brakes 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
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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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ACS-6
< SERVICE INFORMATION >[ICC]
DESCRIPTION
DESCRIPTION
OutlineINFOID:0000000003533775
The Intelligent Cruise Control (ICC) system automatically maintains a selected distance from the vehicle
ahead according to that vehicle's speed, or at the set speed, if the road ahead is clear.
The ICC function has two cruise control modes and brake assist (with preview function). The ICC system may
AUTO-CANCEL for various reasons, for example, when the windshield wipers are operating.
VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE
Vehicle-to-vehicle distance control mode, the same speed as other vehicles, can be maintained without the
constant need to adjust the operating speed as with a conventional cruise control system.
The system is intended to enhance the operation of the vehicle when following another vehicle in the same
lane and direction.
If the distance sensor detects a slower moving vehicle ahead, the system will reduce speed so that the vehicle
ahead can be followed at the selected distance.
The system automatically controls the throttle and applies the brakes (up to 25% of vehicle braking power) if
necessary.
The detection range of the sensor is approximately 120 m (390 ft) ahead.
Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
CONVENTIONAL (FIXED SPEED) CRUISE CONTROL MODE
Conventional (fixed speed) cruise control mode is cruising at preset speeds.
Refer to Owner's Manual for Intelligent Cruise Control System operation instructions.
BRAKE ASSIST (WITH PREVIEW FUNCTION)
When the force applied to brake pedal exceeds a certain level, the brake assist is activated and generates a
greater braking force than that of a conventional brake booster, even with light pedal force.
When the preview function identifies the need to apply the sudden brake by sensing the vehicle ahead in the
same lane and the distance and relative speed from it, it applies the brake pre-pressure before driver
depresses the brake pedal and improves brake response by reducing its free play.
Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
SchematicINFOID:0000000003533776
WKIA1976E

TROUBLE DIAGNOSIS
AT-47
< SERVICE INFORMATION >
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AT
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P Diagnostic Worksheet Chart
Customer name MR/MS Model & Year VIN
Trans. Model Engine Mileage
Malfunction Date Manuf. Date In Service Date
Frequencyo Continuouso Intermittent ( times a day)
Symptomso Vehicle does not move. (o Any positiono Particular position)
o No up-shift (o 1st → 2ndo 2nd → 3rdo 3rd → 4th o 4th → 5th)
o No down-shift (o 5th → 4th o 4th → 3rdo 3rd → 2ndo 2nd → 1st)
o Lock-up malfunction
o Shift point too high or too low.
o Shift shock or slip (o N → Do Lock-upo Any drive position)
o Noise or vibration
o No kick down
o No pattern select
o Others
()
Malfunction indicator lamp (MIL)o Continuously lito Not lit
1o Read the item on cautions concerning fail-safe and understand the customer's complaint.AT- 4 3
2o ATF inspection
AT- 5 1o Leak (Repair leak location.)
o Sta te
o Amount
3o Stall test and line pressure test
AT- 5 1
, AT-
51
o Stall test
o Torque converter one-way clutch
o Front brake
o High and low reverse clutch
o Low coast brake
o Forward brake
o Reverse brake
o Forward one-way clutcho 1st one-way clutch
o 3rd one-way clutch
o Engine
o Line pressure low
o Except for input clutch and direct
clutch, clutches and brakes OK
o Line pressure inspection - Suspected part:

BR-1
BRAKES
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SECTION BR
A
B
BR
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CONTENTS
BRAKE SYSTEM
SERVICE INFORMATION ............................2
PRECAUTIONS ...................................................2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
2
Precaution for Brake System ....................................2
PREPARATION ...................................................3
Special Service Tool .................................................3
Commercial Service Tool ..........................................3
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING .............................
4
NVH Troubleshooting Chart ......................................4
BRAKE PEDAL ...................................................5
Inspection and Adjustment ........................................5
Removal and Installation ...........................................6
BRAKE FLUID .....................................................8
On Board Inspection .................................................8
Drain and Refill ..........................................................8
Bleeding Brake System .............................................8
BRAKE PIPING AND HOSE ..............................10
Hydraulic Circuit ......................................................10
Removal and Installation of Front Brake Hose ........10
Removal and Installation of Rear Brake Hose ........11
Inspection After Installation .....................................12
BRAKE MASTER CYLINDER ............................13
On Board Inspection ...............................................13
Removal and Installation .........................................13
Disassembly and Assembly ....................................14
BRAKE BOOSTER ...........................................15
On-Vehicle Service ..................................................15
Removal and Installation .........................................15
VACUUM LINES ...............................................17
Removal and Installation .........................................17
Inspection ................................................................17
FRONT DISC BRAKE .......................................18
On-vehicle Inspection ..............................................18
Component ..............................................................18
Removal and Installation of Brake Pad ...................19
Removal and Installation of Brake Caliper and
Disc Rotor ................................................................
19
Disassembly and Assembly of Brake Caliper ..........20
REAR DISC BRAKE .........................................24
On-vehicle Inspection ..............................................24
Exploded View .........................................................24
Removal and Installation of Brake Pad ...................25
Removal and Installation of Brake Caliper and
Disc Rotor ................................................................
25
Brake Caliper ...........................................................26
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
29
General Specification ..............................................29
Brake Pedal .............................................................29
Brake Booster ..........................................................30
Check Valve ............................................................30
Front Disc Brake ......................................................30
Rear Disc Brake ......................................................30

