2006 INFINITI QX56 brake sensor

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-29
[ICC]
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Revision: November 2009 2006 QX56
BRAKE SW
[ON/OFF]××× Indicates [ON/OFF] status as judged from
ICC brake switch signal.
STOP LAMP SW
[ON/OFF] ×××
Indicates [ON/OFF] status as judged from
stop lamp switch signal.
RELEASE SW NO
[ON/OFF] ××Indicates [ON/OFF] status as judged from
release switch signal.
ON when brake is depressed.
OFF when brake is not depressed.
RELEASE SW NC
[ON/OFF] ××Indicates [ON/OFF] status as judged from
release switch signal.
OFF when brake is depressed.
ON when brake is not depressed.
IDLE SW
[ON/OFF] ××Indicates [ON/OFF] status of idle switch
read by ICC unit via CAN communication
(ECM transmits ON/OFF status via CAN
communication).
GEAR
[1, 2, 3, 4, 5] ××Indicates A/T gear position read by ICC unit
via CAN communication (TCM transmits
gear position via CAN communication).
BUZZER O/P
[ON/OFF] ×Indicates [ON/OFF] status of ICC warning
output.
ICC WARNING ×NOTE:
This item is displayed but cannot be moni-
tored.
VHCL SPD AT
[km/h] or [mph] ×Indicates vehicle speed calculated from A/T
vehicle speed sensor by ICC unit via CAN
communication (TCM transmits A/T vehicle
speed sensor signal via CAN communica-
tion).
PRESS SENS
[bar] ××× Indicates brake fluid pressure value calcu-
lated from signal voltage of pressure sen-
sor.
PRESS SENS 2
[bar] ××NOTE:
This item is displayed but cannot be moni-
tored.
D RANGE SW
[ON/OFF] ××Indicates [ON/OFF] status of
“D ” position
read by ICC unit via CAN communication
(TCM transmits ON/OFF condition of “ D”
position via CAN communication).
A/T OD OFF
[ON/OFF] ×
Indicates [ON/OFF] status of OD cancel
output under control.
NP RANGE SW
[ON/OFF] ××Indicates PNP switch signal read by ICC
unit via CAN communication. (TCM trans-
mits PNP switch signal via CAN communi-
cation)
DISTANCE ×NOTE:
This item is displayed but cannot be moni-
tored.
RELATIVE SPD ×NOTE:
This item is displayed but cannot be moni-
tored.
STP LMP DRIVE
[ON/OFF] ×× Indicates [ON/OFF] status of brake hold
relay drive output.
Monitored Item [unit] MAIN SIGNALS
ECU
INPUT
SIGNALS SELECTION
FROM MENU Description

ACS-36
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Diagnostic Trouble Code (DTC) ChartEKS00BLZ
×:Applicable
DTC No. CONSULT-II screen terms ICC sys-
tem
warning
lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Ve h ic le -
to-vehi-cle dis-
tance
control mode Conven-
tional
(fixed
speed) cruise
control mode Brake
assist
(with pre- view
function)
11 CONTROL UNIT ××××

ICC unit internal malfunctionACS-37
12 VDC CONTROL UNIT ××××

VDC malfunction

Brake booster signal harness is
open or shortedACS-37
20 CAN COMM CIRCUIT
××××
ICC unit detected CAN communi-
cation malfunctionACS-38
31 POWER SUPPLY CIR1
××××
ICC unit power supply voltage is
excessively low (less than 8V)ACS-38
34 POWER SUPPLY CIR2
××××
ICC unit power supply voltage is
excessively high.ACS-38
41 VHCL SPEED SE CIRC
××××

Wheel sensor malfunction

ABS actuator and electric unit
(control unit) malfunction

A/T vehicle speed sensor mal-
function

TCM malfunctionACS-39
43 VDC/TCS/ABS CIRC
××××
VDC/TCS/ABS system malfunc-
tionACS-39
45 BRAKE SW/ STOP L SW
××××

ICC brake switch or stop lamp
switch harness is open or shorted

ICC brake switch or stop lamp
switch is stuck to OFF

ICC brake switch or stop lamp
switch is stuck to ONACS-40
46 OPERATION SW CIRC
×××

ICC steering switch harness or
spiral cable is open or shorted

ICC steering switch malfunctionACS-41
74 LASER BEAM OFF CNTR
×××
Laser beam of ICC sensor is off
the aiming point ACS-42
90 STOP LAMP RLY FIX
×××
Normally open terminal of stop
lamp relay is stuck ACS-43
92 ECM CIRCUIT
××××

