Infiniti QX56 (Z62). Manual — part 1283
STRUCTURE AND OPERATION
TM-41
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
C
E
F
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 Description
INFOID:0000000006226765
FLUID COOLER & FLUID WARMER SYSTEM
FLUID COOLER & FLUID WARMER SYSTEM : System Description
INFOID: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
Counterclockwise 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
Counterclockwise 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.
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 cylinder
block of engine.
• When engine is started while engine and A/T are cold, engine cool-
ant temperature rises more quickly than A/T fluid temperature. A/T
fluid warmer is provided with two circuits for ATF and engine cool-
ant respectively so that warmed engine coolant warms ATF
quickly. This helps shorten A/T warming up time, improving fuel
economy.
• A cooling effect is obtained when A/T fluid temperature is high.
A/T fluid cooler (with bypass valve)
• A/T fluid cooler (1) is installed in the front of radiator (2) and con-
denser (3).
• A/T fluid cooler is provided with a bypass valve that controls ATF
flow. Bypass valve operates by thermo wax and a return spring.
Bypass valve fully opens when A/T fluid temperature is approxi-
mately 90
°
C (194
°
F) and fully closes when A/T fluid temperature is
approximately 100
°
C (212
°
F).
• When A/T fluid temperature is low, the bypass valve is open. Most
of ATF therefore returns to the transmission without flowing into the
cooler core that has larger flow resistance.
JSDIA1803GB
JSDIA1811ZZ
JSDIA1814ZZ
JSDIA1815GB
STRUCTURE AND OPERATION
TM-43
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
C
E
F
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 allows ATF to flow into cooler
core. ATF flowing into cooler core is cooled by air stream caused
by vehicle travel and returned to transmission.
JSDIA1816GB
TM-44
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
SYSTEM
SYSTEM
A/T CONTROL SYSTEM
A/T CONTROL SYSTEM : System Diagram
INFOID:0000000006226767
A/T CONTROL SYSTEM : System Description
INFOID:0000000006226768
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
• The A/T senses vehicle operating conditions through various 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 (
Shift change control (
)
Shift pattern control (
)
Lock-up control (
)
Fail-safe control (
Self-diagnosis (
)
CONSULT-III communication line (
)
CAN communication line (
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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