INFINITI QX56 2009 Factory Service Manual

BRC-34
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1105, C1106, C1107,
C1108 WHEEL SENSOR-2
Is the inspection result normal?
YES >> Replace the ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Instal-
lation".
NO >> Repair the circuit.
Component InspectionINFOID:0000000003772509
1.CHECK DATA MONITOR
On “DATA MONITOR”, select “FR LH SENSOR”, “FR RH SENSOR”, “RR LH SENSOR”, and “RR RH SEN-
SOR”, and check the vehicle speed.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-32, "
Diagnosis Procedure".
Special Repair RequirementINFOID:0000000003772510
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
Wheel sensor ABS actuator and
electric unit (control unit) Wheel sensor
Continuity
Connector Terminal Connector Terminal
Front LH
E12545
E18 1
Ye s
46
2
Front RH 34
E117 1
33 2
Rear LH 37
C11 2
36 1
Rear RH 42
C10 2
43 1
Wheel sensorVehicle speed (DATA MONITOR)
FR LH SENSOR
Nearly matches the speedometer dis-
play (±10% or less)
FR RH SENSOR
RR LH SENSOR
RR RH SENSOR
Revision: December 20092009 QX56

C1109 POWER AND GROUND SYSTEMBRC-35
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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C1109 POWER AND GROUND SYSTEM
DescriptionINFOID:0000000003772511
Supplies electric power to the ABS ac tuator and electric unit (control unit).
DTC LogicINFOID:0000000003772512
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-35, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000003772513
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
4. Reconnect connectors and then perform the self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is any item indicated on the self-diagnosis display?
YES >> GO TO 2
NO >> Poor connection of connector terminal. Repair or replace connector.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (C ONTROL UNIT) POWER SUPPLY CIRCUIT AND
GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Turn ignition switch ON or OFF and check voltage between ABS
actuator and electric unit (control unit) harness connector termi-
nal and ground.
4. Turn ignition switch OFF.
DTC Display item Malfunction detected condition Possible cause
C1109 BATTERY VOLTAGE
[ABNORMAL] When the ABS actuator and electric unit (control unit)
power supply voltage is lower than normal. • Harness or connector
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
BATTERY VOLTAGE [ABNORMAL]
ABS actuator and elec- tric unit (control unit) —Condition Voltage
Connector Terminal
E125 4 Ground Ignition switch: ON Battery voltage
Ignition switch: OFF Approx. 0V
AWFIA0015ZZ
Revision: December 20092009 QX56

BRC-36
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1109 POWER AND GROUND SYSTEM
5. Check continuity between ABS actuator and electric unit (control
unit) harness connector terminals and ground.
Is the inspection result normal?
YES >> Check battery for terminal looseness, low voltage, etc. If any malfunction is found, repair malfunc-
tioning parts.
NO >> Repair or replace malfunctioning components.
Special Repair RequirementINFOID:0000000003772514
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
ABS actuator and electric unit (control unit) —Contin u it y
Connector Terminal
E125 16, 47 Ground Yes
AWFIA0016ZZ
Revision: December 20092009 QX56

C1110, C1170 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-37
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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C1110, C1170 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
DTC LogicINFOID:0000000003772515
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-37, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000003772516
INSPECTION PROCEDURE
1.REPLACE ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
>> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "
Removal and Installa-
tion".
Special Repair RequirementINFOID:0000000003772517
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
DTC Display item Malfunction detected condition Possible cause
C1110 CONTROLLER FAILURE When there is an in
ternal malfunction in the ABS actuator
and electric unit (control unit). • ABS actuator and electric unit
(control unit)
C1170 VARIANT CODING In a case where VARIANT CODING is different.
Self-diagnosis results
CONTROLLER FAILURE VARIANT CODING
Revision: December 20092009 QX56

