brake sensor INFINITI QX56 2011 Factory Service Manual
[x] Cancel search | Manufacturer: INFINITI, Model Year: 2011, Model line: QX56, Model: INFINITI QX56 2011Pages: 5598, PDF Size: 94.53 MB
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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
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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
 INFINITI QX56 2011  Factory Service Manual 
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](/img/42/57033/w960_57033-5098.png)
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"
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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 p INFINITI QX56 2011  Factory Service Manual 
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 p](/img/42/57033/w960_57033-5099.png)
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
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COMPONENT PARTSTM-13
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A/T CONTROL SYSTEM : High and Lo w Reverse Clutch Solenoid ValveINFOID:0000000006226748
 The high and low r 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 r](/img/42/57033/w960_57033-5100.png)
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.
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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
I INFINITI QX56 2011  Factory Service Manual 
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
I](/img/42/57033/w960_57033-5131.png)
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
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TM-50
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
SHIFT CHANGE CONTROL : System Diagram
INFOID:0000000006226773
SHIFT CHANGE CONTROL : System DescriptionINFOID:0000000006226774
Input/Output Signal Ch INFINITI QX56 2011  Factory Service Manual 
TM-50
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
SHIFT CHANGE CONTROL : System Diagram
INFOID:0000000006226773
SHIFT CHANGE CONTROL : System DescriptionINFOID:0000000006226774
Input/Output Signal Ch](/img/42/57033/w960_57033-5137.png)
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
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SYSTEMTM-53
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via communication line.
The TCM activates low brake solenoid  INFINITI QX56 2011  Factory Service Manual 
SYSTEMTM-53
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via communication line.
The TCM activates low brake solenoid](/img/42/57033/w960_57033-5140.png)
SYSTEMTM-53
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via communication line.
The TCM activates low brake solenoid valve and controls t he low brake oil pressure to the low pressure level
if the driver does not intend to start the vehicle while  the vehicle is being stopped in the “D” position. Therefore,
the low brake is in the release (slip) status and the pow er transmission route of A/T is the same status as the
“N” position. This can decrease the engine load and im proves the fuel economy because the drive force of
engine is not transmitted to the output shaft of A/T.
Idle Neutral Contro l Start Condition
Idle neutral control starts when all of the following c onditions are satisfied. However, the control ends when
any one of the following conditions becomes insufficient during idle neutral control.
NOTE:
The idle neutral control is terminated or prohibited when  the TCM and ECM detect that the vehicle is in any of
the conditions as per the following.
 Engine cooling water temperature and A/T fluid temperature are below or above a prescribed temperature.
 A/T malfunction occurs.
 DTC is detected.
 Fail-safe mode activates.
 Idle neutral control is performed continuously for a certain period of time.
Idle Neutral Contro l Resume Condition
Idle neutral control can be resumed when its start condition  is fulfilled after any of the following operations is
performed (unless a malfunction occurs in the vehicle).
 After driving at more than a prescribed speed.
 When idle neutral control start conditions are fulfilled for a certain period of time.
SHIFT PATTERN CONTROL
Item Signal
TCM function Actuator
Each sensor, switch and 
control unit  ⇒ TCM TCM 
⇒ ECM ECM  ⇒ TCM
Input speed sensor 1, 2 Input speed
N idle instruction 
signal (Standby sig- nal)* N idle instruction 
signal (Start signal)* Idle neutral con-
trol Low brake sole-
noid valve
Output speed sensor Output shaft revolution
A/T fluid temperature 
sensor
ATF temperature
Transmission range 
switch Selector lever position
ECM Engine speed signal*
Accelerator pedal posi-
tion signal*
Throttle position signal*
BCM Stop lamp switch signal*
Turn indicator signal*
ABS actuator electric 
unit (control unit) Pressure sensor signal*
Decel G sensor signal*
Combination meter Vehicle speed signal*
Driving location : Level road and gentle slope
Selector lever position : “D” position
Vehicle speed : 0 km/h (0 MPH)
Accelerator pedal opening : 0.0 / 8
Brake pedal : Depress
Engine speed : Idle speed
Snow mode switch : OFF
Turn signal lamp and ha zard warning lamp : OFF
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SYSTEMTM-55
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 When driving on an up/down slop INFINITI QX56 2011  Factory Service Manual 
SYSTEMTM-55
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 When driving on an up/down slop](/img/42/57033/w960_57033-5142.png)
SYSTEMTM-55
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 When driving on an up/down slope ASC judges up/down slope according to engine torque data transmitted from the ECM and vehicle speed.
Fixing at 4GR, 5GR or 6GR on an up-slope prevents sh ift hunting and controls the vehicle to gain optimum
driving force. On a down-slope, automatic shift-down  to 4GR, 5GR or 6GR controls to gain optimum engine
brake.
 When driving on a curve TCM receives the side G sensor signal from the ABS ac tuator and electric unit (control unit). It locks to 4GR,
5GR or 6GR position in moderate cornering or to 3G R position in sharp cornering based on this signal. This
prevents any upshift and kickdown during corner ing, maintaining smooth vehicle travel.
To w  M o d e
 High driving torque is required for towing a heavy  load. The tow mode enables torque-oriented driving by
changing the shift schedule to that of delaying A/T  gear shift timing (compared to normal driving).
 TCM receives tow mode switch signal from combination meter via CAN communication. The tow mode turns ON when TCM receives the signal. TCM transmits a tow mode indicator lamp signal to the combination
meter via CAN communication to turn ON the tow mode indicator lamp mounted in the combination meter.
