2011 INFINITI QX56 Factory Service Manual

octane MPG engine overheat fuel language service interval reset

Load previous 8 pages

Page 5137 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMTM-49
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
When the select operation is performed during driving and the A/T is
shifted down, the line pressure is set according

Page 5138 of 5598

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

Page 5139 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMTM-51
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
*: This signal is transmitted via communication line.
The clutch pressure control solenoid is controlled by the sign

Page 5140 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-52
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
TCM selects “BLIPPING CONTROL”
or “NORMAL SHIFT CONTROL” according to the gear position, the
selector lever position, the engine torque an

Page 5141 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMTM-53
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Input/Output Signal Chart
*: This signal is transmitted via communication line.
The TCM activates low brake solenoid

SYSTEMTM-53
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
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
Revision: 2010 May2011 QX56

Page 5142 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-54
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
SHIFT PATTERN CONTROL : System Diagram
INFOID:0000000006226775
SHIFT PATTERN CONTROL : System DescriptionINFOID:0000000006226776
It automatically sel

Page 5143 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMTM-55
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
When driving on an up/down slop

SYSTEMTM-55
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
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
Revision: 2010 May2011 QX56

Page 5144 of 5598

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

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

Load next 8 pages

Page: < prev 1-10 ... 5105-5112 5113-5120 5121-5128 5129-5136 5137-5144 5145-5152 5153-5160 5161-5168 5169-5176 ... 5600 next >

instrument cluster cooling oil capacities sport mode coolant temperature deactivate airbag