Infiniti QX56 (Z62). Manual — part 129

BRC-1

BRAKES

C

D

E

G

H

I

J

K

L

M

SECTION

BRC

A

B

BRC

N

O

P

CONTENTS

BRAKE CONTROL SYSTEM

WITH VDC

PRECAUTION . . . . . . . . . . . ...

5

PRECAUTIONS . . . . . . . . . . . . ...

5

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" . . . . . . . . . . . . . . . . ...

5

Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect . . . . . . . . .....

5

Precaution for Procedure without Cowl Top Cover

. ..

6

Precaution for Brake System . . . . . . . . ....

6

Precaution for Brake Control System . . . . . ....

6

Precaution for Harness Repair . . . . . . . . ..

7

PREPARATION . . . . . . . . . . .

9

PREPARATION . . . . . . . . . . . . ...

9

Commercial Service Tools . . . . . . . . . ....

9

SYSTEM DESCRIPTION . . . . . . . .

10

COMPONENT PARTS . . . . . . . . . ...

10

Component Parts Location . . . . . . . . . ..

10

Component Description . . . . . . . . . . ...

13

ABS Actuator and Electric Unit (Control Unit) . . .

14

Wheel Sensor and Sensor Rotor . . . . . . .

14

Stop Lamp Switch . . . . . . . . . . . . ...

15

Steering Angle Sensor . . . . . . . . . . .

15

Yaw Rate/Side/Decel G sensor . . . . . . . ...

15

Brake Fluid Level Switch . . . . . . . . . . .

15

Parking Brake Switch . . . . . . . . . . . ..

15

VDC OFF Switch . . . . . . . . . . . . . .

15

SYSTEM . . . . . . . . . . . . . . . .

16

System Description . . . . . . . . . . . . .

16

Fail-safe . . . . . . . . . . . . . . . . ..

25

Protection Function . . . . . . . . . . . . .

28

VDC FUNCTION . . . . . . . . . . . . . .

28

VDC FUNCTION : System Description . . . . ...

28

TCS FUNCTION . . . . . . . . . . . . . . .

31

TCS FUNCTION : System Description . . . . .

31

ABS FUNCTION . . . . . . . . . . . . . .

32

ABS FUNCTION : System Description . . . . .

33

EBD FUNCTION . . . . . . . . . . . . . .

34

EBD FUNCTION : System Description . . . . .

34

HILL START ASSIST FUNCTION . . . . . . . .

36

hill start assist FUNCTION : System Description .

36

BRAKE LIMITED SLIP DIFFERENTIAL (BLSD)
FUNCTION . . . . . . . . . . . . . . . . .

37

BRAKE LIMITED SLIP DIFFERENTIAL (BLSD)
FUNCTION : System Description . . . . . . .

37

DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] . ...

40

CONSULT-III Function . . . . . . . . . . .

40

ECU DIAGNOSIS INFORMATION . . . ..

45

ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) . . . . . . . . . . . .

45

Reference Value . . . . . . . . . . . . . ..

45

Fail-safe . . . . . . . . . . . . . . . . ...

47

Protection Function . . . . . . . . . . . . ..

50

DTC Inspection Priority Chart . . . . . . . . ..

50

DTC Index . . . . . . . . . . . . . . . ...

51

WIRING DIAGRAM . . . . . . . . . ..

53

BRAKE CONTROL SYSTEM . . . . . . ...

53

Wiring Diagram . . . . . . . . . . . . . .

53

BASIC INSPECTION . . . . . . . . ...

60

DIAGNOSIS AND REPAIR WORK FLOW . ...

60

Work Flow . . . . . . . . . . . . . . . .

60

Diagnostic Work Sheet . . . . . . . . . . .

61

BRC-2

ADDITIONAL SERVICE WHEN REPLACING
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) . . . . . . . . . . . ..

63

Description . . . . . . . . . . . . . . . ..

63

ADJUSTMENT OF STEERING ANGLE SEN-
SOR NEUTRAL POSITION . . . . . . . ...

64

Description . . . . . . . . . . . . . . . ..

