INFINITI QX4 2001 Factory Service Manual

steps 4 through 8 until coolant level no longer drops.
IClean excess coolant from engine.
ÐFLUSHING COOLING SYSTEMÐNBMA0011S031. Open air relief plug.
2. Fill radiator with water until water spills from the air relief holes,
then close air relief plugs. Fill radiator and reservoir tank with
water and reinstall radiator cap.
3. Run engine and warm it up to normal operating temperature.
4. Rev engine two or three times under no-load.
5. Stop engine and wait until it cools down.
6. Drain water.
7. Repeat steps 1 through 6 until clear water begins to drain from
radiator.
SMA803A
Checking Fuel LinesNBMA0012Inspect fuel lines and tank for improper attachment, leaks, cracks,
damage, loose connections, chafing or deterioration.
If necessary, repair or replace faulty parts.
MMA104A
CAUTION:
Tighten high-pressure rubber hose clamp so that clamp end is
3 mm (0.12 in) from hose end.
Tightening torque specifications are the same for all rubber
hose clamps.
Ensure that screw does not contact adjacent parts.
SEF214Y
Changing Fuel FilterNBMA0013WARNING:
Before removing fuel filter, release fuel pressure from fuel line.
WITH CONSULT-IINBMA0013S011. Turn ignition switch ªONº.
2. Perform ªFUEL PRESSURE RELEASEº in ªWORK SUP-
PORTº mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank engine two or three times to release
all fuel pressure.
ENGINE MAINTENANCE
Changing Engine Coolant (Cont'd)
MA-16

5. Turn ignition switch ªOFFº.
SMA861C
6. Loosen fuel hose clamps.
7. Replace fuel filter.
IBe careful not to spill fuel over engine compartment. Place
a shop towel to absorb fuel.
IUse a high-pressure type fuel filter. Do not use a synthetic
resinous fuel filter.
IWhen tightening fuel hose clamps, refer to ªChecking Fuel
Linesº.
SMA869C
WITHOUT CONSULT-IINBMA0013S021. Remove fuel pump fuse located in fuse box.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel
pressure.
4. Turn ignition switch ªOFFº and install fuel pump fuse.
SMA861C
5. Loosen fuel hose clamps.
6. Replace fuel filter.
IBe careful not to spill fuel over engine compartment. Place
a shop towel to absorb fuel.
IUse a high-pressure type fuel filter. Do not use a synthetic
resinous fuel filter.
IWhen tightening fuel hose clamps, refer to ªChecking Fuel
Linesº.
SMA095D
Changing Air Cleaner FilterNBMA0014VISCOUS PAPER TYPENBMA0014S01The viscous paper type filter does not need cleaning between
replacement intervals.
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ENGINE MAINTENANCE
Changing Fuel Filter (Cont'd)
MA-17

SMA096D
Changing Engine OilNBMA0015WARNING:
IBe careful not to burn yourself, as the engine oil is hot.
IProlonged 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.
1. Warm up engine, and check for oil leakage from engine com-
ponents.
2. Stop engine and wait for more than 10 minutes.
3. Remove drain plug and oil filler cap.
4. Drain oil and refill with new engine oil.
Oil specification and viscosity
IAPI grade SG or SH, Energy ConservingI&IIorAPIgrade
SJ, Energy Conserving
IAPI Certification Mark
IILSAC grade GF-I & GF-II
ISee ªRECOMMENDED FLUIDS AND LUBRICANTSº, MA-11.
Oil capacity (Approximately):
Unit:(US qt, Imp qt)
Drain and refillWith oil filter change 5.0 (5-1/4, 4-3/8)
Without oil filter change 4.8 (5-1/8, 4-1/4)
Dry engine (engine overhaul) 6.8 (7-1/4, 6)
CAUTION:
IBe sure to clean drain plug and install with new washer.
Oil pan drain plug:
: 29 - 39 N´m (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
IThe refill capacity depends on the oil temperature and
drain time. Use these specifications for reference only.
Always use the dipstick to determine when the proper
amount of oil is in the engine.
JMA122D
5. Warm up engine and check area around drain plug and oil fil-
ter for oil leakage.
6. Stop engine and wait for more than 10 minutes.
7. Check oil level.
SMA097D
Changing Oil FilterNBMA00161. Remove oil filter with Tool.
WARNING:
Be careful not to burn yourself, as the engine and engine oil
are hot.
The filter is a full-flow cartridge type and is provided with a relief
valve.
Refer to LC-7, ªOil Filterº.
ENGINE MAINTENANCE
Changing Engine Oil
MA-18

