torque INFINITI QX56 2007 Factory Service Manual

REAR FINAL DRIVE ASSEMBLY
RFD-29
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4. Align the lock pin hole on the differential case with the lock pin
hole on the pinion mate shaft, and install the pinion mate shaft.
5. Measure the side gear end play. If necessary, select the appro-
priate side gear thrust washers. Refer to RFD-32, "
Inspection
and Adjustment".
6. Drive a new lock pin into the pinion mate shaft until it is flush
with the differential case using suitable tool.
CAUTION:
Do not reuse lock pin.
7. Align the matching mark of the differential case with the mark of
the drive gear, then place the drive gear onto the differential
case.
8. Apply thread locking sealant into the threaded holes of the drive
gear and install the bolts.
• Use Genuine Medium Strength Thread Locking Sealant or
equivalent. Refer to GI-45, "
Recommended Chemical Product
and Sealant".
CAUTION:
Make sure the drive gear back and threaded holes are
clean.
9. Tighten the drive gear bolts to the specified torque. After tighten-
ing the drive gear bolts to the specified torque, tighten an addi-
tional 34° using Tool.
CAUTION:
• Always use Tool. Avoid tightening based on visual check
alone.
• Tighten drive gear bolts in a crisscross pattern.
SDIA0195J
WDIA0131E
SDIA2593E
SDIA2594E
Tool number : KV10112100-A (BT-8653-A)
SDIA0247J

RFD-30
< SERVICE INFORMATION >
REAR FINAL DRIVE ASSEMBLY
10. Press the side bearing inner races into the differential case
using Tools.
CAUTION:
Do not reuse side bearing inner race.
11. Install the differential case assembly with the side bearing outer
races into the gear carrier.
12. Measure the side bearing preload torque. If necessary, select
the appropriate side bearing adjusting washers.
13. Insert the selected left and right side bearing adjusting washers
in place between the side bearings and gear carrier.
14. Install the side bearing caps with the matching marks aligned
and tighten the side bearing cap bolts to the specified torque.
15. Check and adjust the drive gear runout, tooth contact, drive gear to drive pinion backlash, and total pre-
load torque.
Recheck the above items.
16. Install the side flanges. Tool number A: KV38100200 (J-26233)
B: ST33081000 ( — )
SPD353
SPD919
SPD924
SPD889

REAR FINAL DRIVE ASSEMBLY
RFD-31
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17. Apply a 3.2mm (0.126 in) bead of sealant to the mating surface
of the carrier cover.
• Use Genuine Silicone RTV or equivalent. Refer to GI-45,
"Recommended Chemical Product and Sealant".
CAUTION:
Remove any old sealant adhering to the mating surfaces.
Also remove any moisture, oil, or foreign material adhering
to the application and mating surfaces.
18. Install the carrier cover to the gear carrier. Tighten the bolts to
the specified torque.
19. Install the side flange.
Side Flange
1. Apply multi-purpose grease to the lips of the new side oil seal.
Then drive the new side oil seal in evenly until it becomes flush
with the gear carrier using Tool.
CAUTION:
• Do not reuse side oil seal.
• Do not incline the new side oil seal when installing.
• Apply multi-purpose grease to the lips of the new side oil
seal.
2. Install the side flange using Tool.
a. Install the Tool to the side oil seal as shown.
b. Insert the side flange until the serrated part of the side flange
has engaged the serrated part of the side gear and remove the
Tool.
c. Drive in the side flange using suitable tool.
NOTE:
Installation is completed when the driving sound of the side
flange turns into a sound which seems to affect the whole rear
final drive assembly.
WDIA0282E
Tool number : ST35271000 ( — )
SPD560
Tool number : KV38107900 (J-39352)
SDIA0822E

