2007 INFINITI QX56 service

TROUBLE DIAGNOSES FOR SYMPTOMS
BRC-53
< SERVICE INFORMATION >[VDC/TCS/ABS]
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Component InspectionINFOID:0000000003532808
VDC OFF SWITCH
Check the continuity between terminals 1 and 2.
1 - 2 : Continuity should exist when pushing the
switch.
Continuity should not exist when releasing
the switch.
PFIA0307E

BRC-54
< SERVICE INFORMATION >[VDC/TCS/ABS]
ON-VEHICLE SERVICE
ON-VEHICLE SERVICE
Adjustment of Steering Angle Sensor Neutral PositionINFOID:0000000003532809
After removing/installing or replacing ABS actuator and electric unit (control unit), steering angle sensor, steer-
ing and suspension components which affect wheel alignment or after adjusting wheel alignment, be sure to
adjust neutral position of steering angle sensor before running vehicle.
NOTE:
Adjustment of steering angle sensor neutral position requires CONSULT-II.
1. Stop vehicle with front wheels in straight-ahead position.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data
link connector on vehicle, and turn ignition switch ON (do not
start engine).
3. Touch “START (NISSAN BASED VHCL)”, “ABS”, “WORK SUP-
PORT” and “ST ANGLE SENSOR ADJUSTMENT” on CON-
SULT-II screen in this order.
4. Touch “START”.
CAUTION:
Do not touch steering wheel while adjusting steering angle
sensor.
5. After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)
6. Turn ignition switch OFF, then turn it ON again.
7. Run vehicle with front wheels in straight-ahead position, then
stop.
8. Select “DATA MONITOR”, “SELECTION FROM MENU”, and
“STR ANGLE SIG” on CONSULT-II screen. Then check that
“STR ANGLE SIG” is within 0±3.5 deg. If value is more than specification, repeat steps 1 to 5.
9. Erase memory of ABS actuator and electric unit (control unit) and ECM.
10. Turn ignition switch to OFF.
Calibration of Decel G SensorINFOID:0000000003532810
After removing/installing or replacing ABS actuator and electric unit (control unit), yaw rate/side/decel G sen-
sor, steering and suspension components which affect wheel alignment or after adjusting wheel alignment, be
sure to calibrate the decel G sensor before running vehicle.
NOTE:
Calibration of decel G sensor requires CONSULT-II.
1. Stop vehicle with front wheels in straight-ahead position.
CAUTION:
• The work should be done on a level area with an unloaded vehicle.
• Keep all the tires inflated to the correct pressures. Adjust the tire pressure to the specified pres-
sure value.
2. Connect CONSULT-II with CONSULT-II CONVERTER to data link connector on vehicle, and turn ignition
switch ON (do not start engine).
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
3. Touch “START (NISSAN BASED VHCL)”, "ABS", "WORK SUPPORT" and "DECEL G SEN CALIBRA-
TION" on CONSULT-II screen in this order. Refer to BRC-26, "
CONSULT-II Function (ABS)".
BBIA0369E
WFIA0239E

ON-VEHICLE SERVICE
BRC-55
< SERVICE INFORMATION >[VDC/TCS/ABS]
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4. Touch "START".
CAUTION:
Set vehicle as shown in the display.
5. After approximately 10 seconds, touch "END". (After approxi-
mately 60 seconds, it ends automatically.)
6. Turn ignition switch OFF, then turn it ON again.
CAUTION:
Be sure to carry out above operation
7. Run vehicle with front wheels in straight-ahead position, then
stop.
8. Select "DATA MONITOR", "SELECTION FROM MENU", and
"DECEL G SEN" on CONSULT-II screen. Then check that "DECEL G SEN" is within ±0.08G. If value is
more than specification, repeat steps 3 to 7.
9. Erase memory of ABS actuator and electric unit (control unit) and ECM.
10. Turn ignition switch to OFF.
SFIA1162E

