Page 545 of 623

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 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.
This “Maintenance and do-it-yourself” section
gives instructions regarding only those items
which are relatively easy for an owner to perform.
A Genuine INFINITI service manual is also avail-
able. For additional information, refer to “Owner’s
Manual/Service Manual order information” in the
“Technical and consumer 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
an INFINITI retailer.
8-6Maintenance and do-it-yourself
Page 558 of 623

1. Super charger pulley
2. Idler pulley
3. Water pump pulley
4 Air conditioner compressor pulley
5. Drive belt automatic tensioner pulley
6. Crankshaft pulley
WARNING
Be sure the ignition key is in the OFF or
LOCK position before servicing drive belt.
The engine could rotate unexpectedly.1. Visually inspect the belt for signs of unusual
wear, cuts, fraying or looseness. If the belt is
in poor condition or is loose, have it replaced
or adjusted. It is recommended that you visit
an INFINITI retailer for this service.
2. Have the belt checked regularly for condi- tion and tension in accordance with the
maintenance schedule found in your
“INFINITI Service and Maintenance Guide”.
REPLACING SPARK PLUGS
Iridium-tipped spark plugs
It is not necessary to replace iridium-tippedA
spark plugs as frequently as conventional type
spark plugs because they last much longer. Fol-
low the maintenance log shown in the “INFINITI
Service and Maintenance Guide”. Do not service
iridium-tipped spark plugs by cleaning or regap-
ping.
● Always replace spark plugs with rec-
ommended or equivalent ones.
LDI2493SDI1895
DRIVE BELT SPARK PLUGS
Maintenance and do-it-yourself8-19
Page 559 of 623

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.
If replacement is required, it is recommended that
you visit an INFINITI retailer for this service.
WARNING
● Operating the engine with the air
cleaner filter off can cause you or others
to be burned. The air cleaner filter not
only cleans the intake air, it also stops
the flame if the engine backfires. If the
air cleaner is not installed and the en-
gine backfires, you could be burned.
Never drive with the air cleaner filter off.
Be cautious working on the engine
when the air cleaner is off. ●
Never pour fuel into the throttle body or
attempt to start the engine with the air
cleaner removed. Doing so could result
in serious injury.
To remove the filter from the air cleaner, push the
tabs
Aand pull the cover upward.
The viscous paper type filter element should not
be cleaned and reused. Replace the air filter
according to the maintenance log shown in the
“INFINITI Service and Maintenance Guide.”
When replacing the air filter, wipe the inside of
the air cleaner housing and the cover with a damp
cloth.
NOTE:
After installing a new air cleaner, make
sure the air cleaner cover is seated in the
housing and latch the clips
A.
IN-CABIN MICROFILTER
The in-cabin microfilter restricts the entry of air-
borne dust and pollen particles and reduces
some objectionable outside odors. The filter is
located behind the glove box. Refer to the
“INFINITI Service and Maintenance Guide” for
change intervals.
If replacement is required, it is recommended that
you visit an INFINITI retailer for this service.
LDI2730
AIR CLEANER
8-20Maintenance and do-it-yourself
Page 562 of 623

Under some driving or climate conditions, occa-
sional brake squeak, squeal or other noise may
be heard. Occasional brake noise during light to
moderate stops is normal and does not affect the
function or performance of the brake system.
Proper brake inspection intervals should
be followed.For additional information regard-
ing brake inspections, refer to the appropriate
maintenance schedule information in the
“INFINITI Service and Maintenance Guide”.
ENGINE COMPARTMENT
WARNING
Never use a fuse of higher or lower amper-
age rating than that specified on the fuse
box cover. This could damage the electri-
cal system or electronic control units or
cause a fire.
If any electrical equipment does not come on,
check for an open fuse. 1. Be sure the ignition switch and the headlight switch are OFF.
2. Open the engine hood. 3. Remove the fuse box cover by pushing the
tab and lifting the cover up.
4. Remove the fuse with the fuse puller. The fuse puller is located in the fuse block in the
passenger compartment.
LDI2267
FUSES
Maintenance and do-it-yourself8-23
Page 563 of 623

5. If the fuse is openA, replace it with a new
fuse
B.
6. If a new fuse also opens, have the electrical system checked and repaired. It is recom-
mended that you visit an INFINITI retailer for
this service.
Fusible links
If the electrical equipment does not operate and
fuses are in good condition, check the fusible
links. If any of these fusible links are melted,
replace with only Genuine NISSAN parts.
PASSENGER COMPARTMENT
WARNING
Never use a fuse of higher or lower amper-
age rating than that specified on the fuse box
cover. This could damage the electrical sys-
tem or electronic control units or cause a fire.
If any electrical equipment does not operate,
check for an open fuse.
1. Be sure the ignition switch and the headlight switch are OFF.
2. Pull the fuse box cover to remove.
3. Remove the fuse with the fuse puller. 4. If the fuse is open
A, replace it with an
equivalent good fuse
B.
5. Push the fuse box cover to install.
6. If a new fuse also opens, have the electrical system checked and repaired. It is recom-
mended that you visit an INFINITI retailer for
this service.
LDI0456LDI2092LDI0456
8-24Maintenance and do-it-yourself
Page 585 of 623

