ECU INFINITI QX55 2023 Workshop Manual

•Drive carefully when off the road and
avoid dangerous areas. Every person
who drives or rides in this vehicle should
be seated with their seat belt fastened.
This will keep you and your passengers in
position when driving over rough terrain.
• Do not drive across steep slopes. Instead
drive either straight up or straight down
the slopes. Off-road vehicles can tip over
sideways much more easily than they can
forward or backward.
• Many hills are too steep for any vehicle.
If you drive up them, you may stall. If you
drive down them, you may not be able to
control your speed. If you drive across
them, you may roll over.
• Do not shift gears while driving on
downhill grades as this could cause loss
of control of the vehicle.
• Stay alert when driving to the top of a
hill. At the top there could be a drop-off
or other hazard that could cause an
accident.
• If your engine stalls or you cannot make
it to the top of a steep hill, never attempt
to turn around. Your vehicle could tip or
roll over. Always back straight down in R
(Reverse) gear and apply brakes to con-
trol your speed. •
Heavy braking going down a hill could
cause your brakes to overheat and fade,
resulting in loss of control and an acci-
dent. Apply brakes lightly and use a low
gear to control your speed.
• Unsecured cargo can be thrown around
when driving over rough terrain. Prop-
erly secure all cargo so it will not be
thrown forward and cause injury to you
or your passengers.
• Secure heavy loads in the cargo area as
far forward and as low as possible. Do
not equip the vehicle with tires larger
than specified in this manual. This could
cause your vehicle to roll over.
• Do not grip the inside or spokes of the
steering wheel when driving off-road.
The steering wheel could move suddenly
and injure your hands. Instead drive with
your fingers and thumbs on the outside
of the rim.
• Before operating the vehicle, ensure that
the driver and all passengers have their
seat belts fastened.
• Always drive with the floor mats in place
as the floor may become hot. •
Lower your speed when encountering
strong crosswinds. With a higher center
of gravity, your INFINITI is more af-
fected by strong side winds. Slower
speeds ensure better vehicle control.
• Do not drive beyond the performance ca-
pability of the tires, even with AWD
engaged.
• For AWD equipped vehicles, do not at-
tempt to raise two wheels off the ground
and shift the transmission to any drive or
reverse position with the engine running.
Doing so may result in drivetrain damage
or unexpected vehicle movement which
could result in serious vehicle damage or
personal injury.
• Do not attempt to test an AWD
equipped vehicle on a 2-wheel dyna-
mometer (such as the dynamometers
used by some states for emissions test-
ing) or similar equipment even if the
other two wheels are raised off the
ground. Make sure you inform test facil-
ity personnel that your vehicle is
equipped with AWD before it is placed
on a dynamometer. Using the wrong test
equipment may result in drivetrain dam-
age or unexpected vehicle movement
which could result in serious vehicle dam-
age or personal injury.
Starting and driving5-11

WARNING
Do not operate the push-button ignition
switch while driving the vehicle except in
an emergency. (The engine will stop when
the ignition switch is pushed three con-
secutive times in quick succession or the
ignition switch is pushed and held for more
than 2 seconds.) If the engine stops while
the vehicle is being driven, this could lead
to a crash and serious injury.
When the ignition switch is pushed without
depressing the brake pedal, the ignition
switch will change as follows:
Push the ignition switch center:
• Once to change to ON.
• Two times to change to OFF.
The ignition switch will automatically return
to the LOCK position when any door is either
opened or closed with the switch in the OFF
position.
The ignition lock is designed so that the igni-
tion switch cannot be placed in the OFF po-
sition until the shift position is in the P (Park)
position. When the ignition switch cannot be placed in
the OFF position, proceed as follows:
1. Press the Park button to place the vehicle
in the P (Park) position.
2. Push the ignition switch. The ignition switch position will change to the ON
position.
3. Push the ignition switch again to the OFF position.
The shift position can be shifted from the P
(Park) position if the ignition switch is in the
ON position and the brake pedal is
depressed.
If the battery of the vehicle is discharged, the
ignition switch cannot be moved from the
LOCK position.
Some indicators and warnings for operation
are displayed on the vehicle information dis-
play. For additional information, see “Vehicle
information display” (P. 2-19).
LSD2911
PUSH-BUTTON IGNITION SWITCH
Starting and driving5-13