64

Work Procedure . . . . . . . . . . . . . ..

64

CALIBRATION OF DECEL G SENSOR . . ...

66

Description . . . . . . . . . . . . . . . ..

66

Work Procedure . . . . . . . . . . . . . ..

66

DTC/CIRCUIT DIAGNOSIS . . . . . . .

68

C1101, C1102, C1103, C1104 WHEEL SEN-
SOR . . . . . . . . . . . . . . . . .

68

DTC Logic . . . . . . . . . . . . . . . ...

68

Diagnosis Procedure . . . . . . . . . . . ..

68

C1105, C1106, C1107, C1108 WHEEL SEN-
SOR . . . . . . . . . . . . . . . . .

70

DTC Logic . . . . . . . . . . . . . . . ...

70

Diagnosis Procedure . . . . . . . . . . . ..

70

C1109 POWER AND GROUND SYSTEM . . .

72

Description . . . . . . . . . . . . . . . ..

72

DTC Logic . . . . . . . . . . . . . . . ...

72

Diagnosis Procedure . . . . . . . . . . . ..

72

C1111 PUMP MOTOR . . . . . . . . . ...

75

DTC Logic . . . . . . . . . . . . . . . ...

75

Diagnosis Procedure . . . . . . . . . . . ..

75

C1115 WHEEL SENSOR . . . . . . . . ...

77

DTC Logic . . . . . . . . . . . . . . . ...

77

Diagnosis Procedure . . . . . . . . . . . ..

77

C1116 STOP LAMP SWITCH . . . . . . .

79

DTC Logic . . . . . . . . . . . . . . . ...

79

Diagnosis Procedure . . . . . . . . . . . ..

79

Component Inspection (Stop lamp Switch) . . ....

85

Component Inspection (Stop Lamp Relay) . . . .

86

C1118 TRANSFER CONTROL UNIT . . . .

87

DTC Logic . . . . . . . . . . . . . . . ...

87

Diagnosis Procedure . . . . . . . . . . . ..

87

C1120, C1122, C1124, C1126 ABS IN VALVE
SYSTEM . . . . . . . . . . . . . . . .

88

DTC Logic . . . . . . . . . . . . . . . ...

88

Diagnosis Procedure . . . . . . . . . . . ..

88

C1121, C1123, C1125, C1127 ABS OUT
VALVE SYSTEM . . . . . . . . . . . .

90

DTC Logic . . . . . . . . . . . . . . . ...

90

Diagnosis Procedure . . . . . . . . . . . ..

90

C1130 ENGINE SIGNAL . . . . . . . . ...

92

DTC Logic . . . . . . . . . . . . . . . ...

92

Diagnosis Procedure . . . . . . . . . . . ...

92

C1140 ACTUATOR RELAY SYSTEM . . . ..

93

DTC Logic . . . . . . . . . . . . . . . ...

93

Diagnosis Procedure . . . . . . . . . . . ...

93

C1142 PRESS SENSOR . . . . . . . . ...

95

DTC Logic . . . . . . . . . . . . . . . ...

95

Diagnosis Procedure . . . . . . . . . . . ...

95

C1143 STEERING ANGLE SENSOR . . . ...

97

DTC Logic . . . . . . . . . . . . . . . ...

97

Diagnosis Procedure . . . . . . . . . . . ...

97

C1144 INCOMPLETE STEERING ANGLE
SENSOR ADJUSTMENT . . . . . . . . ..

99

DTC Logic . . . . . . . . . . . . . . . ...

99

Diagnosis Procedure . . . . . . . . . . . ...

99

C1145, C1146 YAW RATE/SIDE/DECEL G
SENSOR . . . . . . . . . . . . . . ...

100

DTC Logic . . . . . . . . . . . . . . . .

100

Diagnosis Procedure . . . . . . . . . . . .

100

C1155 BRAKE FLUID LEVEL SWITCH . . ..

103

DTC Logic . . . . . . . . . . . . . . . .

103

Diagnosis Procedure . . . . . . . . . . . .

103

Component Inspection . . . . . . . . . . ..

