2009 INFINITI QX56 Factory Service Manual

Page 3665 of 4171

INFINITI QX56 2009  Factory Service Manual 
A/T CONTROL SYSTEMTM-17
< FUNCTION DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
“D”, “4” Positions 4GR
 The direct clutch is coupled, and the rear carrier and rear sun gear are connected.
 Th

Page 3666 of 4171

INFINITI QX56 2009  Factory Service Manual 
TM-18
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
“D” Position 5GR
 The front brake fastens the front sun gear.
 The input clutch is coupled and the front internal gear and mid internal gear are

Page 3667 of 4171

INFINITI QX56 2009  Factory Service Manual 
A/T CONTROL SYSTEMTM-19
< FUNCTION DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
“R” Position
 The front brake fastens the front sun gear.
 The high and low reverse clutch is coupled, and the mid

Page 3668 of 4171

INFINITI QX56 2009  Factory Service Manual 
TM-20
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
TCM Function
INFOID:0000000003771808
The function of the TCM is to:
 Receive input signals sent from  various switches and sensors.
 Determine requir

Page 3669 of 4171

INFINITI QX56 2009  Factory Service Manual 
A/T CONTROL SYSTEMTM-21
< FUNCTION DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
CONTROL SYSTEM DIAGRAM 
CAN CommunicationINFOID:0000000003771809
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a se

Page 3670 of 4171

INFINITI QX56 2009  Factory Service Manual 
TM-22
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
Input/Output Signal of TCM
INFOID:0000000003771810
*1: Spare for output speed sensor.
*2: Spare for accelerator pedal position signal
*3: If these inpu

Page 3671 of 4171

INFINITI QX56 2009  Factory Service Manual 
A/T CONTROL SYSTEMTM-23
< FUNCTION DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
 This line pressure solenoid controls the pressure regulat or valve as the signal pressure and adjusts the pres-
sure of

Page 3672 of 4171

INFINITI QX56 2009  Factory Service Manual 
TM-24
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting corresponds to input
torque and gearsh