Incorrect ignition timing may result in spark
knock, after-run and/or overheating, which may
cause excessive fuel consumption or engine
damage. If any of the above symptoms are en-
countered, have your vehicle checked. It is rec-
ommended that you visit an INFINITI retailer.
However, now and then you may notice
light spark knock for a short time while
accelerating or driving up hills. This is not a
cause for concern, because you get the
greatest fuel benefit when there is light
spark knock for a short time under heavy
engine load.
ENGINE OIL AND OIL FILTER
RECOMMENDATIONS
Selecting the correct oil
It is essential to choose the correct grade, quality
and viscosity engine oil to ensure satisfactory
engine life and performance. For additional infor-
mation, refer toRecommended fluids/lubricants
and capacities in this section. INFINITI recom-
mends the use of an energy conserving oil in
order to improve fuel economy.
Select only engine oils that meet the American
Petroleum Institute (API) certification or Interna-
tional Lubricant Standardization and Approval Committee (ILSAC) certification and SAE vis-
cosity standard. These oils have the API certifica-
tion mark on the front of the container. Oils which
do not have the specified quality label should not
be used as they could cause engine damage.Oil additives
INFINITI does not recommend the use of oil ad-
ditives. The use of an oil additive is not necessary
when the proper oil type is used and maintenance
intervals are followed.
Oil which may contain foreign matter or has been
previously used should not be used.
LTI2051
9-6Technical and consumer information
Page 587 of 623
ENGINE
ModelQR25DER
Type Gasoline, 4-cycle, DOHC
Cylinder arrangement 4-cylinder in-line
Bore x Stroke in (mm) 3.5 x 3.9 (89.0 x 100.0)
Displacement cu in (cm
3) 151.82 (2,488)
Firing order 1–3–4–2
Idle speed
No adjustment is necessary.
CVT (in “N” position)
Ignition timing (degree B.T.D.C. at idle speed)
CO % at idle
Spark plug
DILKAR7C9H
Spark plug gap (Nominal) in (mm) 0.035 (0.9)
Camshaft operation Timing chain
This spark ignition system complies with the Canadian standard ICES-002.
SPECIFICATIONS
9-8Technical and consumer information
Page 611 of 623

If a powertrain system component is repaired or
the battery is disconnected, the vehicle may be
reset to a “not ready” condition. Before taking the
I/M test, check the vehicle’s
inspection/maintenance test readiness condi-
tion. Place the ignition switch in the ON position
without starting the engine. If the Malfunction
Indicator Light (MIL) comes on steady for 20 sec-
onds and then blinks for 10 seconds , the I/M test
condition is “not ready”. If the MIL does not blink
after 20 seconds, the I/M test condition is
“ready”. It is recommended that you visit an
INFINITI retailer to set the “ready condition” or to
prepare the vehicle for testing.This vehicle is equipped with an Event Data Re-
corder (EDR) . The main purpose of an EDR is to
record, in certain crash or near crash-like situa-
tions, such as an air bag deployment or hitting a
road obstacle, data that will assist in understand-
ing how a vehicle’s systems performed. The EDR
is designed to record data related to vehicle
dynamics and safety systems for a short period of
time, typically 30 seconds or less. The EDR in this
vehicle is designed to record such data as:
● How various systems in your vehicle were
operating;
● Whether or not the driver and passenger
safety belts were buckled/fastened;
● How far (if at all) the driver was depressing
the accelerator and/or brake pedal; and,
● How fast the vehicle was traveling.
● Sounds are not recorded. These data can help provide a better understand-
ing of the circumstances in which crashes and
injuries occur. NOTE: EDR data are recorded by
your vehicle only if a nontrivial crash situation
occurs; no data are recorded by the EDR under
normal driving conditions and no personal data
(e.g. name, gender, age and crash location) are
recorded. However, other parties, such as law
enforcement, could combine the EDR data with
the type of personally identifying data routinely
acquired during a crash investigation.
To read data recorded by an EDR, special equip-
ment is required and access to the vehicle or the
EDR is needed. In addition to the vehicle manu-
facturer and INFINITI retailer, other parties, such
as law enforcement, that have the special equip-
ment, can read the information if they have ac-
cess to the vehicle or the EDR. EDR data will only
be accessed with the consent of the vehicle
owner or lessee or as otherwise required or per-
mitted by law.
EVENT DATA RECORDERS (EDR)
9-32Technical and consumer information