2011 INFINITI QX56 lock

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TRANSMISSION & DRIVELINE
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CONTENTS
DRIVELINE
TRANSFER: ATX90A
PRECAUTION ................ ...............................
6
PRECAUTIONS .............................................. .....6
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
6
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
6
Service Notice or Precautions for Transfer ...............7
PREPARATION ............................................8
PREPARATION .............................................. .....8
Special Service Tools .......................................... ......8
Commercial Service Tools ........................................8
SYSTEM DESCRIPTION .............................10
COMPONENT PARTS ................................... ....10
Component Parts Location .................................. ....10
Component Description ...........................................11
Transfer Control Unit ...............................................11
Transfer Control Actuator ........................................11
Transfer Hi-Lo Position Sensor ...............................12
Transfer Rotary Position Sensor .............................12
Transfer Lock Position Sensor ................................12
Transfer Fluid Temperature Sensor ........................12
STRUCTURE AND OPERATION .......................13
Sectional View ..................................................... ....13
Torque Split Mechanism .........................................13
SYSTEM .............................................................18
4WD SYSTEM ...........................................................18
4WD SYSTEM : System De scription ......................18
4WD SYSTEM : Fail-Safe ......................... ..............20
DIAGNOSIS SYSTEM (TRANSFER CON-
TROL UNIT) .................................................... ....
21
CONSULT-III Function ........................................ ....21
ECU DIAGNOSIS INFORMATION ..............24
TRANSFER CONTROL UNIT ...........................24
Reference Value .................................................. ....24
Fail-Safe ..................................................................28
DTC Inspection Priority Chart ..................................29
DTC Index ...............................................................29
WIRING DIAGRAM ......................................31
4WD SYSTEM .. ................................ .................31
Wiring Diagram .................................................... ....31
BASIC INSPECTION ...................................38
DIAGNOSIS AND REPAIR WORK FLOW .......38
Work Flow ............................................................ ....38
Diagnostic Work Sheet ............................................39
ADDITIONAL SERVICE WHEN REPLACING
TRANSFER CONTROL UNIT ...........................
41
Description ...............................................................41
Work Procedure .......................................................41
ADDITIONAL SERVICE WHEN REPLACING
TRANSFER ASSEMBLY ..................................
42
Description ...............................................................42
Work Procedure .......................................................42
TRANSFER LOCK POSITION SENSOR
LEARNING ....................................... .................
44
Description ........................................................... ....44
Work Procedure .......................................................44
TRANSFER ROTARY POSITION SENSOR
LEARNING ....................................... .................
46
Description ........................................................... ....46
Work Procedure .......................................................46
TRANSFER FLUID VISCOSITY LEARNING ....47
Description ...............................................................47
Revision: 2010 May2011 QX56

