2011 INFINITI QX56 brake fluid

TM-4
Component Inspection (Shift Lock Solenoid) ........159
SELECTOR LEVER POSITION INDICATOR ..161
Component Function Check ................................ ..161
Diagnosis Procedure .............................................161
Component Inspection (Selector Lever Position
Indicator) ................................................................
163
SYMPTOM DIAGNOSIS ............................165
SYSTEM SYMPTOM ...................................... .165
Symptom Table ................................................... ..165
PERIODIC MAINTENANCE ..................... ..175
A/T FLUID ....................................................... .175
Inspection ............................................................ ..175
REMOVAL AND INSTALLATION ..............176
A/T SHIFT SELECTOR ................................... .176
Exploded View ..................................................... ..176
Removal and Installation .......................................176
Inspection and Adjustment ....................................177
CONTROL CABLE ..........................................178
Exploded View ..................................................... ..178
Removal and Installation .......................................178
Inspection and Adjustment ....................................179
SELECTOR LEVER POSITION INDICATOR ..180
Removal and Installation ..................................... ..180
TOW MODE SWITCH ......................................181
Removal and Installation ..................................... ..181
CONTROL VALVE & TCM ..............................182
Exploded View ..................................................... ..182
Removal and Installation .......................................182
Inspection and Adjustment ....................................186
PARKING COMPONENTS ..............................187
2WD ........................................................................ ..187
2WD : Exploded View ............................................187
2WD : Removal and Installation ............................187
2WD : Inspection ...................................................190
REAR OIL SEAL ..............................................192
2WD ........................................................................ ..192
2WD : Exploded View ............................................192
2WD : Removal and Installation ............................192
2WD : Inspection ...................................................193
4WD ........................................................................ ..193
4WD : Exploded View ............................................193
4WD : Removal and Installation ............................193
4WD : Inspection and Adjustment .........................194
OUTPUT SPEED SENSOR .............................195
2WD ........................................................................ ..195
2WD : Exploded View ...........................................195
2WD : Removal and Installation ............................195
2WD : Inspection and Adjustment .........................198
AIR BREATHER HOSE ....................................199
2WD ........................................................................ .199
2WD : Exploded View ...........................................199
2WD : Removal and Installation ............................199
4WD ........................................................................ .200
4WD : Exploded View ...........................................200
4WD : Removal and Installation ............................200
FLUID COOLER SYSTEM ...............................202
Exploded View ..................................................... .202
Removal and Installation .......................................202
Inspection and Adjustment ....................................204
UNIT REMOVAL AND INSTALLATION ...205
TRANSMISSION ASSEMBLY ..........................205
2WD ........................................................................ .205
2WD : Exploded View ...........................................205
2WD : Removal and Installation ............................205
2WD : Inspection and Adjustment .........................207
4WD ........................................................................ .207
4WD : Exploded View ...........................................208
4WD : Removal and Installation ............................208
4WD : Inspection and Adjustment .........................210
UNIT DISASSEMBLY AND ASSEMBLY ..211
TRANSMISSION ASSEMBLY ..........................211
Exploded View ..................................................... .211
Oil Channel ...........................................................222
Location of Needle Bearings and Bearing Races .222
Location of Snap Rings .........................................225
Disassembly ..........................................................226
Assembly ..............................................................243
Inspection ..............................................................267
OIL PUMP, 2346 BRAKE, FRONT BRAKE
PISTON .............................................................
270
Exploded View ..................................................... .270
Disassembly ..........................................................270
Assembly ..............................................................274
Inspection and Adjustment ....................................277
UNDER DRIVE CARRIER, FRONT BRAKE
HUB ..................................................................
279
Exploded View ..................................................... .279
Disassembly ..........................................................279
Assembly ..............................................................280
Inspection ..............................................................280
FRONT CARRIER, INPUT CLUTCH, REAR
INTERNAL GEAR .............................................
282
Exploded View ..................................................... .282
Disassembly ..........................................................283
Revision: 2010 May2011 QX56

