INFINITI QX56 2011 Factory Service Manual

BRC-44
< SYSTEM DESCRIPTION >[WITH VDC]
DIAGNOSIS SYSTEM [
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
*: Immediately after being selected, status is “O n”. Status changes to “Off” after approx. 2 seconds.
Stop Lamp ON Relay
When “On” or “Off” is selected on display screen, t he following items are displayed when system is normal.
NOTE:
Display occasionally changes On/Off for a moment after ignition switch is turned ON. This is operation for
checking purposes and is not a malfunction.
WORK SUPPORT
Test item Display Item Display
On Off
STOP LAMP ON RELAY STOP LAMP ON RELAY On Off
Conditions Description
ST ANGLE SENSOR ADJUSTMENT Perform neutral position adjustment of steering angle sensor.
DECEL G SENSOR CALIBRATION Perform decel G sensor calibration.
Revision: 2010 May2011 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-45
< ECU DIAGNOSIS INFORMATION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
ECU DIAGNOSIS INFORMATION
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Reference ValueINFOID:0000000006222579
CONSULT-III DATA MONITOR STANDARD VALUE
Monitor item Condition Reference values in normal operation
FR LH SENSOR Vehicle stopped 0.00 km/h (MPH)
When driving
(Note 1)Nearly matches the speedometer dis-
play (within
±10%)
FR RH SENSOR Vehicle stopped 0.00 km/h (MPH)
When driving
(Note 1)Nearly matches the speedometer dis-
play (within
±10%)
RR LH SENSOR Vehicle stopped 0.00 km/h (MPH)
When driving
(Note 1)Nearly matches the speedometer dis-
play (within
±10%)
RR RH SENSOR Vehicle stopped 0.00 km/h (MPH)
When driving
(Note 1)Nearly matches the speedometer dis-
play (within
±10%)
DECEL G-SEN When stopped Approx. 0 G
During acceleration Positive value
During deceleration Negative value
FR RH IN SOL Active On
Inactive Off
FR RH OUT SOL Active On
Inactive Off
FR LH IN SOL Active On
Inactive Off
FR LH OUT SOL Active On
Inactive Off
RR RH IN SOL Active On
Inactive Off
RR RH OUT SOL Active On
Inactive Off
RR LH IN SOL Active On
Inactive Off
RR LH OUT SOL Active On
Inactive Off
EBD WARN LAMP When brake warning lamp is ON
(Note 2)On
When brake warning lamp is OFF
(Note 2)Off
STOP LAMP SW Brake pedal depressed On
Brake pedal not depressed Off
MOTOR RELAY Active On
Inactive Off
ACTUATOR RLY Active On
Inactive (in fail-safe mode) Off
Revision: 2010 May2011 QX56

BRC-46
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
ABS WARN LAMPWhen ABS warning lamp is ON
(Note 2)On
When ABS warning lamp is OFF
(Note 2)Off
OFF LAMP When VDC OFF indicator lamp is ON
(Note 2)On
When VDC OFF indicator lamp is OFF
(Note 2)Off
OFF SW VDC OFF switch ON On
VDC OFF switch OFF Off
SLIP/VDC LAMP When VDC warning lamp is ON or Blinking
(Note 2)On
When VDC warning lamp is OFF
(Note 2)Off
BATTERY VOLT Ignition switch ON 10 – 16 V
GEAR Driving 1 – 7
Depending on shift status
ENGINE SPEED Engine stopped 0 tr/min
Engine running Almost same reading as tachometer
YAW RATE SEN Vehicle stopped Approx. 0 d/s
Turning right Negative value
Turning left Positive value
R POSI SIG When selector lever is in the R position On
When selector lever is in the other position than R Off
4WD MODE MON
(Note 3)
When 4WD sift switch is AUTO position AUTO
When 4WD sift switch is 4H position LOCK
When 4WD sift switch is 4L position ##
N POSI SIG When selector lever is in the N position On
When selector lever is in the other position than N Off
CV1 Active On
Inactive Off
CV2 Active On
Inactive Off
SV1 Active On
Inactive Off
SV2 Active On
Inactive Off
STOP LAMP SW2 Brake pedal depressed On
Brake pedal not depressed Off
ACCEL POS SIG Never depress accelerator pedal
(with ignition switch ON)
0%
Depress accelerator pedal
(with ignition switch ON) 0 – 100%
SIDE G-SENSOR Vehicle stopped
Approx. 0 m/s
2
Right turn Negative value
Left turn Positive value
STR ANGLE SIG When driving straight 0
±2.5 °
When steering wheel is steered to LH by 90 °Approx. +90 °
When steering wheel is steered to RH by 90 °Approx. –90 °
Monitor item Condition Reference values in normal operation
Revision: 2010 May2011 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-47
< ECU DIAGNOSIS INFORMATION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Note 1: Confirm tire pressure is standard value.