RFD-32
< SERVICE INFORMATION >
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationINFOID:0000000003532608
Inspection and AdjustmentINFOID:0000000003532609
DRIVE GEAR RUNOUT
Unit: mm (in)
SIDE GEAR CLEARANCE
Unit: mm (in)
PRELOAD TORQUE
Unit: N·m (kg-m, in-lb)
BACKLASH
Unit: mm (in)
COMPANION FLANGE RUNOUT
Unit: mm (in)
SELECTIVE PARTS
Side Gear Thrust Washer
Applied modelVK56DE
2WD 4WD
Final drive modelR230
Gear ratio 2.937 3.357
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)
Number of pinion gears 2
Drive pinion adjustment spacer type Collapsible
Item Runout limit
Drive gear back face0.05 (0.0020) or less
Item Specification
Side gear back clearance
(Clearance limit between side gear and differential case for adjusting
side gear backlash)0.20 (0.0079) or less
(Each gear should rotate smoothly without excessive resis-
tance during differential motion.)
Item Specification
Drive pinion bearing preload torque 1.77 − 2.64 N·m (0.18 − 0.26 kg−m, 16 − 23 in-lb)
Side bearing preload torque (reference value determined by drive
gear bolt pulling force)0.20 − 0.52 N·m (0.02 − 0.05 kg−m, 2 − 4 in-lb)
Drive gear bolt pulling force (by spring gauge) 34.2 − 39.2 N (3.5 − 4 kg, 7.7 − 8.8 lb)
Total preload torque
(Total preload torque = drive pinion bearing preload torque + Side
bearing preload torque)2.05 − 4.11 N·m (0.21 − 0.42 kg−m, 19 − 36 in-lb)
Item Specification
Drive gear to drive pinion gear 0.13 − 0.18 (0.0051 − 0.0070)
Item Runout limit
Outer side of the companion flange 0.08 (0.0031) or less

SERVICE DATA AND SPECIFICATIONS (SDS)
RSU-43
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SERVICE DATA AND SPECIFICATIONS (SDS)
Wheel AlignmentINFOID:0000000003532682
Ball JointINFOID:0000000003532683
Camber
Degree minute (decimal degree)Minimum 0° 0′ (0°)
Nominal - 0° 30′ (-0.5°)
Maximum - 1° 0′ (-1.0°)
Cross camber 0° 45′ (0.75°)
To e - i nDistance (A - B)Minimum 0 mm (0 in)
Nominal 3.3 mm (0.130 in)
Maximum 6.6 mm (0.260 in)
Cross toe 2 mm (0.079 in)
Angle (left, right)
Degree minute (decimal degree)Minimum 0° 0′ (0°)
Nominal 0° 7′ (0.11°)
Maximum 0° 14′ (0.22°)
Cross toe 0° 8′ (0.14°)
SFA234AC
Swinging force (measurement point: cotter pin hole of ball stud) “A” 11.4 - 145.5 N (1.16 - 14.8 kg, 2.56 - 32.7 lb)
Turning torque “B” 0.5 - 6.4 N·m (0.06 - 0.65 kg-m, 5 - 56 in-lb)
Vertical end play “C”0 mm (0 in)
SFA858A

PRECAUTIONS
SE-3
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SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000003533149
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 performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
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 har-
ness connectors.
Precaution for WorkINFOID:0000000003533150
• When removing or disassembling each component, be careful not to damage or deform it. If a component
may be subject to interference, be sure to protect it with a shop cloth.
• When removing (disengaging) components with a screwdriver or similar tool, be sure to wrap the component
with a shop cloth or vinyl tape to protect it.
• Protect the removed parts with a shop cloth and keep them.
• Replace a deformed or damaged clip.
• If a part is specified as a non-reusable part, always replace it with new one.
• Be sure to tighten bolts and nuts securely to the specified torque.
• After re-installation is completed, be sure to check that each part works normally.
• Follow the steps below to clean components.
- Water soluble foul: Dip a soft cloth into lukewarm water, and wring the water out of the cloth to wipe the
fouled area.
Then rub with a soft and dry cloth.
- Oily foul: Dip a soft cloth into lukewarm water with mild detergent (concentration: within 2 to 3%), and wipe
the fouled area.
Then dip a cloth into fresh water, and wring the water out of the cloth to wipe the detergent off. Then rub with
a soft and dry cloth.
• Do not use organic solvent such as thinner, benzene, alcohol, or gasoline.
• For genuine leather seats, use a genuine leather seat cleaner.

TF-4
< SERVICE INFORMATION >
PRECAUTIONS
Precaution
INFOID:0000000003532508
•Before connecting or disconnecting the transfer control unit
harness connector, turn ignition switch “OFF” and disconnect
battery ground cable. Failure to do so may damage the trans-
fer control unit. Battery voltage is applied to transfer control
unit even if ignition switch is turned “OFF”.
•When connecting or disconnecting pin connectors into or
from transfer control unit, take care not to damage pin termi-
nals (bend or break).
When connecting pin connectors make sure that there are not
any bends or breaks on transfer control unit pin terminals.
•Before replacing transfer control unit, perform transfer con-
trol unit input/output signal inspection and make sure transfer
control unit functions properly. Refer to TF-35, "
Transfer Con-
trol Unit Input/Output Signal Reference Value".
Service NoticeINFOID:0000000003532509
• After overhaul refill the transfer with new transfer fluid.
• Check the fluid level or replace the fluid only with the vehicle parked on level ground.
• During removal or installation, keep inside of transfer clear of dust or dirt.
• Disassembly should be done in a clean work area.
• Before proceeding with disassembly, thoroughly clean the transfer. It is important to prevent the internal
parts from becoming contaminated by dirt or other foreign matter.
• Check for the correct installation status prior to removal or disassembly. If matchmarks are required, be cer-
tain they do not interfere with the function of the parts when applied.
• All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.
• Check appearance of the disassembled parts for damage, deformation, and unusual wear. Replace them
with new ones if necessary.
• Gaskets, seals and O-rings should replaced any time the transfer is disassembled.
• In principle, tighten bolts or nuts gradually in several steps working diagonally from inside to outside. If tight-
ening sequence is specified, use it.
• Observe the specified torque when assembling.
• Clean and flush the parts sufficiently and blow-dry them.
• Be careful not to damage sliding surfaces and mating surfaces.
SEF289H
SEF291H
MEF040DB

