2011 INFINITI QX56 service

STR-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006275515
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:0000000006275516
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

STR-4
< PREPARATION >
PREPARATION
PREPARATION
PREPARATION
Special Service ToolsINFOID:0000000006275531
Commercial Service ToolsINFOID:0000000006275532
Tool number
(Kent-Moore No.) Tool name Description
—
(J-44373 Model MCR620)
Starting/Charging System Tester Tests starting and charging systems.
For operating instructio
ns, refer to Technical
Service Bulletin.
SEL403X
Tool name Description
Power tool Loosening bolts, nuts and screws
PIIB1407E
Revision: 2010 May2011 QX56

STR-12
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter motor and alternator test segments must be
done as a set from start to finish.
1.DIAGNOSIS WITH STARTING /CHARGING SYSTEM TESTER
Perform the starting system test with Starting/Char ging System Tester (SST: J-44373). For details and operat-
ing instructions, refer to Technical Service Bulletin.
Te s t r e s u l t
CRANKING VOLTAGE NORMAL>>GO TO 2.
CRANKING VOLTAGE LOW>>GO TO 5.
CHARGE BATTERY>>Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12
hours.) Perform battery test again. Re fer to Technical Service Bulletin.
REPLACE BATTERY>>Before replacing battery, clean t he battery cable clamps and battery posts. Perform
battery test again. Refer to Technical Service Bu lletin. If second test result is “REPLACE BAT-
TERY”, then do so. Perform battery test again to confirm repair.
2.CRANKING CHECK
Check that the starter motor operates correctly.
Does the engine crank normally?
YES >> GO TO 3.
NO >> GO TO 4.
3.ENGINE START CHECK
Check that the engine starts.
Does the engine start?
YES >> Starter motor is OK. INSPECTION END
NO >> Perform further diagnosis of engine mechanical or engine control system. Refer EM and EC sec-
tions. Once resolved, perform battery test again.
4.STARTER MOTOR ACTIVATION
Check that the starter motor operates.
Does the starter motor turn?
YES >> Check ring gear and starter motor drive pinion. Once resolved, perform battery test again.
NO >> GO TO 7.
5.COMPARISON BETWEEN ENGINE COOLANT AND CRANKING VOLTAGE
Compare the engine coolant temperature and the cranking voltage with the specifications.
Minimum Specification of Cranking Voltage Referencing Coolant Temperature
Is the voltage less than the specified value?
YES >> GO TO 7.
NO >> GO TO 6.
6.STARTER OPERATION
Check the starter operation status.
Does the starter motor turn smoothly?
YES >> Starter motor is OK. INSPECTION END
NO >> GO TO 7.
7.“B” TERMINAL CIRCUIT INSPECTION
Check “B” terminal circuit. Refer to STR-14, "
Diagnosis Procedure".
Is
“B” terminal circuit normal?
Engine coolant temperature [ °C ( °F)] Voltage [V]
− 30 to −20 ( −22 to −4) 8.6
− 19 to −10 ( −2 to 14) 9.1
− 9 to 0 (16 to 32) 9.5
More than 1 (More than 34) 9.9
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORKFLOWSTR-13
< BASIC INSPECTION >
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YES >> GO TO 8.
NO >> Repair as needed.
8.“S” CONNECTOR CIRCUIT INSPECTION
Check “S” connector circuit. Refer to STR-15, "
Diagnosis Procedure".
Is
“S” connector circuit normal?
YES >> GO TO 9.
NO >> Repair as needed.
9.ENGINE ROTATION STATUS
Check that the engine can be rotated by hand.
Does the engine turn freely by hand?
YES >> Replace starter motor.
NO >> Perform further diagnosis of engine mechanical or powertrain mechanism. Once resolved, per-
form battery test again. Refer to Technical Service Bulletin.
Revision: 2010 May2011 QX56

STR-20
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Starter MotorINFOID:0000000006275530
Ty p eM001T30671
MITSUBISHI make
Reduction gear type
System voltage [V] 12
No-load Terminal voltage [V] 11
Current [A] Less than 120
Revolution [rpm] More than 3,220
Minimum diameter of commutator [mm. (in)] 28.8 (1.134)
Minimum length of brush [mm. (in)] 10.0 (0.394)
Brush spring tension [N (kg, lb.)] 23.4 – 31.6
(2.4, 5.3 – 3.2, 7.1)
Clearance between bearing metal and armature shaft [mm. (in)] Less than 0.2 (0.008)
Clearance between pinion front edge and pinion stopper [mm. (in)] 0.5 – 2.0 (0.02 – 0.079)
Revision: 2010 May2011 QX56