PRECAUTIONSTM-7
< PRECAUTION > [7AT: RE7R01B]
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 Disassembly should be done in a clean work area.
 Use lint-free paper or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the transmission.
 Place disassembled parts in order for easier and proper assembly.
 All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.
 Gaskets, seals and O-rings should be repl aced any time the A/T is disassembled.
 It is very important to perform func tional tests whenever they are indicated.
 The valve body contains precision parts and requires extreme care when parts are removed and serviced.
Place disassembled valve body parts in order for easier and proper assembly. Care will also prevent springs
and small parts from becoming scattered or lost.
 Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.
 Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings and
seals, or hold bearings and washers in place during assembly. Never use grease.
 Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
 When the A/T drain plug is removed, only some of the ATF is drained. Old ATF will remain in torque con- verter and ATF cooling system.
Always follow the procedures under “Changing” when changing ATF. Refer to TM-94, "
Changing".
 Occasionally, the parking gear may be locked with the to rque insufficiently released, when stopping the vehi-
cle by shifting the selector lever from “D” or “R” to “P” position with the brake pedal depressed.
In this case, the shock with a thud caused by the abrupt release of torque may occur when shifting the selec-
tor lever from “P” posit ion to other positions.
However, this symptom is not a malfunction which results in the damage of parts.
Service Notice or PrecautionINFOID:0000000006274263
ATF COOLER SERVICE
If ATF contains frictional material (clutches, bands, etc. ), or if an A/T is repaired, overhauled, or replaced,
inspect and clean the A/T fluid cooler mounted in the radiat or or replace the radiator. Flush cooler lines using
cleaning solvent and compressed air after repair. For A/T fluid cooler cleaning procedure, refer to TM-97,
"Cleaning". For radiator replacement, refer to CO-13, "Exploded View".
Revision: 2010 May2011 QX56

COMPONENT PARTSTM-11
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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NOTE:
The following components are included in the control valve & TCM (17).
TCM
 Input speed sensor 1, 2
 A/T fluid temperature sensor
 Transmission range switch
 Direct clutch solenoid valve
 High and low reverse clutch solenoid valve
 Input clutch solenoid valve
 Front brake solenoid valve
 Low brake solenoid valve
 Anti-interlock solenoid valve
 2346 brake solenoid valve
 Line pressure solenoid valve
 Torque converter clutch solenoid valve
A/T CONTROL SYSTEM : Component DescriptionINFOID:0000000006226739
Name Function
TCM TM-12, "
A/T CONTROL SYSTEM : TCM"
Transmission range switchTM-12, "A/T CONTROL SYSTEM : Transmission Range Switch"
Output speed sensor TM-12, "A/T CONTROL SYSTEM : Output Speed Sensor"
Input speed sensor 1
TM-12, "A/T CONTROL SYSTEM : Input Speed Sensor"Input speed sensor 2
A/T fluid temperature sensorTM-12, "
A/T CONTROL SYSTEM : A/T Fluid Temperature Sensor"
Input clutch solenoid valve TM-12, "A/T CONTROL SYSTEM : Input Clutch Solenoid Valve"
Front brake solenoid valve TM-12, "A/T CONTROL SYSTEM : Front Brake Solenoid Valve"
Direct clutch solenoid valveTM-12, "A/T CONTROL SYSTEM : Direct Clutch Solenoid Valve"
High and low reverse clutch solenoid valveTM-13, "A/T CONTROL SYSTEM : High and Low Reverse Clutch Solenoid Valve"
Low brake solenoid valve TM-13, "A/T CONTROL SYSTEM : Low Brake Solenoid Valve"
Anti-interlock solenoid valve TM-13, "A/T CONTROL SYSTEM : Anti-interlock Solenoid Valve"
2346 brake solenoid valve TM-13, "A/T CONTROL SYSTEM : 2346 Brake Solenoid Valve"
Torque converter clutch solenoid valveTM-13, "A/T CONTROL SYSTEM : Torque Converter Clutch Solenoid Valve"
Line pressure solenoid valve TM-13, "A/T CONTROL SYSTEM : Line Pressure Solenoid Valve"
Accelerator pedal position sensor TM-13, "A/T CONTROL SYSTEM : Accelerator Pedal Position Sensor"
Manual mode switch TM-13, "A/T CONTROL SYSTEM : Manual Mode Switch"
Tow mode switch TM-14, "A/T CONTROL SYSTEM : Tow Mode Switch"
A/T CHECK indicator lampTM-14, "A/T CONTROL SYSTEM : A/T CHECK Indicator Lamp"
Tow mode indicator lamp* TM-14, "A/T CONTROL SYSTEM : Tow Mode Indicator Lamp"
Selector lever position indicator TM-14, "A/T CONTROL SYSTEM : Selector Lever Position Indicator"
Stop lamp switch BRC-15, "Stop Lamp Switch"
Yaw rate/side G sensorBRC-15, "Yaw Rate/Side/Decel G sensor"
Starter relay STR-6, "System Description"
ECMEC-35, "ENGINE CONTROL SYSTEM : System Description"
BCM BCS-6, "BODY CONTROL SYSTEM : System Description"
Combination meter MWI-9, "METER SYSTEM : System Description"
ABS actuator and electric unit (control unit) BRC-16, "System Description"
Revision: 2010 May2011 QX56

