INFINITI QX4 2005 Factory Service Manual

RFD-24
REAR FINAL DRIVE ASSEMBLY
Revision: October 20052005 QX56
8. Tighten the drive pinion nut by very small increments until the
specified preload is achieved, when checking the preload, turn
drive pinion in both directions several times.

If the pinion bearing preload is less than specification, tighten
the drive pinion nut.

If pinion bearing preload is greater than specification, replace
the pinion bearing adjusting spacer.
INSTALLATION OF DIFFERENTIAL CASE ASSEMBLY
1. Select the side bearing adjusting washer. Refer to RFD-19, "SIDE BEARING PRELOAD" .
2. Install the differential case assembly with side bearing outer
races into the gear carrier.
3. Insert the left and right side bearing adjusting washers into place
between the side bearings and the gear carrier.
4. Install the side bearing caps. Align the matching mark on the
bearing cap with the matching mark on the gear carrier, and
tighten the bearing cap bolts to specification.
5. Install the side oil seals. Refer to RFD-8, "
Removal and Installa-
tion" . Tool number : ST3127S000
Pinion bearing
preload: 1.77 - 2.64 N·m (0.18 - 0.26 kg-m,
16 - 23 in-lb)
SPD8 84
SPD9 19
SPD9 24
Bearing cap bolts : 93 N·m (9.5 kg-m, 69 fl-lb)
SPD8 89

REAR FINAL DRIVE ASSEMBLY
RFD-25
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RFD
Revision: October 20052005 QX56
6. Measure the drive gear-to-drive pinion backlash with a dial indi-
cator at several points.

If the backlash is less than specification, adjust the washer thickness. Decrease the thickness of the left
washer and increase the thickness of the right washer by the same amount.

If the backlash is greater than specification, adjust the washer thickness. Increase the thickness of the
left washer and decrease the thickness of the right washer by the same amount.

Never change the total amount of the washers as it will change the bearing preload.
7. Check the total preload using Tool.
When checking the preload, turn the drive pinion in both direc-
tions several times to seat the bearing rollers correctly.

If the preload is greater than specification, remove the same amount of washer thickness from each
side.

If the preload is less than specification, add the same amount of washer thickness to each side.

Never add or remove a different amount of washer thickness from each side. A difference in the amount
of washer thickness will change the drive gear-to-drive pinion backlash.
8. Recheck the drive gear-to-drive pinion backlash. Increase or decrease in thickness of the washers will
change the drive gear-to-drive pinion backlash.

Check whether the backlash varies excessively in different places. Foreign matter may be caught
between the drive gear and the differential case causing the variation in backlash.

The backlash can vary greatly even when the drive gear runout is within specification. To correct this
variation, replace the hypoid gear set or differential case.
9. Check runout of drive gear using a dial indicator.
10. Check the tooth contact.
Refer to RFD-14, "
TOOTH CONTACT" . Drive gear to drive pinion backlash : 0.13 - 0.18 mm
(0.0051 - 0.0070 in)
SPD5 13
Tool number : ST3127S000
SPD8 84
Total preload : 2.05 - 4.11 N·m (0.21 - 0.42 kg-m, 19 - 36 in-lb)
Runout limit : 0.05 mm (0.0020 in) or less
SPD5 24

RFD-26
REAR FINAL DRIVE ASSEMBLY
Revision: October 20052005 QX56
11. Install the rear cover on the gear carrier. Apply Genuine NISSAN
RTV Sealant or equivalent, to the rear cover as shown. Refer to
GI-45, "
Recommended Chemical Products and Sealants" .
Rear cover bolts : 44 N·m (4.5 kg-m, 32 ft-lb)
WDIA0063E