Note 2: Refer to BRC-16, "
System Description" for ON/Blinking/OFF conditions of each warning lamp and indi-
cator lamp.
Note 3: Models with 4WD System
Note 4: Models with Advanced Driver Assistance System
Note 5: USS means “hill start assist”.
Fail-safeINFOID:0000000006222580
VDC FUNCTION, TCS FUNCTION, hill start assi st FUNCTION AND BRAKE LIMITED SLIP DIFFER-
ENTIAL (BLSD) FUNCTION
VDC warning lamp in combination meter turn ON w hen a malfunction occurs in system [ABS actuator and
electric unit (control unit)]. The control is suspended for VDC function, TCS function, hill start assist function
and brake limited slip differential (BLSD) function. T he Vehicle status becomes the same as models without
PRESS SENSORBrake pedal not depressed Approx. 0 bar
Brake pedal depressed (
−40) – (+300) bar
ACCUM PRESS SEN With ig nition switch ON Approx. 0 – 210 bar (Proportional to the
amount of accumulated pressure in the
accumulator)
CONT PRESS SEN
(Note 4)Brake pedal not depressed Approx. 0 bar
Brake pedal depressed ( −40) – (+300) bar
EBD SIGNAL EBD is active On
EBD is inactive Off
ABS SIGNAL ABS is active On
ABS is inactive Off
TCS SIGNAL TCS is active On
TCS is inactive Off
VDC SIGNAL VDC is active On
VDC is inactive Off
EBD FAIL SIG In EBD fail-safe On
EBD is normal Off
ABS FAIL SIG In ABS fail-safe On
ABS is normal Off
TCS FAIL SIG In TCS fail-safe On
TCS is normal Off
VDC FAIL SIG In VDC fail-safe On
VDC is normal Off
CRANKING SIG At cranking On
Other than at cranking Off
FLUID LEV SW When brake fluid level switch is ON (brake fluid level
is less than the specified level)
On
When brake fluid level switch is OFF Off
PARK BRAKE SW When parking brake is active On
Parking brake is released Off
STP ON RLY Stop lamp relay is active On
Stop lamp relay is inactive Off
USS SIG
(Note 5)hill start assist is active On
hill start assist is inactive Off
Monitor item Condition Reference values in normal operation
Revision: 2010 May2011 QX56

BRC-48
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
VDC function, TCS function, hill start assist function and
brake limited slip differential (BLSD) function. How-
ever, ABS function and EBD function are operated normally.
ABS FUNCTION
ABS warning lamp and VDC warning lamp in combinati on meter turn ON when a malfunction occurs in system
[ABS actuator and electric unit (control unit)]. The c ontrol is suspended for VDC function, TCS function, ABS
function, hill start assist function and brake limited sl ip differential (BLSD) function. The vehicle status
becomes the same as models without VDC function, TCS f unction, ABS function, hill start assist function and
brake limited slip differential (BLSD) function. However, EBD function is operated normally.
NOTE:
ABS self-diagnosis sound may be heard the same as in the normal condition, because self-diagnosis is per-
formed when ignition switch turns ON and when vehicle initially starts.
EBD FUNCTION
ABS warning lamp, brake warning lamp and VDC warning lamp in combination meter turn ON when a mal-
function occurs in system [ABS actuator and electric unit (control unit)]. The control is suspended for VDC
function, TCS function, ABS function, EBD function, hill start assist function and brake limited slip differential
(BLSD) function. The vehicle status becomes the sa me as models without VDC function, TCS function, ABS
function, EBD function, hill star t assist function and brake limited slip differential (BLSD) function.
DTC Malfunction detected condition Fail-safe condition
C1101 When an open circuit is detected in rear RH wheel sensor circuit.
The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function (only when both 2 rear wheels are malfunctioning)
 hill start assist function
 Brake limited slip differential (BLSD) function
C1102 When an open circuit is detected in rear LH wheel sensor circuit.
C1103 When an open circuit is detected in front RH wheel sensor circuit.
C1104 When an open circuit is detected in front LH wheel sensor circuit.
C1105
 When power supply voltage of rear RH wheel sensor is low.
 When distance between rear RH wheel sensor and rear RH wheel sensor rotor is
large.
 When installation of rear RH wheel sensor or rear RH wheel sensor rotor is not normal.
C1106  When power supply voltage of rear LH wheel sensor is low.
 When distance between rear LH wheel sensor and rear LH wheel sensor rotor is
large.
 When installation of rear LH wheel sensor or rear LH wheel sensor rotor is not nor-
mal.
C1107  When power supply voltage of front RH wheel sensor is low.
 When distance between front RH wheel sensor and front RH wheel sensor rotor
is large.
 When installation of front RH wheel sensor or front RH wheel sensor rotor is not normal.
