2006 NISSAN SENTRA ignition

When performing any inspection or maintenance
work on your vehicle, always take care to prevent
serious accidental injury to yourself or damage to
the vehicle. The following are general precau-
tions which should be closely observed.
WARNING
cPark the vehicle on a level surface, ap-
ply the parking brake securely and
block the wheels to prevent the vehicle
from moving. For manual transmission
models, move the shift lever to N (Neu-
tral) . For automatic transmission mod-
els, move the selector lever to P (Park) .
cBe sure the ignition key is in the OFF or
LOCK position when performing any
parts replacement or repairs.
cNever leave the engine or automatic
transmission related component har-
nesses disconnected while the ignition
switch is in the ON position.
cNever connect or disconnect the battery
or any transistorized component while
the ignition switch is in the ON position.c
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,
always disconnect the negative battery
cable before working near the fan.
cIf 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.
cIt is advisable to secure or remove any
loose clothing and remove any jewelry,
such as rings, watches, etc. before
working on your vehicle.
cAlways wear eye protection whenever
you work on your vehicle.
cIf 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.
cNever get under the vehicle while it is
supported only by a jack. If it is neces-
sary to work under the vehicle, support
it with safety stands.
cKeep smoking materials, flame and
sparks away from the fuel tank and
battery.cOn gasoline engine models with the
multiport fuel injection (MFI) system,
the fuel filter or fuel lines should be
serviced by a NISSAN dealer because
the fuel lines are under high pressure
even when the engine is off.CAUTION
cDo not work under the hood while the
engine is hot. Turn the engine off and
wait until it cools down.
cAvoid 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.
This “Maintenance and do-it-yourself” section
gives instructions regarding only those items
which are relatively easy for an owner to perform.
A genuine NISSAN service manual is also avail-
able. See “Owner’s Manual/Service Manual or-
der 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,
have it done by a NISSAN dealer.
MAINTENANCE PRECAUTIONS
Maintenance and do-it-yourself8-5
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QG18DE engine
1. Engine oil filler cap
2. Spark plug caps/ignition coils
3. Brake fluid reservoir
4. Clutch fluid reservoir (M/T model)
5. Air cleaner
6. Battery
7. Fuse/Fusible link box
8. Radiator cap
9. Engine oil dipstick
10. Drive belt location
11. Power steering fluid reservoir
12. Engine coolant reservoir
13. Windshield washer fluid reservoir
WDI0509
ENGINE COMPARTMENT CHECK
LOCATIONS
8-6Maintenance and do-it-yourself
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1. Power steering oil pump
2. Water pump
3. Idler
4. Generator
5. A/C compressor
6. Crankshaft
: Tension checking points
WARNING
Be sure the ignition key is in the OFF or
LOCK position. The engine could rotate
unexpectedly.1. Visually inspect the belt(s) for signs of un-
usual wear, cuts, fraying or looseness. If the
belt is in poor condition or is loose, have it
replaced or adjusted by a NISSAN dealer.
2. Have the belts checked regularly for condi-
tion and tension in accordance with the
maintenance schedule found in the
“NISSAN Service and Maintenance Guide”.
1. Power steering fluid pump
2. Water pump
3. Generator
4. A/C compressor (if so equipped)
5. Crankshaft
6. Auto tensioner
QG18DE engine
WDI0191
QR25DE engine
WDI0225
DRIVE BELTS
Maintenance and do-it-yourself8-21
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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
It is not necessary to replace platinum-tipped
spark plugs as frequently as conventional type
spark plugs because they last much longer. Fol-
low the maintenance log shown in the “NISSAN
Service and Maintenance Guide”. Do not service
platinum-tipped spark plugs by cleaning or re-
gapping.
cAlways replace spark plugs with rec-
ommended or equivalent ones.
1. Remove the engine cover (QR25DE en-
gine) .2. Disconnect the ignition coil connectors. Re-
move the ignition coil bolts.
3. Disconnect the ignition coils from the spark
plugs.
4. Remove the spark plugs with a spark plug
socket.
The plug socket has a rubber seal that holds
the spark plug so it does not fall when it is
pulled out. Make sure each spark plug is
snugly fitted into the spark plug socket.
5. Fit the new plugs, one at a time, into the
spark plug socket and install them.Use
only the specified spark plugs.Turn
each plug several full turns by hand, then
tighten with the spark plug socket to the
correct torque. Do not overtighten.
Spark plug tightening torque:
14 - 22 ft-lb (20 - 29 N·m)
6. Holding the boot, reconnect each high ten-
sion cable/ignition coil to its proper spark
plug by pushing it on until you feel a snap.
7. Install the ignition coil bolts.
Ignition coil bolt tightening torque:
33 - 44 in-lb (3.8 - 5.0 N·m)
Connect the ignition coil connector.
