diagram INFINITI QX56 2006 Factory User Guide

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 pressure, shifting point, lock-up operation, and engine brake operation.

Send required output signals to the respective solenoids.
CONTROL SYSTEM OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
CONTROL SYSTEM DIAGRAM
SENSORS (or SIGNALS)

TCM

ACTUATORS
PNP switch
Accelerator pedal position sensor
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed signal
Stop lamp switch signal
Turbine revolution sensor
1st position switch signal
4th position switch signal
ATF pressure switch signal
Tow mode switch signal Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
Duet-EA control
CAN system
Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch
solenoid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Starter relay
Back-up lamp relay
SCIA5624E

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
pressure at real-time to achieve the best gear ratio.
Lock-up ControlECS00CE1
The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve,
which is controlled by a signal from TCM, and the torque converter clutch control valve engages or releases
the torque converter clutch piston.
Lock-up Operation Condition Table
TORQUE CONVERTER CLUTCH CONTROL VALVE CONTROL
Lock-up Control System Diagram
Lock-up Released

In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
PCIA0013E
Select leverD position4 position 3 position 2 position
G ea r p osit io n 54432
Lock-up ×–×××
Slip lock-up ××–––
PCIA0014E

AT-50
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Circuit DiagramECS00CED
BCWA0496E

DTC U1000 CAN COMMUNICATION LINEAT-97
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
Wiring Diagram — AT — CANECS00CEU
BCWA0320E

DTC P0615 START SIGNAL CIRCUITAT-101
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
Wiring Diagram — AT — STSIGECS00CF1
BCWA0321E

AT-106
DTC P0705 PARK/NEUTRAL POSITION SWITCH
Revision: November 20092006 QX56
Wiring Diagram — AT — PNP/SWECS00CF8
BCWA0520E

DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)AT-113
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
Wiring Diagram — AT — VSSA/TECS00CFF
BCWA0497E

AT-128
DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Revision: November 20092006 QX56
Wiring Diagram — AT — FTSECS00CGQ
BCWA0323E

MAIN POWER SUPPLY AND GROUND CIRCUITAT-167
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
MAIN POWER SUPPLY AND GROUND CIRCUITPFP:00100
Wiring Diagram — AT — MAINECS00CJT
BCWA0324E

AT-174
TOW MODE SWITCH
Revision: November 20092006 QX56
Wiring Diagram — AT — TMSWECS00CK0
BCWA0498E