2006 INFINITI QX56 rack

PR-8
REAR PROPELLER SHAFT
Revision: November 20092006 QX56
REAR PROPELLER SHAFTPFP:37000
On-Vehicle ServiceEDS001W8
PROPELLER SHAFT VIBRATION
NOTE:
If vibration is present at high speed, check propeller shaft run out first, then check mounting between propeller
shaft and companion flange.
1. Measure the run out of the propeller shaft tube at several points
by rotating the final drive companion flange with your hands.
2. If the run out still exceeds specifications, disconnect the propel- ler shaft at the final drive companion flange; then rotate the com-
panion flange 90 °, 180 °, 270 ° degrees and reconnect propeller
shaft.
3. Check the run out again. If the run out still exceeds specifica- tions, replace the propeller shaft assembly.
4. After installation, check for vibration by driving vehicle.
INSPECTION
Inspect the propeller shaft tube for dents or cracks. If damaged, replace the propeller shaft assembly.
Removal and InstallationEDS001W9
Model 2S1350
Propeller shaft run out limit : 1.02 mm (0.0402 in) or less
SDIA1781E
WDIA0048E
1. Propeller shaft tube 2. Snap ring 3. Journal bearing
4. Sleeve yoke 5. Journal 6. Flange yoke

PS-2
PRECAUTIONS
Revision: November 20092006 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EGS000U4
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.
WARNING:

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 SystemEGS000U5

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.

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPS-5
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Revision: November 2009 2006 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEGS000U8
Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
PS-6PS-6PS-18PS-18PS-18PS-6PS-7PS-7
EM-13, "
Checking Drive Belts
"
PS-7PS-13PS-15PS-11PS-10PS-15

PR-3, "
NVH Troubleshooting Chart
"
FFD-6, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
FSU-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
FAX-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
SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
Symptom Noise
× × ××××× × × ××××××× ×
Shake ×××× ××××× ×
Vibration ××××× × ××× ×
Shimmy ××× × ×××× ×
Shudder × × ×××× ×

PS-6
POWER STEERING FLUID
Revision: November 20092006 QX56
POWER STEERING FLUIDPFP:KLF20
Checking Fluid LevelEGS000U9
Check power steering fluid level with engine off, referring to the scale
on reservoir tank.
Use HOT range for fluid temperatures of 50° – 80 °C (122 ° – 176° F).
Use COLD range for fluid temperatures of 0 ° – 30° C (32 ° – 86 °F).
CAUTION:

Do not overfill.

Do not reuse any used power steering fluid.

Recommended fluid is Genuine NISSAN PSF or equivalent.
Refer to MA-11, "
RECOMMENDED FLUIDS AND LUBRI-
CANTS" .
Checking Fluid LeakageEGS000UA
Check the hydraulic piping lines for improper attachment and for
leaks, cracks, damage, loose connections, chafing or deterioration.
1. Run engine until fluid temperature reaches 50 ° – 80 °C (122 ° –
176° F) in reservoir tank. Keep engine speed idle.
2. Turn steering wheel right-to-left several times.
3. Hold steering wheel at each “lock” position for five seconds to
check fluid leakage.
CAUTION:
Do not hold steering wheel in a locked position for more
than 10 seconds. (There is the possibility that oil pump may
be damaged.)
4. If fluid leakage at connections is noticed, then loosen flare nut and then retighten. Do not over tighten con- nector as this can damage O-ring, washer and connector.
5. If fluid leakage from oil pump is noticed, check oil pump. Refer to PS-21, "
POWER STEERING OIL
PUMP" .
6. Check steering gear boots for accumulation of fluid indicating a leak from the steering gear.
Air Bleeding Hydraulic SystemEGS000UB
Incomplete air bleeding causes the following. When this happens, bleed air again.

Air bubbles in reservoir tank.

Clicking noise in oil pump.