BRC-56
< SERVICE INFORMATION >[VDC/TCS/ABS]
WHEEL SENSOR
WHEEL SENSOR
Removal and InstallationINFOID:0000000003532811
REMOVAL
1. Remove wheel sensor bolt.
• When removing the front wheel sensor, first remove the disc rotor to gain access to the front wheel sen-
sor bolt. Refer to BR-19, "
Removal and Installation of Brake Caliper and Disc Rotor" .
• When removing the rear wheel sensor, first remove the rear hub and bearing assembly to gain access to
the rear wheel sensor bolt. Refer to FA X - 5 , "
Removal and Installation" .
2. Pull out the sensor, being careful to turn it as little as possible.
CAUTION:
• Do not pull on the sensor harness.
3. Disconnect wheel sensor harness electrical connector, then remove harness from attaching points.
INSTALLATION
Installation is in the reverse order of removal. Tighten wheel sensor bolt to specification.
CAUTION:
Installation should be performed while paying attention to the following.
• Inspect wheel sensor O-ring, replace sensor assembly if damaged.
• Before installing wheel sensor, make sure no foreign materials (such as iron fragments) are adhered
to the pick-up part of the sensor, to the inside of the sensor hole or on the rotor mating surface.
• Apply a coat of suitable grease to the wheel sensor O-ring and hole. Refer to MA-10
.
WFIA0376E

SENSOR ROTOR
BRC-57
< SERVICE INFORMATION >[VDC/TCS/ABS]
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SENSOR ROTOR
Removal and InstallationINFOID:0000000003532812
NOTE:
The wheel sensor rotors are built into the wheel hubs and are not removable. If damaged, replace wheel hub
and bearing assembly. Refer to FAX-5, "
Removal and Installation" (front), RAX-5, "Removal and Installation"
(rear).

BRC-58
< SERVICE INFORMATION >[VDC/TCS/ABS]
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
Removal and InstallationINFOID:0000000003532813
REMOVAL
1. Disconnect the negative battery terminal.
2. Remove the cowl top extension. Refer to EI-17, "
Removal and Installation" .
3. Drain the brake fluid. Refer to BR-8, "
Drain and Refill".
4. Disconnect the actuator harness from the ABS actuator and electric unit (control unit).
CAUTION:
• To remove the brake tubes, use a flare nut wrench to prevent the flare nuts and brake tubes from
being damaged.
• 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.
5. Disconnect the brake tubes.
6. Remove the three bolts and remove the ABS actuator and electric unit (control unit).
INSTALLATION
Installation is in the reverse order of removal.
NOTE:
To install, use a flare nut wrench (commercial service tool). Tighten brake tubes to specification when install-
ing. Refer to BR-10, "
Hydraulic Circuit" .
1. To left front 2. To rear right 3. To rear left
4. To front right 5. From the master cylinder secondary
side6. From the master cylinder primary
side
7. ABS actuator and electric unit (con-
trol unit)8. Harness connector
WFIA0375E

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
BRC-59
< SERVICE INFORMATION >[VDC/TCS/ABS]
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• After installation of the ABS actuator and electric unit (control unit), refill the brake system with new brake
fluid. Refer to MA-10
. Then bleed the air from the system. Refer to BR-8, "Bleeding Brake System" .
CAUTION:
• Never reuse drained brake fluid.
• Adjust the steering angle sensor. Refer to BRC-54, "
Adjustment of Steering Angle Sensor Neutral
Position" .
• Calibrate the yaw rate/side/decel G sensor. Refer to BRC-54, "
Calibration of Decel G Sensor" .

BRC-60
< SERVICE INFORMATION >[VDC/TCS/ABS]
STEERING ANGLE SENSOR
STEERING ANGLE SENSOR
Removal and InstallationINFOID:0000000003532814
REMOVAL
1. Remove the spiral cable. Refer to SRS-37, "Removal and Installation".
2. Remove the screws and remove the steering angle sensor.
CAUTION:
In the case that the ABS actuator and electronic unit (control unit) is replaced, make sure to adjust
position of steering angle sensor. Refer to BRC-54, "
Adjustment of Steering Angle Sensor Neutral
Position".
INSTALLATION
1. Installation is in the reverse order of removal.