BRC-38
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1111 ABS MOTOR, MOTOR RELAY SYSTEM
C1111 ABS MOTOR, MOTOR RELAY SYSTEM
DescriptionINFOID:0000000003772518
PUMP
The pump returns the brake fluid stored in the reservoi
r to the master cylinder by reducing the pressure.
MOTOR
The motor drives the pump according to the signals trans mitted by the ABS actuator and electric unit (control
unit).
DTC LogicINFOID:0000000003772519
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-38, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000003772520
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Check terminal for deformation, disconnect, looseness, and so on. If any malfunction is found, repair or
replace terminal.
4. Reconnect connectors and then perform the self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is any item indicated on the self-diagnosis display?
YES >> GO TO 2
NO >> Poor connection of connector term inal. Repair or replace connector.
2.CHECK ABS MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
DTCDisplay item Malfunction detected condition Possible cause
C 1111 P U M P M O T O R During the actuator motor operating with ON, when the
actuator motor turns OFF, or when the control line for ac-
tuator motor relay is open.
• Harness or connector
• ABS actuator and electric unit
(control unit)
During the actuator motor operating with OFF, when the
actuator motor turns ON, or when the control line for relay
is shorted to ground.
Self-diagnosis results
PUMP MOTOR
Revision: December 20092009 QX56

C1111 ABS MOTOR, MOTOR RELAY SYSTEM
BRC-39
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connec- tor.
3. Check voltage between the ABS actuator and electric unit (con- trol unit) harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace malfunctioning components.
3.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
Check continuity between ABS act uator and electric unit (control
unit) harness connector terminals and ground.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "
Removal and Installation".
NO >> Repair or replace malfunctioning components.
Component InspectionINFOID:0000000003772521
1.CHECK ACTIVE TEST
1. On “ACTIVE TEST”, select “ABS MOTOR”.
2. Touch ON and OFF on screen. Make sure motor relay and actuator relay operates as shown in table below.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-38, "
Diagnosis Procedure".
Special Repair RequirementINFOID:0000000003772522
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
ABS actuator and electric unit (control unit) —Volt a ge
Connector Terminal
E125 1Ground Battery voltage
AWFIA0017ZZ
ABS actuator and electric unit (control unit)
—Contin u it y
Connector Terminal
E125 16, 47GroundYes
AWFIA0016ZZ
Operation ONOFF
MOTOR RELAY ONOFF
ACTUATOR RLY ONON
Revision: December 20092009 QX56

BRC-40
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1113, C1145, C1146 YAW
RATE/SIDE/DECEL G SENSOR
C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
DescriptionINFOID:0000000003772523
The yaw rate/side/decel G sensor detects the yaw rate /side/decel G affecting the vehicle, and transmits the
data to the ABS actuator and electric uni t (control unit) as an analog voltage signal.
DTC LogicINFOID:0000000003772524
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-40, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000003772525
CAUTION:
• Sudden turns (such as spin turns, acceleration turns), drifting, etc. when VDC function is OFF may
cause the yaw rate/side/decel G senso r system to indicate a malfunction. This is not a malfunction if
normal operation can be resumed after restarting the engine.
• If vehicle is on turn table at entrance to parkin g garage, or on other moving surface, VDC OFF indica-
tor lamp may illuminate and CONSULT-III self-dia gnosis may indicate yaw rate sensor system mal-
function. However, in this case there is no malfunction in yaw rate sensor system. Take vehicle off of
turn table or other moving surface, and st art engine. Results will return to normal.
INSPECTION PROCEDURE
1.CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit (control unit) connector E125 and yaw rate/side/decel G sensor
connector M108.
Check the terminals for deformation, disconnection, looseness or damage.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace as necessary.
2.YAW RATE/SIDE/DECEL G SENSOR HARNESS INSPECTION
DTC Display item Malfunction detected condition Possible cause
C1113 G-SENSOR Longitudinal G-sensor is malfunctioning, or signal line of
longitudinal G-sensor is open or shorted.
• Harness or connector
• ABS actuator and electric unit
(control unit)
• Yaw rate/side/decel G sensor
C1145 YAW RATE SENSOR
Yaw rate sensor is malfunctioning, or the yaw rate sensor
signal line is open or shorted.
C1146 SIDE G-SEN CIRCUIT Side G sensor is malfunctioning, or circuit of side G sen-
sor is open or shorted.
Self-diagnosis results
G-SENSOR
YAW RATE SENSOR
SIDE G-SEN CIRCUIT
Revision: December 20092009 QX56