ECM malfunction

Accelerator pedal position sensor
malfunction

ICC unit malfunctionACS-47
96 NP RANGE
×××

Park/neutral position switch har-
ness is open or shorted

Park/neutral position switch mal-
function

TCM malfunctionACS-48
97 AT CIRCUIT
×××
TCM malfunctionACS-48

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSACS-37
[ICC]
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Revision: November 2009 2006 QX56
NOTE: DTC 55 will display when no malfunction is detected.
DTC 11 CONTROL UNITEKS00BM0
1. DIAGNOSTIC CHECK
Are any items other than “DTC 11 CONTROL UNIT ” indicated on self-diagnosis display?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> Replace ICC unit. Refer to ACS-59, "
ICC Unit" . Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then perform self-diagnosis of ICC system again.
DTC 12 VDC CONTROL UNITEKS00BM1
1. DIAGNOSIS CHECK
With CONSULT-II
Perform self-diagnosis of ABS actuator and electric unit (control unit). Is malfunction indicated?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2. CHECK CONNECTOR ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ICC unit, and ABS actuator and electric unit (control unit) connectors, and connect them securely again. Erase DTC, then perform self-diagnosis of ICC system again.
OK or NG
OK >> Poor connector connection. Check connector housing for disconnected, loose, bent and collapsed terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC sys-
tem running test. Refer to ACS-9, "
ICC System Running Test" . Then perform self-diagnosis of
ICC system again.
NG >> GO TO 3.
98 GEAR POSITION ×××

TCM malfunction

A/T turbine revolution sensor
malfunction

A/T vehicle speed sensor mal-
functionACS-49
102 LASER STAIN
×× ×
ICC sensor body window has
contaminationACS-49
103 LASER SENSOR FAIL
×× ×
ICC sensor internal malfunctionACS-50
104 LASER AIMING INCMP ×× ×
Laser beam aiming of ICC sensor
is not adjustedACS-50
107 LASER COMM FAIL
×× ×

CAN data received by ICC sen-
sor is strange (from ICC unit,
combination meter or ECM)ACS-51
109 LASER HIGH TEMP
×× ×
Temperature around ICC sensor
is excessively highACS-51
DTC
No. CONSULT-II screen terms ICC sys-
tem
warning lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Vehicle-
to-vehi-cle dis- tance
control mode Conven-
tional
(fixed
speed) cruise
control
mode Brake
assist
(with pre- view
function)

AT-2Revision: November 20092006 QX56
CONSULT-II Reference Value .............................
.105
On Board Diagnosis Logic ................................... .105
Possible Cause .................................................... .105
DTC Confirmation Procedure .............................. .105
Wiring Diagram — AT — PNP/SW ...................... .106
Diagnostic Procedure .......................................... .107
DTC P0717 TURBINE REVOLUTION SENSOR ... .109
Description ........................................................... .109
CONSULT-II Reference Value ............................. .109
On Board Diagnosis Logic ................................... .109
Possible Cause .................................................... .109
DTC Confirmation Procedure .............................. .109
Diagnostic Procedure .......................................... .110
DTC P0720 VEHICLE SPEED SENSOR A/T (REV-
OLUTION SENSOR) .............................................. . 111
Description ........................................................... ..111
CONSULT-II Reference Value ...............................111
On Board Diagnosis Logic ................................... ..111
Possible Cause ......................................................111
DTC Confirmation Procedure .............................. ..111
Wiring Diagram — AT — VSSA/T ........................ .113
Diagnostic Procedure .......................................... .114
DTC P0725 ENGINE SPEED SIGNAL .................. .116
Description ........................................................... .116
CONSULT-II Reference Value ............................. .116
On Board Diagnosis Logic ................................... .116
Possible Cause .................................................... .116
DTC Confirmation Procedure .............................. .116
Diagnostic Procedure .......................................... .116
DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE ................................................ .118
Description ........................................................... .118
CONSULT-II Reference Value ............................. .118
On Board Diagnosis Logic ................................... .118
Possible Cause .................................................... .118
DTC Confirmation Procedure .............................. .118
Diagnostic Procedure .......................................... .119
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP) .120
Description ........................................................... .120
CONSULT-II Reference Value ............................. .120
On Board Diagnosis Logic ................................... .120
Possible Cause .................................................... .120
DTC Confirmation Procedure .............................. .120
Diagnostic Procedure .......................................... .121
DTC P0745 LINE PRESSURE SOLENOID VALVE .122
Description ........................................................... .122
CONSULT-II Reference Value ............................. .122
On Board Diagnosis Logic ................................... .122
Possible Cause .................................................... .122
DTC Confirmation Procedure .............................. .122
Diagnostic Procedure .......................................... .123
DTC P1705 THROTTLE POSITION SENSOR ...... .124
Description ........................................................... .124
CONSULT-II Reference Value ............................. .124
On Board Diagnosis Logic ................................... .124
Possible Cause .................................................... .124
DTC Confirmation Procedure .............................. .124
Diagnostic Procedure .......................................... .124
DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT .................................................................
.127
Description ........................................................... .127
CONSULT-II Reference Value .............................. .127
On Board Diagnosis Logic ................................... .127
Possible Cause .................................................... .127
DTC Confirmation Procedure ............................... .127
Wiring Diagram — AT — FTS .............................. .128
Diagnostic Procedure ........................................... .129
Component Inspection ......................................... .130
DTC P1721 VEHICLE SPEED SENSOR MTR ...... .132
Description ........................................................... .132
CONSULT-II Reference Value .............................. .132
On Board Diagnosis Logic ................................... .132
Possible Cause .................................................... .132
DTC Confirmation Procedure ............................... .132
Diagnostic Procedure ........................................... .133
DTC P1730 A/T INTERLOCK ................................ .134
Description ........................................................... .134
On Board Diagnosis Logic ................................... .134
Possible Cause .................................................... .134
DTC Confirmation Procedure ............................... .134
Judgement of A/T Interlock .................................. .135
Diagnostic Procedure ........................................... .135
DTC P1731 A/T 1ST ENGINE BRAKING .............. .137
Description ........................................................... .137
CONSULT-II Reference Value .............................. .137
On Board Diagnosis Logic ................................... .137
Possible Cause .................................................... .137
DTC Confirmation Procedure ............................... .137
Diagnostic Procedure ........................................... .138
DTC P1752 INPUT CLUTCH SOLENOID VALVE . .139
Description ........................................................... .139
CONSULT-II Reference Value .............................. .139
On Board Diagnosis Logic ................................... .139
Possible Cause .................................................... .139
DTC Confirmation Procedure ............................... .139
Diagnostic Procedure ........................................... .140
DTC P1754 INPUT CLUTCH SOLENOID VALVE
FUNCTION ............................................................. .141
Description ........................................................... .141
CONSULT-II Reference Value .............................. .141
On Board Diagnosis Logic ................................... .141
Possible Cause .................................................... .141
DTC Confirmation Procedure ............................... .141
Diagnostic Procedure ........................................... .142
DTC P1757 FRONT BRAKE SOLENOID VALVE .. .143
Description ........................................................... .143
CONSULT-II Reference Value .............................. .143
On Board Diagnosis Logic ................................... .143
Possible Cause .................................................... .143
DTC Confirmation Procedure ............................... .143
Diagnostic Procedure ........................................... .144
DTC P1759 FRONT BRAKE SOLENOID VALVE
FUNCTION ............................................................. .145
Description ........................................................... .145
CONSULT-II Reference Value .............................. .145
On Board Diagnosis Logic ................................... .145
Possible Cause .................................................... .145

