Ins INFINITI QX56 2004 Factory Service Manual

PS-2
PRECAUTIONS
Revision: August 20072004 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EGS000MI
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WAR NIN G:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Steering SystemEGS000MJ

Before disassembly, thoroughly clean the outside of the unit.

Disassembly should be done in a clean work area. It is important to prevent the internal parts from becom-
ing contaminated by dirt or other foreign matter.

For easier and proper assembly, place disassembled parts in order on a parts rack.

Use nylon cloth or paper towels to clean the parts; common shop rags can leave lint that might interfere
with their operation.

Before inspection or reassembly, carefully clean all parts with a general purpose, non-flammable solvent.

Before assembly, apply a coat of recommended Genuine NISSAN PSF or equivalent to hydraulic parts.
Petroleum jelly may be applied to O-rings and seals. Do not use any grease.

Replace all gaskets, seals and O-rings. Avoid damaging O-rings, seals and gaskets during installation.
Perform functional tests whenever designated.

PREPARATION
PS-3
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Revision: August 20072004 QX56
PREPARATIONPFP:00002
Special Service Tools (SST)EGS000MK
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
ST3127 S000
(See J-25765-A)
Preload gauge
1. GG9103000
(J25765-A)
Torque wrench
2. HT62940000
( — )
Socket adapter
3. HT62900000
( — )
Socket adapterInspecting of pinion rotating torque and rota-
tional torque for ball joint
HT72520000
(J-25730-A)
Ball joint removerRemoving steering outer socket
—
(J-46213)
Rear cover wrenchRemoving rear cover
a: 21.6 mm (0.850 in)
b: 34.9 mm (1.374 in)
KV48104400
( — )
Teflon ring correcting toolInstalling of rack Teflon ring
a: 50 mm (1.97 in) dia.
b: 36 mm (1.42 in) dia.
c: 100 mm (3.94 in)
KV48103400
( — )
Torque adapterInspecting rotational torque
S-NT541
NT146
SGIA0516E
S-NT550
ZZA0824D

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
PS-5
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Revision: August 20072004 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEGS000MM
Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
PS-6PS-6PS-20PS-20PS-20PS-6PS-7PS-7EM-12PS-7PS-13PS-15PS-11PS-10PS-15
PR-3, "
NVH Troubleshooting Chart
"
FFD-7, "
NVH Troubleshooting Chart
"
FA X-4, "
NVH Troubleshooting Chart
"
FSU-4, "
NVH Troubleshooting Chart
"
WT-3, "
NVH Troubleshooting Chart
"
WT-3, "
NVH Troubleshooting Chart
"
FA X-4, "
NVH Troubleshooting Chart
"
BR-5, "
NVH Troubleshooting Chart
"
Possible cause and sus-
pected parts
Fluid level
Air in hydraulic system
Outer socket ball joint swinging force
Outer socket ball joint rotating torque
Outer socket ball joint end play
Steering fluid leakage
Steering wheel play
Steering gear rack sliding force
Drive belt looseness
Improper steering wheel
Improper installation or looseness of tilt lock lever
Mounting rubber deterioration
Steering column deformation or damage
Improper installation or looseness of steering column
Steering linkage looseness
PROPELLER SHAFT
FRONT FINAL DRIVE
WHEEL HUB
FRONT SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
SymptomNoise× × ××××× × × ××××××× ×
Shake××× × ××××× ×
Vibration××××× × ××× ×
Shimmy××× × ×××× ×
Shudder× × ×××× ×

STEERING WHEEL
PS-7
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Revision: August 20072004 QX56
STEERING WHEELPFP:48430
On-Vehicle Inspection and ServiceEGS000MQ
CHECKING CONDITION OF INSTALLATION

Check installation condition of steering gear assembly, front suspension, axle and steering column.

Check if movement exists when steering wheel is moved up and down, to the left and right and to the axial
direction.