104

C1160 DECEL G SEN SET . . . . . . . ..

105

DTC Logic . . . . . . . . . . . . . . . .

105

Diagnosis Procedure . . . . . . . . . . . .

105

C1164, C1165 CV SYSTEM . . . . . . . .

106

DTC Logic . . . . . . . . . . . . . . . .

106

Diagnosis Procedure . . . . . . . . . . . .

106

C1166, C1167 SV SYSTEM . . . . . . . .

108

DTC Logic . . . . . . . . . . . . . . . .

108

Diagnosis Procedure . . . . . . . . . . . .

108

C1170 VARIANT CODING . . . . . . . ...

110

DTC Logic . . . . . . . . . . . . . . . .

110

Diagnosis Procedure . . . . . . . . . . . .

110

C118E ACCUMULATOR . . . . . . . . ..

111

DTC Logic . . . . . . . . . . . . . . . .

111

Diagnosis Procedure . . . . . . . . . . . .

111

U1000 CAN COMM CIRCUIT . . . . . . ...

112

Description . . . . . . . . . . . . . . .

112

DTC Logic . . . . . . . . . . . . . . . .

112

Diagnosis Procedure . . . . . . . . . . . .

112

POWER SUPPLY AND GROUND CIRCUIT .

113

Description . . . . . . . . . . . . . . .

113

Diagnosis Procedure . . . . . . . . . . . .

113

PARKING BRAKE SWITCH . . . . . . . .

117

Component Function Check . . . . . . . . .

117

Diagnosis Procedure . . . . . . . . . . . .

117

Component Inspection . . . . . . . . . . ..

118

BRC-3

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BRC

N

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VDC OFF SWITCH . . . . . . . . . . ...

119

Component Function Check . . . . . . . . ..

119

Diagnosis Procedure . . . . . . . . . . . .

119

Component Inspection . . . . . . . . . . ..

120

ABS WARNING LAMP . . . . . . . . . .

122

Component Function Check . . . . . . . . ..

122

Diagnosis Procedure . . . . . . . . . . . .

122

BRAKE WARNING LAMP . . . . . . . ...

123

Component Function Check . . . . . . . . ..

123

Diagnosis Procedure . . . . . . . . . . . .

123

VDC WARNING LAMP . . . . . . . . . .

125

Component Function Check . . . . . . . . ..

125

Diagnosis Procedure . . . . . . . . . . . .

125

VDC OFF INDICATOR LAMP . . . . . . ..

126

Component Function Check . . . . . . . . ..

126

Diagnosis Procedure . . . . . . . . . . . .

126

SYMPTOM DIAGNOSIS . . . . . . .

127

EXCESSIVE OPERATION FREQUENCY . .

127

Description . . . . . . . . . . . . . . .

127

Diagnosis Procedure . . . . . . . . . . . .

127

UNEXPECTED BRAKE PEDAL REACTION ...

128

Description . . . . . . . . . . . . . . .

128

Diagnosis Procedure . . . . . . . . . . . .

128

THE BRAKING DISTANCE IS LONG . . . ..

129

Description . . . . . . . . . . . . . . .

129

Diagnosis Procedure . . . . . . . . . . . .

129

DOES NOT OPERATE . . . . . . . . . .

130

Description . . . . . . . . . . . . . . .

130

Diagnosis Procedure . . . . . . . . . . . .

130

BRAKE PEDAL VIBRATION OR OPERA-
TION SOUND OCCURS . . . . . . . . ...

131

Description . . . . . . . . . . . . . . .

131

Diagnosis Procedure . . . . . . . . . . . .

131

VEHICLE JERKS DURING . . . . . . . ..

132

Description . . . . . . . . . . . . . . .

132

Diagnosis Procedure . . . . . . . . . . . .

132

NORMAL OPERATING CONDITION . . . ...

133

Description . . . . . . . . . . . . . . .

133

REMOVAL AND INSTALLATION . . . .

134

WHEEL SENSOR . . . . . . . . . . . .

134

FRONT WHEEL SENSOR . . . . . . . . . ...

