2008 INFINITI QX56 steering wheel

BRAKE TUBE AND HOSEBR-13
< BASIC INSPECTION >
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BRAKE TUBE AND HOSE
Hydraulic CircuitINFOID:0000000004894489
CAUTION:
• All hoses and piping (tubes) must be fr ee from excessive bending, twisting and pulling.
• Make sure there is no interference with other parts when turning the steering wheel both clockwise
and counterclockwise.
• The brake piping is an important safety part. If a brake fluid leak is detected, always disassemble the
parts. Replace applicable part with a new one, if necessary.
• Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
• Do not bend or twist brake hose sharply, or strongly pull it.
• When removing components, cover connections so that no dirt, dust, or other foreign matter gets in.
• Refill with new specified brake fluid. Refer to MA-12, "
Fluids and Lubricants".
• Do not reuse drained brake fluid.
FRONT BRAKE
FRONT BRAKE : InspectionINFOID:0000000004894490
INSPECTION AFTER REMOVAL
CAUTION:
Brake tubes and hoses are important safety parts. Always disassemble the parts and retighten their fit-
tings, if a brake fluid leak is det ected. Replace applicable part with a new one, if damaged part is
detected.
1. Actuator 2. Master cylinder3. Brake booster
4. Connector A. Union bolt
18.2 N·m (1.9 kg-m, 13 ft-lb) B. Flare nut M12
18.2 N·m (1.9 kg-m, 13 ft-lb)
C. Flare nut M10 13.0 N·m (1.3 kg-m, 10 ft-lb)
AWFIA0411ZZ
Revision: March 2010 2008 QX56

BRAKE TUBE AND HOSEBR-21
< ON-VEHICLE REPAIR >
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BRAKE TUBE AND HOSE
Hydraulic CircuitINFOID:0000000004894506
CAUTION:
• All hoses and piping (tubes) must be fr ee from excessive bending, twisting and pulling.
• Make sure there is no interference with other parts when turning the steering wheel both clockwise
and counterclockwise.
• The brake piping is an important safety part. If a brake fluid leak is detected, always disassemble the
parts. Replace applicable part with a new one, if necessary.
• Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
• Do not bend or twist brake hose sharply, or strongly pull it.
• When removing components, cover connections so that no dirt, dust, or other foreign matter gets in.
• Refill with new specified brake fluid. Refer to MA-12, "
Fluids and Lubricants".
• Do not reuse drained brake fluid.
Removal and Installation of Fr ont Brake Piping and Brake HoseINFOID:0000000004894507
REMOVAL
1. Remove front wheel and tire using power tools.
2. Remove brake reservoir cap.
1. Actuator 2. Master cylinder3. Brake booster
4. Connector A. Union bolt
18.2 N·m (1.9 kg-m, 13 ft-lb) B. Flare nut M12
18.2 N·m (1.9 kg-m, 13 ft-lb)
C. Flare nut M10 13.0 N·m (1.3 kg-m, 10 ft-lb)
AWFIA0411ZZ
Revision: March 2010 2008 QX56

BR-32
< ON-VEHICLE REPAIR >
FRONT DISC BRAKE
5. Remove torque member bolts, and remove brake caliperassembly.
CAUTION:
Do not drop brake pad.
6. Apply matching marks to disc rotor and wheel hub assembly as shown if the disc rotor is to be reused, then remove disc rotor.
CAUTION:
Put matching marks on wheel hub assembly and disc rotor
if the disc rotor is to be reused.
INSTALLATION
1. If reusing the disc rotor, use the matching marks to align discrotor on the wheel hub assembly as shown, then install disc
rotor using a wheel nut to hold it in place.
CAUTION:
Use matching marks on wheel hub assembly and disc rotor
if the disc rotor is to be reused.
2. Install brake caliper assembly to vehicle, and tighten torque member bolts to the specified torque.
CAUTION:
Do not allow oil or any moisture on all contact surfaces
between steering knuckle and caliper assembly, bolts, and
washer.
SFIA2437E
SDIA2608E
SDIA2608E
SFIA2437E
Revision: March 2010 2008 QX56