SMA010
2. Clean oil filter mounting surface on cylinder block. Coat rubber
seal of new oil filter with engine oil.
SMA702C
3. Screw in the oil filter until a slight resistance is felt, then tighten
an additional 2/3 turn.
4. Add engine oil.
Refer to MA-18, ªChanging Engine Oilº.
IClean excess oil from engine.
SMA098D
Changing Spark PlugsNBMA00171. Remove engine cover.
2. Remove throttle wires.
3. Remove air duct with air cleaner assembly.
4. Disconnect harness connectors and harness brackets around
ignition coil sides.
5. Remove throttle body. (Only when removing the No. 4 cylinder
spark plug)
6. Disconnect ignition coil harness connectors.
7. Loosen ignition coil fixing bolts and pull out coil from intake
manifold connector.
Ignition coil:
: 8.5 - 10.7 N´m (0.86 - 1.1 kg-m, 75 - 95 in-lb)
SEM294A
8. Check type and gap of new spark plug.
Spark plug type:
Symbol Make
Standard type PLFR5A-11 NGK
Cold type PLFR6A-11 NGK
Hot type PLFR4A-11 NGK
Gap (Nominal): 1.1 mm (0.043 in)
Spark plug:
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ENGINE MAINTENANCE
Changing Oil Filter (Cont'd)
MA-19

: 20 - 29 N´m (2.0 - 3.0 kg-m, 14 - 22 ft-lb)
Use standard type spark plug for normal condition.
The hot type spark plug is suitable when fouling may occur with the
standard type spark plug such as:
Ifrequent engine starts
Ilow ambient temperatures
The cold type spark plug is suitable when spark knock may occur
with the standard type spark plug such as:
Iextended highway driving
Ifrequent high engine revolution
SMA773C
IDo not use a wire brush for cleaning.
IIf plug tip is covered with carbon, spark plug cleaner may
be used.
Cleaner air pressure:
Less than 588 kPa (6 kg/cm
2, 85 psi)
Cleaning time:
Less than 20 seconds
SMA806C
IChecking and adjusting plug gap is not required between
change intervals.
SMA099D
Checking EVAP Vapor LinesNBMA00181. Visually inspect EVAP vapor lines for improper attachment,
cracks, damage, loose connections, chafing or deterioration.
2. Inspect vacuum relief valve of fuel tank filler cap for clogging,
sticking, etc.
Refer to EC-32, ªEVAPORATIVE EMISSION SYSTEMº.
ENGINE MAINTENANCE
Changing Spark Plugs (Cont'd)
MA-20

SMA211A
Checking Exhaust SystemNBMA0019Check exhaust pipes, muffler and mounting for improper
attachment, leaks, cracks, damage, loose connections, chafing or
deterioration.
SMA121D
Checking A/T FluidNBMA00201. Warm up engine.
2. Check for fluid leakage.
3. Before driving, fluid level can be checked at fluid temperatures
of 30 to 50ÉC (86 to 122ÉF) using ªCOLDº range on dipstick.
a. Park vehicle on level surface and set parking brake.
b. Start engine and move selector lever through each gear posi-
tion. Leave selector lever in ªPº position.
c. Check fluid level with engine idling.
d. Remove dipstick and note reading. If level is at low side of
either range, and fluid to the charging pipe.
e. Re-insert dipstick into charging pipe as far as it will go.
f. Remove dipstick and note reading. If reading is at low side of
range, add fluid to the charging pipe.
Do not overfill.
4. Drive vehicle for approximately 5 minutes in urban areas.
5. Re-check fluid level at fluid temperatures of 50 to 80ÉC (122
to 176ÉF) using ªHOTº range on dipstick.
SMA853B
6. Check fluid condition.
IIf fluid is very dark or smells burned, refer to AT section for
checking operation of A/T. Flush cooling system after repair of
A/T.
IIf A/T fluid contains frictional material (clutches, bands, etc.),
replace radiator and flush cooler line using cleaning solvent
and compressed air after repair of A/T. Refer to LC-19, ªRadia-
torº.
SMA515C
Changing A/T FluidNBMA00211. Warm up A/T fluid.
2. Stop engine.
3. Drain A/T fluid from drain plug and refill with new A/T fluid.
Always refill same volume with drained fluid.
Fluid grade:
Nissan Matic ªDº (Continental U.S. and Alaska) or
Canada NISSAN Automatic Transmission Fluid.
Refer to ªRECOMMENDED FLUIDS AND
LUBRICANTSº, MA-11.
Fluid capacity (With torque converter):
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CHASSIS AND BODY MAINTENANCE
Checking Exhaust System
MA-21