AUTO ACC
With the vehicle in the P (Park) position, the
Intelligent Key with you and the ignition
switch placed from the ON position to the
OFF position, the radio can still be used for a
period of time, or until the driver’s door is
opened.
After a period of time, functions such as ra-
dio, navigation, and Bluetooth® Hands-Free
Phone System may be restarted by pressing
the POWER button/VOLUME control knob
or the key fob unlock button. For additional
information, see the “Monitor, climate, audio,
phone and voice recognition systems”
(P. 4-2).
EMERGENCY ENGINE SHUT OFF
To shut off the engine in an emergency situ-
ation while driving, perform the following
procedure:
• Rapidly push the ignition switch three con-secutive times in less than 1.5 seconds, or
• Push and hold the ignition switch for more than 2 seconds.
INFINITI INTELLIGENT KEY
BATTERY DISCHARGE
If the battery of the Intelligent Key is dis-
charged or environmental conditions inter-
fere with the Intelligent Key operation, start
the engine according to the following proce-
dure:
1. Press the Park button to place the vehicle in the P (Park) position.
2. Firmly apply the foot brake.
3. Touch the ignition switch with the Intelli- gent Key as illustrated. (A chime will
sound.) 4. Push the ignition switch while depressing
the brake pedal within 10 seconds after
the chime sounds. The engine will start.
After step 3 is performed, when the ignition
switch is pushed without depressing the
brake pedal, the ignition switch position will
change to ON.
NOTE:
• When the ignition switch is placed in the ON position or the engine is started by the
above procedure, the Intelligent Key bat-
tery discharge indicator may appear in the
vehicle information display even when the
Intelligent Key is inside the vehicle. This is
not a malfunction. To turn off the Intelli-
gent Key battery discharge indicator,
touch the ignition switch with the Intelli-
gent Key again.
• If the Intelligent Key battery discharge in- dicator appears, replace the battery as
soon as possible. For additional informa-
tion, see “Battery replacement” (P. 8-22).
LSD3572
Starting and driving5-15

–Moving the shift lever to the R (Re-
verse) position when driving forward.
– Moving the shift lever to the D (Drive)
position when reversing.
If these operations are attempted, a chime
sounds and the vehicle shifts to the N (Neu-
tral) position.
P (Park)
CAUTION
• To prevent transmission damage, use the
P (Park) position only when the vehicle is
completely stopped.
• Do not slide the shift lever while pressing
the Park button. This may damage the
shift control system.
Use this position when the vehicle is parked
or starting the engine. Always make sure that
the vehicle is completely stopped before
pressing the Park button
O1to engage the P
(Park) position. For maximum safety, the
brake pedal must be depressed before en-
gaging the P (Park) position. Use this position
together with the parking brake. When park-
ing on a hill, first depress the brake pedal,
apply the parking brake and then engage the
P (Park) position. The parking lock should not
be used as a brake when parking. In order to secure the vehicle, always apply the elec-
tronic parking brake in addition to the parking
lock.
In the event of a malfunction of the vehicle’s
electronics, the transmission may lock in the
P (Park) position. Have the vehicle’s electron-
ics checked immediately. It is recommended
that you visit an INFINITI retailer for this
service.
The P (Park) position is automatically en-
gaged if:
• You switch off the ignition switch.
• You unfasten the driver’s seat belt and
open the driver’s door when the vehicle is
stationary or driving at a very low speed
and the transmission is in the D (Drive) po-
sition or R (Reverse) position.
R (Reverse)
CAUTION
To prevent transmission damage, use the R
(Reverse) position only when the vehicle is
completely stopped. Use the R (Reverse) position to back up. Make
sure the vehicle is completely stopped before
selecting the R (Reverse) position.
The brake
pedal must be depressed and the shift lever
button pressed to move the shift lever from
the home position to R (Reverse).
If the vehicle is placed in the R (Reverse)
position while forwarding, the chime will
sound and the vehicle will switch into the N
(Neutral) position.
N (Neutral)
Neither forward nor reverse gear is engaged.
The engine can be started in this position. You
may shift to N (Neutral) and restart a stalled
engine while the vehicle is moving. You can
select this position by holding the shift lever
at this position for 0.5 seconds.
D (Drive)
Use this position for all normal forward driv-
ing. The CVT changes gears automatically. All
forward gears are available. If the vehicle is
placed in the D (Drive) position while revers-
ing, the chime will sound and the vehicle will
switch into the N (Neutral) position.
5-20Starting and driving