TM-1
TRANSMISSION & DRIVELINE
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CONTENTS
TRANSAXLE & TRANSMISSION
7AT: RE7R01B
PRECAUTION ................ ...............................
6
PRECAUTIONS .............................................. .....6
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
6
General Precautions .................................................6
Service Notice or Precaution .....................................7
PREPARATION ............................................8
PREPARATION .............................................. .....8
Special Service Tool ........................................... ......8
Commercial Service Tool ..........................................9
SYSTEM DESCRIPTION .............................10
COMPONENT PARTS ................................... ....10
A/T CONTROL SYSTEM ...........................................10
A/T CONTROL SYSTEM : Component Parts Lo-
cation ................................................................... ....
10
A/T CONTROL SYSTEM : Component Descrip-
tion ...................................................................... ....
11
A/T CONTROL SYSTEM : TCM .............................12
A/T CONTROL SYSTEM : Transmission Range
Switch .................................................................. ....
12
A/T CONTROL SYSTEM : Input Speed Sensor .....12
A/T CONTROL SYSTEM : Output Speed Sensor ....12
A/T CONTROL SYSTEM : A/ T Fluid Temperature
Sensor ................................................................. ....
12
A/T CONTROL SYSTEM : Input Clutch Solenoid
Valve ................................................................... ....
12
A/T CONTROL SYSTEM : Front Brake Solenoid
Valve ................................................................... ....
12
A/T CONTROL SYSTEM : Direct Clutch Solenoid
Valve ................................................................... ....
12
A/T CONTROL SYSTEM : High and Low Reverse
Clutch Solenoid Valve ......................................... ....
13
A/T CONTROL SYSTEM : Low Brake Solenoid
Valve .................................................................... ....
13
A/T CONTROL SYSTEM : Anti-interlock Solenoid
Valve ........................................................................
13
A/T CONTROL SYSTEM : 2346 Brake Solenoid
Valve ........................................................................
13
A/T CONTROL SYSTEM : Torque Converter
Clutch Solenoid Valve ......................................... ....
13
A/T CONTROL SYSTEM : Line Pressure Solenoid
Valve .................................................................... ....
13
A/T CONTROL SYSTEM : Accelerator Pedal Po-
sition Sensor ........................................................ ....
13
A/T CONTROL SYSTEM : Manual Mode Switch ....13
A/T CONTROL SYSTEM : To w Mode Switch .........14
A/T CONTROL SYSTEM : A/T CHECK Indicator
Lamp .................................................................... ....
14
A/T CONTROL SYSTEM : Tow Mode Indicator
Lamp .................................................................... ....
14
A/T CONTROL SYSTEM : Selector Lever Position
Indicator ............................................................... ....
14
A/T SHIFT LOCK SYSTEM ................................... ....14
A/T SHIFT LOCK SYSTEM : Component Parts
Location ...................................................................
15
A/T SHIFT LOCK SYSTEM : Component Descrip-
tion ...........................................................................
15
STRUCTURE AND OPERATION .....................16
TRANSMISSION .................................................... ....16
TRANSMISSION : Cross-Sectional View ................16
TRANSMISSION : System Diagram ........................18
TRANSMISSION : System Description ...................18
TRANSMISSION : Component Description .............41
FLUID COOLER & FLUID WARMER SYSTEM .... ....41
FLUID COOLER & FLUID WARMER SYSTEM :
System Description ..................................................
41
SYSTEM ............................................................44
A/T CONTROL SYSTEM ....................................... ....44
Revision: 2010 May2011 QX56