C1108  When power supply voltage of front LH wheel sensor is low.
 When distance between front LH wheel sensor and front LH wheel sensor rotor is
large.
 When installation of front LH wheel sensor or front LH wheel sensor rotor is not normal.
C1109  When ignition voltage is 10 V or less.
 When ignition voltage is 16 V or more. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C 1111
 When a malfunction is detected in motor or motor relay.
 When a low pressure malfunction is detected in accumulator.
 When a malfunction is detected in accumulator pressure sensor.
Revision: 2010 May2011 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-49
< ECU DIAGNOSIS INFORMATION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C 111 5 When difference in wheel speed between any wheel and others is detected during
the vehicle is driven, because of installation of other tires than specified. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C 111 6
 When stop lamp switch signal is not input when brake pedal depress.
 When stop lamp switch signal is not input when stop lamp relay operates.
C 111 8
*1When a malfunction is detected in transfer control unit system.
C1120 When a malfunction is detec ted in front LH ABS IN valve.
The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential (BLSD) function
C1121 When a malfunction is detec
ted in front LH ABS OUT valve.
C1122 When a malfunction is detected in front RH ABS IN valve.
C1123 When a malfunction is det ected in front RH ABS OUT valve.
C1124 When a malfunction is detected in rear LH ABS IN valve.
C1125 When a malfunction is detected in rear LH ABS OUT valve.
C1126 When a malfunction is det ected in rear RH ABS IN valve.
C1127 When a malfunction is detected in rear RH ABS OUT valve.
C1130 When a malfunction is detected in ECM system. The following functions are sus-
pended.
 VDC function
 TCS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1140 When a malfunction is detected in actuator relay. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1142
*2When a malfunction is detected in master cylinder pressure sensor or control pres-
sure sensor. The following functions are sus-
pended.
 VDC function
 TCS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1143 When a malfunction is detected in steering angle sensor.
C1144 When neutral position adjustment of steering angle sensor is not complete.
C1145
 When a malfunction is detected in yaw rate signal.
 When yaw rate signal is not continuously received for 2 seconds or more.
 When side G signal is not continuously received for 2 seconds or more.
 When decel G signal is not continuously received for 2 seconds or more.
The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C1146 When a malfunction is detected in side/decel G signal.
C1155
 When brake fluid level low signal is detected.
 When an open circuit is detected in brake fluid level switch circuit.
C1160 When calibration of yaw rate/side/decal G sensor is not complete.
C1164 When a malfunction is detected in cut valve 1. The following functions are sus- pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential (BLSD) function
C1165 When a malfunction is detected in cut valve 2.
C1166 When a malfunction is detected in suction valve 1.
C1167 When a malfunction is detected in suction valve 2. DTC Malfunction detected condition Fail-safe condition
Revision: 2010 May2011 QX56

BRC-50
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
*1: Models with 4WD System
*2: Models with Advanced Driver Assistance System
Protection FunctionINFOID:0000000006222581
The VDC warning lamp, ABS warning lamp and brake warning lamp turns ON and DTC “C118E” may be
detected in self-diagnosis result of “ABS” when the br
ake pedal is excessively operated, such as air bleeding.
This is not a system malfunction because this occurs due to the temporary decrease in accumulator fluid pres-
sure. The system returns to normal condition when the accu mulator fluid pressure reaches the specified pres-
sure with the ignition switch ON and the VDC warning lamp, ABS warning lamp, and brake warning lamp turn
OFF. After these steps, erase self-diagnos is results for “ABS” with CONSULT-III.
NOTE:
D T C “ C 1111 ” i s d e t e c t e d i n s e l f - d i agnosis results of “ABS” when the a ccumulator system has a malfunction.
DTC Inspection Priority ChartINFOID:0000000006222582
When multiple DTCs are displayed simultaneously, check one by one depending on the following priority list.
C1170 When the information in ABS actuator and electric unit (control unit) is not the same. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C118E When performing excessive brake pedal operation with the vehicle stopped. [When
accumulator fluid pressure reaches 11.43 MPa (114 bar, 116.6 kg/cm
2, 1657 psi) af-
ter reaching 17.3 MPa (173 bar, 176.5 kg/cm2, 2509 psi.] The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential
(BLSD) function
U1000 When CAN communication signal is not continuously received for 2 seconds or
more. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
DTC Malfunction detected condition Fail-safe condition
DTC
 VDC warning lamp
 ABS warning lamp
 Brake warning lamp Condition Description protection function
C118E ON When temporary decrease in accumulator fluid pres-
sure.