Check if the mounting nuts for steering gear assembly are loose.
Refer to PS-15, "
POWER STEERING GEAR AND LINKAGE" .
CHECKING STEERING WHEEL PLAY
1. Turn tires straight ahead, start engine, then turn steering wheel to the left and right lightly, and measure
steering wheel movement on the outer circumference when steering wheel is turned up to the point where
tires start moving.
CHECKING NEUTRAL POSITION ON STEERING WHEEL

Check neutral position on steering wheel after confirming that front wheel alignment is correct. Refer to
FSU-6, "
Front Wheel Alignment" .
1. Turn tires straight ahead, check if steering wheel is in the neutral position.
2. If it is not in the neutral position, remove steering wheel and reinstall it correctly.
3. If the neutral position cannot be attained by repositioning the steering wheel two teeth or less on steering
stem, loosen tie-rod lock nuts of steering outer sockets, then adjust tie-rods by the same amount in the
opposite direction.
CHECKING STEERING WHEEL TURNING FORCE
1. Park vehicle on a level, dry surface and set parking brake.
2. Start engine.
3. Bring power steering fluid up to operating temperature of 60° – 80°C (140° – 176°F).
4. Tires need to be inflated to specified pressure. Refer to WT-33, "
Tire" .
5. Check steering wheel turning force using Tool when steering
wheel has been turned 360° from the neutral position.
6. If steering wheel turning force is out of specification, inspect
steering column. Refer to PS-11, "
INSPECTION AFTER
REMOVAL" .
7. If steering column meets specification, repair steering gear.
Refer to PS-17, "
Disassembly and Assembly" .
CHECKING FRONT WHEEL TURNING ANGLE
When checking front wheel turning angle, refer to FSU-8, "FRONT WHEEL TURNING ANGLE" . End play of the axial direction for steering wheel : 0 mm (0 in)
LGIA0024E
Steering wheel play on the outer circumference : 0 − 35 mm (0 − 1.38 in)
Tool number : J-44372
Steering wheel
turning force: 39 N (4 kg-f, 9 lb-f) or less
WGIA0035E

PS-8
STEERING WHEEL
Revision: August 20072004 QX56
Removal and InstallationEGS000MR
REMOVAL
1. Set the front wheels in the straight-ahead position.
2. Remove the driver air bag module. Refer to SRS-45, "
Removal and Installation" .
3. Disconnect steering wheel switches.
4. Remove the steering wheel center nut.
5. Remove the steering wheel using Tools.
CAUTION:
Place a piece of tape across the spiral cable so it will not be
rotated out of position.
6. Inspect the steering wheel near the puller holes for damage. If
damaged, replace the steering wheel.

Remove steering wheel rear cover and steering wheel
switches, if required.
INSTALLATION
Installation is in the reverse order of removal.

Align spiral cable correctly when installing steering wheel. Make
sure that the spiral cable is in the neutral position. The neutral
position is detected by turning left 2.6 revolutions from the right
end position and ending with the knob at the top.
CAUTION:
The spiral cable may snap due to steering operation if the cable is installed in an improper position.
Also, with the steering linkage disconnected, the cable may snap by turning the steering wheel
beyond the limited number of turns. (The spiral cable can be turned up to 2.6 turns from the neutral
position to both the right and left.)Tool number A: KV481J0010 (J-1859A)
B: KV481J0020 (J-42578)
WHIA0124E
Steering wheel
center nut : 34.3 N·m (3.5 kg-m, 25 ft-lb)
WGIA0038E

TILT SYSTEM
PS-9
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Revision: August 20072004 QX56
TILT SYSTEMPFP:48810
Removal and InstallationEGS000N8
TILT MOTOR AND TILT SENSOR
Removal
1. Remove the steering column cover and lower driver instrument panel. Refer to IP-10, "INSTRUMENT
PANEL ASSEMBLY" .
2. Remove knee protector.
3. Disconnect the tilt sensor electrical connector.
4. Remove the two tilt sensor screws and the tilt sensor.
5. Disconnect the tilt motor electrical connector.
6. Remove the tilt motor bolt and the tilt motor.
Installation
Installation is in reverse order of removal.
NOTE:
Make sure the tab in the tilt sensor is engaged in the bracket on the tilt motor.
LGIA0022E
1. Tilt sensor 2. Tilt motor
LGIA0026E

PS-10
STEERING COLUMN
Revision: August 20072004 QX56
STEERING COLUMNPFP:48810
Removal and InstallationEGS000NC
CAUTION:

Do not exert any load or impact in the axial direction immediately before or after column removal.

