2006 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2006 Factory Service Manual AT-30
A/T CONTROL SYSTEM
Revision: November 20092006 QX56
TCM FunctionECS00CDW
The function of the TCM is to:
Receive input signals sent from various switches and sensors.
Determine required line pr

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INFINITI QX56 2006 Factory Service Manual A/T CONTROL SYSTEMAT-31
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CAN CommunicationECS00CDX
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real t

A/T CONTROL SYSTEMAT-31
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CAN CommunicationECS00CDX
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-26,
"CAN COMMUNICATION" .
Input/Output Signal of TCMECS00CDY
*1: Spare for vehicle speed sensor·A/T (revolution sensor)
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: CAN communications Control item
Line
pressure
control Vehicle
speed
control Shift
control Lock-up
control Engine
brake
control Fail-safe
function
(*3) Self-diag-
nostics
function
Input Accelerator pedal position signal
(*4)XXXXXXX
Vehicle speed sensor A/T
(revolution sensor) XXXX
XX
Vehicle speed sensor MTR
(*1) (*4)XXXX X
Closed throttle position signal
(*4)(*2) X (*2) X X (*2) XX
Wide open throttle position signal
(*4)(*2) X (*2) X (*2) XX
Turbine revolution sensor 1 XX X XX
Turbine revolution sensor 2
(for 4th speed only) XX
XXX
Engine speed signals
(*4)XX
PNP s witch XXXXXXX
A/T fluid temp eratu re senso rs 1, 2XXXXXXX
ASCD Operation signal
(*4)XXXX
Overdrive cancel
signal
(*4)XX X
TCM power supply voltage signal XXXXX X
Out-
put Direct clutch solenoid (ATF pres-
sure switch 5)
XX
XX
Input clutch solenoid (ATF pressure
switch 3) XX
XX
High and low reverse clutch sole-
noid (ATF pressure switch 6) XX
XX
Front brake solenoid (ATF pressure
switch 1) XX
XX
Low coast brake solenoid (ATF
pressure switch 2) XX
XXX
L in e p re ssu re s olen oid XXXXXXX
TCC solenoid XX X
Sta rter rela y XX

Page 107 of 3383

INFINITI QX56 2006 Factory Service Manual AT-32
A/T CONTROL SYSTEM
Revision: November 20092006 QX56
Line Pressure ControlECS00CDZ
When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the
TCM contr

Page 108 of 3383

INFINITI QX56 2006 Factory Service Manual A/T CONTROL SYSTEMAT-33
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Revision: November 2009 2006 QX56
During Shift Change
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure

Page 109 of 3383

INFINITI QX56 2006 Factory Service Manual AT-34
A/T CONTROL SYSTEM
Revision: November 20092006 QX56
Shift Change System Diagram
*1: Full phase real-time feedback control monitors movement of gear ratio at gear change, and controls oil
pressur

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INFINITI QX56 2006 Factory Service Manual A/T CONTROL SYSTEMAT-35
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Lock-up Applied
In the lock-up applied state, the torque converter clutch control valve is set into the locked stat

Page 111 of 3383

INFINITI QX56 2006 Factory Service Manual AT-36
A/T CONTROL SYSTEM
Revision: November 20092006 QX56
Engine Brake ControlECS00CE2
The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse
drive f

AT-36
A/T CONTROL SYSTEM
Revision: November 20092006 QX56
Engine Brake ControlECS00CE2
The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse
drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling.
Therefore, the low coast brake solenoid is operated to prevent the forward one-way clutch from idling and
the engine brake is operated in the same manner as conventionally.
The operation of the low coast brake solenoid switches the low coast brake switching valve and controls
the coupling and releasing of the low coast brake.
The low coast brake reducing valve controls the low coast brake coupling force.
Control ValveECS00CE3
FUNCTION OF CONTROL VALVE
SCIA1520E
NameFunction
Torque converter regulator valve In order to prevent the pressure supplied to the torque converter from being excessive,
the line pressure is adjusted to the optimum pressure (torque converter operating pres-
sure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeve Adjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valve When the front brake is coupled, adjusts the line pressure to the optimum pressure
(front brake pressure) and supplies it to the front brake. (In 1st, 2nd, 3rd, and 5th gears,
adjusts the clutch pressure.)
Accumulator control valve Adjusts the pressure (accumulator control pressure) acting on the accumulator piston
and low coast reducing valve to the pressure appropriate to the driving state.
Pilot valve A Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for line pressure control, shift change control, and lock-up control.
Pilot valve B Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for shift change control.
Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valve When the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity.
High and low reverse clutch control valve When the high and low reverse clutch is coupled, adjusts the line pressure to the opti-
mum pressure (high and low reverse clutch pressure) and supplies it to the high and low
reverse clutch. (In 1st, 3rd, 4th and 5th gears, adjusts the clutch pressure.)

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INFINITI QX56 2006 Factory Service Manual A/T CONTROL SYSTEMAT-37
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FUNCTION OF PRESSURE SWITCH
Input clutch control valveWhen the input clutch is coupled, adjusts the line pressure t

A/T CONTROL SYSTEMAT-37
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FUNCTION OF PRESSURE SWITCH
Input clutch control valveWhen the input clutch is coupled, adjusts the line pressure to the optimum pressure
(input clutch pressure) and supplies it to the input clutch. (In 4th and 5th gears, adjusts
the clutch pressure.)
Direct clutch control valve When the direct clutch is coupled, adjusts the line pressure to the optimum pressure
(direct clutch pressure) and supplies it to the direct clutch. (In 2nd, 3rd, and 4th gears,
adjusts the clutch pressure.)
TCC control valve
TCC control plug
TCC control sleeve Switches the lock-up to operating or released. Also, by performing the lock-up operation
transiently, lock-up smoothly.
Torque converter lubrication valve Operates during lock-up to switch the torque converter, cooling, and lubrication system
oil path.
Cool bypass valve Allows excess oil to bypass cooler circuit without being fed into it.
Line pressure relief valve Discharges excess oil from line pressure circuit.
N-D accumulator Produces the stabilizing pressure for when N-D is selected.
Manual valve Sends line pressure to each circuit according to the select position. The circuits to which
the line pressure is not sent drain.
Name
Function
NameFunction
Pressure switch 1 (FR/B) Detects any malfunction in the front brake hydraulic pressure. When it detects any mal-
function, it puts the system into fail-safe mode.
Pressure switch 2 (LC/B) Detects any malfunction in the low coast brake hydraulic pressure. When it detects any
malfunction, it puts the system into fail-safe mode.
Pressure switch 3 (I/C) Detects any malfunction in the input clutch hydraulic pressure. When it detects any mal-
function, it puts the system into fail-safe mode.
Pressure switch 5 (D/C) Detects any malfunction in the direct clutch hydraulic pressure. When it detects any mal-
function, it puts the system into fail-safe mode.
Pressure switch 6 (HLR/C) Detects any malfunction in the high and low reverse clutch hydraulic pressure. When it
detects any malfunction, it puts the system into fail-safe mode.

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