BRC-1
BRAKES
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SECTION BRC
A
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BRC
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CONTENTS
BRAKE CONTROL SYSTEM
VDC/TCS/ABS
SERVICE INFORMATION ............................
3
PRECAUTIONS ...................................................3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
3
Precaution for Brake System ....................................3
Precaution When Using CONSULT-II .......................3
Precaution for Brake Control .....................................4
Precaution for CAN System ......................................4
PREPARATION ...................................................6
Special Service Tool .................................................6
Commercial Service Tool ..........................................6
SYSTEM DESCRIPTION .....................................7
System Component ...................................................7
ABS Function ............................................................8
EBD Function ............................................................8
TCS Function ............................................................8
VDC Function ............................................................8
Fail-Safe Function .....................................................8
Hydraulic Circuit Diagram .........................................9
CAN COMMUNICATION ....................................10
System Description .................................................10
TROUBLE DIAGNOSIS .....................................11
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ......................................................
11
Component Parts and Harness Connector Loca-
tion ..........................................................................
14
Schematic ...............................................................15
Wiring Diagram - VDC - ..........................................16
Basic Inspection ......................................................22
Warning Lamp and Indicator Timing .......................23
Control Unit Input/Output Signal Standard ..............23
CONSULT-II Function (ABS) ..................................26
TROUBLE DIAGNOSIS FOR SELF-DIAG-
NOSTIC ITEMS .................................................
34
Wheel Sensor System Inspection ............................34
Engine System Inspection .......................................35
ABS/TCS/VDC Control Unit Inspection ...................35
Steering Angle Sensor System ................................36
Yaw Rate/Side/Decel G Sensor System Inspec-
tion ...........................................................................
37
Solenoid and VDC Change-Over Valve System
Inspection ................................................................
38
Actuator Motor, Motor Relay, and Circuit Inspec-
tion ...........................................................................
39
Stop Lamp Switch System Inspection .....................40
ABS/TCS/VDC Control Unit Power and Ground
Systems Inspection .................................................
41
Brake Fluid Level Switch System Inspection ...........42
Active Booster System Inspection ...........................43
Delta Stroke Sensor System Inspection ..................44
Pressure Sensor System Inspection .......................45
Steering Angle Sensor Safe Mode Inspection .........47
CAN Communication System Inspection .................48
ICC System Inspection ............................................48
Inspection for Self-Diagnosis Result "ST ANG
SEN SIGNAL" ..........................................................
48
Inspection for Self-Diagnosis Result "DECEL G
SEN SET" ................................................................
49
TROUBLE DIAGNOSES FOR SYMPTOMS .....50
ABS Works Frequently ............................................50
Unexpected Pedal Action ........................................50
Long Stopping Distance ..........................................51
ABS Does Not Work ................................................51
Pedal Vibration or ABS Operation Noise .................51
Vehicle Jerks During TCS/VDC Activation ..............52
Component Inspection .............................................53
ON-VEHICLE SERVICE ....................................54
Adjustment of Steering Angle Sensor Neutral Po-
sition ........................................................................
54
Calibration of Decel G Sensor .................................54

OVERHEATING CAUSE ANALYSIS
CO-7
< SERVICE INFORMATION >
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Except cool-
ing system
parts mal-
function— Overload on engineAbusive drivingHigh engine rpm under no
load
Driving in low gear for ex-
tended time
Driving at extremely high
speed
Powertrain system malfunc-
tion
— Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper —
— Blocked radiator grilleInstalled car brassiere
Mud contamination or paper
clogging
Blocked radiator —
Blocked condenser
Blocked air flow
Installed large fog lamp Symptom Check items