BRC-1
BRAKES
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SECTION BRC
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CONTENTS
BRAKE CONTROL SYSTEM
VDC/TCS/ABS
BASIC INSPECTION ....... .............................
4
DIAGNOSIS AND REPAIR WORKFLOW ..... .....4
Work Flow ........................................................... ......4
Diagnostic Work Sheet ..............................................7
INSPECTION AND ADJUSTMENT .....................8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ......
8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description ..................................
8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement .......
8
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION ............................................ ......
8
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION : Description ..........................
8
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION : Special Repair Require-
ment ..........................................................................
8
CALIBRATION OF DECEL G SENSOR ............... ......9
CALIBRATION OF DECEL G SENSOR : Descrip-
tion ............................................................................
9
CALIBRATION OF DECEL G SENSOR : Special
Repair Requirement ..................................................
9
FUNCTION DIAGNOSIS ..............................11
VDC ................................................................ ....11
System Diagram .................................................. ....11
Hydraulic Circuit Diagram .......................................12
System Description ............................................. ....12
Component Parts Location ......................................13
Component Description ...........................................14
TCS .....................................................................15
System Diagram .................................................. ....15
System Description .................................................15
Component Parts Location .................................. ....16
Component Description ...........................................17
ABS ...................................................................18
System Diagram ......................................................18
System Description ..................................................18
Component Parts Location ......................................19
Component Description ...........................................20
EBD ...................................................................21
System Diagram ......................................................21
System Description ..................................................21
Component Parts Location ......................................22
Component Description ...........................................23
DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] .......
24
CONSULT-III Function (ABS) ..................................24
COMPONENT DIAGNOSIS .........................29
C1101, C1102, C1103, C1104 WHEEL SEN-
SOR-1 ................................................................
29
Description ........................................................... ....29
DTC Logic ................................................................29
Diagnosis Procedure ...............................................29
Component Inspection .............................................31
Special Repair Requirement ....................................31
C1105, C1106, C1107, C1108 WHEEL SEN-
SOR-2 ................................................................
32
Description ...............................................................32
DTC Logic ................................................................32
Diagnosis Procedure ...............................................32
Component Inspection .............................................34
Special Repair Requirement ....................................34
C1109 POWER AND GROUND SYSTEM ........35
Description ...............................................................35
DTC Logic ................................................................35
Diagnosis Procedure ...............................................35
Special Repair Requirement ....................................36
Revision: March 2010 2008 QX56

