torque INFINITI QX56 2011 Factory Workshop Manual

PRECAUTIONSDLN-7
< PRECAUTION > [TRANSFER: ATX90A]
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5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of a ll control units using CONSULT-III.
Service Notice or Precautions for TransferINFOID:0000000006222211
CAUTION:
 Use Genuine NISSAN Transfer Fluid. Refer to MA-10, "
Fluids and Lubricants".
 Never reuse transfer fluid, once it has been drained.
 Check the fluid level or repl ace the fluid only with the vehicle parked on level ground.
 During removal or installati on, keep inside of transfer clear of dust or dirt.
 Replace all tires at the same time. Always use tir es of the proper size and the same brand and pat-
tern. Fitting improper size and unusually worn tires applies excessive force to vehicle mechanism
and can cause longitudinal vibration.
 Disassembly should be done in a clean work area, it is preferable to work in dustproof area.
 Before proceeding with disassembly, thoroughly clean the transfer. It is important to prevent the
internal parts from becoming contamin ated by dirt or other foreign matter.
 All parts should be carefully cl eaned with a general purpose, non-flammable solvent before inspec-
tion or reassembly.
 Check for the correct installation status prior to removal or disassembly. If matching marks are
required, be certain they do not interfere wit h the function of the parts when applied.
 Check appearance of the disassembled parts for damage, deformation, and unusual wear. Replace
them with a new ones if necessary.
 Gaskets, seals and O-rings should be replaced any time the transfer is disassembled.
 In principle, tighten bolts or nu ts gradually in several steps workin g diagonally from inside to out-
side. If tightening sequence is specified, use it.
 Observe the specified torque when assembling.
 Clean and flush the parts su fficiently and blow-dry them.
 Be careful not to damage sliding surfaces and mating surfaces.
 Clean inner parts with lint-free cloth or towels . Do not use cotton work gloves and rags to prevent
adhering fibers.
Revision: 2010 May2011 QX56

COMPONENT PARTSDLN-11
< SYSTEM DESCRIPTION > [TRANSFER: ATX90A]
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Component DescriptionINFOID:0000000006222215
Transfer Control UnitINFOID:0000000006222216
 Transfer control unit operates transfer control act uator, 4WD warning lamp and 4WD mode indicator lamp
according to input signal from 4WD shift switch and each sensor and control unit.
 When 4WD system is malfunctioning, 4WD warning la mp turns ON and fail-safe status activates.
 When protection is necessary, 4WD warning la mp blinks and protection status activates.
Transfer Control ActuatorINFOID:0000000006222217
Transfer control actuator integrates transfer motor, transfer internal position sensor, and transfer motor tem-
perature sensor, and switches 4WD mode (AUTO ⇔4H ⇔4L).
TRANSFER MOTOR
Transfer motor operates according to signal from transfer control unit and switches 4WD mode
(AUTO ⇔4H ⇔4L). It also performs front and rear distri bution of traction force during AUTO mode.
TRANSFER INTERNAL SPEED SENSOR
Transfer internal speed sensor detects rotation status of transfer motor and transmits signal to transfer control
unit.
TRANSFER MOTOR TEMPERATURE SENSOR
 Transfer motor temperature sensor m easures temperature of transfer motor.
Component parts Reference/Function
Transfer control unit DLN-11, "
Transfer Control Unit"
Transfer control actua-
torTransfer motor
DLN-11, "
Transfer Control Actuator"
Transfer internal speed
sensorDLN-11, "Transfer Control Actuator"
Transfer motor temper-
ature sensor
DLN-11, "Transfer Control Actuator"
Transfer Hi-Lo position sensor
DLN-12, "Transfer Hi-Lo Position Sensor"
Transfer rotary position sensorDLN-12, "Transfer Rotary Position Sensor"
Transfer lock position sensorDLN-12, "Transfer Lock Position Sensor"
Transfer fluid temperature sensorDLN-12, "Transfer Fluid Temperature Sensor"
4WD mode switchDLN-18, "4WD SYSTEM : System Description"
4WD indicator lampDLN-18, "4WD SYSTEM : System Description"
4WD warning lampDLN-18, "4WD SYSTEM : System Description"
AT P w a r n i n g l a m pDLN-18, "4WD SYSTEM : System Description"
ABS actuator and electric unit (control unit)Transmits the following signals via CAN communication line to transfer control unit.
 Vehicle speed signal (ABS)
 Stop lamp switch signal (brake signal)
 ABS operation signal
 VDC operation signal
 TCS operation signal
Steering angle sensor Transmits the following signals via CAN communication line to transfer control unit.
 Steering angle sensor signal
ECM Transmits the following signals via CAN communication line to transfer control unit.
 Accelerator pedal position signal
 Engine speed signal
 Engine torque signal
TCM Transmits the following signals via CAN communication line to transfer control unit.
 Shift position signal
 Gear position signal
 Output shaft revolution signal
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONDLN-13
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STRUCTURE AND OPERATION
Sectional ViewINFOID:0000000006222222
Torque Split MechanismINFOID:0000000006222223
CONTROL DIAGRAM
1. Rear companion flange 2. Main shaft 3. Rear case
4. Ball ramp lever 5. Ball lamp lever 6. Piston
7. Clutch 8. Sprocket 9. Lock sleeve
10. Hi-Lo sleeve 11. Sun gear 12. Front case
13. Planetary carrier assembly 14. Internal gear 15. Shift fork
16. Transfer rotary position sensor 17. Front shaft flange 18. Drive chain
19. Actuator shaft 20. Cam 21. Transfer control actuator
JPDIE0277ZZ
Revision: 2010 May2011 QX56

