2011 INFINITI QX56 Factory Service Manual

charging sensor fuel sat nav homelink jump start

Page 5129 of 5598

INFINITI QX56 2011 Factory Service Manual
STRUCTURE AND OPERATIONTM-41
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Each planetary gear enters the state described below.
Front planetary gear
Under drive planetary g

STRUCTURE AND OPERATIONTM-41
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
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

Page 5130 of 5598

INFINITI QX56 2011 Factory Service Manual
TM-42
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
A/T FLUID COOLER SCHEMATIC
COMPONENT DESCRIPTION
A/T fluid warmer
The A/T fluid warmer (1) is installed on the front part of cylin

Page 5131 of 5598

INFINITI QX56 2011 Factory Service Manual
STRUCTURE AND OPERATIONTM-43
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
When A/T fluid temperature rises [to approximately 100 °C
(212 °F)], bypass valve closes and all

Page 5132 of 5598

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

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INFINITI QX56 2011 Factory Service Manual
SYSTEMTM-45
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Transmit required output signals to the respective solenoids.
A/T CONTROL SYSTEM : Fail-SafeINFOID:0000000006226769

SYSTEMTM-45
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Transmit required output signals to the respective solenoids.
A/T CONTROL SYSTEM : Fail-SafeINFOID:0000000006226769
TCM has the electrical fail-safe mode. The mode is divi ded into a maximum of 3 phases (1st fail-safe, 2nd fail-
safe and final fail-safe) and functions so that the operat ion can be continued even if the signal circuit of the
main electronically controlled input/output parts is damaged.
Even if the electronic circuit is normal, the fail-safe mode may start under special conditions (such as when the
brake pedal is depressed suddenly from a hard wheel spin st atus to stop the rotation of wheels). In this case,
turn the ignition switch OFF and back to ON after 5 seconds to resume the normal shift pattern.
Consequently, the customer's vehicle may already return to the normal condition. Refer to TM-88, "
Diagnosis
Flow".
FAIL-SAFE FUNCTION
1st Fail-SafeThe mode that the vehicle can stop safely, to prompt the driver to stop if the malfunction occurs and to shift to
2nd fail-safe early. It shifts to 2nd fail-safe or final fail-safe after the vehicle stopped.
2nd Fail-Safe The mode that the vehicle shifts to final fail-safe without changing the behavior, by identifying the malfunction-
ing parts in the condition that the driving force required for the driving is secured.
Final Fail-Safe Selects the shifting pattern that the malfunctioning parts identified at 1st fail-safe and 2nd fail-safe are not
used, and then secure the driving force that is required for the driving.
The mode that the shifting performance does not decrease by normal shift control.
DTC Veh ic le
condition Vehicle behavior for 1st fail-safe Vehicle behavior for 2nd fail-safe Vehicle behavior for final fail-safe
P0615 — Starter is disabled — Starter is disabled
P0705 — Fixed in the “D” position (The
shifting can be performed)
30 km/h (19MPH) or less
Lock-up is prohibited
The shifting between the gears of 3 - 4 - 5 - 6 - 7 can be per-
formed
Manual mode is prohibited
Shift position indicator is switched OFF
Starter relay is switched OFF (starter is disabled)
Back-up lamp is OFF
Large shift shock — Fixed in the “D” position (The
shifting can be performed)
30 km/h (19 MPH) or less
Lock-up is prohibited
The shifting between the gears of 3 - 4 - 5 - 6 - 7 can be per-
formed
Manual mode is prohibited
Shift position indicator is switched OFF
Starter relay is switched OFF (starter is disabled)
Back-up lamp is OFF
Large shift shock
P0710 Between
the gears of 1 - 2 - 3 The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited —
The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited
Between
the gears of 4 - 5 - 6 - 7 Fix the gear while driving
Manual mode is prohibited
—
P0717 Between
the gears of
1 - 2 - 3 The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited —
The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited
Between
the gears of 4 - 5 - 6 - 7 Fix the gear while driving
Manual mode is prohibited
—
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
TM-46
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
P0720Between
the gears of 1 - 2 - 3 Only downshift can be per-
formed
Manual mode is prohibited
A vehicle speed signal from the combination