AT-4Revision: November 20092006 QX56
Shift Lock Control Unit Reference Values ............
.223
Component Inspection ......................................... .224
SHIFT CONTROL SYSTEM ................................... .226
Control Device Removal and Installation ............. .226
Adjustment of A/T Position .................................. .227
Checking of A/T Position ..................................... .227
ON-VEHICLE SERVICE ......................................... .228
Oil Pan ................................................................. .228
Control Valve With TCM and A/T Fluid Temperature
Sensor 2 .............................................................. .230
Rear Oil Seal ....................................................... .240
AIR BREATHER HOSE .......................................... .241
Removal and Installation ..................................... .241
TRANSMISSION ASSEMBLY ............................... .243
Removal and Installation (2WD) .......................... .243
Removal and Installation (4WD) .......................... .246
OVERHAUL ............................................................ .250
Components ........................................................ .250
Oil Channel .......................................................... .258
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ......................... .260
DISASSEMBLY ...................................................... .264
Disassembly ........................................................ .264
REPAIR FOR COMPONENT PARTS ..................... .282
Oil Pump .............................................................. .282Front Sun Gear, 3rd One-Way Clutch ..................
.284
Front Carrier, Input Clutch, Rear Internal Gear .... .286
Mid Sun Gear, Rear Sun Gear, High and Low
Reverse Clutch Hub ............................................. .291
High and Low Reverse Clutch ............................. .296
Direct Clutch ........................................................ .298
ASSEMBLY ............................................................ .300
Assembly (1) ........................................................ .300
Adjustment ........................................................... .313
Assembly (2) ........................................................ .316
SERVICE DATA AND SPECIFICATIONS (SDS) ... .323
General Specifications ......................................... .323
Vehicle Speed When Shifting Gears .................... .323
Vehicle Speed When Performing and Releasing
Complete Lock-up ................................................ .324
Vehicle Speed When Performing and Releasing
Slip Lock-up ......................................................... .324
Stall Speed ........................................................... .324
Line Pressure ....................................................... .324
A/T Fluid Temperature Sensor ............................. .324
Turbine Revolution Sensor ................................... .324
Vehicle Speed Sensor A/T (Revolution Sensor) .. .324
Reverse brake ...................................................... .325
Total End Play ...................................................... .325

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

A/T CONTROL SYSTEMAT-31
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Revision: November 2009 2006 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-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

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 pattern setting corresponds to input
torque and gearshift selection. Also, line pressure characteristic is
set according to engine speed, during engine brake operation.
At Low Fluid Temperature
When the A/T fluid temperature drops below the prescribed tempera-
ture, in order to speed up the action of each friction element, the line
pressure is set higher than the normal line pressure characteristic.
Shift ControlECS00CE0
The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the
clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes
possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change charac-
teristic is attained.
SHIFT CHANGE
The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque informa-
tion, etc.
PCIA0010E
PCIA0011E
PCIA0012E