INFINITI QX56 2011 Factory Service Manual

COMPONENT PARTSTM-13
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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A/T CONTROL SYSTEM : High and Lo w Reverse Clutch Solenoid ValveINFOID:0000000006226748
 The high and low reverse clutch solenoid valve is controlled by the TCM in response to signals transmitted
from the transmission range switch, output speed sens or and accelerator pedal position sensor. Gears will
then be shifted to the optimum position.
 The high and low reverse clutch solenoid valve controls the high and low reverse clutch control valve in response to a signal transmitted from the TCM.
A/T CONTROL SYSTEM : Lo w Brake Solenoid ValveINFOID:0000000006226749
 The low 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 low brake solenoid valve controls the low brake control valve in response to a signal transmitted from
the TCM.
A/T CONTROL SYSTEM : Anti-interlock Solenoid ValveINFOID:0000000006226750
 Anti-interlock solenoid valve prevents the simultaneous activation of the input clutch and the low brake.
 The anti-interlock solenoid valve is an ON/OFF type solenoid valve.
A/T CONTROL SYSTEM : 2 346 Brake Solenoid ValveINFOID:0000000006226751
 The 2346 brake solenoid valve is controlled by the TC M in response to signals transmitted from the trans-
mission range switch, output speed sensor and accelera tor pedal position sensor. Gears will then be shifted
to the optimum position.
 The 2346 brake solenoid valve controls the 2346 brake c ontrol valve in response to a signal transmitted from
the TCM.
A/T CONTROL SYSTEM : Torque Co nverter Clutch Solenoid ValveINFOID:0000000006226752
The torque converter clutch solenoid va lve is activated, with the gear in D2, D3, D4, D5, D6, D7, M2, M3, M4,
M5, M6 and M7 by the TCM in response to signals tr ansmitted from the output speed sensor and accelerator
pedal position sensor. Torque converter clut ch piston operation will then be controlled.
A/T CONTROL SYSTEM : Line Pressure Solenoid ValveINFOID:0000000006226753
The line pressure solenoid valve regulates the oil pum p discharge pressure to suit the driving condition in
response to a signal transmitted from the TCM.
A/T CONTROL SYSTEM : Accele rator Pedal Position SensorINFOID:0000000006226754
 The accelerator pedal position sensor is installed on the upper end of the accelerator pedal assembly.
 The accelerator pedal position sensor detects the accelerator position.
 The accelerator pedal position sensor transform the a ccelerator pedal position into output voltage, and emit
the voltage signal to the ECM. Then, the TCM receives accelerator pedal position signal from the ECM via
CAN communication.
A/T CONTROL SYSTEM : Manual Mode SwitchINFOID:0000000006226755
 The manual mode switch [mode select switch and position se lect switch (shift-up/shift-down)] is installed in
the A/T shift selector assembly.
 The mode select switch detects the position (the main shift gate side or manual shift gate side) of the selec-
tor lever and transmits a manual mode signal or a not manual mode signal to the combination meter. Then,
the TCM receives a manual mode signal or non-manual mode signal from the combination meter.
 The position select switch (shift-up) detects that the se lector lever is shifted to the shift-up side of the manual
shift gate and transmits a manual mode shift up signal to the combination meter. Then, the TCM receives a
manual mode shift up signal from the combination meter.
 The position select switch (shift-down) detects that the selector lever is shifted to the shift-down side of the
manual shift gate and transmits a manual mode shift down signal to the combination meter. Then, the TCM
receives a manual mode shift down signal from the combination meter.
Revision: 2010 May2011 QX56

TM-14
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
COMPONENT PARTS
A/T CONTROL SYSTEM : Tow Mode Switch
INFOID:0000000006226756
 Tow mode switch is integrated in to
 Tow mode switch is integrated in to SNOW MODE /TOW MODE/VDC OFF switch assembly (2WD models)
or 4WD switch assembly (4WD models).
 When tow mode switch is pressed while tow mode indicator lamp on combination meter is OFF, the tow mode turns ON and tow mode indicator lamp turns ON.
 When tow mode switch is pressed while tow mode indicator lamp on combination meter is ON, the tow mode
turns OFF and tow mode indicator lamp turns OFF.
A/T CONTROL SYSTEM : A/ T CHECK Indicator LampINFOID:0000000006226757
A/T CHECK INDICATOR LAMP
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
A/T CONTROL SYSTEM : Tow Mode Indicator LampINFOID:0000000006226758
TOW MODE INDICATOR LAMP
Turns ON when tow mode is switched to operational status (ON) by tow mode switch.
A/T CONTROL SYSTEM : Selector Lever Position IndicatorINFOID:0000000006226759
Indicates selector lever position.
A/T SHIFT LOCK SYSTEM
Condition (status) A/T CHECK indicator lamp
Ignition switch OFF OFF
For approx. 2 seconds after the ignition switch is turned ON ON
Approx. 2 seconds after ignition switch is turned ON OFF
A/T is malfunctioning OFF
Condition (status) Tow mode indicator lamp
Ignition switch OFF OFF
When ignition switch turns ON OFF
Press tow mode switch while tow mode indicator lamp is OFF. ON
Press tow mode switch while tow mode indicator lamp is ON. OFF
Revision: 2010 May2011 QX56