SERVICE DATA AND SPECIFICATIONS (SDS)
RFD-27
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Revision: October 20052005 QX56
SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
General SpecificationsEDS003QF
Drive Gear RunoutEDS003QG
Unit: mm (in)
Side Gear Adjustment EDS003QH
Unit: mm (in)
AVAILABLE SIDE GEAR THRUST WASHERS
Unit: mm (in)
Drive Pinion Height AdjustmentEDS003QI
AVAILABLE PINION HEIGHT ADJUSTING WASHERS
Unit: mm (in)
Drive Pinion Preload AdjustmentEDS0 03 QJ
GradeSE LE
Standard Optional Standard
Final drive model R230 (2 - pinion)
Gear ratio 2.937 : 1 3.357 : 1
Number of teeth (drive gear / drive pinion) 47 / 16 47 / 14
Oil capacity (approx.)
1.75 (3 3/4 US pt, 3 1/8 Imp pt)
Final drive modelR230 (2 - pinion)
Drive gear runout limit0.05 (0.0020) or less
Final drive modelR230 (2 - pinion)
Clearance limit between side gear and differential case 0.20 (0.0079) or less
Final drive modelR230 (2 - pinion)
Thrust washerThickness Part number
1.75 (0.0688) 38424 7S000
1.80 (0.0708) 38424 7S001
1.85 (0.0728) 38424 7S002
Final drive model R230 (2 - pinion)
Adjusting washerThickness Part number Thickness Part number
2.59 (0.1020) 38154 40P00 2.79 (0.1098) 38154 40P10
2.61 (0.1028) 38154 40P01 2.81 (0.1106) 38154 40P11
2.63 (0.1035) 38154 40P02 2.83 (0.1114) 38154 40P12
2.65 (0.1043) 38154 40P03 2.85 (0.1122) 38154 40P13
2.67 (0.1051) 38154 40P04 2.87 (0.1130) 38154 40P14
2.69 (0.1059) 38154 40P05 2.89 (0.1138) 38154 40P15
2.71 (0.1067) 38154 40P06 2.91 (0.1146) 38154 40P16
2.73 (0.1075) 38154 40P07 2.93 (0.1154) 38154 40P17
2.75 (0.1083) 38154 40P08 2.95 (0.1161) 38154 40P18
2.77 (0.1091) 38154 40P09 2.97 (0.1169) 38154 40P19
Final drive modelR230 (2 - pinion)
Drive pinion preload 1.77 − 2.64 N·m (0.18 − 0.26 kg−m, 16 − 23 in-lb)

RFD-28
SERVICE DATA AND SPECIFICATIONS (SDS)
Revision: October 20052005 QX56
Side Bearing Preload Adjustment EDS003QK
SIDE BEARING ADJUSTING WASHERS
Unit: mm (in)
Total Preload AdjustmentEDS003QL
Final drive modelR230 (2 - pinion)
Side bearing preload (reference value) 0.20 − 0.52 N·m (0.02 − 0.05 kg−m, 2 − 4 in-lb)
Drive gear bolt pulling force (by spring gauge) 29.4 − 147 N (3 − 15 kg-f, 22 − 108 lb-f)
Final drive model R230 (2 - pinion)
Adjusting washerThickness Part number Thickness Part number
2.00 (0.0787) 38453 40P00 2.35 (0.0925) 38453 40P07
2.05 (0.0807) 38453 40P01 2.40 (0.0945) 38453 40P08
2.10 (0.0827) 38453 40P02 2.45 (0.0965) 38453 40P09
2.15 (0.0846) 38453 40P03 2.50 (0.0984) 38453 40P10
2.20 (0.0866) 38453 40P04 2.55 (0.1004) 38453 40P11
2.25 (0.0886) 38453 40P05 2.60 (0.1024) 38453 40P12
2.30 (0.0906) 38453 40P06
Final drive modelR230 (2 - pinion)
Total preload with oil seal 2.05 − 4.11 N·m (0.21 − 0.42 kg−m, 19 − 36 in-lb)
Drive gear to drive pinion backlash 0.13 − 0.18 mm (0.0051 − 0.0070 in)

RSU-1
REAR SUSPENSION
E SUSPENSION
CONTENTS
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SECTION RSU
A
B
RSU
Revision: October 20052005 QX56 PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Rear Suspension ............................ 3
PREPARATION ........................................................... 4
Commercial Service Tools ........................................ 4
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 5
NVH Troubleshooting Chart ..................................... 5
CAN COMMUNICATION ............................................ 6
System Description .................................................. 6
TROUBLE DIAGNOSIS .............................................. 7
How to Perform Trouble Diagnoses for Quick and
Accurate Repair ....................................................... 7
INTRODUCTION ................................................... 7
CLARIFY CONCERN ............................................ 7
WORK FLOW ........................................................ 8
Component Parts and Harness Connector Location ..... 9
Wiring Diagram — A/SUSP — ............................... 10
Basic Inspection ..................................................... 12
AIR HOSES ......................................................... 12
POWER SYSTEM TERMINAL LOOSENESS
AND BATTERY INSPECTION ............................ 12
CK SUSP INDICATOR LAMP INSPECTION ...... 12
CK SUSP Indicator Lamp Timing ........................... 12
Control Unit Input/Output Signal Standard ............. 12
CONSULT-II Function (AIR LEVELIZER) ............... 13
CONSULT-II BASIC OPERATION PROCEDURE
... 13
WORK SUPPORT ............................................... 14
SELF-DIAGNOSIS .............................................. 14
DATA MONITOR ................................................. 15
ACTIVE TEST ..................................................... 16
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ....................................................................... 17
Height Sensor System Inspection .......................... 17
Exhaust Valve Solenoid System Inspection ........... 19
Compressor Motor, Compressor Motor Relay and Circuit Inspection .................................................... 20
TROUBLE DIAGNOSES FOR SYMPTOMS ............ 23
Load Leveling Rear Air Suspension System Does
Not Operate ............................................................ 23
CK SUSP Indicator Lamp Stays On When Ignition
Switch Is Turned On ............................................... 24
REAR SUSPENSION ASSEMBLY ........................... 25
Components ........................................................... 25
On-Vehicle Inspection and Service ......................... 26
SHOCK ABSORBER INSPECTION .................... 26
Wheel Alignment Inspection ................................... 27
PRELIMINARY INSPECTION ............................. 27
GENERAL INFORMATION AND RECOMMEN-
DATIONS ............................................................. 27
THE ALIGNMENT PROCESS ............................. 28
CAMBER ............................................................. 28
TOE-IN ................................................................ 28
REAR SUSPENSION MEMBER ............................... 30
Removal and Installation ........................................ 30
REMOVAL ........................................................... 31
INSPECTION AFTER REMOVAL ....................... 32
INSTALLATION ................................................... 33
SHOCK ABSORBER ................................................ 34
Removal and Installation ........................................ 34
REMOVAL ........................................................... 34
INSTALLATION ................................................... 34
INSPECTION AFTER INSTALLATION ................ 34
SUSPENSION ARM .................................................. 35
Removal and Installation ........................................ 35
REMOVAL ........................................................... 35
INSPECTION AFTER REMOVAL ....................... 35
INSTALLATION ................................................... 36
FRONT LOWER LINK .............................................. 37
Removal and Installation ........................................ 37
REMOVAL ........................................................... 37
INSPECTION AFTER REMOVAL ....................... 37
INSTALLATION ................................................... 38