BRC-2
C1110, C1170 ABS ACTUATOR AND ELEC-
TRIC UNIT (CONTROL UNIT) ...........................
37
DTC Logic ...............................................................37
Diagnosis Procedure ..............................................37
Special Repair Requirement ...................................37
C1111 ABS MOTOR, MOTOR RELAY SYS-
TEM ................................................................. ...
38
Description ........................................................... ...38
DTC Logic ...............................................................38
Diagnosis Procedure ..............................................38
Component Inspection ............................................39
Special Repair Requirement ...................................39
C1113, C1145, C1146 YAW RATE/SIDE/DE-
CEL G SENSOR ............................................. ...
40
Description ........................................................... ...40
DTC Logic ...............................................................40
Diagnosis Procedure ..............................................40
Component Inspection ............................................41
Special Repair Requirement ...................................41
C1115 WHEEL SENSOR ................................ ...43
Description ........................................................... ...43
DTC Logic ...............................................................43
Diagnosis Procedure ..............................................43
Component Inspection ............................................44
Special Repair Requirement ...................................45
C1116 STOP LAMP SWITCH ......................... ...46
Description ........................................................... ...46
DTC Logic ...............................................................46
Diagnosis Procedure ..............................................46
Special Repair Requirement ...................................47
C1120, C1122, C1124, C1126 IN ABS SOL .....48
Description ........................................................... ...48
DTC Logic ...............................................................48
Diagnosis Procedure ..............................................48
Component Inspection ............................................49
Special Repair Requirement ...................................50
C1121, C1123, C1125, C1127 OUT ABS SOL ...51
Description ........................................................... ...51
DTC Logic ...............................................................51
Diagnosis Procedure ..............................................51
Component Inspection ............................................52
Special Repair Requirement ...................................53
C1130, C1131, C1132, C1133, C1136 EN-
GINE SIGNAL ................................................. ...
54
Description ........................................................... ...54
DTC Logic ...............................................................54
Diagnosis Procedure ..............................................54
Special Repair Requirement ...................................54
C1140 ACTUATOR RLY ................................ ...56
Description ........................................................... ...56
DTC Logic ...............................................................56
Diagnosis Procedure ..............................................56
Component Inspection ......................................... ...57
Special Repair Requirement ...................................57
C1142 PRESS SENSOR ...................................58
Description ........................................................... ...58
DTC Logic ...............................................................58
Diagnosis Procedure ...............................................58
Component Inspection ............................................60
Special Repair Requirement ...................................60
C1143, C1144 STEERING ANGLE SENSOR ...61
Description ..............................................................61
DTC Logic ...............................................................61
Diagnosis Procedure ...............................................61
Component Inspection ............................................62
Special Repair Requirement ...................................62
C1155 BRAKE FLUID LEVEL SWITCH ...........64
Description ........................................................... ...64
DTC Logic ...............................................................64
Diagnosis Procedure ...............................................64
Component Inspection ............................................65
Special Repair Requirement ...................................65
C1156 ST ANG SEN COM CIR .........................67
Description ..............................................................67
DTC Logic ...............................................................67
Diagnosis Procedure ...............................................67
C1160 DECEL G SEN SET ...............................68
Description ..............................................................68
DTC Logic ...............................................................68
Diagnosis Procedure ...............................................68
C1163 ST ANGLE SEN SAFE ..........................69
Description ........................................................... ...69
DTC Logic ...............................................................69
Diagnosis Procedure ...............................................69
C1164, C1165, C1166, C1167 CV/SV SYS-
TEM ....................................................................
70
Description ........................................................... ...70
DTC Logic ...............................................................70
Diagnosis Procedure ...............................................70
Component Inspection ............................................71
Special Repair Requirement ...................................72
C1178, C1181, C1184, C1189 ABS ACTIVE
BOOSTER .........................................................
73
Description ........................................................... ...73
DTC Logic ...............................................................73
Diagnosis Procedure ...............................................73
Component Inspection ............................................74
Special Repair Requirement ...................................75
C1179 ABS DELTA S SEN NG .........................76
Description ........................................................... ...76
DTC Logic ...............................................................76
Diagnosis Procedure ...............................................76
Component Inspection ............................................77
Special Repair Requirement ...................................77
Revision: March 2010 2008 QX56

BRC-3
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C1185 ICC UNIT .................................................78
Description .......................................................... ....78
DTC Logic ...............................................................78
Diagnosis Procedure ...............................................78
Special Repair Requirement ...................................79
U1000 CAN COMM CIRCUIT .............................80
Description .......................................................... ....80
DTC Logic ...............................................................80
Diagnosis Procedure ...............................................80
Special Repair Requirement ...................................80
VDC OFF SWITCH ......................................... ....81
Description .......................................................... ....81
Component Function Check ....................................81
Diagnosis Procedure ...............................................81
Component Inspection ............................................82
ABS WARNING LAMP ................................... ....83
Description .......................................................... ....83
Component Function Check ....................................83
Diagnosis Procedure ...............................................83
BRAKE WARNING LAMP ............................. ....84
Description .......................................................... ....84
Component Function Check ....................................84
Diagnosis Procedure ...............................................84
VDC OFF INDICATOR LAMP ............................85
Description .......................................................... ....85
Component Function Check ....................................85
Diagnosis Procedure ...............................................85
SLIP INDICATOR LAMP ....................................86
Description .......................................................... ....86
Component Function Check ....................................86
Diagnosis Procedure ...............................................86
ECU DIAGNOSIS .........................................87
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) .......................................... ....
87
Reference Value ................................................. ....87
Wiring Diagram .......................................................92
Fail-Safe ..................................................................99
DTC No. Index ......................................................100
SYMPTOM DIAGNOSIS ............................102
VDC/TCS/ABS ................................................ ..102
Symptom Table ................................................... ..102
EXCESSIVE ABS FUNCTION OPERATION
FREQUENCY ...................................................
103
Diagnosis Procedure ........................................... ..103
UNEXPECTED PEDAL REACTION ...............104
Diagnosis Procedure ........................................... ..104
THE BRAKING DISTANCE IS LONG .............105
Diagnosis Procedure .............................................105
ABS FUNCTION DOES NOT OPERATE .......106
Diagnosis Procedure .............................................106
PEDAL VIBRATION OR ABS OPERATION
SOUND OCCURS ...........................................
107
Diagnosis Procedure ........................................... ..107
VEHICLE JERKS DURING VDC/TCS/ABS
CONTROL .......................................................
108
Diagnosis Procedure .............................................108
NORMAL OPERATING CONDITION .............109
Description .............................................................109
PRECAUTION ............................................110
PRECAUTIONS ...............................................110
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
110
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .................................
110
Precaution for Brake System .................................111
Precaution for Brake Control .................................111
Precaution for CAN System ...................................112
PREPARATION .........................................113
PREPARATION ...............................................113
Special Service Tool ............................................ ..113
Commercial Service Tool ......................................113
REMOVAL AND INSTALLATION .............114
WHEEL SENSORS .........................................114
Removal and Installation ..................................... ..114
SENSOR ROTOR ............................................115
Removal and Installation .......................................115
ACTUATOR AND ELECTRIC UNIT (ASSEM-
BLY) ................................................................
116
Removal and Installation .......................................116
STEERING ANGLE SENSOR .........................118
Removal and Installation .......................................118
G SENSOR ......................................................119
Removal and Installation .......................................119
Revision: March 2010 2008 QX56