TM-12
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
COMPONENT PARTS
A/T CONTROL SYSTEM : TCM
INFOID:0000000006226740
 The TCM consists of a microcomputer and connectors for signal input and output and for power supply. The
TCM controls the A/T.
 The TCM is integral with the control valve assembly and built into the A/T assembly.
A/T CONTROL SYSTEM : Tr ansmission Range SwitchINFOID:0000000006226741
 The transmission range switch incorpor ates four contact switches. Each contact switch transmits an ON/
OFF signal to the TCM.
 The TCM judges a select lever position from a comb ination of ON/OFF signals transmitted from each con-
tact switch.
A/T CONTROL SYSTEM : Input Speed SensorINFOID:0000000006226742
The input speed sensor detects input shaft rpm (revolutions per minute). It is located on the input side of the A/
T. Monitors revolution of sensor 1 and sensor 2 for non-standard conditions.
A/T CONTROL SYSTEM : Output Speed SensorINFOID:0000000006226743
The output speed sensor detects the revolution of t he parking gear and emits a pulse signal. The pulse signal
is transmitted to the TCM which converts it into vehicle speed.
A/T CONTROL SYSTEM : A/T Fluid Temperature SensorINFOID:0000000006226744
The A/T fluid temperature sensor detects the A/T fluid temperature and transmits a signal to the TCM.
A/T CONTROL SYSTEM : Input Clutch Solenoid ValveINFOID:0000000006226745
 The Input clutch solenoid valve is controlled by the TCM in response to signals transmitted from the trans-
mission range switch, output speed sensor and accelerato r pedal position sensor. Gears will then be shifted
to the optimum position.
 The Input clutch solenoid valve controls the input cl utch control valve in response to a signal transmitted
from the TCM.
A/T CONTROL SYSTEM : Front Brake Solenoid ValveINFOID:0000000006226746
 The front brake solenoid valve is controlled by the TC M in response to signals transmitted from the transmis-
sion range switch, output speed sensor and accelerator pedal position sensor. Gears will then be shifted to
the optimum position.
 The front brake solenoid valve controls the front brak e control valve in response to a signal transmitted from
the TCM.
A/T CONTROL SYSTEM : Direc t Clutch Solenoid ValveINFOID:0000000006226747
 The direct clutch solenoid valve is controlled by t he TCM in response to signals transmitted from the trans-
mission range switch, output speed sensor and accelerato r pedal position sensor. Gears will then be shifted
to the optimum position.
 The direct clutch solenoid valve controls the direct clutch control valve in response to a signal transmitted
from the TCM.
Select lever position Transmission range switch
SW1 SW2 SW3 SW4
POFFOFFOFFOFF
RONOFFOFFON
NONONOFFOFF
D and M ONONONON
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-41
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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 Each planetary gear enters the state described below.
Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
TRANSMISSION : Component DescriptionINFOID:0000000006226765
FLUID COOLER & FLUID WARMER SYSTEM
FLUID COOLER & FLUID WARMER SYSTEM : System DescriptionINFOID:0000000006226766
The A/T fluid temperature is controlled to an appropriate level by the A/T fluid cooler and A/T fluid warmer.
Name Front sun gear Front carrier Front internal gear
Condition — Output Input
Direction of rotation Counterclockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Deceleration from front internal
gear Deceleration from front internal
gear Same number of revolution as the
input shaft
Name Under drive sun gear Under drive carrier Under drive internal gear
Condition — Fixed Input/Output
Direction of rotation Counterclockwi se revolution — Clockwise revolution
Number of revolutions Acceleration from under drive inter-
nal gear —Same number of revolution as the
front carrier
Name Rear sun gear Rear carrier Rear internal gear
Condition Output Fixed Input
Direction of rotation Counterclockwi se revolution — Clockwise revolution
Number of revolutions Acceleration from rear internal
gear —Same number of revolution as the
under drive internal gear
Name Mid sun gear Mid carrier Mid internal gear
Condition Input Output Fixed
Direction of rotation Counterclockwise revolution Counterclockwise revolution —
Number of revolutions Same number of revolution as the
rear sun gear Deceleration from mid sun gear —
Name of the Part (Abbreviation) Function
Front brake (FR/B) Fastens the under drive carrier.
Input clutch (I/C) Connects the input shaft, the mid internal gear and the rear carrier.
Direct clutch (D/C) Connects the rear carrier and the rear sun gear.
High and low reverse clutch (HLR/C) Connects the rear sun gear and the mid sun gear.
Reverse brake (R/B) Fastens the rear carrier.
Low brake (L/B) Fastens the mid sun gear.
2346 brake (2346/B) Fastens the under drive sun gear.
1st one-way clutch (1st OWC) Allows the under drive carrier to turn freely in the forward direction but fastens it for reverse
rotation.
2nd one-way clutch (2nd OWC) Allows the rear sun gear to turn freely in the forward direction but fastens it for reverse ro-
tation.
Torque converter Amplifies driving force the engine, and transmits it to transmission input shaft.
Oil pump Driven by the engine, oil pump supplies oil to torque converter, control valve assembly, and
each lubricating system.
Revision: 2010 May2011 QX56

