Page 14 of 336
QR25DE engine
1. Windshield washer fluid reservoir
(P. 8-15)
2. Fuse/fusible link box (P. 8-24)
3. Air cleaner (P. 8-19)
4. Engine oil filler cap (P. 8-9)
5. Engine oil dipstick (P. 8-9)
6. Brake fluid reservoir/Clutch fluid
reservoir (M/T model) (P. 8-14)
7. Drive belt location (P.8-18)
8. Radiator cap (P. 8-8)
9. Power steering fluid reservoir (P. 8-13)
10. Battery (P. 8-15)
11. Engine coolant reservoir (P. 8-8)
See the page number indicated in paren-
theses for operating details.
WDI0506
ENGINE COMPARTMENT CHECK
LOCATIONS
0-8Illustrated table of contents
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Page 15 of 336
VQ40DE engine
1. Windshield washer fluid reservoir
(P. 8-15)
2. Battery (P. 8-15)
3. Fuse/fusible link box (P. 8-24)
4. Engine oil filler cap (P. 8-9)
5. Engine oil dipstick (P. 8-9)
6. Brake fluid reservoir (P. 8-14)
7. Air cleaner (P. 8-19)
8. Drive belt location (P.8-18)
9. Radiator cap (P. 8-8)
10. Power steering fluid reservoir (P. 8-13)
11. Engine coolant reservoir (P. 8-8)
See the page number indicated in paren-
theses for operating details.
WDI0507
Illustrated table of contents0-9
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Page 92 of 336

ENGINE OIL PRESSURE GAUGE (if
so equipped)
The gauge indicates the engine lubrication sys-
tem oil pressure while the engine is running.
When the engine speed is high, the engine oil
pressure is also high. When the engine speed is
low, the gauge may indicate low oil pressure.
CAUTION
cThis gauge is not designed to indicate
low engine oil level. Use the dipstick to
check the oil level. (See “Engine oil” in
the “Maintenance and do-it-yourself”
section.)cIf the gauge needle does not move with
the proper amount of engine oil, have
the vehicle checked by a NISSAN
dealer. Continued vehicle operation in
such a condition could cause serious
damage to the engine.
VOLTMETER (if so equipped)
When the ignition key is turned to the ON posi-
tion, the voltmeter indicates the battery voltage.
When the engine is running, it indicates the gen-
erator voltage.
While cranking the engine, the volts drop below
the normal range. If the needle is not in the normal
range (11 - 15 volts)
s1while the engine is
running, it may indicate that the charging system
is not functioning properly. Have the system
checked by a NISSAN dealer.
LIC0741WIC0913
2-8Instruments and controls
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Page 98 of 336