TM-2
A/T CONTROL SYSTEM : System Diagram ..........44
A/T CONTROL SYSTEM : System Description ......44
A/T CONTROL SYSTEM : Fail-Safe ......................45
A/T CONTROL SYSTEM : Protection Control ..... ...47
LINE PRESSURE CONTROL ................................ ...48
LINE PRESSURE CONTROL : System Diagram ...48
LINE PRESSURE CONTROL : System Descrip-
tion ....................................................................... ...
48
SHIFT CHANGE CONTROL .................................. ...49
SHIFT CHANGE CONTROL : System Diagram .....50
SHIFT CHANGE CONTROL : System Description
...
50
SHIFT PATTERN CONTROL ................................. ...53
SHIFT PATTERN CONTROL : System Diagram ...54
SHIFT PATTERN CONTROL : System Descrip-
tion ..........................................................................
54
LOCK-UP CONTROL ............................................. ...56
LOCK-UP CONTROL : System Diagram ................56
LOCK-UP CONTROL : System Description ...........56
A/T SHIFT LOCK SYSTEM .......................................57
A/T SHIFT LOCK SYSTEM : System Description ...58
ON BOARD DIAGNOSTIC (OBD) SYSTEM .....60
Diagnosis Description .......................................... ...60
DIAGNOSIS SYSTEM (TCM) ............................61
CONSULT-III Function (TRANSMISSION) .......... ...61
ECU DIAGNOSIS INFORMATION ..............68
TCM ................................................................. ...68
Reference Value .................................................. ...68
Fail-Safe .................................................................74
Protection Control ...................................................76
DTC Inspection Priority Chart .................................77
DTC Index ..............................................................78
WIRING DIAGRAM .....................................80
A/T CONTROL SYSTEM ................................ ...80
Wiring Diagram .................................................... ...80
A/T SHIFT LOCK SYSTEM ...............................85
Wiring Diagram .................................................... ...85
BASIC INSPECTION ...................................88
DIAGNOSIS AND REPAIR WORK FLOW ..... ...88
Diagnosis Flow .................................................... ...88
Question sheet .......................................................89
ADDITIONAL SERVICE WHEN REPLACING
TRANSMISSION ASSEMBLY ...........................
91
Description ........................................................... ...91
Special Repair Requirement ...................................91
ADDITIONAL SERVICE WHEN REPLACING
CONTROL VALVE & TCM ................................
92
Description ........................................................... ...92
Special Repair Requirement ...................................92
CALIBRATION OF DECEL G SENSOR ...........93
Description ........................................................... ...93
Special Repair Requirement ...................................93
A/T FLUID ..........................................................94
Changing .............................................................. ...94
Adjustment ..............................................................95
A/T FLUID COOLER .........................................97
Cleaning ............................................................... ...97
Inspection ................................................................99
STALL TEST ....................................................100
Inspection and Judgment ..................................... .100
A/T POSITION ..................................................101
Inspection ............................................................. .101
Adjustment ............................................................101
DTC/CIRCUIT DIAGNOSIS .......................102
U0300 CAN COMMUNICATION DATA ......... ..102
Description ........................................................... .102
DTC Logic .............................................................102
Diagnosis Procedure .............................................102
U1000 CAN COMM CIRCUIT ...........................103
Description ........................................................... .103
DTC Logic .............................................................103
Diagnosis Procedure .............................................103
P0615 STARTER RELAY .................................104
Description ........................................................... .104
DTC Logic .............................................................104
Diagnosis Procedure .............................................104
P0705 TRANSMISSION RANGE SWITCH A ..106
DTC Logic .............................................................106
Diagnosis Procedure .............................................106
P0710 TRANSMISSION FLUID TEMPERA-
TURE SENSOR A .............................................
107
DTC Logic ............................................................ .107
Diagnosis Procedure .............................................107
P0717 INPUT SPEED SENSOR A ...................109
DTC Logic ............................................................ .109
Diagnosis Procedure .............................................109
P0720 OUTPUT SPEED SENSOR ...................110
DTC Logic ............................................................ .110
Diagnosis Procedure .............................................110
P0725 ENGINE SPEED ....................................112
Description ........................................................... .112
DTC Logic .............................................................112
Diagnosis Procedure .............................................112
P0729 6GR INCORRECT RATIO .....................114
Revision: 2010 May2011 QX56

TM-5
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Assembly .............................................................
..
284
Inspection ..............................................................286
MID SUN GEAR, REAR SUN GEAR, HIGH
AND LOW REVERSE CLUTCH HUB ..............
287
Exploded View .................................................... ..287
Disassembly ..........................................................287
Assembly ...............................................................289
Inspection ..............................................................291
HIGH AND LOW REVERSE CLUTCH .............292
Exploded View .................................................... ..292
Disassembly ..........................................................292
Assembly ...............................................................293
Inspection ..............................................................293
DIRECT CLUTCH .............................................294
Exploded View .................................................... ..294
Disassembly ..........................................................294
Assembly ............................................................. ..294
Inspection ..............................................................295
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... ...........................................
296
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
296
General Specification .......................................... ..296
Vehicle Speed at Which Gear Shifting Occurs ......296
Vehicle Speed at Which Lock-up Occurs/Releas-
es ...........................................................................
297
Stall Speed ............................................................297
Torque Converter ..................................................297
Total End Play .......................................................298
Reverse Brake Clearance .....................................298
Front Brake Clearance ..........................................298
2346 Brake Clearance ...........................................298
Revision: 2010 May2011 QX56