TM-44
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
SYSTEM
A/T CONTROL SYSTEM
A/T CONTROL SYSTEM : System DiagramINFOID:0000000006226767
A/T CONTROL SYSTEM : System DescriptionINFOID:0000000006226768
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
 The A/T senses vehicle operating conditions through vari
ous sensors or signals. It always controls the opti-
mum shift position and reduces shifting and lock-up shocks.
 Receive input signals transmitted from various switches and sensors.
 Determine required line pressure, shifting point, lock-up operation, etc.
JSDIA1853GB
Sensor (or signal)
⇒TCM function
⇒Actuator
Transmission range switch
Accelerator pedal position signal
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Output speed sensor
Vehicle speed signal
Manual mode switch signal
Stop lamp switch signal
Input speed sensor 1, 2
Yaw rate/side/decel G sensor
Tow mode switch signal Line pressure control (
TM-48
)
Shift change control ( TM-50
)
Shift pattern control ( TM-54
)
Lock-up control ( TM-56
)
Fail-safe control ( TM-45
)
Self-diagnosis ( TM-61
)
CONSULT-III communication line ( TM-61
)
CAN communication line ( TM-103
)Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Low brake solenoid valve
Torque converter clutch solenoid valve
Line pressure solenoid valve
Anti-interlock solenoid valve
2346 brake solenoid valve
A/T CHECK indicator lamp
Tow mode indicator lamp
Shift position indicator
Back-up lamp relay
Starter relay
Revision: 2010 May2011 QX56

SYSTEMTM-49
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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When the select operation is performed during driving and the A/T is
shifted down, the line pressure is set according to the vehicle speed.
During Shift Change
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting corresponds to engine
torque and gearshift selection. Also, line pressure characteristic cor-
responds to engine speed, during engine brake operation.
At Low Fluid Temperature
When the A/T fluid temperature drops below the prescribed tempera-
ture, in order to speed up the action of each friction element, the line
pressure is set higher than the normal line pressure characteristic.
SHIFT CHANGE CONTROL
PCIA0009E
PCIA0010E
PCIA0011E
Revision: 2010 May2011 QX56

TM-50
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
SHIFT CHANGE CONTROL : System Diagram
INFOID:0000000006226773
SHIFT CHANGE CONTROL : System DescriptionINFOID:0000000006226774
Input/Output Signal Chart
Item Signal TCM function Actuator
Input speed sensor 1, 2 Input speed
Shift change control High and low reverse
clutch solenoid valve
 Direct clutch solenoid
valve
 Input clutch solenoid valve
 Low brake solenoid valve
 2346 brake solenoid valve
 Front brake solenoid valve
 Torque converter clutch so- lenoid valve
 Line pressure solenoid valve
 Anti-interlock solenoid valve
Output speed sensor Vehicle speed
A/T fluid temperature sensor ATF temperature
ECM
Engine speed signal*
Accelerator pedal position signal*
Closed throttle position signal*
Engine and A/T integrated control signal
(Engine torque)*
BCM Stop lamp switch signal*
JSDIA1659GB
Revision: 2010 May2011 QX56