wheel INFINITI QX56 2007 Factory Service Manual

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QUICK REFERENCE INDEX
AGENERAL INFORMATIONGIGeneral Information
BENGINEEMEngine Mechanical
LUEngine Lubrication System
COEngine Cooling System
ECEngine Control System
FLFuel System
EXExhaust System
ACCAccelerator Control System
CTRANSMISSION/
TRANSAXLEATAutomatic Transmission
DDRIVELINE/AXLETFTransfer
PRPropeller Shaft
FFDFront Final Drive
RFDRear Final Drive
FAXFront Axle
RAXRear Axle
ESUSPENSIONFSUFront Suspension
RSURear Suspension
WTRoad Wheels & Tires
FBRAKESBRBrake System
PBParking Brake System
BRCBrake Control System
GSTEERINGPSPower Steering System
HRESTRAINTSSBSeat Belts
SRSSupplemental Restraint System (SRS)
IBODYBLBody, Lock & Security System
GWGlasses, Window System & Mirrors
RFRoof
EIExterior & Interior
IPInstrument Panel
SESeat
APAdjustable Pedal
JAIR CONDITIONERATCAutomatic Air Conditioner
KELECTRICALSCStarting & Charging System
LTLighting System
DIDriver Information System
WWWiper, Washer & Horn
BCSBody Control System
LANLAN System
AVAudio Visual, Navigation & Telephone System
ACSAuto Cruise Control System
PGPower Supply, Ground & Circuit Elements
LMAINTENANCEMAMaintenance
Edition: August 2006
Revision: December 2007
Publication No. SM7E-1J60U1
B
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© 2007 NISSAN NORTH AMERICA, INC.
All rights reserved. No part of this Service Manual may be reproduced or stored in a retrieval system, or transmitted in any
form, or by any means, electronic, mechanical, photo-copying, recording or otherwise, without the prior written permission
of Nissan North America, Inc.
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2007
QUICK REFERENCE CHART: QX56

Drive Belt Deflection and Tension
Spark Plug (Platinum Tipped)
Front Wheel Alignment (Unladen*1 )ELS00290
*1: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand tools and mats in designated positions.
*2: Target value 37° 31 ′ (37.52 °)
*3: Target value 33 ° 59 ′ (33.98 °)
*4: Target value 37 ° 44 ′ (37.73 °)
*5: Target value 33 ° 29 ′ (33.48 °)
Tension of drive belts Auto adjustment by auto tensioner
Make NGK
Standard type DIFR5A-11
Gap (nominal) 1.1 mm (0.043 in)
Drive type2WD 4WD
Camber
Degree minute (decimal degree) Minimum -0
° 51 ′ (-0.85 °)-0 ° 33 ′ (-0.55 °)
Nominal -0 ° 6 ′ (-0.10 °)0 ° 12 ′ (0.20 °)
Maximum 0 ° 39 ′ (0.65 °)0 ° 57 ′ (0.95 °)
Cross camber 0 ° 45 ′ (0.75 °) or less 0 ° 45 ′ (0.75 °) or less
Caster
Degree minute (decimal degree) Minimum 3
° 15 ′ (3.25 °)2 ° 45 ′ (2.75 °)
Nominal 4 ° 0 ′ (4.00 °)3 ° 30 ′ (3.50 °)
Maximum 4 ° 45 ′ (4.75 °)4 ° 15 ′ (4.25 °)
Cross caster 0 ° 45 ′ (0.75 °) or less 0 ° 45 ′ (0.75 °) or less
Kingpin inclination
Degree minute (decimal degree) 13
° 32 ′ (13.53 °)13 °13 ′ (13.22 °)
Total toe-in Distance (A
− B) Minimum 1.8 mm (0.07 in) 1.8 mm (0.07 in)
Nominal 2.8 mm (0.11 in) 2.8 mm (0.11 in)
Maximum 3.8 mm (0.15 in) 3.8 mm (0.15 in)
Angle (left side and right side)
Degree minute (decimal degree) Minimum 0
° 3 ′ (0.05 °)0 ° 3 ′ (0.05 °)
Nominal 0 ° 5 ′ (0.08 °)0 ° 5 ′ (0.08 °)
Maximum 0 ° 7 ′ (0.12 °)0 ° 7 ′ (0.12 °)
Wheel turning angle
(full turn) Inside
Degree minute (decimal degree)
34
° 31 ′ – 38 ° 31 ′ *2
(34.52 ° – 38.52 °) 34
° 44 ′ – 38 ° 44 ′ *4
(34.73 ° – 38.73 °)
Outside
Degree minute (decimal degree) 30
° 59 ′ – 34 ° 59 ′ *3
(30.98 ° – 34.98 °) 30
° 29 ′ – 34 ° 29 ′ *5
(30.48 ° – 34.48 °)
SFA234AC

