2005 INFINITI QX4 Factory Service Manual

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Page 97 of 3419

INFINITI QX4 2005 Factory Service Manual AT-26
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
“D”, “4” Positions 4th Gear
The direct clutch is coupled, and the rear carrier and rear sun gear are connected.
The high and low reve

Page 98 of 3419

INFINITI QX4 2005 Factory Service Manual A/T CONTROL SYSTEM
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“D” Position 5th Gear
The front brake fastens the front sun gear.
The input clutch is coupled and the front int

Page 99 of 3419

INFINITI QX4 2005 Factory Service Manual AT-28
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
“R” Position
The front brake fastens the front sun gear.
The high and low reverse clutch is coupled, and the mid sun gear and rear sun ge

Page 100 of 3419

INFINITI QX4 2005 Factory Service Manual A/T CONTROL SYSTEM
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TCM FunctionECS00CDW
The function of the TCM is to:
Receive input signals sent from various switches and sensors.
D

Page 101 of 3419

INFINITI QX4 2005 Factory Service Manual AT-30
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
CAN CommunicationECS00CDX
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an o

AT-30
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
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-5,
"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 communicationsControl itemLine
pressure
controlVehicle
speed
controlShift
controlLock-up
controlEngine
brake
controlFail-safe
function
(*3)Self-diag-
nostics
function
InputAccelerator 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) X X
Wide open throttle position signal
(*4)(*2) X (*2) X (*2) X X
Turbine revolution sensor 1 X X X X X
Turbine revolution sensor 2
(for 4th speed only)XX X XX
Engine speed signals
(*4)XX
PNP switch XXXXXXX
A/T fluid temperature sensors 1, 2 X X X X X X X
ASCDOperation signal
(*4)XXXX
Overdrive cancel
signal
(*4)XXX
TCM power supply voltage signal X X X X X X
Out-
putDirect 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
Line pressure solenoid X X X X X X X
TCC solenoid X X X
Starte r re la yXX

Page 102 of 3419

INFINITI QX4 2005 Factory Service Manual A/T CONTROL SYSTEM
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Line Pressure ControlECS00CDZ
When an input torque signal equivalent to the engine drive force is sent from the ECM

Page 103 of 3419

INFINITI QX4 2005 Factory Service Manual AT-32
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
During Shift Change
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting correspond

Page 104 of 3419

INFINITI QX4 2005 Factory Service Manual A/T CONTROL SYSTEM
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Shift Change System Diagram
*1: Full phase real-time feedback control monitors movement of gear ratio at gear change,

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