmission accompanied by vibration, and ultimately

damage the transmission of your vehicle.

Brakes

Pedal clearance

*

4.13 in. (105 mm) Min.

Brake pad wear limit

0.04 in. (1.0 mm)

Pedal free play

0.04 — 0.24 in. (1.0 — 6.0 mm)

Fluid type

• FMVSS No. 116 DOT 3 or SAE J1703
• FMVSS No. 116 DOT 4 or SAE J1704

Steering

Free play

Less than 1.2 in. (30 mm)

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

Type A



Type B

Tires and wheels

Tire size

225/65R17 102H

Tire inflation pressure
(Recommended cold tire inflation
pressure)

Driving under normal conditions



Front

35 psi (240 kPa, 2.4 kgf/cm

2

or bar)



Rear

35 psi (240 kPa, 2.4 kgf/cm

2

or bar)

Driving at high speeds (above 100 mph [160 km/
h]) (in countries where such speeds are permitted
by law)

Add 1 psi (10 kPa, 0.1 kgf/cm

2

or bar) to the front

and rear tires. Never exceed the maximum cold tire
inflation pressure indicated on the tire sidewall.

Wheel size

17

 7 J

Wheel nut torque

76 ft•lbf (103 N•m, 10.5 kgf•m)

Tire size

225/60R18 100H

Tire inflation pressure
(Recommended cold tire inflation
pressure)

Driving under normal conditions



Front

32 psi (220 kPa, 2.2 kgf/cm

2

or bar)



Rear

32 psi (220 kPa, 2.2 kgf/cm

2

or bar)

Driving at high speeds (above 100 mph [160 km/
h]) (in countries where such speeds are permitted
by law)

Add 9 psi (60 kPa, 0.6 kgf/cm

2

or bar) to the front

and rear tires. Never exceed the maximum cold tire
inflation pressure indicated on the tire sidewall.

Wheel size

18

 7 1/2 J

Wheel nut torque

76 ft•lbf (103 N•m, 10.5 kgf•m)

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Compact spare tire

A: Wedge base bulbs (clear)
B: Wedge base bulbs (amber)

*

: If equipped

Tire size

T165/80D17 104M

Spare tire inflation pressure
(Recommended cold tire inflation
pressure)

60 psi (420 kPa, 4.2 kgf/cm

2

or bar)

Wheel size

17

 4 T

Wheel nut torque

76 ft•lbf (103 N•m, 10.5 kgf•m)

Light bulbs

Light bulbs

Bulb No.

W

Type

Exterior

Front side marker lights (bulb
type)

W5W

5

A

Front turn signal lights (bulb
type)*

585

(WY21W)

21

B

Interior

Vanity lights



8

A

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Gasoline quality

In very few cases, driveability problems may

be caused by the brand of gasoline you are

using. If driveability problems persist, try

changing the brand of gasoline. If this does

not correct the problem, consult your Lexus

dealer.

■

Recommendation of the use of gasoline

containing detergent additives

●

Lexus recommends the use of gasoline

that contains detergent additives to avoid

the build-up of engine deposits.

●

All gasoline sold in the U.S.A. contains

minimum detergent additives to clean

and/or keep clean intake systems, per

EPA’s lowest additives concentration pro-

gram.

●

Lexus strongly recommends the use of

Top Tier Detergent Gasoline. For more

information on Top Tier Detergent Gaso-

line and a list of marketers, please go to

the official website www.toptiergas.com.

■

Recommendation of the use of low

emissions gasoline

Gasolines containing oxygenates such as

ethers and ethanol, as well as reformulated

gasolines, are available in some cities.

These fuels are typically acceptable for use,

providing they meet other fuel require-

ments.

Lexus recommends these fuels, since the

formulations allow for reduced vehicle

emissions.

■

Non-recommendation of the use of

blended gasoline

●

Use only gasoline containing up to 15%
ethanol.
DO NOT use any flex-fuel or gasoline
that could contain more than 15% etha-
nol, including from any pump labeled
E30 (30% ethanol

), E50 (50% etha-

nol

), E85 (85% ethanol

) (which

are only some examples of fuel contain-
ing more than 15% ethanol).

●

If you use gasohol in your vehicle, be sure

that it has an octane rating no lower than

87.

●

Lexus does not recommend the use of

gasoline containing methanol.

■

Non-recommendation of the use of gas-

oline containing MMT

Some gasoline contains an octane enhanc-

ing additive called MMT (Methylcyclopen-

tadienyl Manganese Tricarbonyl).
Lexus does not recommend the use of gas-

oline that contains MMT. If fuel containing

MMT is used, your emission control system

may be adversely affected.
The malfunction indicator lamp on the

instrument cluster may come on. If this hap-

pens, contact your Lexus dealer for service.

■

If your engine knocks

●

Consult your Lexus dealer.

●

You may occasionally notice light knock-

ing for a short time while accelerating or

driving uphill. This is normal and there is

no need for concern.

Fuel information

You must only use unleaded gaso-
line in your vehicle.
Select octane rating 87 (Research
Octane Number 91) or higher. Use
of unleaded gasoline with an octane
rating lower than 87 may result in
engine knocking. Persistent knock-
ing can lead to engine damage.
At minimum, the gasoline you use
should meet the specifications of
ASTM D4814 in the U.S.A.

A

B

C

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NOTICE

■

Notice on fuel quality

●

Do not use improper fuels. If improper

fuels are used, the engine will be dam-

aged.

●

Do not use leaded gasoline.

Leaded gasoline can cause damage to

your vehicle’s three-way catalytic con-

verters causing the emission control sys-

tem to malfunction.

●

Do not use gasohol other than the type

previously stated.

Other gasohol may cause fuel system

damage or vehicle performance prob-

lems.

●

Using unleaded gasoline with an

octane number or rating lower than

the level previously stated will cause

persistent heavy knocking.

At worst, this will lead to engine dam-

age.

■

Fuel-related poor driveability

If poor driveability (poor hot starting,

vaporization, engine knocking, etc.) is

encountered after using a different type

of fuel, discontinue the use of that type of

fuel.

■

When refueling with gasohol

Take care not to spill gasohol. It can dam-

age your vehicle’s paint.