2018 NISSAN SENTRA ECU

2WD models with Continuously
Variable Transmission (CVT)
NISSAN recommends that your vehicle be
towed with the driving (front) wheels off the
ground or place the vehicle on a flatbed
truck as illustrated.
CAUTION
∙ Never tow CVT models with the frontwheels on the ground or four wheels
on the ground (forward or backward),
as this may cause serious and expen-
sive damage to the transmission. If it
is necessary to tow the vehicle with
the rear wheels raised always use
towing dollies under the front wheels.
∙ When towing CVT models with the rear wheels on the ground or on tow-
ing dollies: – Place the ignition switch in the OFF
position, and secure the steering
wheel in a straight-ahead position
with a rope or similar device. Never
secure the steering wheel by plac-
ing the ignition switch in the LOCK
position. This may damage the
steering lock mechanism (for
models with a steering lock
mechanism).
LCE2345
In case of emergency6-13

Floor mat installation
Your vehicle is equipped with floor mat po-
sitioning hook(s). The number and shape of
the floor mat positioning hooks for each
seating position varies depending on the
vehicle.
When installing Genuine NISSAN floor mats,
follow the installation instructions provided
with the mat and the following:1. With the ignition in the OFF position, the shif t lever in P (Park) position (Continu-
ously Variable Transmission models) or
the shif t lever in the N (Neutral) position
(manual transmission models) and
with the parking break fully applied, po-
sition the floor mat in the floorwell so
that the floor mat grommet holes are
aligned with the hook(s).
2. Secure the grommet holes into the hook(s) 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 still in the OFF position, the shif t
lever in the P (Park) position (Continu-
ously Variable Transmission models) or
the shif t lever in the N (Neutral) position
(manual transmission models) and
with the parking break applied, fully ap-
ply and release all pedals. The floor mat
must not interfere with pedal opera-
tion or prevent the pedal from return-
ing to its normal position.
It is recommended that you visit a NISSAN
dealer for details about installing the floor
mats in your vehicle.
The illustration shows the location of the
floor mat positioning hooks.
SEAT BELTS
The seat belts can be cleaned by wiping
them with a sponge dampened in a mild
soap solution. Allow the belts to dry com-
pletely in the shade before using them. For
additional information, refer to “Seat belt
maintenance” in the “Safety—Seats, seat
belts and supplemental restraint system”
section of this manual.
Positioning hooks
LPD2495
Appearance and care7-7

When performing any inspection or main-
tenance work on your vehicle, always take
care to prevent serious accidental injury to
yourself or damage to the vehicle. The fol-
lowing are general precautions which
should be closely observed.
WARNING
∙ Park the vehicle on a level surface, ap-ply the parking brake securely and
block the wheels to prevent the ve-
hicle from moving. For manual trans-
mission models, move the shif t lever
to N (Neutral). For CVT models, move
the shif t lever to P (Park).
∙ Be sure the ignition switch is in the OFF or LOCK position when perform-
ing 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 jew-
elry, such as rings, watches, etc. be-
fore working on your vehicle.
∙ Always wear eye protection whenever you work on your vehicle. ∙ If you must run the engine in an en-
closed 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 neces-
sary to work under the vehicle, sup-
port it with safety stands.
∙ Keep smoking materials, flame and sparks away from the fuel tank and
battery.
∙ Because the fuel lines on gasoline en- gine models are under high pressure
even when the engine is off, it is rec-
ommended that you visit a NISSAN
dealer for service of the fuel filter or
fuel lines.
∙
Your vehicle is equipped with an auto-
matic engine cooling fan. It may come on
at any time without warning, even if the
ignition key is in the OFF position and the
engine is not running. To avoid injury, al-
ways disconnect the negative battery
cable before working near the fan.
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. Al-
ways conform to local regulations for
disposal of vehicle fluid.
∙ Never leave the engine or the trans- mission related component harness
connector disconnected while the ig-
nition switch is in the ON position.
∙ Never connect or disconnect the bat- tery or any transistorized component
while the ignition switch is in the ON
position.
This “Do-it-yourself ” section gives instruc-
tions regarding only those items which are
relatively easy for an owner to perform.
A Genuine NISSAN service manual is also
available. For additional information, refer
to “Owner’s Manual/Service Manual order
information” in the “Technical and con-
sumer information” section of this manual.
You should be aware that incomplete or
improper servicing may result in operating
difficulties or excessive emissions, and
could affect warranty coverage. If in doubt
about any servicing, it is recommended
that you have it done by a NISSAN dealer.
MAINTENANCE PRECAUTIONS
8-2Do-it-yourself