134

FRONT WHEEL SENSOR : Exploded View . . .

134

FRONT WHEEL SENSOR : Removal and Instal-
lation . . . . . . . . . . . . . . . . . ..

134

REAR WHEEL SENSOR . . . . . . . . . . .

135

REAR WHEEL SENSOR : Exploded View . . ...

135

REAR WHEEL SENSOR : Removal and Installa-
tion . . . . . . . . . . . . . . . . . . .

135

SENSOR ROTOR . . . . . . . . . . .

136

FRONT SENSOR ROTOR . . . . . . . . . ...

136

FRONT SENSOR ROTOR : Removal and Instal-
lation . . . . . . . . . . . . . . . . . ..

136

REAR SENSOR ROTOR . . . . . . . . . . .

136

REAR SENSOR ROTOR : Removal and Installa-
tion . . . . . . . . . . . . . . . . . . .

136

ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) . . . . . . . . . . ...

137

Removal and Installation . . . . . . . . . ...

137

YAW RATE/SIDE/DECEL G SENSOR . . ...

138

Exploded View . . . . . . . . . . . . . ...

138

Removal and Installation . . . . . . . . . ...

138

STEERING ANGLE SENSOR . . . . . . .

139

Removal and Installation . . . . . . . . . ...

139

VDC OFF SWITCH . . . . . . . . . . ..

140

Removal and Installation . . . . . . . . . ...

140

BRAKE ASSIST (WITH PREVIEW FUNC-

TION)

PRECAUTION . . . . . . . . . . .

141

PRECAUTIONS . . . . . . . . . . . ...

141

Precautions for Preview Function Service . . . .

141

SYSTEM DESCRIPTION . . . . . . ...

142

COMPONENT PARTS . . . . . . . . .

142

Component Parts Location . . . . . . . . .

142

Component Description . . . . . . . . . . .

143

SYSTEM . . . . . . . . . . . . . . ..

145

BRAKE ASSIST (WITH PREVIEW FUNCTION) . .

145

BRAKE ASSIST (WITH PREVIEW FUNCTION) :
System Description . . . . . . . . . . . .

145

DTC/CIRCUIT DIAGNOSIS . . . . . ...

146

BRAKE ASSIST (WITH PREVIEW FUNC-
TION) . . . . . . . . . . . . . . . ...

146

Diagnosis Procedure . . . . . . . . . . . .

146

SYMPTOM DIAGNOSIS . . . . . . .

147

NORMAL OPERATING CONDITION . . . .

147

Description . . . . . . . . . . . . . . . .

147

INTELLIGENT BRAKE ASSIST

PRECAUTION . . . . . . . . . . .

148

PRECAUTIONS . . . . . . . . . . . ...

148

Precautions for IBA System Service . . . . . ..

148

BRC-4

SYSTEM DESCRIPTION . . . . . . ...

149

COMPONENT PARTS . . . . . . . . . .

149

Component Parts Location . . . . . . . . .

149

Component Description . . . . . . . . . . .

150

SYSTEM . . . . . . . . . . . . . . ...

152

INTELLIGENT BRAKE ASSIST . . . . . . . ..

152

INTELLIGENT BRAKE ASSIST : System Descrip-
tion . . . . . . . . . . . . . . . . . . .

152

DTC/CIRCUIT DIAGNOSIS . . . . . .

154

INTELLIGENT BRAKE ASSIST . . . . . ..

154

Diagnosis Procedure . . . . . . . . . . . .

154

SYMPTOM DIAGNOSIS . . . . . . ...

155

SWITCH DOES NOT TURN ON / SWITCH
DOES NOT TURN OFF . . . . . . . . .

155

Symptom Table . . . . . . . . . . . . . .

155

Description . . . . . . . . . . . . . . .

155

Diagnosis Procedure . . . . . . . . . . . .

155

NORMAL OPERATING CONDITION . . . ...

157

Description . . . . . . . . . . . . . . .

157

REMOVAL AND INSTALLATION . . . .

158

IBA OFF SWITCH . . . . . . . . . . . .

158

Removal and Installation . . . . . . . . . ...

158