DLN-14
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
STRUCTURE AND OPERATION
DESCRIPTION
 Ball ramp lever operates in the direction of main shaft axis according to rotation of actuator shaft and
presses piston. Pressure is applied to each clutch and torque is transmitted.
 Shift fork operates in the direction of main shaft axis according to rotation of actuator shaft and performs
engagement and disengagement to Hi-Lo sleeve and lock sleev e of main shaft. Mode is switched between
4H ⇔4L.
AUTO MODE
 The optimum torque distribution is electronically performed for front and rear wheels according to road con-
ditions.
 Stable start without wheel spin is possible on slippery road conditions, such as on a snowy road.
 When road condition does not require 4WD driving, the st atus becomes close to rear wheel drive, which
results in better fuel efficiency and prov ides FR-like steering characteristics.
 The vehicle cornering status is judged according to information from each sensor, and the optimum torque is
distributed to front wheels for prev enting tight-corner braking symptom.
NOTE:
When there is a difference of revolution speed between the front and rear wheel the shift occasionally changes
to direct 4-wheel driving conditions aut omatically. This is not a malfunction.
4H MODE
 Torque distribution for front and rear wheels is fixed and stable start is achieved while driving on an rough,
sandy or snowy road.
4L MODE
 Large traction force is obtained due to low gear. High running ability and escaping ability are achieved.
 Switching from 4H mode to 4L mode is not possible w hen the vehicle is not stopped and A/T shift selector is
not in the neutral position.
TORQUE DISTRIBUTION DIAGRAM
JPDIE0256GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONDLN-15
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TORQUE DISTRIBUTION FLOW
OPERATION PRINCIPLE
AUTO, 4H MODE
1. Main shaft 2. Clutch 3. Sprocket
4. Lock sleeve 5. Hi-Lo sleeve 6. Sun gear
7. Planetary carrier assembly 8. Front shaft flange 9. Drive chain
JPDIE0271GB
JPDIE0257GB
Revision: 2010 May2011 QX56

DLN-16
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
STRUCTURE AND OPERATION
1. Transfer control unit supplies command current to transfer motor.
2. Transfer motor operates and actuator shaft rotates clockwise.
3. Shift fork operates according to rotation of actuator shaft. Sun gear and Hi-Lo sleeve are engaged.
4. Ball ramp lever operates in axial direction via cam fixed on actuator shaft according to traction torque of
transfer motor, presses piston, and thrusts multiple plate clutch.
5. Torque is transmitted to front wheels according to thrusting pressure of multiple plate clutch. NOTE:
Torque transmitted to the front wheel is determined according to the command current.
4L MODE
1. Main shaft 2. Ball lamp lever 3. Piston
4. Clutch 5. Hi-Lo sleeve 6. Sun gear
7. Shift fork 8. Actuator shaft 9. Transfer control actuator
JPDIE0278GB
Revision: 2010 May2011 QX56

DLN-18
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
SYSTEM
SYSTEM
4WD SYSTEM
4WD SYSTEM : System DescriptionINFOID:0000000006222224
 In AUTO mode, distribution of traction force is cont
rolled from 2WD status (0:100) to 4WD status (50:50)
according to signal from each sensor and switch.
 In accordance with fail-safe function, when system is malfunctioning, 4WD warning lamp on combination meter turns ON and 4WD control stops. For fail-safe function, refer to DLN-20, "
4WD SYSTEM : Fail-Safe".
 When a high load status continues for transfer assembly (transfer control actuator or transfer fluid), 4WD
control temporarily becomes 4H or 2WD status, according to protection function.
NOTE:
4WD system is not malfunctioning.
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
It transmits/receives each signal from the followi ng transfer control unit via CAN communication line.
JPDIE0272GB
Component parts Control signal
ABS actuator and electric unit (control unit) Transmits the following signals via CAN communication line to transfer control unit.
 Vehicle spee
d signal (ABS)
 Stop lamp switch signal (brake signal)
 ABS operation signal
 VDC operation signal
 TCS operation signal
ECM Transmits the following signals via CAN communication line to transfer control unit.
 Accelerator pedal position signal
 Engine speed signal
 Engine torque signal
Revision: 2010 May2011 QX56