2. Start the engine and let it idle until itreaches operating temperature, then
turn it off.
3. Remove the oil filler cap
Aby turning it
counterclockwise. 4. Place a large drain pan under the drain
plug
B.
5. Remove the drain plug
Bwith a
wrench by turning it counterclockwise
and completely drain the oil.
If the oil filter is to be changed, remove
and replace it at this time. For addi-
tional information, refer to “Changing
engine oil filter” in this section.
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.
CAUTION
∙ Be careful not to burn yourself. Theengine oil may be hot.
∙ Waste oil must be disposed of properly.
∙ Check your local regulations. 6. Clean and reinstall the drain plug and a
new washer. Securely tighten the drain
plug with a wrench. Do not use exces-
sive force.
Drain plug tightening torque: 25 f t-lb (34 N·m)
7. Refill engine with recommended oil through the oil filler opening, then install
the oil filler cap securely.
For additional information on the drain
and refill capacity, refer to “Recom-
mended fluids/lubricants and capaci-
ties” in the “Technical and consumer
information” section of this manual.
The drain and refill capacity depends
on the oil temperature and drain time.
Use these specifications for reference
only. Always use the dipstick to deter-
mine when the proper amount of oil is
in the engine.
8. Start the engine. Check for leakage around the drain plug and oil filter. Cor-
rect as required.
9. Turn the engine off and wait more than 10 minutes. Check the oil level with the
dipstick. Add engine oil if necessary.MR16DDT
LDI3043
Do-it-yourself8-9

4. Loosen the oil filterBwith an oil filter
wrench by turning it counterclockwise.
Then remove the oil filter by turning it
by hand.
CAUTION
Be careful not to burn yourself. The en-
gine oil may be hot.
5. Wipe the engine oil filter sealing surface with a clean rag.
CAUTION
Be sure to remove any old gasket mate-
rial remaining on the sealing surface of
the engine. Failure to do so could lead to
engine damage.
6. Coat the gasket on the new filter with clean engine oil.
7. Screw on the oil filter. Securely tighten oil filter with wrench. Do not use exces-
sive force.
Oil filter tightening torque: 18 N·m (13 f t-lb)
8. Refill engine with recommended oil through the oil filler opening
A, then
install oil filler cap securely. 9. Start the engine and check for leakage
around the oil filter. Correct as required.
10. Turn the engine off and wait more than 10 minutes. Check the oil level. Add en-
gine oil if necessary.
For additional information on the location
of the engine oil filler cap, refer to “Engine
compartment check locations” in this sec-
tion.
CAUTION
∙ NISSAN recommends using Genuine NISSAN CVT Fluid NS-3 (or equivalent)
ONLY in NISSAN CVTs. Do not mix with
other fluids.
∙ Do not use Automatic Transmission Fluid (ATF) or manual transmission
fluid in a NISSAN CVT, as it may dam-
age the CVT. Damage caused by the
use of fluids other than as recom-
mended is not covered under
NISSAN’s New Vehicle Limited
Warranty.
∙ Using fluids that are not equivalent to Genuine NISSAN CVT Fluid NS-3 may
also damage the CVT. Damage caused
by the use of fluids other than as rec-
ommended is not covered under
NISSAN’s New Vehicle Limited
Warranty.
When checking or replacement of CVT fluid
is required, it is recommended that you visit
a NISSAN dealer for servicing.
CONTINUOUSLY VARIABLE
TRANSMISSION (CVT) FLUID (if so
equipped)
Do-it-yourself8-11