C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
BRC-41
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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Check continuity between the ABS ac tuator and electric unit (control
unit) connector E125 (A) and the yaw rate/side/decel G sensor con-
nector M108 (B).
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace as necessary.
3.YAW RATE/SIDE/DECEL G SENSOR INSPECTION
1. Connect the yaw rate/side/decel G sensor connecto r M108 and ABS actuator and electric unit (control
unit) connector E125.
2. Use “DATA MONITOR” to check if the yaw rate/side/decel G sensor signals are normal.
Is the inspection result normal?
YES >> Replace the ABS actuator and elec tric unit (control unit). Refer to BRC-116, "Removal and Instal-
lation".
NO >> Replace the yaw rate/side/decel G sensor. Refer to BRC-119, "
Removal and Installation".
Component InspectionINFOID:0000000003772526
1.CHECK DATA MONITOR
Select “YAW RATE SEN”, “SIDE G-SENSOR”, “DECEL G-SEN” in “DATA MONITOR” and check yaw rate/
side/decel G sensor signal.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-40, "
Diagnosis Procedure".
Special Repair RequirementINFOID:0000000003772527
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
ABS actuator and electric unit
(control unit) Yaw rate/side/decel G sensor
Continuity
Connector Terminal Connector Terminal
A: E125 6
B: M108 3
Ye s
24
5
25 1
29 2
AWFIA0024ZZ
Vehicle conditionYAW RATE SEN
(DATA MONITOR) SIDE G-SENSOR
(DATA MONITOR) DECEL G-SEN
(DATA MONITOR)
Stopped -4 to +4 deg/s -1.1 to +1.1 m/s-0.11 G to +0.11 G
Turning right Negative value Negative value -
Turning left Positive value Positive value -
Speed up --Negative value
Speed down --Positive value
Vehicle condition YAW RATE SEN
(DATA MONITOR) SIDE G-SENSOR
(DATA MONITOR) DECEL G-SEN
(DATA MONITOR)
Stopped -4 to +4 deg/s -1.1 to +1.1 m/s-0.11 G to +0.11 G
Turning right Negative value Negative value -
Turning left Positive value Positive value -
Speed up --Negative value
Speed down --Positive value
Revision: December 20092009 QX56

BRC-42
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1113, C1145, C1146 YAW
RATE/SIDE/DECEL G SENSOR
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
Revision: December 20092009 QX56

C1115 WHEEL SENSORBRC-43
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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C1115 WHEEL SENSOR
DescriptionINFOID:0000000003772528
When the sensor rotor rotates, the magnetic field c hanges. It converts the magnetic field changes to current
signals (rectangular wave) and transmits them to t he ABS actuator and electric unit (control unit).
DTC LogicINFOID:0000000003772529
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-43, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000003772530
CAUTION:
Do not check between wheel sensor terminals.
INSPECTION PROCEDURE
1.CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit (control unit) connector E125 and wheel sensor of malfunction-
ing code.
Check the terminals for deformation, disconnection, looseness or damage.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace as necessary.
2.CHECK WHEEL SENSOR OUTPUT SIGNAL
1. Connect ABS active wheel sensor tester (J- 45741) to wheel sensor using appropriate adapter.
2. Turn on the ABS active wheel sensor tester power switch.
NOTE:
The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the
battery in the ABS active wheel sensor tester before proceeding.
3. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel
sensor tester. The red SENSOR indicator should flash on and off to indicate an output signal.
NOTE:
If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and
retest.
Does the ABS active wheel s ensor tester detect a signal?
YES >> GO TO 3
NO >> Replace the wheel sensor. Refer to BRC-114, "
Removal and Installation".
3.CHECK TIRES
DTCDisplay item Malfunction detected condition Possible cause
C 111 5 ABS SENSOR
[ABNORMAL SIGNAL] When wheel sensor input signal is malfunctioning. • Harness or connector
• Wheel sensor
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
ABS SENSOR [ABNORMAL SIGNAL]
Revision: December 20092009 QX56