QUICK REFERENCE CHART: QX56
2007

Rear Wheel AlignmentELS00291
BrakeELS00292
Unit: mm (in)
Camber
Degree minute (decimal degree)
Minimum 0
° 0 ′ (0 °)
Nominal - 0 ° 30 ′ (-0.5 °)
Maximum - 1 ° 0 ′ (-1.0 °)
Cross camber 0 ° 45 ′ (0.75 °)
To e - i n Distance (A - B)
Minimum 0 mm (0 in)
Nominal 3.3 mm (0.130 in)
Maximum 6.6 mm (0.260 in)
Cross toe 2 mm (0.079 in)
Angle (left, right)
Degree minute (decimal degree) Minimum 0
° 0 ′ (0 °)
Nominal 0 ° 7 ′ (0.11 °)
Maximum 0 ° 14 ′ (0.22 °)
Cross toe 0 ° 8 ′ (0.14 °)
SFA234AC
Front brake Brake model AD41VA
Rotor outer diameter × thickness 350 x 30 (13.78 x 1.18)
Pad Length × width × thickness 151.6 x 56.5 x 12.0 (5.97 x 2.22 x 0.476)
Cylinder bore diameter 51 (2.01)
Rear brake Brake model AD14VE Rotor outer diameter × thickness 320 x 14 (12.60 x 0.55)
Pad Length × width × thickness 83.0 x 33.0 x 8.5 (3.268 x 1.299 x 0.335)
Cylinder bore diameter 48 (1.89)
Control valve Valve model Electric brake force distribution
Brake booster Booster model C215T
Diaphragm diameter 215 (8.46)
Recommended brake fluid Refer to ! Hyper-link Error !

DESCRIPTION
ACS-7
< SERVICE INFORMATION >[ICC]
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Component DescriptionINFOID:0000000003533777
CAN CommunicationINFOID:0000000003533778
SYSTEM DESCRIPTION
Refer to LAN-4 .
Switch OperationINFOID:0000000003533779
The system is operated by a master ON/OFF switch and four control switches, all mounted on the steering
wheel.
ComponentVehicle-to-vehicle
distance control
modeConventional
(fixed speed)
cruise control
modeBrake assist
(with preview
brake)Description
ICC unit×××Controls vehicle speed through ECM via CAN
communication.
ICC sensor××Irradiate laser beam, and receives reflected la-
ser beam to measure distance from preceding
vehicle.
ECM×××Transmits throttle position signal and ICC steer-
ing switch signal to ICC unit.
ABS actuator and electric
unit (control unit)×××Transmits wheel speed signal to ICC unit. Oper-
ates brake booster based on CAN communica-
tion.
Brake pressure sensor××Detects fluid pressure in master cylinder.
Brake booster××Adjusts brake fluid pressure based on command
from ABS actuator and electric unit (control unit).
BCM×Transmit front wiper request signal to ICC unit.
TCM××Transmits gear position signal and output shaft
revolution signal to ICC unit.
No. Switch nameDescription
1 ACCEL/RES switch Resumes set speed or increases speed incrementally.
2 COAST/SET switch Sets desired cruise speed, reduces speed incrementally.
3 ON/OFF switch Master switch to activate the system.
SKIA5973E