ALL-MODE 4WD SYSTEM
TF-17
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*: After 2.5 seconds have elapsed.
• 4WD shift switch, PNP switch, Neutral-4LO switch, vehicle speed sensor and throttle position sensor are
used in conjunction with the transfer motor.
WAIT DETECTION SWITCH
• The wait detection switch operates when there is “circulating” torque produced in the propeller shaft (L→H)
or when there is a phase difference between 2-4 sleeve and clutch drum (H→L). After the release of the “cir-
culating” torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts. A difference
may occur between the operation of the 4WD shift switch and actual drive mode. At this point, the wait
detection switch senses an actual drive mode.
• The wait detection switch operates as follows.
- 4WD lock gear (clutch drum) locked: ON
- 4WD lock gear (clutch drum) released: OFF
• The wait detection switch senses an actual drive mode and the 4WD shift indicator lamp indicates the vehi-
cle drive mode.
NEUTRAL-4LO SWITCH
The neutral-4LO switch detects that transfer gear is in neutral or 4LO (or shifting from neutral to 4LO) condi-
tion by L-H shift fork position.
AT P S W I T C H
ATP switch detects if transfer gear is in a neutral condition by L-H shift fork position.
NOTE:
Transfer gear may be in a neutral condition in 4H-4LO.
2-4WD SHIFT SOLENOID VALVE
The 2-4WD shift solenoid valve operates to apply oil pressure to the wet-multiplate clutch, depending on the
drive mode. The driving force is transmitted to the front wheels through the clutch so the vehicle is set in the
4WD mode. Setting the vehicle in the 2WD mode requires no pressure buildup. In other words, pressure force
applied to the wet-multiplate clutch becomes zero.
CLUTCH PRESSURE SOLENOID VALVE
The clutch pressure solenoid valve distributes torque (front and rear) in AUTO mode.
4H (LOCK) and 4LO“N” position 0 — ON
“P” position 00 - 0.07/8 OFF*
0.07/8 - 1/8 HOLD
1/8 - MAX ON
Other than “R” position0 < VSS ≤ 50 km/h (31 MPH)
— ON
50 km/h (31 MPH) < VSS < 55
km/h (34 MPH) HOLD
55 km/h (34 MPH) ≤ VSS OFF
“R” position — — ON
“R” position — — ON
AUTO“P” or “N” position00 - 0.07/8 OFF*
0.07/8 - 1/8 HOLD
1/8 - MAX ON
0 < VSS ≤ 50 km/h (31 MPH)
— ON
50 km/h (31 MPH) < VSS < 55
km/h (34 MPH) HOLD
55 km/h (34 MPH) ≤ VSS OFF
Other than “R”, "P" and "N"
position0 < VSS ≤ 50 km/h (31 MPH)
— ON
50 km/h (31 MPH) < VSS < 55
km/h (34 MPH) HOLD
55 km/h (34 MPH) ≤ VSS OFF 4WD shift switch A/T selector lever positionVehicle speed
(VSS)Accelerator pedal positionMotor relay drive
command