∙ Keep the battery surface clean and dry.Clean the battery with a solution of bak-
ing 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 nega-
tive (-) battery 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 elec-
tronic accessories that consume bat-
tery 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. Hy-
drogen gas generated by the battery
is explosive. Explosive gases can
cause blindness or injury. Do not allow
battery fluid to contact your skin,
eyes, fabrics or painted surfaces. Sul-
furic acid can cause blindness or in-
jury. Af ter touching a battery or bat-
tery cap, do not touch or rub your
eyes. Thoroughly wash your hands. If
the acid contacts your eyes, skin or
clothing, immediately flush with wa-
ter for at least 15 minutes and seek
medical attention.
∙ Do not operate the vehicle if the fluid in the battery is low. Low battery fluid
can cause a higher load on the battery
which can generate heat, reduce bat-
tery life, and in some cases lead to an
explosion.
∙ When working on or near a battery, always wear suitable eye protection
and remove all jewelry. ∙ Battery posts, terminals and related
accessories contain lead and lead
compounds. Wash hands af ter
handling.
∙ Keep battery out of the reach of children.
∙ Do not tip the battery. Keep the vent caps tight and the battery level.
BATTERY
8-14Do-it-yourself

1. Visually inspect the belt for signs of un-usual wear, cuts, or fraying. If the belt is
in poor condition, have it replaced or
adjusted. It is recommended that you
visit a NISSAN dealer for this service.
2. Have the belt checked regularly for condition.
REPLACING SPARK PLUGS
WARNING
Be sure the engine and ignition switch
are off and that the parking brake is
engaged securely.
CAUTION
Be sure to use the correct socket to re-
move the spark plugs. An incorrect
socket can damage the spark plugs.
Platinum-tipped spark plugs
(except California models)
It is not necessary to replace platinum-
tipped
Aspark plugs as frequently as con-
ventional type spark plugs because they
last much longer. Follow the maintenance
log shown in the “Maintenance and sched-
ules” section of this manual. Do not service
platinum-tipped spark plugs by cleaning or
regapping.
∙ Always replace spark plugs with rec-
ommended or equivalent ones.
If replacement is required, it is recom-
mended that you visit a NISSAN dealer for
this service.
Iridium-tipped spark plugs
(MR16DDT engine or California
models only)
It is not necessary to replace iridium-
tipped
Aspark plugs as frequently as con-
ventional type spark plugs because they
last much longer. Follow the maintenance
log shown in the “Maintenance and sched-
ules” section in the manual. Do not service
iridium-tipped spark plugs by cleaning or
regapping.
SDI1895
SPARK PLUGS
Do-it-yourself8-17

Two types of fuses are used. TypeAis
used in the fuse boxes in the engine com-
partment. Type
Bis used in the passenger
compartment fuse box.
Type
Afuses can be installed in the engine
compartment and passenger compart-
ment fuse boxes. If a type
Afuse is used to replace a typeB
fuse, the typeAfuse will not be level with
the fuse pocket as shown in the illustration.
This will not affect the performance of the
fuse. Make sure the fuse is installed in the
fuse box securely.
Type
Bfuses cannot be installed in the
under hood fuse boxes. Only use type
A
fuses in the under hood fuse boxes.
NOTE:
Your vehicle may not be equipped with
all fuses listed on the fuse label.
ENGINE COMPARTMENT
WARNING
Never use a fuse of higher or lower am-
perage rating than that specified on the
fuse box cover. This could damage the
electrical system or electronic control
units or cause a fire.
LDI0455LDI0457LDI2172
FUSES
8-22Do-it-yourself