ACS-26
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
WORK SUPPORT
Work Item
Cause of Auto-Cancel
1. Touch “WORK SUPPORT” on "SELECT DIAG MODE" screen.
2. Touch “CAUSE OF AUTO-CANCEL” on "SELECT WORK ITEM"
screen.
3. Cause of automatic cancellation screen will be shown.
4. The last five causes of automatic cancellation of ICC system will
be displayed.
Possible Causes of "Auto-Cancel"
Laser Beam Adjust
For details, refer to ACS-12 .
SELF-DIAGNOSTIC RESULTS
For details, refer to ACS-34, "Diagnostic Trouble Code (DTC) Chart" .
DATA MONITOR
CAN DIAG SUPPORT MNTR The results of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending driving signal to them.
ECU PART NUMBER ICC unit part number can be read.ICC diagnostic mode Description
Operation Function
CAUSE OF AUTO-CANCEL Indicates causes of automatic cancellation of the ICC system.
LASER BEAM ADJUST Outputs laser beam, calculates dislocation of the beam, and indicates adjustment direction.
SKIA6191E
Cause of cancellation Description
OPERATING WIPER Windshield wipers were operated at HI or LO speed operation.
OPERATING ABS ABS function was operated.
OPERATING TCS TCS function was operated.
OPERATING VDC VDC function was operated.
ECM CIRCUIT ECM did not permit ICC operation.
OPE SW VOLT CIRC Voltage outside the standard was detected.
LASER SUN BEAM Intense light such as sunlight entered ICC sensor light sensing part.
LASER TEMP Temperature around ICC sensor became low.
WHL SPD ELEC NOISE Wheel speed sensor signal caught electromagnetic noise.
OP SW DOUBLE TOUCH ICC steering switches were pressed at the same time.
VDC/TCS OFF SW VDC OFF switch was pressed.
WHEEL SPD UNMATCH Wheel speed became different from AT vehicle speed.
TIRE SLIP Wheel slipped.
PKB SW ON Parking brake is applied.
IGN LOW VOLT Power supply voltage became low.
NO RECORD—

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-27
< SERVICE INFORMATION >[ICC]
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P Operation Procedure
1. Touch “DATA MONITOR” on "SELECT DIAG MODE" screen.
2. Touch “ECU INPUT SIGNALS”, “MAIN SIGNALS“, or “SELEC-
TION FROM MENU” on "SELECT MONITOR ITEM" screen.
Monitored Item
×: Applicable
BCIA0031E
WDIA0084E
Monitored Item [unit] MAIN SIGNALSECU IN-
PUT SIG-
NALSSELECTION
FROM MENUDescription
VHCL SPEED SE
[km/h] or [mph]×××Indicates vehicle speed calculated from
wheel speed sensor signal.
SET VHCL SPD
[km/h] or [mph]××Indicates set vehicle speed stored in ICC
unit.
THRTL OPENING
[%]×××Indicates throttle angle calculated from sig-
nal voltage of throttle position sensor.
ENGINE RPM
[rpm]××Indicates engine speed read by ICC unit via
CAN communication (ECM transmits engine
speed via CAN communication).
DISTANCE ADJ
[SHOR/MID/LONG]×××Indicates set distance stored in ICC unit.
WIPER SW
[OFF/LOW/HIGH]××Indicates wiper [OFF/LOW/HIGH] status.
MAIN SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
SET/COAST SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
CANCEL SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
RESUME/ACC SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
control switch signal.
CRUISE OPE
[ON/OFF]××Indicates whether vehicle speed is being
controlled or not (ON means “controlling”).
BRAKE SW
[ON/OFF]×××Indicates [ON/OFF] status as judged from
ICC brake switch signal.

ACS-34
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Diagnostic Trouble Code (DTC) ChartINFOID:0000000003533794
×:Applicable
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)
11 CONTROL UNIT×××ו ICC unit internal malfunctionACS-36,
"DTC 11
CON-
TROL
UNIT"
12 VDC CONTROL UNIT×××ו VDC malfunction
• Brake booster signal harness is
open or shortedACS-36,
"DTC 12
VDC
CON-
TROL
UNIT"
20 CAN COMM CIRCUIT×××ו ICC unit detected CAN communi-
cation malfunctionACS-37,
"DTC 20
CAN
COMM
CIR-
CUIT"
31 POWER SUPPLY CIR1×××ו ICC unit power supply voltage is
excessively low (less than 8V)ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
34 POWER SUPPLY CIR2×××ו ICC unit power supply voltage is
excessively high.ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
41 VHCL SPEED SE CIRC×××ו Wheel sensor malfunction
• ABS actuator and electric unit
(control unit) malfunction
• A/T vehicle speed sensor mal-
function
•TCM malfunctionACS-38,
"DTC 41
VHCL
SPEED
SE CIRC"
43 VDC/TCS/ABS CIRC×××ו VDC/TCS/ABS system malfunc-
tionACS-38,
"DTC 43
VDC/
TCS/ABS
CIRC"