WARNING
• The electronic parking brake will not be
automatically applied when the engine is
stopped without using the ignition
switch (for example, by engine stalling).
Without the vehicle stationary, the elec-
tronic parking brake will not be auto-
matically applied even if the engine is
turned off with the ignition switch.
• Before leaving the vehicle, press the Park
button to place the vehicle in the P (Park)
position and check that the electronic
parking brake indicator light (red) is illu-
minated to confirm that the electronic
parking brake is applied. The electronic
parking brake indicator light (red) will
remain on for a period of time after the
driver’s door is locked.
CAUTION
When parking in an area where the outside
temperature is below 32°F (0°C), the park-
ing brake, if applied, may freeze in place
and may be difficult to release.
For safe parking, it is recommended that
you place the shift position in the P (Park)
position and securely block the wheels.
NOTE:
• If a malfunction occurs in the electronic parking brake system (for example, due to
battery discharge), it is recommended that
you visit an INFINITI retailer.
• If the shift position is shifted to the P (Park) position when the brake force is
maintained by the automatic brake hold
function, the electronic parking brake will
apply automatically.
• If the driver’s seat belt is unfastened when the brake force is maintained by the auto-
matic brake hold function, the electronic
parking brake will apply automatically.
• If the ignition switch is placed in the OFF position when the brake force is main-
tained by the automatic brake hold func-
tion, the electronic parking brake will ap-
ply automatically.
• Under the following conditions, the elec- tronic parking brake will automatically be
applied and the brake force of the auto-
matic brake hold will be released:
– The brake force is applied by the auto- matic brake hold function for 3 minutes
or longer.
– The vehicle is in the P (Park) position.
– The electronic parking brake is applied manually.
– The driver’s seat belt is unfastened. – The ignition switch is placed in the OFF
position.
– A malfunction occurs in the automatic brake hold function.
MANUAL OPERATION
The electronic parking brake will not be auto-
matically applied if the engine is stopped
without using the ignition switch (for ex-
ample, by engine stalling). In such a case, you
have to apply the parking brake manually.
To apply: Pull the switch up
O1. The indicator
light
OAwill illuminate.
To release: With the ignition switch in the ON
position, depress the brake pedal and push
the switch down
O2. The indicator lightOAwill turn off.
Before driving, check that the electronic
parking brake indicator light (red) (if so
equipped)
orgoes out. For addi-
tional information, see “Warning lights, indi-
cator lights and audible reminders” (P. 2-9).
NOTE:
• A buzzer will sound if the vehicle is driven without releasing the parking brake. For
additional information, see “Warning
lights, indicator lights and audible remind-
ers” (P. 2-9).
Starting and driving5-25

To shut off the engine in an emergency situ-
ation while driving, perform the following
procedure:
– Rapidly push the push-button ignitionswitch three consecutive times in less than
1.5 seconds, or
– Push and hold the push-button ignition switch for more than 2 seconds.TIRE PRESSURE MONITORING
SYSTEM (TPMS)
This vehicle is equipped with Tire Pressure
Monitoring System (TPMS). It monitors tire
pressure of all tires. When the low tire pres-
sure warning light is lit, and the “Tire Pressure
Low - Add Air” or “Flat Tire-Visit dealer” (if so
equipped) warning appears in the vehicle in-
formation display, one or more of your tires is
significantly under-inflated. The system also
displays pressure of all tires (except the spare
tire) on the vehicle information display screen
by sending a signal from a sensor that is
installed in each wheel. If the vehicle is being
driven with low tire pressure, the TPMS will
activate and warn you of it by the low tire
pressure warning light. This system will acti-
vate only when the vehicle is driven at speeds
above 16 mph (25 km/h). For additional in-
formation, see “Warning lights, indicator
lights and audible reminders” (P. 2-9) and
“Tire Pressure Monitoring System (TPMS)”
(P. 8-27).
WARNING
• Radio waves could adversely affect elec-
tric medical equipment. Those who use a
pacemaker should contact the electric
medical equipment manufacturer for the
possible influences before use. •
If the low tire pressure warning light illu-
minates while driving, avoid sudden
steering maneuvers or abrupt braking,
reduce vehicle speed, pull off the road to
a safe location and stop the vehicle as
soon as possible. Driving with under-
inflated tires may permanently damage
the tires and increase the likelihood of
tire failure. Serious vehicle damage could
occur and may lead to an accident and
could result in serious personal injury.
Check the tire pressure for all four tires.
Adjust the tire pressure to the recom-
mended COLD tire pressure shown on
the Tire and Loading Information label to
turn the low tire pressure warning light
OFF. If the light still illuminates while
driving after adjusting the tire pressure,
a tire may be flat or the TPMS may be
malfunctioning. If you have a flat tire,
replace it with a replacement tire as soon
as possible. If no tires are flat and all tires
are properly inflated, have the vehicle
checked. It is recommended that you
visit an INFINITI retailer for this service.
EMERGENCY ENGINE SHUT OFF FLAT TIRE
In case of emergency6-3