RSU-2Revision: October 20052005 QX56 REAR LOWER LINK & COIL SPRING ..................... 39
Removal and Installation ........................................ 39
REMOVAL ........................................................... 39
INSPECTION AFTER REMOVAL ........................ 40
INSTALLATION .................................................... 40
STABILIZER BAR ..................................................... 41
Removal and Installation ........................................ 41
REMOVAL ........................................................... 41
INSTALLATION .................................................... 41
Inspection ............................................................... 41
REAR LOAD LEVELING AIR SUSPENSION COM-
PRESSOR ASSEMBLY ............................................ 42
Removal and Installation ........................................ 42
REMOVAL ........................................................... 42
INSTALLATION .................................................... 43HEIGHT SENSOR .....................................................44
Removal and Installation .........................................44
REMOVAL ............................................................44
INSTALLATION ....................................................45
CONTROL UNIT ........................................................46
Removal and Installation .........................................46
REMOVAL ............................................................46
INSTALLATION ....................................................46
Initialization Procedure ............................................46
SERVICE DATA AND SPECIFICATIONS (SDS) ......47
Wheel Alignment .....................................................47
Ball Joint .................................................................47
Wheelarch Height (Unladen*
1 ) ...............................48

PRECAUTIONS
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Revision: October 20052005 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EES001GX
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.
WA RN ING:

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 Rear SuspensionEES001GY

When installing the rubber bushings, the final tightening must be done under unladen condition and with
the tires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immedi-
ately.

Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The
spare tire, jack, hand tools, and mats are in their designated positions.

After installing suspension components, check the wheel alignment.

Caulking nuts are not reusable. Always use new caulking nuts for installation. New caulking nuts are pre-
oiled, do not apply any additional lubrication.

RSU-4
PREPARATION
Revision: October 20052005 QX56
PREPARATIONPFP:00002
Commercial Service ToolsEES001H0
Tool nameDescription
Power tool

Removing wheel nuts

Removing brake caliper assembly

Removing rear suspension component
parts
PBIC0190E

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
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NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEES001H1
Use chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: Applicable Reference page
RSU-25RSU-34
—
—
—
RSU-25
RSU-27RSU-41
PR-3, "
NVH Troubleshooting Chart
"
RAX-4, "
NVH Troubleshooting Chart
"
FAX -4, "
NVH Troubleshooting Chart
" (FAX)
FSU-4, "
NVH Troubleshooting Chart
" (FSU)
WT-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
RAX-4, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
BR-5, "
NVH Troubleshooting Chart
"
Possible cause and SUSPECTED PARTS
Improper installation, looseness
Shock absorber deformation, damage or deflection
Bushing or mounting deterioration
Parts interference
Spring fatigue
Suspension looseness
Incorrect wheel alignment
Stabilizer bar fatigue
PROPELLER SHAFT
DIFFERENTIAL
FRONT AXLE AND FRONT SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
STEERING
SymptomNoise×××××× ××× ×××××
Shake×××× × × × ×××××
Vibration××××× × × × × ×
Shimmy×××× × × ×× ××
Shudder ××× × ×× ××
Poor quality ride or handling××××× ×× × ××