A/T CONTROL SYSTEM
AT-37
< SERVICE INFORMATION >
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When shifting from the lock-up released state to the lock-up applied state, the current output to the torque con-
verter clutch solenoid is controlled with the TCM. In this way, when shifting to the lock-up applied state, the
torque converter clutch is temporarily set to the half-clutched state to reduce the shock.
Half-clutched State
• The current output from the TCM to the torque converter clutch solenoid is varied to gradually increase the
torque converter clutch solenoid pressure.
In this way, the lock-up apply pressure gradually rises and while the torque converter clutch piston is put into
half-clutched status, the torque converter clutch piston operating pressure is increased and the coupling is
completed smoothly.
Slip Lock-up Control
• In the slip region, the torque converter clutch solenoid current is controlled with the TCM to put it into the
half-clutched state. This absorbs the engine torque fluctuation and lock-up operates from low speed.
This raises the fuel efficiency for 4th and 5th gears at both low speed and when the accelerator has a low
degree of opening.
Engine Brake ControlINFOID:0000000003532236
• 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 ValveINFOID:0000000003532237
FUNCTION OF CONTROL VALVE
SCIA1520E
Name Function
Torque converter regulator valveIn 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 sleeveAdjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valveWhen 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 valveAdjusts the pressure (accumulator control pressure) acting on the accumulator piston
and low coast reducing valve to the pressure appropriate to the driving state.

TROUBLE DIAGNOSIS
AT-43
< SERVICE INFORMATION >
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TROUBLE DIAGNOSIS
DTC Inspection Priority ChartINFOID:0000000003532243
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
AT- 9 1
.
Fail-SafeINFOID:0000000003532244
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. In fail-safe mode the transmission is fixed in 2nd, 4th or 5th
(depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration”.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's vehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to AT-44, "
How To Perform Trouble Diagnosis for Quick and Accurate Repair").
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark driving possible.
Vehicle Speed Sensor
• Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the
transmission and from combination meter so normal driving is possible even if there is a malfunction in one
of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear is prohib-
ited.
Accelerator Pedal Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based on
input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order to
make driving possible.
PNP Switch
• In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-up
lamp is OFF) and the position is fixed to the “D” range to make driving possible.
Starter Relay
• The starter relay is switched “OFF”. (Starter starting is disabled.)
A/T Interlock
• If there is an A/T interlock judgment malfunction, the transmission is fixed in 2nd gear to make driving possi-
ble.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed,
but this is not a turbine revolution sensor malfunction.
• When the coupling pattern below is detected, the fail-safe action corresponding to the pattern is performed.
A/T INTERLOCK COUPLING PATTERN TABLE
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

ATC-154
< SERVICE INFORMATION >
REFRIGERANT LINES
Removal and Installation for Compressor
INFOID:0000000003533293
A/C Compressor Mounting
REMOVAL
1. Discharge the refrigerant. Refer to ATC-150, "HFC-134a (R-134a) Service Procedure".
2. Remove the front right wheel and tire assembly. Refer to WT-7, "
Rotation".
3. Remove the engine under cover and the splash shield using power tool.
4. Remove the engine air cleaner and air ducts. Refer to EM-15
.
5. Remove the drive belt. Refer to EM-13
.
6. Disconnect the compressor electrical connector.
7. Disconnect the high-pressure flexible hose and low- pressure flexible hose from the compressor.
CAUTION:
Cap or wrap the joint of the pipe with suitable mate rial such as vinyl tape to avoid the entry of air.
8. Remove the compressor bolts and nut using power tools.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace the O-rings of the low-pressure flexibl e hose and high-pressure flexible hose with new
ones, apply compressor oil to the O-rings when installing them.
• After recharging the A/C system with refrigerant, check for leaks.
WJIA0958E