REAR SONAR SYSTEM
DI-51
< SERVICE INFORMATION >
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How to Proceed with Trouble DiagnosisINFOID:0000000003533529
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to DI-46, "
System Description".
3. Perform pre-diagnosis inspection. Refer to DI-51, "
Pre-diagnosis Inspection".
4. Perform self-diagnosis. Refer to DI-51, "
Self-Diagnosis Function".
5. Perform the preliminary check. Refer to DI-53, "
Preliminary Check".
6. Check symptom and repair or replace the cause of malfunction. Refer to DI-54, "
Symptom Chart".
7. Does the rear sonar system operate properly? If so, go to 8. If not, go to 3.
8. Clear fault codes. Refer to DI-51, "
Self-Diagnosis Function".
9. Inspection End.
Pre-diagnosis InspectionINFOID:0000000003533530
SENSOR STATUS CHECK
• Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deformation in sensor
mounting area.
• Check that snow, mud, or other foreign objects are not adhering to the rear sonar sensor.
• Check that there is no deformation, scratches, or other damage to the rear sonar sensor.
• Check that water has not accumulated in the rear sonar sensor.
CAUTION:
Use water, cotton swab, or other soft material for cleaning the sensor.
1. Check that there are no obstacles within each rear sonar sensor's detection range.
2. Check that there are no nearby ultrasound sources (such as the sounds of vehicle horns, motorcycle
engines, or truck air brakes).
3. Check that the vehicle is on a level surface.
Self-Diagnosis FunctionINFOID:0000000003533531
There are four modes of self-diagnosis; entering diagnostics, requesting number of fault codes, requesting
fault codes, and idling or clearing fault codes. These steps must be followed in order. Self-diagnosis can be
manually exited by turning the ignition switch OFF, or selecting reverse gear. Self-diagnosis will exit unless a
fault code request occurs before a message is repeated five times without acknowledgement.
ENTERING DIAGNOSTICS MODE
1. Turn ignition switch ON. Rear sonar system OFF switch indica-
tor lamp illuminates for three seconds and then turns off.
2. Immediately push rear sonar system OFF switch ten times
within five seconds.
3. The sonar buzzer will sound once and the rear sonar system
OFF indicator will flash once.
REQUESTING NUMBER OF FAULT CODES MODE
Detection range
Rear sonar sensors Approx. 1.8 m (5.9 ft.) maximum
LKIA0389E

FAX-4
< SERVICE INFORMATION >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000003532613
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
FAX-7FAX-8FAX-8FAX-7—
FAX-5
PR-3, "
NVH Troubleshooting Chart
"
FFD-6, "
NVH Troubleshooting Chart
"
Refer to DRIVE SHAFT in this chart.
Refer to WHEEL HUB in this chart.
FSU-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
BR-4, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible cause and SUSPECTED PARTS
Excessive joint angle
Joint sliding resistance
Imbalance
Improper installation, looseness
Parts interference
Wheel bearing damage
PROPELLER SHAFT
FRONT FINAL DRIVE
DRIVE SHAFT
WHEEL HUB
SUSPENSION
TIRES
ROAD WHEEL
BRAKES
STEERING
SymptomDRIVE SHAFTNoise, Vibration×× ×× × ×××× ×
Shake× × × × ×××× ×
WHEEL HUBNoise×× ×× × ×××× ×
Shake×× × × ×××× ×
Vibration×× × × ×× ×
Shimmy×× ×××× ×
Shudder× ×××× ×
Poor quality ride or
handling××× ×××

FFD-6
< SERVICE INFORMATION >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000003532587
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
FFD-13FFD-13FFD-13FFD-13FFD-13FFD-7
PR-3, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
FSU-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
BR-4, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible cause and SUSPECTED PARTS
Gear tooth rough
Gear contact improper
Tooth surfaces worn
Incorrect backlash
Companion flange excessive runout
Gear oil improper
PROPELLER SHAFT
FRONT AXLE
FRONT SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
STEERING
Symptom Noise××××××××××××××

FSU-4
< SERVICE INFORMATION >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting ChartINFOID:0000000003532634
Use the chart below to help you find the cause of the symptom. Repair or replace parts as necessary.
x: ApplicableReference page
FSU-5FSU-10FSU-5FSU-5FSU-20FSU-6FSU-6FSU-6
PR-3, "
NVH Troubleshooting Chart
"
FFD-6, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
FAX-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
WT-4, "
NVH Troubleshooting Chart
"
BR-4, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible Cause and
SUSPECTED PARTS
Improper installation, looseness
Shock absorber deformation,
damage or deflection
Bushing or mounting deterioration
Parts interference
Spring fatigue
Suspension looseness
Incorrect wheel alignment
Stabilizer bar fatigue
PROPELLER SHAFT
FRONT FINAL DRIVE
DRIVE SHAFT
WHEEL HUB
TIRES
ROAD WHEEL
BRAKES
STEERING
SymptomNoise× × ×××× × × ×× × × ××
Shake× × ×× × × ×× × × ××
Vibration× × ××× × ×× × ×
Shimmy× × ×× × × × × ××
Shudder××× ×××××
Poor quality ride or handling××××× ×× ×××