TF-18
< SERVICE INFORMATION >
ALL-MODE 4WD SYSTEM
LINE PRESSURE SWITCH
• With the transfer system design, control of the oil pressure provides the transmission of drive torque to the
front wheels. The main pressure to control the oil pressure is referred to as the line pressure.
• The line pressure switch determines whether or not adequate line pressure has built up under different oper-
ating conditions.
• The line pressure switch turns ON when line pressure is produced.
• The line pressure switch senses line pressure abnormalities and turns the 4WD warning lamp ON.
CLUTCH PRESSURE SWITCH
• The clutch pressure switch determines whether or not adequate clutch pressure has built up under different
operating conditions.
• The clutch pressure switch turns ON when clutch pressure is produced.
• The clutch pressure switch senses clutch pressure abnormalities and turns the 4WD warning lamp ON.
TRANSFER FLUID TEMPERATURE SENSOR
The transfer temperature sensor detects the transfer fluid temperature and sends a signal to the transfer con-
trol unit.
TRANSFER CONTROL UNIT
• Transfer control unit controls transfer control device by input signals of each sensor and each switch.
• Self-diagnosis can be done.
TRANSFER CONTROL DEVICE
The transfer control device changes the state of transfer assembly between 2WD, AUTO, 4H⇔4LO with the
2WD, AUTO, 4H and 4LO signals of 4WD shift switch.
NOTE:
• To shift between 4H⇔4LO, stop the vehicle, depress the brake pedal and shift the transmission selector to
the "N" position. Depress and turn the 4WD shift switch. The shift switch will not shift to the desired mode if
the transmission is not in "N" or the vehicle is moving. The 4LO indicator lamp will be lit when the 4LO is
engaged.
• Actuator motor and actuator position switch are integrated.
4WD SHIFT SWITCH AND INDICATOR LAMP
4WD Shift Switch
The 4WD shift switch allows selection from 2WD, AUTO, 4H or 4LO.
4WD Shift Indicator Lamp
• Displays driving conditions selected by 4WD shift switch with 2WD, AUTO and 4H indicators while engine is
running. (When 4WD warning lamp is turned on, all 4WD shift indicator lamps are turned off.)
• Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.
4LO Indicator Lamp
• Displays 4LO condition while engine is running. 4LO indicator lamp flashes if transfer gear does not shift
completely under 2WD, AUTO, 4H⇔4LO. (When 4WD warning lamp is turned on, 4LO indicator lamp is
turned off.)
• Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.
4WD WARNING LAMP
Turns ON or FLASH when there is a malfunction in 4WD system.
Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF for approximately 1
second after the engine starts if system is normal.
4WD Warning Lamp Indication
Condition Content 4WD warning lamp
During self-diagnosis Indicates the malfunction position by number of flickers. Flickers at malfunction mode.
Lamp check*Checks the lamp by turning ON during engine starting. After
engine starts, it turns OFF if there are no malfunctions.ON
Malfunction in 4WD system*Turns ON to indicate malfunction. When ignition switch is
turned to “OFF” or the malfunction is corrected, it turns OFF.ON
When vehicle is driven with different
diameters of front and rear tiresFlickers once every 2 seconds.
Turns OFF when ignition switch is “OFF”.Flickers once every 2 sec-
onds.

ALL-MODE 4WD SYSTEM
TF-19
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*: When 4WD warning lamp is ON, all the 4WD shift indicator lamps turn OFF.
ATP WARNING LAMP
Even if A/T selector lever is in “P” position, vehicle may move because A/T parking mechanism does not oper-
ate when transfer is under neutral condition. ATP warning lamp is turned on so as to indicate this condition to
the driver.
SchematicINFOID:0000000003532518
COMPONENTS FUNCTION
High fluid temperature in transfer unitWhen fluid temperature is high or fluid temperature sensor cir-
cuit is shorted, it flickers twice every second.
It turns OFF when fluid temperature becomes normal.Flickers twice a second.
Other than above (System is normal.) Lamp is OFF. OFFCondition Content 4WD warning lamp
WDIA0164E
Component parts Function
Transfer control unit Controls transfer control device and control valves.
Transfer control device Actuator motor and actuator position switch are integrated so as to switch driving types.
2-4WD shift solenoid valve Controls oil pressure and allows selection between 2WD and 4WD.
Clutch pressure solenoid valve Controls oil pressure and distributes torque (front and rear).
Line pressure switch Detects line pressure.
Clutch pressure switch Detects clutch pressure.
Transfer fluid temperature sen-
sorDetects transfer fluid temperature.
Wait detection switch Detects whether or not 4WD lock gear is locked.
Neutral-4LO switch Detects that transfer is under neutral-4LO condition (or shifting through neutral).
ATP switch Detects that transfer is under neutral condition.
4WD shift switch Allows selection from 2WD, AUTO, 4H or 4LO.
4WD warning lamp• Illuminates if malfunction is detected in electrical system of 4WD system.
• There is 1 blink every 2 seconds if rotation difference of front wheels and rear wheels is large.
• There is 2 blinks every 1 second if high transfer fluid temperature is detected.
AT P w a r n i n g l a m pIndicates that A/T parking mechanism does not operate when A/T selector lever is in “P” position and
transfer is under neutral condition.
4WD shift indicator lamp Displays driving condition selected by 4WD shift switch.
4LO indicator lamp Displays 4LO condition.