DLN-20
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
SYSTEM
4WD Warning Lamp
 Turns ON when there is a malfunction in 4WD system. 4W
D warning lamp indicates the vehicle is in fail-safe
mode.
 Also turns ON when ignition switch is turned ON, fo r the purpose of lamp check. Turns OFF approximately
for 1 second after the engine starts if system is normal.
ATP Warning Lamp
When the A/T shift selector is in P position, the vehicle may move if the transfer case in neutral. ATP warning
lamp is turned on to indicate this condition to the driver.
CONDITION FOR OPERATE WARNING BUZZER
For preventing an incorrect operation during 4H ⇔4L switching, warning buzzer sounds from inside of transfer
control unit and warns the driver, when certain conditions are satisfied.
4WD SYSTEM : Fail-SafeINFOID:0000000006303692
 If any malfunction occurs in 4WD electrical system, and control unit detects the malfunction, 4WD warning
lamp on combination meter turns ON to indicate system malfunction.
 When 4WD warning lamp is ON, vehicle changes to rear-wheel drive or shifts to 4-wheel drive (front-wheels
still have some driving torque).
Condition 4WD warning lamp
Lamp check Turns ON when ignition switch is turned ON. Turns OFF ap-
prox. 1 second after the engine start.
4WD system malfunction ON
Protection function is activated due to heavy load to transfer assem-
bly. (4WD system is not malfunctioning.) Quick blinking: 2 times/second
(Blinking in approx. 1 minute and then turning OFF)
Large difference in diameter of front/rear tires Slow blinking: 1 time/2 seconds
(Continuing to blink until turning ignition switch OFF)
Other than above (system normal) OFF
Condition Warning buzzer
4WD shift status A/T shift selector Engine speed
4H⇔4L N range 350
− 1.600 rpm OFF
Under 350 rpm or over 1.600 rpm ON
Except N range Always
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)
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WORK SUPPORT
*: “LOCK SLEEVE SENSOR” means transfer lock position sensor.
VHCL/S SEN-RR [km/h] X Wheel speed (rear) average calculated by
transfer control.
ENG SPEED [rpm] X Engine status via CAN communication line is
displayed.
INTERNL SPEED SEN [count] X Transfer internal speed sensor status is dis-
played.
TRANSFER TORQUE [Nm] X Commanded transfer communication torque is
displayed.
UNIT PARAMETER [A1 - A9, B1 - B9, C1 - C9, D1
- D9, E1 - E9, F1 - F9, G1 - G9, H1 - H9, J1 - J9] Unit parameter of transfer recognized by trans-
fer control unit is displayed.
Monitor item (Unit)
SELECT MONITOR ITEM
Remarks
ECU INPUT
SIGNALS MAIN SIG-
NALS
Function Description
UNIT CHARACTERISTIC WRITE Writes the unit parameter of transfer to transfer control unit.
START CALIBRATION Perform initial calibration of transfer control unit.
LOCK SLEEVE SENSOR
* INITIALIZE Format learning the transfer lock position sensor written to transfer control unit.
LOCK SLEEVE SENSOR
* LEARNING Perform learning the transfer lock position sensor.
OIL DETERIORATION INFO RESET Format the transfer fl uid viscosity written to transfer control unit.
Revision: 2010 May2011 QX56

DLN-26
< ECU DIAGNOSIS INFORMATION >[TRANSFER: ATX90A]
TRANSFER CONTROL UNIT
*1: 4WD shift swich (2WD) is not equipped, but it is displayed.
*2: This indicator is not equipped, but it is displayed.
*3: This switch is not equipped, but it is displayed.
TERMINAL LAYOUT
PHYSICAL VALUES
COMPR VHCL SPEEDVehicle stopped 0.00 km/h (0.00 mph)
Vehicle driving
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (inside of ±10
%)
VHCL/S SEN-FR Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle driving
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (inside of ±10
%)
VHCL/S SEN-RR Vehicle stopped 0.00 km/h
Vehicle driving
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (inside of ±10
%)
ENGINE SPEED Engine running Approx. equal to the indication
on tachometer (inside of ±10 %)
INTRNL SPEED SEN 4WD mode: AUTO
A/T shift selector: DDepress the accelerator pedal several
times.
Value is changing
TRANSFER TORQUE 4WD shift switch: AUTO 0 - 2250 N·m
4WD shift switch: 4H 0 - 2250 N·m
4WD shift switch: 4L 0 Nm
UNIT PARAMETER Always A1 - A9
B1 - B9
C1 - C9
D1 - D9
E1 - E9F1 - F9
G1 - G9 H1 - H9 J1 - J9
Monitor item Condition Value/Status
JPDIE0229ZZ
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
+ - Signal name Input/
Output
6
(BR) Ground Hi-Lo position sensor 1 Input/
Output Engine run-
ning
(Never
drive the
vehicle.) 4WD mode: AUTO or 4H 0 V
4WD mode: Shifting 0 V
4WD mode: 4L 5 V
Revision: 2010 May2011 QX56