DLN-2
Work Procedure ......................................................47
CONFIGURATION (TRANSFER CONTROL
UNIT) ..................................................................
48
Description ........................................................... ...48
Work Procedure ......................................................48
DTC/CIRCUIT DIAGNOSIS ...................... ...51
P1802, P1803, P1804, P1809 TRANSFER
CONTROL UNIT ............................................. ...
51
DTC Logic ............................................................ ...51
Diagnosis Procedure ..............................................51
P1807 OUT PUT SHAFT SPEED SENSOR ......52
DTC Logic ............................................................ ...52
Diagnosis Procedure ..............................................52
P1808 WHEEL SPEED SENSOR ......................53
DTC Logic ............................................................ ...53
Diagnosis Procedure ..............................................53
P180C SENSOR POWER SUPPLY (5V) ..........54
Description ........................................................... ...54
DTC Logic ...............................................................54
Diagnosis Procedure ..............................................54
P180D TRANSFER ROTARY POSITION
SENSOR ............................................................
57
DTC Logic ............................................................ ...57
Diagnosis Procedure ..............................................57
P180E SENSOR POWER SUPPLY (8V) ...........59
Description ........................................................... ...59
DTC Logic ...............................................................59
Diagnosis Procedure ..............................................59
P180F TRANSFER INTERNAL SPEED SEN-
SOR ....................................................................
61
DTC Logic ............................................................ ...61
Diagnosis Procedure ..............................................61
P1811 POWER SUPPLY CIRCUIT FOR
TRANSFER CONTROL UNIT ............................
64
Description ........................................................... ...64
DTC Logic ...............................................................64
Diagnosis Procedure ..............................................64
P1813 4WD MODE SWITCH .............................67
DTC Logic ............................................................ ...67
Diagnosis Procedure ..............................................67
Component Inspection ............................................68
P1816 PARKING/NEUTRAL POSITION
SWITCH .............................................................
69
DTC Logic ............................................................ ...69
Diagnosis Procedure ..............................................69
P1817 TRANSFER MOTOR ..............................70
DTC Logic ............................................................ ...70
Diagnosis Procedure ..............................................70
Component Inspection ......................................... ...71
P181A TRANSFER MOTOR TEMPERATURE
SENSOR ............................................................
72
DTC Logic ............................................................ ...72
Diagnosis Procedure ...............................................72
Component Inspection ............................................73
P181B INCOMPLETE SELFSHUT ....................74
DTC Logic ............................................................ ...74
Diagnosis Procedure ...............................................74
P181C TRANSFER MOTOR POWER SUP-
PLY ....................................................................
76
Description ........................................................... ...76
DTC Logic ...............................................................76
Diagnosis Procedure ...............................................76
P181E STEERING ANGLE SENSOR ...............77
DTC Logic ............................................................ ...77
Diagnosis Procedure ...............................................77
P181F INCOMPLETE CALIBRATION ..............78
DTC Logic ............................................................ ...78
Diagnosis Procedure ...............................................78
P1820 ENGINE SPEED SIGNAL ......................79
DTC Logic ............................................................ ...79
Diagnosis Procedure ...............................................79
P1826 TRANSFER FLUID TEMPERATURE ....80
DTC Logic ............................................................ ...80
Diagnosis Procedure ...............................................80
Component Inspection ............................................81
P1829 ACCELERATOR PEDAL POSITION
SENSOR ............................................................
82
DTC Logic ............................................................ ...82
Diagnosis Procedure ...............................................82
P182A TRANSFER HI-LO POSITION SEN-
SOR ...................................................................
83
DTC Logic ............................................................ ...83
Diagnosis Procedure ...............................................83
P182B TRANSFER LOCK POSITION SEN-
SOR ...................................................................
85
DTC Logic ............................................................ ...85
Diagnosis Procedure ...............................................85
P1830 ABS OPERATION SIGNAL ...................88
DTC Logic ............................................................ ...88
Diagnosis Procedure ...............................................88
P1831 VDC OPERATION SIGNAL ...................89
DTC Logic ............................................................ ...89
Diagnosis Procedure ...............................................89
P1832 TCS OPERATION SIGNAL ....................90
DTC Logic ............................................................ ...90
Diagnosis Procedure ...............................................90
Revision: 2010 May2011 QX56