Do not to move steering gear during removal of steering column assembly.
REMOVAL
1. Remove combination switch and spiral cable from steering column assembly. Refer to SRS-47, "Removal
and Installation" .
2. Remove the tilt motor and tilt sensor. Refer to PS-9, "
Removal and Installation" .
3. Remove steering column cover, ADP steering switch and ignition key finisher. Refer to IP-12, "
Removal
and Installation" .
1. Driver air bag module 2. Steering wheel 3. Steering wheel side cover
4. Combination switch and spiral cable 5. Steering column assembly 6. Collar
7. Hole cover seal 8. Clamp 9. Hole cover mounting plate
10. Hole cover 11. Upper joint 12. Upper shaft
13. Boot clamp 14. Lower joint shaft 15. Boot and clips (plastic)
WGIA0106E

STEERING COLUMN
PS-11
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Revision: August 20072004 QX56
4. Remove lock nut and bolt, then separate upper shaft from upper
joint.
5. Remove two nuts and two bolts, then remove steering column
assembly from steering member.
6. Remove hole cover seal and clamp.
7. Remove mounting nuts, then remove hole cover from dash panel.
8. Raise vehicle, then remove mounting bolt (lower side) of lower
joint shaft and remove lower joint shaft and upper shaft as an
assembly.
INSPECTION AFTER REMOVAL

Check for damage to steering column jacket tube. If damage is found, replace steering column with new
one.

If vehicle has been in a collision, check column length “L1” and
“L2” as shown. If out of specification, replace steering column
with new one.

Check for proper lubrication, apply grease as necessary.
INSTALLATION
Installation is in the reverse order of removal.
LGIA0027E
LGIA0028E
LGIA0029E
Steering column length
L1 : 158 mm (6.22 in)
L2 : 262 mm (10.31 in)
SGIA0475E

PS-12
STEERING COLUMN
Revision: August 20072004 QX56
CAUTION:

When installing the steering column, finger-tighten all of the lower bracket and joint retaining
bolts; then tighten them to specification. Do not apply undue stress to the steering column.

The lower nut on the upper joint may not be reused.
NOTE:
Align slit of the coupling joint with projection on dust cover. Insert the
joint until surface "A" contacts surface "B".

After installation, turn steering wheel to make sure it moves
smoothly. Make sure the number of turns are the same from the
straight-forward position to left and right locks. Make sure that
the steering wheel is in a neutral position when driving straight
ahead.

When installing steering column to steering member, install
mounting nut from front side of vehicle.
INSPECTION AFTER INSTALLATION

After installing steering column to vehicle, check tilt device and its operation range is as specified.

Check if steering wheel operation can turn to the end of the left
and right stops smoothly.
SST 4 91 C
Range "A" : 61.3 mm (2.41 in)
WGIA0083E

PS-14
STEERING COLUMN
Revision: August 20072004 QX56
ASSEMBLY

Assembly is in the reverse order of disassembly.

Install new tamper resistant self-shear screws.
INSPECTION AFTER ASSEMBLY
When the steering wheel does not turn smoothly, check the steering column as follows:
1. Check the column bearings for damage or unevenness. Lubricate with recommended multi-purpose
grease. Replace the steering column as an assembly, if necessary.
2. Check the column tube for deformation or breakage. Replace the steering column as an assembly, if nec-
essary.
3. If the vehicle has been involved in a collision, or if noise and rat-
tles are heard during a turn, check the length "L" of the column.
If out of specification, replace the steering column as an assem-
bly.
4. Check for proper lubrication, apply grease as necessary.
5. Check for wear around the seal edges, replace the steering col-
umn as an assembly as necessary.
6. Check for corrosion or pitting around the seal sliding area.
7. After installing the steering column, check the tilt mechanism for
proper operation.
CAUTION:

Replace the column if it is depleted of grease, worn, dam-
aged, or if any scratches or coating separation is present
on the shaft seal area.

During lower joint detachment, insert a tool into the yoke
groove to prevent gouging damage.
WGIA0009E
Steering column length "L" : 610 mm (24.02 in)
WGIA0080E
Tilt mechanism range
(Manual tilt): 3° per notch at 5 stops
WGIA0026E