MANUAL MODE
Item Signal TCM function Actuator
Input speed sensor 1, 2 Input speed
ASC (Adaptive shift 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)*
ABS actuator and electric unit 
(control unit) Side G sensor signal*
BCM Stop lamp switch signal*
Combination meter Tow mode switch signal*
JSDIA1362GB
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TM-56
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 The TCM receives the manual mode signal, non-manual mode signal INFINITI QX56 2011  Factory Service Manual 
TM-56
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 The TCM receives the manual mode signal, non-manual mode signal](/img/42/57033/w960_57033-5143.png)
TM-56
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
 The TCM receives the manual mode signal, non-manual mode signal, manual mode shift up signal and
manual mode shift down signal from combination meter via CAN communication line. The TCM shifts shift
pattern control to the manual mode based on these signal s, and then shifts the A/T by operating each sole-
noid valve according to the shift operation of the driver.
 The TCM prohibits the manual mode while being in fail-safe mode due to an A/T malfunction, etc. Refer to TM-74, "
Fail-Safe".
Manual Mode Information
 The TCM transmits the manual mode shift refusal signal to the combination meter if the TCM refuses the
transmission from the driving status of vehicle when the  selector lever shifts to “UP (+ side)” or “DOWN (−
side)” side. The combination meter blinks shift indicator on the combination meter and sounds the buzzer to
indicate the driver that the shifting is not performed when receiving this signal. However, the TCM does not
transmit the manual mode shift refusal signal in the conditions as per the following.
- When the selector lever shifts to “DOWN ( − side)” side in 1GR.
- When the selector lever shifts to “UP (+ side)” side in 7GR.
LOCK-UP CONTROL
LOCK-UP CONTROL : System DiagramINFOID:0000000006226777
LOCK-UP CONTROL : System DescriptionINFOID:0000000006226778
 The torque converter clutch piston in the torque conv erter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
 Lock-up operation, however, is prohibited  when A/T fluid temperature is too low.
 The torque converter clutch control valve operation is  controlled by the torque converter clutch solenoid
valve, which is controlled by a signal from TCM,  and the torque converter clutch control valve engages or
releases the torque converter clutch piston.
Item Signal TCM function Actuator
Output speed sensor Vehicle speed
Manual mode 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 sole- noid valve
 Line pressure solenoid valve
 Anti-interlock solenoid valve
A/T fluid temperature sensor ATF temperature
ECM
Engine speed signal*
Accelerator pedal position sig-
nal*
Combination meter Manual mode signal*
Non-manual mode signal*
Manual mode shift up signal*
Manual mode shift down signal*
JSDIA1350GB
Revision: 2010 May2011 QX56  
Page 5150 of 5598
![INFINITI QX56 2011  Factory Service Manual 
TM-62
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
DIAGNOSIS SYSTEM (TCM)
INPUT SPEED (rpm)  X X Displays the input speed calculated from front 
sun gear revolution and front carrier revolution.
F SUN GR REV INFINITI QX56 2011  Factory Service Manual 
TM-62
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
DIAGNOSIS SYSTEM (TCM)
INPUT SPEED (rpm)  X X Displays the input speed calculated from front 
sun gear revolution and front carrier revolution.
F SUN GR REV](/img/42/57033/w960_57033-5149.png)
TM-62
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
DIAGNOSIS SYSTEM (TCM)
INPUT SPEED (rpm)  X X Displays the input speed calculated from front 
sun gear revolution and front carrier revolution.
F SUN GR REV (rpm)  — — Displays the front sun gear revolution calculat-
ed from the pulse signal of input speed sensor 
1.
F CARR GR REV (rpm)  — — Displays the front carrier gear revolution calcu-
lated from the pulse signal of input speed sen-
sor 2.
ENGINE SPEED (rpm)  X X Displays the engine speed received via CAN 
communication.
TC SLIP SPEED (rpm)  — X Displays the revolution difference between in-
put speed and engine speed.
ACCELE POSI (0.0/8) X — Displays the accelerator position estimated val-
ue received via CAN communication.
THROTTLE POSI (0.0/8) X X Displays the throttle position received via CAN 
communication.
ATF TEMP 1 ( °C or  °F) X X Displays the ATF temperature of oil pan calcu-
lated from the signal voltage of A/T fluid tem-
perature sensor.
ATF TEMP 2 ( °C or  °F) X X Displays the ATF temperature estimated value 
of torque converter outlet calculated from the 
signal voltage of A/T fluid temperature sensor.
ATF TEMP SE 1 (V) — — Displays the signal voltage of A/T fluid temper-
ature sensor.
BATTERY VOLT (V) X — Displays the power supply voltage of TCM.
LINE PRES SOL (A) — X Displays the command current from TCM to the 
line pressure solenoid.
TCC SOLENOID (A) — X Displays the command current from TCM to the 
torque converter clutch solenoid.
L/B SOLENOID (A) — X Displays the command current from TCM to the 
low brake solenoid.
FR/B SOLENOID (A) — X Displays the command current from TCM to the 
front brake solenoid.
HLR/C SOL (A) — X Displays the command current from TCM to the 
high and low reverse clutch solenoid.
I/C SOLENOID (A) — X Displays the command current from TCM to the 
input clutch solenoid.
D/C SOLENOID (A) — X Displays the command current from TCM to the 
direct clutch solenoid.
2346/B SOL (A) — X Displays the command current from TCM to the 
2346 brake solenoid.
L/P SOL MON (A) — — Monitors the command current from TCM to the 
line pressure solenoid, and displays the moni-
tor value.
TCC SOL MON (A) — — Monitors the command current from TCM to the 
torque converter clutch solenoid, and displays 
the monitor value.
L/B SOL MON (A) — — Monitors the command current from TCM to the 
low brake solenoid, and displays the monitor 
value.
Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION 
FROM  ITEM
Revision: 2010 May2011 QX56