DLN-3
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U1000 CAN COMM CIRCUIT ......................... ....91
Description .......................................................... ....91
DTC Logic ...............................................................91
Diagnosis Procedure ...............................................91
U1010 CONTROL UNIT (CAN) ..........................92
Description .......................................................... ....92
DTC Logic ...............................................................92
Diagnosis Procedure ...............................................92
POWER SUPPLY AND GROUND CIRCUIT ......93
Description .......................................................... ....93
Diagnosis Procedure ...............................................93
4WD WARNING LAMP ......................................97
Component Function Check ................................ ....97
Diagnosis Procedure ...............................................97
4WD INDICATOR LAMP ....................................98
Component Function Check ................................ ....98
Diagnosis Procedure ...............................................98
SYMPTOM DIAGNOSIS ..............................99
HEAVY TIGHT-CORNER BRAKING SYMP-
TOM OCCURS . .............................................. ....
99
Description .......................................................... ....99
Diagnosis Procedure ...............................................99
4WD MODE DOES NOT CHANGE ..................100
Description .......................................................... ..100
Diagnosis Procedure .............................................100
4WD MODE INDICATOR LAMP CONTINUES
BLINKING .........................................................
101
Description .......................................................... ..101
Diagnosis Procedure .............................................101
4WD WARNING LAMP BLINKS QUICKLY .....102
Description .......................................................... ..102
4WD WARNING LAMP BLINKS SLOWLY .....103
Description .......................................................... ..103
Diagnosis Procedure .............................................103
INFORMATION DISPLAY IS NOT DIS-
PLAYED ...........................................................
104
Description .......................................................... ..104
Diagnosis Procedure .............................................104
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ..........................
105
NVH Troubleshooting Chart ................................ ..105
PERIODIC MAINTENANCE .......................106
TRANSFER FLUID ......................................... ..106
Inspection ............................................................ ..106
Draining .................................................................106
Refilling .................................................................106
REMOVAL AND INSTALLATION .............107
TRANSFER CONTROL UNIT .........................107
Removal and Installation ..................................... ..107
4WD MODE SWITCH ......................................108
Removal and Installation .......................................108
FRONT OIL SEAL ...........................................109
Exploded View .......................................................109
Removal and Installation .......................................109
REAR OIL SEAL .............................................111
Exploded View .......................................................111
Removal and Installation .......................................111
Adjustment .............................................................112
TRANSFER CONTROL ACTUATOR .............114
Exploded View .......................................................114
Removal and Installation .......................................114
Inspection ..............................................................114
TRANSFER HI-LO POSITION SENSOR ........116
Exploded View .......................................................116
Removal and Installation .......................................116
Inspection ..............................................................116
TRANSFER ROTARY POSITION SENSOR ...117
Exploded View .......................................................117
Removal and Installation .......................................117
Inspection ..............................................................118
TRANSFER LOCK POSITION SENSOR ........119
Exploded View .......................................................119
Removal and Installation .......................................119
Inspection ..............................................................119
TRANSFER FLUID TEMPERATURE SEN-
SOR .................................................................
120
Exploded View .......................................................120
Removal and Installation .......................................120
Inspection ..............................................................120
UNIT REMOVAL AND INSTALLATION ....121
TRANSFER ASSEMBLY ................................121
Exploded View ..................................................... ..121
Removal and Installation .......................................121
INPUT OIL SEAL ............................................123
Exploded View .......................................................123
Removal and Installation .......................................123
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... ...........................................
124
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
124
General Specifications ......................................... ..124
FRONT PROPELLER SHAFT: 2F P15
PREPARATION ........ .................................
125
PREPARATION ...............................................125
Revision: 2010 May2011 QX56

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< PRECAUTION >[TRANSFER: ATX90A]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006222209
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty 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 w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation after Battery Disconnect
INFOID:0000000006222210
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect bot h battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the bat tery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wi ll remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
Revision: 2010 May2011 QX56

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

DLN-10
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006222214
1. ECM
Refer to EC-16, "
Component Parts
Location". 2. ABS actuator and electric unit (con-
trol unit)
Refer to BRC-10, "Component Parts
Location". 3. Steering angle sensor
Refer to BRC-10, "
Component Parts
Location".
4. Control valve & TCM Refer to TM-10, "
A/T CONTROL
SYSTEM : Compon ent Parts Loca-
tion". 5. Transfer control unit 6. 4WD switch assembly
7. Transfer lock position sensor 8. Transfer Hi-Lo position sensor 9. Transfer rotary position sensor
10. Transfer control actuator 11. Transfer fluid temperature sensor
A. Back of glove box assembly B. 4WD indicator lamp, 4WD warning lamp, ATP warning lamp (in combina-
tion meter)C. Console assembly
D. Transfer assembly upper side E. Transfer assembly under side
JPDIE0270GB
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

DLN-12
< SYSTEM DESCRIPTION >[TRANSFER: ATX90A]
COMPONENT PARTS
 This sensor uses a thermistor and its electrical resi
stance varies as the temperature varies. The electrical
resistance decreases as the temperature increases.
Transfer Hi-Lo Position SensorINFOID:0000000006222218
Transfer Hi-Lo position sensor detects engagement status of Hi-Lo sleeve and transmits signal to transfer con-
trol unit.
Transfer Rotary Position SensorINFOID:0000000006222219
Transfer rotary position sensor detects rotation status of actuator shaft and transmits signal to transfer control
unit.
Transfer Lock Position SensorINFOID:0000000006222220
Transfer lock position sensor detects engagement status of lock sleeve and transmits signal to transfer control
unit.
Transfer Fluid Temperature SensorINFOID:0000000006222221
 Transfer fluid temperature sensor m easures temperature of transfer fluid.
 This sensor uses a thermistor and its electrical resi stance varies as the temperature varies. The electrical
resistance decreases as the temperature increases.
Revision: 2010 May2011 QX56