2WD, 4WD model
8.5(9 US qt, 7-1/2 Imp qt)
Drain plug:
: 29 - 39 N´m (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
4. Run engine at idle speed for five minutes.
5. Check fluid level and condition. Refer to MA-21, ªChecking A/T
Fluidº. If fluid is still dirty, repeat steps 2 through 5.
SMA439B
Checking All-mode 4WD Transfer FluidNBMA0022Check for oil leakage and fluid level.
A/T fluid is used for the all-mode 4WD transfer in the factory.
Never start engine while checking fluid level.
Filler plug:
: 10 - 20 N´m (1.0 - 2.0 kg-m, 87 - 174 in-lb)
SMA444B
Changing All-mode 4WD Transfer FluidNBMA0023When changing all-mode 4WD transfer fluid completely, A/T fluid
may be used.
Fluid grade:
Nissan Matic ªDº (Continental U.S. and Alaska) or
Canada NISSAN Automatic Transmission Fluid.
Refer to ªFluids and Lubricantsº, ªRECOMMENDED
FLUIDS AND LUBRICANTSº, MA-11.
Fluid capacity:
3.0(3-1/8 US qt, 2-5/8 Imp qt)
Drain plug:
: 10 - 20 N´m (1.0 - 2.0 kg-m, 87 - 174 in-lb)
CHASSIS AND BODY MAINTENANCE
Changing A/T Fluid (Cont'd)
MA-22

SMA231
SMA872C
Checking Propeller ShaftNBMA0024Check propeller shaft for damage, looseness or grease leakage.
Tightening torque: Refer to PD-4, ªComponentsº.
SMA873C
Greasing Propeller ShaftNBMA0025Apply specified grease to nipples provided on propeller shaft.
Grease grade:
Refer to ªRECOMMENDED FLUIDS AND
LUBRICANTSº, MA-11.
SMA440B
Checking Differential Gear OilNBMA0026Check for oil leakage and oil level.
Filler plug:
Front
: 39 - 59 N´m (4 - 6 kg-m, 29 - 43 ft-lb)
Rear
: 59 - 118 N´m (6 - 12 kg-m, 43 - 87 ft-lb)
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CHASSIS AND BODY MAINTENANCE
Checking Propeller Shaft
MA-23

SMA632C
SMA631C
Changing Differential Gear OilNBMA00271. Drain oil from drain plug and refill with new gear oil.
2. Check oil level.
Oil grade and viscosity:
See ªRECOMMENDED FLUIDS AND LUBRICATNSº,
MA-11, 12.
Oil capacity:
Front
1.85(3-7/8 US pt, 3-1/4 Imp pt)
Rear
2.8(5-7/8 US pt, 4-7/8 Imp pt)
Filler plug:
Front
: 39 - 59 N´m (4 - 6 kg-m, 29 - 43 ft-lb)
Rear
: 59 - 118 N´m (6 - 12 kg-m, 43 - 87 ft-lb)
Drain plug:
Front
: 59 - 98 N´m (6 - 10 kg-m, 43 - 72 ft-lb)
Rear
: 59 - 118 N´m (6 - 12 kg-m, 43 - 87 ft-lb)
LIMITED-SLIP DIFFERENTIAL GEARNBMA0027S01IUse only approved limited-slip differential gear oil.
ILimited-slip differential identification.
1. Lift both rear wheels off the ground.
2. Turn one rear wheel by hand.
3. If both rear wheels turn in the same direction simultaneously,
vehicle is equipped with limited-slip differential.
Balancing WheelsNBMA0028Adjust wheel balance using the road wheel center.
Wheel balance (Maximum allowable unbalance):
Refer to SDS, MA-29.
SGI991
Tire RotationNBMA0029IAfter rotating the tires, adjust the tire pressure.
IRetighten the wheel nuts after the vehicle has been driven
for 1,000 km (600 miles). (also in cases of a flat tire, etc.)
Wheel nuts:
: 118 - 147 N´m (12 - 15 kg-m, 87 - 108 ft-lb)
CHASSIS AND BODY MAINTENANCE
Changing Differential Gear Oil
MA-24

SBR451D
Checking Brake Fluid Level and LeaksNBMA0030If fluid level is extremely low, check brake system for leaks.
SBR389C
Checking Brake Lines and CablesNBMA0031Check brake fluid lines and parking brake cables for improper
attachment, leaks, chafing, abrasions and deterioration.
SMA260A
Checking Disc BrakeNBMA0032ROTORNBMA0032S01Check condition and thickness.
Standard thickness:
28 mm (1.10 in)
Minimum thickness:
26 mm (1.02 in)
SMA922A
CALIPERNBMA0032S02Check for leakage.
SMA847B
PADNBMA0032S03Check wear or damage.
Standard thickness:
11 mm (0.43 in)
Minimum thickness:
2 mm (0.08 in)
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CHASSIS AND BODY MAINTENANCE
Checking Brake Fluid Level and Leaks
MA-25