•Properly position the mats in the floor-
well using the floor mat positioning
hook. For additional information, see
"Floor mat installation" (P. 7-6).
• Make sure the floor mat does not inter-
fere with pedal operation.
• Periodically check the floor mats to make
sure they are properly installed.
• After cleaning the vehicle interior, check
the floor mats to make sure they are
properly installed.
The use of Genuine INFINITI floor mats can
extend the life of your vehicle carpet and
make it easier to clean the interior. Mats
should be maintained with regular cleaning
and replaced if they become excessively
worn.
Floor mat installation
Your vehicle is equipped with floor mat re-
tainer clips. The number and shape of the
floor mat retainer clips for each seating posi-
tion varies depending on the vehicle. When installing Genuine INFINITI floor mats,
follow the installation instructions provided
with the mat and the following:
1. With the ignition switch in the OFF posi-
tion, the shift position in P (Park) position
and with the parking brake fully applied,
position the floor mat in the floorwell so
that the floor mat grommet holes are
aligned with the retainer clips.
2. Secure the grommet holes into the clips and ensure that the floor mat is properly
positioned.
3. Make sure the floor mat does not inter- fere with pedal operation. With the igni-
tion switch still in the OFF position, the
shift position in the P (Park) position and
with the parking brake applied, fully apply
and release all pedals. The floor mat must
not interfere with pedal operation or pre-
vent the pedal from returning to its normal
position.
It is recommended that you visit an INFINITI
retailer for details about installing the floor
mats in your vehicle. The illustration shows the location of the
floor mat retainer clips.
SEAT BELTS
The seat belts can be cleaned by wiping them
with a sponge dampened in a mild soap solu-
tion. Allow the belts to dry completely in the
shade before using them. For additional in-
formation, see “Seat belt maintenance”
(P. 1-18).
LAI2095
Retainer clips
7-6Appearance and care

When performing any inspection or mainte-
nance work on your vehicle, always take care
to prevent serious accidental injury to your-
self or damage to the vehicle. The following
are general precautions which should be
closely observed.
WARNING
• Park the vehicle on a level surface, apply
the parking brake securely and block the
wheels to prevent the vehicle from mov-
ing. Push the park button to engage the
P (Park) position.
• Be sure the ignition switch is in the OFF
or LOCK position when performing any
parts replacement or repairs.
• If you must work with the engine run-
ning, keep your hands, clothing, hair and
tools away from moving fans, belts and
any other moving parts.
• It is advisable to secure or remove any
loose clothing and remove any jewelry,
such as rings, watches, etc. before work-
ing on your vehicle.
• Always wear eye protection whenever
you work on your vehicle.
• Your vehicle is equipped with an auto-
matic engine cooling fan. It may come on
at any time without warning, even if the ignition switch is in the OFF position and
the engine is not running. To avoid injury,
always disconnect the negative battery
cable before working near the fan.
• If you must run the engine in an enclosed
space such as a garage, be sure there is
proper ventilation for exhaust gases to
escape.
• Never get under the vehicle while it is
supported only by a jack. If it is necessary
to work under the vehicle, support it
with safety stands.
•
Keep smoking materials, flame and sparks
away from the fuel tank and battery.
• Because the fuel lines on gasoline engine
models are under high pressure even
when the engine is off, it is recommended
that you visit an INFINITI retailer for ser-
vice of the fuel filter or fuel lines.
CAUTION
• Do not work under the hood while the
engine is hot. Turn the engine off and
wait until it cools down.
•
Avoid contact with used engine oil and
coolant. Improperly disposed engine oil,
engine coolant and/or other vehicle fluids
can damage the environment. Always con-
form to local regulations for disposal of
vehicle fluid.
• Never leave the engine or Continuously
Variable Transmission (CVT) related
component harnesses disconnected
while the ignition switch is in the ON
position.
• Never connect or disconnect the battery
or any transistorized component while
the ignition switch is in the ON position.
NOTE:
If the battery is completely drained the
transmission will not manually shift to other
positions.
This “Do-it-yourself” section gives instruc-
tions regarding only those items which are
relatively easy for an owner to perform.
A Genuine INFINITI service manual is also
available. For additional information, see
“Owner’s Manual/Service Manual order in-
formation” (P. 10-26).
You should be aware that incomplete or im-
proper servicing may result in operating diffi-
culties or excessive emissions, and could af-
fect warranty coverage. If in doubt about any
servicing, it is recommended that you have it
done by an INFINITI retailer.
MAINTENANCE PRECAUTIONS
8-2Do-it-yourself