Excessive buzzing in oil pump.
NOTE:
When vehicle is stationary or while steering wheel is being turned slowly, some noise may be heard from
oil pump or gear. This noise is normal and does not affect any system.
1. Stop engine, and then turn steering wheel fully to right and left several times. CAUTION:
Do not allow steering fluid reservoir tank to go below the MIN level line. Check tank frequently and
add fluid as needed.
2. Run engine at idle speed. Turn steering wheel fully right and then fully left, hold for about three seconds. Then check for fluid leakage.
3. Repeat step 2 several times at about three second intervals. CAUTION:
Do not hold steering wheel in the locked position for more than 10 seconds. (There is the possibil-
ity that oil pump may be damaged.)
4. Check for air bubbles or cloudy fluid.
5. If air bubbles or cloudiness still exists, stop engine, perform steps 2 and 3 again until air bubbles or cloud- iness does not exist.
6. Stop engine, check fluid level.
LGIA0021E
SGIA0506E

TILT SYSTEMPS-9
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Revision: November 2009 2006 QX56
TILT SYSTEMPFP:48810
Removal and InstallationEGS000UE
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.
BGIA0009E
1. Tilt sensor 2. Tilt motor
LGIA0026E

PS-12
STEERING COLUMN
Revision: November 20092006 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 operation range is within specification.

Check if steering wheel operation can turn to the end of the left
and right stops smoothly.
SST491C
Range "A" : 61.3 mm (2.41 in)
WGIA0083E

POWER STEERING GEAR AND LINKAGEPS-15
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Revision: November 2009 2006 QX56
POWER STEERING GEAR AND LINKAGEPFP:49001
Removal and InstallationEGS000UH
CAUTION:
Spiral cable may snap due to steering operation if steering column is separated from steering gear
assembly. Therefore secure steering wheel to avoid turning.
REMOVAL
1. Turn wheels to the straight-ahead position.
2. Remove tires from vehicle using power tool.
3. Remove undercover using power tool.
4. On 4WD model, remove front final drive, then support drive shafts with wire. Refer to FFD-12, "
Removal
and Installation" .
5. Remove cotter pin at steering outer socket and discard, then loosen nut.
6. Remove steering outer socket from steering knuckle using Tool. Be careful not to damage ball joint boot.
CAUTION:
Temporarily tighten mounting nut to prevent damage to
threads and to prevent Tool from coming off.
7. On 2WD model, remove stabilizer bar mounting bolts and reposition stabilizer bar. Refer to FSU-12,
"Removal and Installation" .
1. Cotter pin2. Mounting bracket3. Mounting insulator
4. Steering gear assembly 5. Washer
WGIA0127E
Tool number : HT72520000 (J-25730-A)
SDIA1434E

PS-18
POWER STEERING GEAR AND LINKAGE
Revision: November 20092006 QX56
INSPECTION AFTER DISASSEMBLY
Boot
Check boot for tears, cracks and deformation. Replace if necessary.
Gear Housing Assembly
Check gear housing assembly for dents, cracks or damage. Replace as an assembly if necessary.
Outer Socket and Inner Socket
SWING TORQUE

Measure the swing torque, using Tool. When ball stud and inner
socket start moving the measured value must be within the
specification. If the reading is outside the specification, replace
the socket.
ROTATING TORQUE

Measure the rotating torque, using Tool. If the value is outside
the specification, replace the outer sockets.
AXIAL END PLAY

Apply a load of 490 N (50 kg-f, 110 lb-f) to the ball stud axially.
Use a dial gauge to measure the amount of the movement that
the stud makes. If the value is outside the specification, replace
the sockets. Tool number : — (J-44372)
WGIA0131E
Item
Outer socket Inner socket
Measuring point Cotter pin hole of stud Shown as L: 83.2 mm (3.276 in)
Swing torque 0.3 − 2.9 N ·m (0.03 − 0.29 kg-m, 3 − 25 in-lb) 1.0 − 7.8 N·m (0.11 − 0.79 kg-m, 9 − 69 in-lb)
Measuring value (F) 4.84 − 46.7 N (0.50 − 4.7 kg-f, 4 - 34 lb-f) 12.1 − 93.7 N (1.3 − 9.5 kg, 9 − 69 lb)
Tool number : ST3127S000 (J-25765-A)
Rotating torque : 0.3 − 2.9 N·m (0.03 − 0.29 kg-m,
3 − 25 in-lb)
WGIA0132E
Outer socket : 0.5 mm (0.020 in) or less
Inner socket : 0.2 mm (0.008 in) or less
SGIA0057E