BRC-4
< BASIC INSPECTION >[VDC/TCS/ABS]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000001686231
PRECAUTIONS FOR DIAGNOSIS
If steering angle sensor, steering system parts, suspension system parts, ABS actuator and electric unit (con-
trol unit) or tires have been replaced, or if wheel a
lignment has been adjusted, be sure to adjust neutral posi-
tion of steering angle sensor before driving. Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE
SENSOR NEUTRAL POSITION : Description".
Revision: March 2010 2008 QX56

BRC-8
< BASIC INSPECTION >[VDC/TCS/ABS]
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
ADDITIONAL SERVICE WHEN
REPLACING CONTROL UNIT
ADDITIONAL SERVICE WHEN REPL ACING CONTROL UNIT : Description
INFOID:0000000001686233
After replacing the ABS actuator and electric unit (control unit), perform the following procedures:
• Neutral position adjustment for the steering angle sensor
• Calibration of the decel G sensor
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Re-
quirement
INFOID:0000000001686234
1.PERFORM THE NEUTRAL POSITION ADJUST MENT FOR THE STEERING ANGLE SENSOR
Perform the neutral position adjustm ent for the steering angle sensor.
>> Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Spe-
cial Repair Requirement", GO TO 2
2.PERFORM CALIBRATION OF THE DECEL G SENSOR
Perform calibration of the decel G sensor.
>> Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Special Repair Requirement".
ADJUSTMENT OF STEERING ANGL E SENSOR NEUTRAL POSITION
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Description
INFOID:0000000001686235
Refer to the table below to determine if adjustment of steering angle sensor neutral position is required.
×: Required –: Not required
ADJUSTMENT OF STEERING ANGLE SENS OR NEUTRAL POSITION : Special Re-
pair Requirement
INFOID:0000000001686236
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
CAUTION:
To adjust neutral position of steering angl e sensor, make sure to use CONSULT-III
(Adjustment cannot be done without CONSULT-III)
1.ALIGN THE VEHICLE STATUS
Stop vehicle with front wheels in straight-ahead position.
Situation Adjustment of steering angle sensor neutral position
Removing/Installing ABS actuator and electric unit (control unit) —
Replacing ABS actuator and electric unit (control unit) ×
Removing/Installing steering angle sensor ×
Replacing steering angle sensor ×
Removing/Installing steering components ×
Replacing steering components ×
Removing/Installing suspension components ×
Replacing suspension components ×
Change tires to new ones —
Tire rotation —
Adjusting wheel alignment ×
Battery disconnection ×
Revision: March 2010 2008 QX56