CAUTION
Be careful not to burn yourself, as the en-
gine oil is hot.
WARNING
• Prolonged and repeated contact with
used engine oil may cause skin cancer.
• Try to avoid direct skin contact with
used oil. If skin contact is made, wash
thoroughly with soap or hand cleaner as
soon as possible.
• Keep used engine oil out of reach of
children.
4. Loosen the oil filter with an oil filter wrench by turning it counterclockwise.
Remove the oil filter by turning it by hand.
5. Wipe the engine oil filter mounting sur- face with a clean rag.
CAUTION
Be sure to remove any old gasket material
remaining on the sealing surface of the en-
gine. Failure to do so could lead to an oil
leak and engine damage.
• The dipstick must be inserted in place to
prevent oil spillage from the dipstick hole
when filling the engine with oil.
6. Coat the gasket on the new filter with clean engine oil.
7. Screw in the oil filter clockwise until a slight resistance is felt, then tighten addi-
tionally more than 2/3 turn.
Oil filter tightening torque: 14.7 to 20.6 N·m (11 to 15 ft-lb)
8. Clean and re-install the drain plug with a new washer. Securely tighten the drain
plug with a wrench. Do not use excessive
force.
Drain plug tightening torque: 29.4 to 39.2 N·m (22 to 29 ft-lb)
9. Refill the engine with the recommended oil through the oil filler opening, and install
the oil filler cap securely. For additional information about drain and
refill capacity, see “Recommended fluids/
lubricants and capacities” (P. 10-2). The drain
and refill capacity depends on the oil tem-
perature and drain time. Use these specifica-
tions for reference only. Always use the dip-
stick to determine the proper amount of oil in
the engine.
10. Start the engine and check for leakage
around the drain plug and the oil filter.
Correct as required. Turn the engine off
and wait more than 15 minutes. Check
the oil level with the dipstick. Add engine
oil if necessary.
After the operation
1. Reinstall engine protectors in reverse or-der of removal.
2. Lower the vehicle carefully to the ground.
3. Reset the oil control system. For addi- tional information, see “Oil control sys-
tem” (P. 2-25)
• Dispose of waste oil and filter properly.
• Check your local regulations.
Do-it-yourself8-9

• If the battery is labeled "do not open" it ismaintenance free and battery fluid should
not be checked. It is recommended that you
visit an INFINITI retailer or a qualified spe-
cialist workshop to confirm the battery's
performance.
• Keep the battery surface clean and dry. Clean the battery with a solution of baking
soda and water.
• Make certain the terminal connections are clean and securely tightened.
• If the vehicle is not to be used for 30 days or longer, disconnect the negative (-) bat-
tery terminal cable to prevent discharge.
NOTE:
Care should be taken to avoid situations
that can lead to potential battery dis-
charge and potential no-start conditions
such as:
1. Installation or extended use of electronic accessories that consume battery power
when the engine is not running (Phone
chargers, GPS, DVD players, etc.)
2. Vehicle is not driven regularly and/or only driven short distances.
In these cases, the battery may need to be
charged to maintain battery health.
WARNING
• Do not expose the battery to flames, an
electrical spark or a cigarette. Hydrogen
gas generated by the battery is explo-
sive. Explosive gases can cause blindness
or injury. Do not allow battery fluid to
contact your skin, eyes, fabrics or
painted surfaces. Sulfuric acid can cause
blindness or injury. After touching a bat-
tery or battery cap, do not touch or rub
your eyes. Thoroughly wash your hands.
If the acid contacts your eyes, skin or
clothing, immediately flush with water
for at least 15 minutes and seek medical
attention.
• When working on or near a battery, al-
ways wear suitable eye protection and
remove all jewelry.
• Battery posts, terminals and related ac-
cessories contain lead and lead com-
pounds. Wash hands after handling.
• Keep battery out of the reach of children.
• Do not tip the battery.
NOTE:
Do not try to open the top of the battery.
This battery is not equipped with removable
vent caps.
Vehicles operated in high temperatures or
under severe conditions might present bat-
tery liquid loss. It is recommended that you
visit an INFINITI retailer for a proper battery
diagnosis and service in case of required.
LDI3595
Do-it-yourself8-13