COMPONENT PARTSTM-15
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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A/T SHIFT LOCK SYSTEM : Component Parts LocationINFOID:0000000006226760
A/T SHIFT LOCK SYSTEM : Component DescriptionINFOID:0000000006226761
1. Stop lamp switch
Refer to BRC-10, "
Component Parts
Location". 2. Shift lock cover * 3. Shift lock solenoid
4. Park position switch
A. Center console B. A/T shift selector assembly
*: Shift lock release button becomes operative by removing shift lock cover.
JSDIA1695GB
Component Function
Shift lock solenoid It operates according to the signal from the stop lamp switch and moves the lock lever.
Lock lever It moves according to the operation of the shift lock solenoid and performs the release of
the shift lock.
Detent rod It links with the selector button and restricts the selector lever movement.
Park position switch It detects that the selector lever is in “P” position.
Shift lock release button It moves the lock lever forcibly.
Revision: 2010 May2011 QX56

TM-16
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
STRUCTURE AND OPERATION
TRANSMISSION
TRANSMISSION : Cross-Sectional ViewINFOID:0000000006226762
2WD MODELS
4WD MODELS
1. Low brake 2. Drum support 3. Reverse brake
4. Direct clutch 5. High and low reverse clutch 6. 2nd one-way clutch
7.
*1Rear carrier 8. Mid carrier 9. Input clutch
10.
*2Front sun gear 11 .*3Front carrier 12. Under drive carrier
13. 1st one-way clutch 14. Front brake 15. 2346 brake
16.
*4Input shaft 17. Torque converter 18. Oil pump
19.
*2Under drive sun gear 20.*3Under drive internal gear21.*4Front internal gear
22. Mid sun gear 23.
*1Mid internal gear 24. Rear sun gear
25. Rear internal gear 26. High and low reverse clutch hub 27. Control valve & TCM
28. Parking gear 29. Adapter case 30. Output shaft
*1: 7 and 23 are one unit.
*2: 10 and 19 are one unit.
*3: 11 and 20 are one unit.
*4: 16 and 21 are one unit.
JSDIA1852ZZ
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-17
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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1. Low brake 2. Drum support 3. Reverse brake
4. Direct clutch 5. High and low reverse clutch 6. 2nd one-way clutch
7.
*1Rear carrier 8. Mid carrier 9. Input clutch
10.
*2Front sun gear 11 .*3Front carrier 12. Under drive carrier
13. 1st one-way clutch 14. Front brake 15. 2346 brake
16.
*4Input shaft 17. Torque converter 18. Oil pump
19.
*2Under drive sun gear 20.*3Under drive internal gear21.*4Front internal gear
22. Mid sun gear 23.
*1Mid internal gear 24. Rear sun gear
25. Rear internal gear 26. High and low reverse clutch hub 27. Control valve & TCM
28. Parking gear 29. Adapter case 30. Output shaft
*1: 7 and 23 are one unit.
*2: 10 and 19 are one unit.
*3: 11 and 20 are one unit.
*4: 16 and 21 are one unit.
JSDIA1774ZZ
Revision: 2010 May2011 QX56

TM-18
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
TRANSMISSION : System Diagram
INFOID:0000000006226763
TRANSMISSION : System DescriptionINFOID:0000000006226764
DESCRIPTION
JSDIA0877GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-19
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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With the use of 4 sets of planetary gears, A/T enabl es 7-speed transmission for forward and 1-speed transmis-
sion for backward, depending on the combination of 3 sets of multiple-disc clutches, 4 sets of multiple-disc
brakes and 2 sets of one-way clutches.
CLUTCH AND BRAKE CHART
POWER TRANSMISSION
“N” Position
JSDIA1455GB
Revision: 2010 May2011 QX56

TM-20
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
Since the low brake is released, torque from the input
shaft drive is not transmitted to the output shaft.
“P” Position
JSDIA0880GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-21
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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 The same as for the “N” position, since the low brake is released, so torque from the input shaft drive is not
transmitted to the output shaft.
 The parking pawl linked with the selector lever mes hes with the parking gear and fastens the output shaft
mechanically.
“D1” Position
JSDIA1277GB
Revision: 2010 May2011 QX56

TM-22
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
 The 1st one-way clutch regulates countercloc
kwise rotation of the under drive carrier.
 The 2nd one-way clutch regulates countercl ockwise rotation of the rear sun gear.
 The mid sun gear is fixed by the low brake.
 Each planetary gear enters the state described below.
JSDIA0866GB
Revision: 2010 May2011 QX56