NOTE:
System is not malfunction. The following functions are suspended
temporarily
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential (BLSD)
function
Priority Detected item (DTC)
1  U1000 CAN COMM CIRCUIT
2  C1170 VARIANT CODING
Revision: 2010 May2011 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-51
< ECU DIAGNOSIS INFORMATION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
*: Models with 4WD system
DTC IndexINFOID:0000000006222583
3  C1118 4WD SYSTEM
*
 C1130 ENGINE SIGNAL 1
 C1144 ST ANG SEN SIGNAL
4  C1109 BATTERY VOLTAGE [ABNORMAL]
 C 1111 P U M P M O T O R
C1140 ACTUATOR RLY
5  C1101 RR RH SENSOR-1
 C1102 RR LH SENSOR-1
 C1103 FR RH SENSOR-1
 C1104 FR LH SENSOR-1
 C1105 RR RH SENSOR-2
 C1106 RR LH SENSOR-2
 C1107 FR RH SENSOR-2
 C1108 FR LH SENSOR-2
 C1115 ABS SENSOR [ABNORMAL SIGNAL]
 C1116 STOP LAMP SW
 C1120 FR LH IN ABS SOL
 C1121 FR LH OUT ABS SOL
 C1122 FR RH IN ABS SOL
 C1123 FR RH OUT ABS SOL
 C1124 RRLH IN ABS SOL
 C1125 RR LH OUT ABS SOL
 C1126 RR RH IN ABS SOL
 C1127 RR RH OUT ABS SOL
 C1142 PRESS SEN CIRCUIT
 C1143 ST ANG SEN CIRCUIT
 C1145 YAW RATE SENSOR
 C1146 SIDE G-SEN CIRCUIT
 C1160 DECEL G SEN SET
C1164 CV 1
C1165 CV 2
 C1166 SV 1
 C1167 SV 2
6  C1155 BR FLUID LEVEL LOW
 C118E ACCUMULATOR PRESS
Priority Detected item (DTC)
DTC Items (CONSULT screen terms) Reference
C1101 RR RH SENSOR-1
BRC-68, "
DTC Logic"C1102 RR LH SENSOR-1
C1103 FR RH SENSOR-1
C1104 FR LH SENSOR-1
C1105 RR RH SENSOR-2BRC-70, "
DTC Logic"C1106 RR LH SENSOR-2
C1107 FR RH SENSOR-2
C1108 FR LH SENSOR-2
C1109 BATTERY VOLTAGE [ABNORMAL]BRC-72, "
DTC Logic"
C 1111 P U M P M O T O RBRC-75, "DTC Logic"
C1115 ABS SENSOR [ABNORMAL SIGNAL] BRC-77, "DTC Logic"
C1116 STOP LAMP SWBRC-79, "DTC Logic"
C 111 8*4WD SYSTEMBRC-87, "DTC Logic"
C1120 FR LH IN ABS SOL BRC-88, "DTC Logic"
Revision: 2010 May2011 QX56

BRC-52
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
*: Models with 4WD system
C1121 FR LH OUT ABS SOL
BRC-90, "DTC Logic"
C1122 FR RH IN ABS SOLBRC-88, "DTC Logic"
C1123 FR RH OUT ABS SOLBRC-90, "DTC Logic"
C1124 RRLH IN ABS SOLBRC-88, "DTC Logic"
C1125 RR LH OUT ABS SOLBRC-90, "DTC Logic"
C1126 RR RH IN ABS SOLBRC-88, "DTC Logic"
C1127 RR RH OUT ABS SOLBRC-90, "DTC Logic"
C1130 ENGINE SIGNAL 1BRC-92, "DTC Logic"
C1140 ACTUATOR RLYBRC-93, "DTC Logic"
C1142 PRESS SEN CIRCUITBRC-95, "DTC Logic"
C1143 ST ANG SEN CIRCUITBRC-97, "DTC Logic"
C1144 ST ANG SEN SIGNALBRC-99, "DTC Logic"
C1145 YAW RATE SENSOR
BRC-100, "DTC Logic"C1146 SIDE G-SEN CIRCUIT
C1155 BR FLUID LEVEL LOWBRC-103, "
DTC Logic"
C1160 DECEL G SEN SETBRC-105, "DTC Logic"
C1164 CV 1
BRC-106, "DTC Logic"C1165 CV 2
C1166 SV 1BRC-108, "
DTC Logic"C1167 SV 2
C1170 VARIANT CODING BRC-110, "
DTC Logic"
C118E ACCUMULATOR PRESS BRC-111, "DTC Logic"
U1000 CAN COMM CIRCUITBRC-112, "DTC Logic"
DTC Items (CONSULT screen terms) Reference
Revision: 2010 May2011 QX56

BRAKE CONTROL SYSTEMBRC-53
< WIRING DIAGRAM > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
WIRING DIAGRAM
BRAKE CONTROL SYSTEM
Wiring DiagramINFOID:0000000006222584
JCFWM0627GB
Revision: 2010 May2011 QX56