8. Install the engine cover (QR25DE engine) .
WDI0005
SPARK PLUGS
8-22Maintenance and do-it-yourself
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ENGINE COMPARTMENT
CAUTION
Never use a fuse of a higher or lower
amperage rating than specified on the
fuse box cover. This could damage the
electrical system 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 center of the fuse
block in the passenger compartment.
5. If the fuse is open
sA, replace it with a new
fuse
sB.
6. If a new fuse also opens, have the electrical
system checked and repaired by a NISSAN
dealer.
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.
WDI0199WDI0452
FUSES
Maintenance and do-it-yourself8-29
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PASSENGER COMPARTMENT
CAUTION
Never use a fuse of a higher or lower
amperage rating than specified on the
fuse box cover. This could damage the
electrical system 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. Remove the coin box
sA.3. Remove the fuse with the fuse puller
sB. The
fuse puller is located in the center of the fuse
block.
4. If the fuse is open, replace it with a known
good fuse.
5. If a new fuse also opens, have the electrical
system checked and repaired by a NISSAN
dealer.
6. Install the coin box.
WDI0201
8-30Maintenance and do-it-yourself
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Owners ManualÐUSA_English(nna)
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If any driveability problems such as engine stall-
ing and difficult hot-starting are experienced after
using oxygenate-blend fuels, immediately
change to a non-oxygenate fuel or a fuel with a
low blend of MTBE.
Take care not to spill gasoline during refu-
eling. Gasoline containing oxygenates can
cause paint damage.
E–85 fuel
E-85 fuel is a mixture of approximately 85% fuel
ethanol and 15% unleaded gasoline. E-85 can
only be used in a Flexible Fuel Vehicle (FFV) . Do
not use E-85 in your vehicle. U.S. government
regulations require fuel ethanol dispensing
pumps to be identified by a small, square, orange
and black label with the common abbreviation or
the appropriate percentage for that region.
Aftermarket fuel additives
NISSAN does not recommend the use of any
aftermarket fuel additives (for example, fuel injec-
tor cleaner, octane booster, intake valve deposit
removers, etc.) which are sold commercially.
Many of these additives intended for gum, varnish
or deposit removal may contain active solvents or
similar ingredients that can be harmful to the fuel
system and engine.
Octane rating tips
Using unleaded gasoline with an octane
rating lower than recommended can cause
persistent, heavy “spark knock.” (“Spark
knock” is a metallic rapping noise.) If se-
vere, this can lead to engine damage. If you
detect a persistent heavy spark knock even
when using gasoline of the stated octane
rating, or if you hear steady spark knock
while holding a steady speed on level
roads, have a NISSAN dealer correct the
condition. Failure to correct the condition
is misuse of the vehicle, for which NISSAN
is not responsible.
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 at a
NISSAN dealer.
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.
CAUTION
cYour vehicle is not designed to run on
E-85 fuel. Using E-85 fuel in a vehicle
not specifically designed for E-85 fuel
can damage fuel system components
and is not covered by the NISSAN new
vehicle limited warranty.
cE-85 is a mixture of approximately 85%
fuel ethanol and 15% unleaded
gasoline.
cU.S. government regulations require
ethanol dispensing pumps to be identi-
fied by a small, square, orange and
black label with the common abbrevia-
tion or the appropriate percentage for
that region.
9-4Technical and consumer information
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ENGINE
ModelQG18DE QR25DE
TypeGasoline, 4-cycle, DOHC Gasoline, 4-cycle, DOHC
Cylinder arrangement4-cylinder in-line 4-cylinder in-line
Bore x Stroke in (mm) 3.150 x 3.465 (80. x 88.0) 3.504 x 3.937 (89.0 x 100.0)
Displacement cu in (cm
3) 107.94 (1769) 151.8 (2488)
Firing order1–3–4–2 1–3–4–2
Idle speed rpm
Ignition timing degree (B.T.D.C.) at idle speed
degree/rpm See the “Emission Control Information label” on the underside of the
hood.
CO percentage at idle speed
[No air]%
Platinum-tipped type Platinum-tipped type
Spark plug Hot PLFR4A-11 *1 PLFR4A-11 *1
Standard PLFR5A-11 *1 PLFR5A-11 *1
Cold PLFR6A-11 *1 PLFR6A-11 *1
Camshaft operationTiming chain Timing chain
Spark plug gap (Nominal) in (mm) 0.043 (1.1) 0.043 (1.1)
Generator belt size0.843 x 32.28 (21.4 x 820)
Width x Length in (mm) 0.843 x 43.7 (21.4 x 1110) *2 0.843 x 88.46 (21.4 x 2247)
*1: Always check with the Parts Department at a NISSAN dealer for the latest parts information.
*2: With air conditioner
The spark ignition system of this vehicle meets all requirements of the Canadian Interference-Causing Equipment Regulations.
SPECIFICATIONS
Technical and consumer information9-7
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