TM-46
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
P0720Between
the gears of 1 - 2 - 3 Only downshift can be per-
formed
Manual mode is prohibited
A vehicle speed signal from the combination mete r is regarded
as an effective signal —
The shifting between the gears of 1 - 2 - 3 can be performed
Manual mode is prohibited
Between
the gears of 4 - 5 - 6 - 7 Fix the gear at driving
Manual mode is prohibited
A vehicle speed signal from the
combination mete r is regarded
as an effective signal —
P0729
P0731
P0732
P0733
P0734
P0735
P1734 Neutral
malfunction
between
the gears of
1 - 2 - 3 and
7
Locks in 4GR
Manual mode is prohibited
Neutral
— Locks in 1GR
The shifting between the gears
of 1 - 2 can be performed
The shifting between the gears
of 1 - 2 - 3 can be performed
The shifting between the gears of 4 - 5 - 6 can be performed
Manual mode is prohibited
Other than
the above Driving with the gear ratio be-
tween 1GR and 2GR
Driving with the gear ratio be-
tween 2GR and 3GR
Locks in 3GR
Locks in 4GR
Fix the gear while driving
Manual mode is prohibited
Neutral The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited Locks in 1GR
The shifting between the gears
of 1 - 2 can be performed
The shifting between the gears of 1 - 2 - 3 can be performed
The shifting between the gears
of 2 - 3 - 4 can be performed
The shifting between the gears of 3 - 4 can be performed
The shifting between the gears of 4 - 5 - 6 can be performed
Manual mode is prohibited
P0730 — Manual mode is prohibited
Neutral The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited Locks in 1GR
The shifting between the gears
of 1 - 2 can be performed
The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited
P0740 — Lock-up is prohibited
Slip lock-up is prohibited —
Lock-up is prohibited
Slip lock-up is prohibited
P0744 — Lock-up is prohibited
Slip lock-up is prohibited — Lock-up is prohibited
Slip lock-up is prohibited
P0750
P0775
P0795
P2713
P2722
P2731
P2807 —
Locks in 2GR, 3GR, 4GR, 5GR,
6GR or 7GR
Manual mode is prohibited — Locks in 1GR
The shifting between the gears
of 1 - 2 - 3 can be performed
The shifting between the gears
of 3 - 4 - 5 can be performed
The shifting between the gears of 4 - 5 - 6 can be performed
The shifting between the gears of 1 - 2 - 3 - 4 - 5 - 6 can be per-
formed
Manual mode is prohibited
P0780 — Manual mode is prohibited
Neutral
— The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited
P1705 — Downshift when accelerator ped-
al is depressed is prohibited
Upshift when accelerator pedal is released is prohibited
Manual mode is prohibited Downshift when accelerator ped-
al is depressed is prohibited
Upshift when accelerator pedal is released is prohibited
Manual mode is prohibited Downshift when accelerator ped-
al is depressed is prohibited
Upshift when accelerator pedal is released is prohibited
Manual mode is prohibited
DTC
Vehicle
condition Vehicle behavior for 1st fail-safe Vehicle behavior for 2nd fail-safe Vehicle behavior for final fail-safe
Revision: 2010 May2011 QX56

Page 5135 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMTM-47
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
A/T CONTROL SYSTEM : Protection ControlINFOID:0000000006226770
The TCM becomes the protection control status temporar

SYSTEMTM-47
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
A/T CONTROL SYSTEM : Protection ControlINFOID:0000000006226770
The TCM becomes the protection control status temporar ily to protect the safety when the safety of TCM and
transmission is lost. It automatically returns to the normal status if the safety is secured.
The TCM has the following protection control.
REVERSE INHIBIT CONTROL
Intercepts the torque transmission and shift to the neutral stat us if the selector lever is shifted to “R” position
while the vehicle moves forward at the vehicle speed 10 km/h (7 MPH) or more.
1ST ENGINE BRAKE PROTECTION CONTROL
Controls the engine brake so as not to make effective by turning the front brake solenoid output to OFF when
each solenoid becomes the electricity pattern of 1st engine brake during driving at the vehicle speed 25 km/h
or more in any positions other than “R” position and 1GR.
TCM HIGH TEMPERATURE PROTECTION CONTROL
Limit the accelerator opening and forcibly control the vehi cle to the low torque driving when the electronic sub-
strate in TCM reaches the high temperature.
P1730 — Neutral
Manual mode is prohibited The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited Locks in 1GR
The shifting between the gears
of 2 - 3 - 4 can be performed
The shifting between the gears
of 3 - 4 can be performed
The shifting between the gears of 4 - 5 - 6 can be performed
Manual mode is prohibited
P1815 — Manual mode is prohibited — Manual mode is prohibited
U0300
U1000 Between
the gears of 1 - 2 - 3 The shifting between the gears
of 1 - 2 - 3 can be performed
Manual mode is prohibited —
The shifting between the gears
of 1 - 2 - 3 can be performed
Line pressure is set to the maxi-
mum hydraulic pressure
Manual mode is prohibited
Between
the gears of 4 - 5 - 6 - 7 Fix the gear at driving
Manual mode is prohibited
—
P0720 and
P1721 — Locks in 5GR — Locks in 5GR
DTC
Veh ic le
condition Vehicle behavior for 1st fail-safe Vehicle behavior for 2nd fail-safe Vehicle behavior for final fail-safe
Malfunction detection condition Vehicle speed: 10 km/h (7 MPH) or more
Control at malfunction Neutral
Normal return condition Vehicle speed: 8 km/h (5 MPH) or less
and
Engine speed: 2,200 rpm or less
Vehicle behavior The torque transmission cannot be performed
There is a shock just before a vehicle stop
Malfunction detection condition Select lever and gear: Any position other than “R” position and 1GR
and
Vehicle speed: More than 25 km/h (16 MPH)
Control at malfunction Front brake solenoid output signal; OFF
Normal return condition Other than detection condition of malfunction
Vehicle behavior Does not exist
Revision: 2010 May2011 QX56

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INFINITI QX56 2011 Factory Service Manual
TM-48
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
SYSTEM
LINE PRESSURE CONTROL
LINE PRESSURE CONTROL : System DiagramINFOID:0000000006226771
LINE PRESSURE CONTROL : System DescriptionINFOID:0000000006226772

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