Low brake fluid warning light
When the ignition key is in the ON position, the
light warns of a low brake fluid level. If the light
comes on while the engine is running with the
parking brake not applied, stop the vehicle and
perform the following:
1. Check the brake fluid level. Add brake fluid
as necessary. See “Brake fluid” in the “Main-
tenance and do-it-yourself” section of this
manual.
2. If the brake fluid level is correct, have the
warning system checked by a NISSAN
dealer.
WARNING
cYour brake system may not be working
properly if the warning light is on. Driv-
ing could be dangerous. If you judge it
to be safe, drive carefully to the nearest
service station for repairs. Otherwise,
have your vehicle towed because driv-
ing it could be dangerous.
cPressing the brake pedal with the en-
gine stopped and/or a low brake fluid
level may increase your stopping dis-
tance and braking will require greater
pedal effort as well as pedal travel.cIf the brake fluid level is below the
MINIMUM or MIN mark on the brake
fluid reservoir, do not drive until the
brake system has been checked at a
NISSAN dealer.
Charge warning light (if so
equipped)
If this light comes on while the engine is running,
it may indicate the charging system is not func-
tioning properly. Turn the engine off and check
the generator belt. If the belt is loose, broken,
missing, or if the light remains on, see a NISSAN
dealer immediately.
CAUTION
cDo not ground electrical accessories
directly to the battery terminal. Doing
so will bypass the variable control sys-
tem and the vehicle battery may not
charge completely. Refer to “Variable
voltage control system” in the “Mainte-
nance and do-it-yourself” section later
in this manual.
cDo not continue driving if the generator
belt is loose, broken or missing.
Door open warning light
This light comes on when any of the doors are not
closed securely while the ignition key is in the ON
position.
Engine oil pressure warning
light (if so equipped)
This light warns of low engine oil pressure. If the
light flickers or comes on during normal driving,
pull off the road in a safe area, stop the engine
immediatelyand call a NISSAN dealer or other
authorized repair shop.
The engine oil pressure warning light is not
designed to indicate a low oil level.Use the
dipstick to check the oil level. See “Engine oil” in
the “Maintenance and do-it-yourself” section of
this manual.
CAUTION
Running the engine with the engine oil
pressure warning light on could cause se-
rious damage to the engine almost imme-
diately. Such damage is not covered by
warranty. Turn off the engine as soon as it
is safe to do so.
2-14Instruments and controls
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Page 246 of 336
QR25DE engine
1. Windshield washer fluid reservoir
2. Fuse/Fusible link box
3. Air cleaner
4. Engine oil filler cap
5. Engine oil dipstick
6. Brake fluid reservoir/Clutch fluid reser-
voir (M/T model)
7. Drive belt location
8. Radiator cap
9. Power steering fluid reservoir
10. Battery
11. Engine coolant reservoir
NOTE:
Engine cover removed for clarity.
WDI0506
ENGINE COMPARTMENT CHECK
LOCATIONS
8-6Maintenance and do-it-yourself
ZREVIEW COPYÐ2006 Truck/Frontier(d22)
Owners ManualÐUSA_English(nna)
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Page 247 of 336
VQ40DE engine
1. Windshield washer fluid reservoir
2. Battery
3. Fuse/fusible link box
4. Engine oil filler cap
5. Engine oil dipstick
6. Brake fluid reservoir
7. Air cleaner
8. Drive belt location
9. Radiator cap
10. Power steering fluid reservoir
11. Engine coolant reservoir
NOTE:
Engine cover removed for clarity.
WDI0507
Maintenance and do-it-yourself8-7
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Page 249 of 336

If the cooling system frequently requires
coolant, have it checked by a NISSAN
dealer.
CHANGING ENGINE COOLANT
A NISSAN dealer can change the engine coolant.
The service procedure can be found in the
NISSAN Service Manual.
Improper servicing can result in reduced
heater performance and engine overheat-
ing.
WARNING
cTo avoid the danger of being scalded,
never change the coolant when the en-
gine is hot.
cNever remove the radiator or engine
coolant reservoir cap when the engine
is hot. Serious burns could be caused
by high pressure fluid escaping from
the radiator.
cAvoid direct skin contact with used
coolant. If skin contact is made, wash
thoroughly with soap or hand cleaner
as soon as possible.
cKeep coolant out of the reach of chil-
dren and pets.
Engine coolant must be disposed of properly.
Check your local regulations.
CHECKING ENGINE OIL LEVEL
1. Park the vehicle on a level surface and apply
the parking brake.
2. Start the engine and let it idle until it reaches
operating temperature.
3. Turn off the engine.Wait more than 10
minutes for the oil to drain back into
the oil pan.
4. Remove the dipstick and wipe it clean. Re-
insert it all the way.
Type B
LDI0466
Type A
LDI0437
ENGINE OIL
Maintenance and do-it-yourself8-9
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Page 250 of 336

5. Remove the dipstick again and check the oil
level. It should be between the H (High) and
L (Low) marks
sB. This is the normal oper-
ating oil level range. If the oil level is below
the L (Low) mark
sA, remove the oil filler cap
and pour recommended oil through the
opening.Do not overfill
sC.
6. Recheck oil level with the dipstick.
It is normal to add some oil between oil
maintenance intervals or during the
break-in period, depending on the severity
of operating conditions.
CAUTION
Oil level should be checked regularly. Op-
erating the engine with an insufficient
amount of oil can damage the engine, and
such damage is not covered by warranty.CHANGING ENGINE OIL
1. Park the vehicle on a level surface and apply
the parking brake.
2. Start the engine and let it idle until it reaches
operating temperature, then turn it off.
3. Remove the oil filler cap
sAby turning it
counterclockwise.
4. Place a large drain pan under the drain plug.
5. Remove the drain plug
sBwith a wrench by
turning it counterclockwise and completely
drain the oil.
Type B
LDI0467LDI0371
VQ40DE
WDI0500
8-10Maintenance and do-it-yourself
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