2010 INFINITI QX56 brake

VDC
BRC-11
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
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FUNCTION DIAGNOSIS
VDC
System DiagramINFOID:0000000005147946
System DescriptionINFOID:0000000005147947
• Vehicle Dynamics Control system detects driver ′s steering operation amount and brake pedal travel from
steering angle sensor and pressure sensors. Using in formation from yaw rate/side/decel G sensor and
wheel sensor, VDC judges driving condition (conditions of under steer and over steer) to improve vehicle
driving stability by controlling brake application to 4 wheels and engine output.
• During VDC operation, it informs driver of s ystem operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0065GB
Revision: April 20092010 QX56

VDC
BRC-13
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
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Component DescriptionINFOID:0000000005147949
7. VDC OFF switch M253 8. Active booster E499. Delta stroke sensor E114
10. Brake fluid level switch E21 11. Front pressure sensor E31 12. Rear pressure sensor E32
Component parts Reference
ABS actuator and electric unit (control unit)Pump
BRC-37, "
Description"Motor
Actuator relayBRC-55, "
Description"
Solenoid valveBRC-47, "Description"
VDC switch-over valve
(CV1, CV2, SV1, SV2)BRC-69, "Description"
Wheel sensor
BRC-28, "Description"
Yaw rate/side/decel G sensorBRC-39, "Description"
Steering angle sensorBRC-60, "Description"
VDC OFF switchBRC-80, "Description"
ABS warning lampBRC-82, "Description"
Brake warning lampBRC-83, "Description"
VDC OFF indicator lampBRC-84, "Description"
SLIP indicator lampBRC-86, "Description"
Front pressure sensor
BRC-57, "Description"Rear pressure sensor
Active boosterBRC-72, "
Description"
Delta stroke sensorBRC-75, "Description"
Revision: April 20092010 QX56

BRC-14
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
TCS
TCS
System DiagramINFOID:0000000005147950
System DescriptionINFOID:0000000005147951
• Traction Control System is a function that electronically controls engine torque, brake fluid pressure and A/T
gear position to ensure the optimum slippage ratio at drive wheels by computing wheel speed signals from 4
wheel sensors. When ABS actuator and electric unit (control unit) detects a spin at drive wheels (rear
wheels), it compares wheel speed signals from all 4 wheels. At this time, LH and RH rear brake fluid pres-
sure are controlled, while fuel being cut to engine and throttle valve being closed to reduce engine torque by
the control unit. Further more, throttle position is continuously controlled to ensure the optimum engine
torque at all times.
• During TCS operation, it informs driver of syst em operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0065GB
Revision: April 20092010 QX56

BRC-16
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
TCS
Component Description
INFOID:0000000005206965
7. VDC OFF switch M253 8. Active booster E499. Delta stroke sensor E114
10. Brake fluid level switch E21 11. Front pressure sensor E31 12. Rear pressure sensor E32
Component parts Reference
ABS actuator and electric unit (control unit) Pump
BRC-37, "
Description"Motor
Actuator relayBRC-55, "
Description"
Solenoid valveBRC-47, "Description"
VDC switch-over valve
(CV1, CV2, SV1, SV2)BRC-69, "Description"
Wheel sensor
BRC-28, "Description"
Yaw rate/side/decel G sensorBRC-39, "Description"
Steering angle sensorBRC-60, "Description"
VDC OFF switchBRC-80, "Description"
ABS warning lampBRC-82, "Description"
Brake warning lampBRC-83, "Description"
VDC OFF indicator lampBRC-84, "Description"
SLIP indicator lampBRC-86, "Description"
Front pressure sensor
BRC-57, "Description"Rear pressure sensor
Active boosterBRC-72, "
Description"
Delta stroke sensorBRC-75, "Description"
Revision: April 20092010 QX56

ABS
BRC-19
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
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Component DescriptionINFOID:0000000005147957
7. VDC OFF switch M253 8. Active booster E499. Delta stroke sensor E114
10. Brake fluid level switch E21 11. Front pressure sensor E31 12. Rear pressure sensor E32
Component parts Reference
ABS actuator and electric unit (control unit)Pump
BRC-37, "
Description"Motor
Actuator relayBRC-55, "
Description"
Solenoid valveBRC-47, "Description"
Wheel sensor BRC-28, "Description"
ABS warning lampBRC-82, "Description"
Brake warning lampBRC-83, "Description"
Revision: April 20092010 QX56

BRC-20
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
EBD
EBD
System DiagramINFOID:0000000005147958
System DescriptionINFOID:0000000005147959
• Electric Brake force Distribution is a following functi
on. ABS actuator and electric unit (control unit) detects
subtle slippages between the front and rear wheels during braking. Then it electronically controls the rear
braking force (brake fluid pressure) to reduce rear wheel slippage. Accordingly, it improves vehicle stability.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0014GB
Revision: April 20092010 QX56

BRC-22
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
EBD
Component Description
INFOID:0000000005206968
7. VDC OFF switch M253 8. Active booster E499. Delta stroke sensor E114
10. Brake fluid level switch E21 11. Front pressure sensor E31 12. Rear pressure sensor E32
Component parts Reference
ABS actuator and electric unit (control unit) Pump
BRC-37, "
Description"Motor
Actuator relayBRC-55, "
Description"
Solenoid valveBRC-47, "Description"
Wheel sensor BRC-28, "Description"
ABS warning lampBRC-82, "Description"
Brake warning lampBRC-83, "Description"
Revision: April 20092010 QX56

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
BRC-23
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
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DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
CONSULT-III Function (ABS)INFOID:0000000005147962
FUNCTION
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
SELF DIAGNOSTIC RESULT MODE
Operation Procedure
1. Before performing the self-diagnosis, start engine and drive vehicle at 30 km/h (19 MPH) or more for
approximately 1 minute.
How to Erase Self-diagnosis Results
1. After erasing DTC memory, start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute as the final inspection, and make sure t hat the ABS warning lamp, VDC OFF indicator lamp,
SLIP indicator lamp and brake warning lamp turn OFF.
CAUTION:
If memory cannot be erased, perform applicable diagnosis.
NOTE:
• When the wheel sensor malfunctions, after inspecting the wheel sensor system, the ABS warning lamp,
VDC OFF indicator lamp, SLIP indicator lamp and brake warning lamp will not turn OFF even when the
system is normal unless the vehicle is driving at approximately 30 km/h (19 MPH) or more for approxi-
mately 1 minute.
• Brake warning lamp will turn ON in case of parking brake operation (when switch is ON) or of brake fluid level switch operation (when brake fluid is insufficient).
• VDC OFF switch should not stay “ON” position.
Display Item List
Refer to BRC-100, "DTC No. Index".
DATA MONITOR MODE
Display Item List
Diagnostic test mode Function
Work support This mode enables a technician to adjust some devices faster and more accurately by following
the indications on CONSULT-III.
Data Monitor Input/Output data in the ABS actuator and electric uni t (control unit) can be read.
Active Test Diagnostic test mode is which CONSULT-III driv
es some actuators apart from the ABS actuator
and electric unit (control unit) and also shifts some parameters in a specified range.
Self Diagnostic Result Self-diagnostic results can be read and erased quickly.
CAN diag support monitor The results of transmit/receive diagnosis of CAN communication can be read.
ECU Identification ABS actuator and electric unit (control unit) part number can be read.
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
FR LH SENSOR
(km/h, mph) ×× × Wheel speed (km/h, mph) calculated by front LH
wheel sensor signal is displayed.
FR RH SENSOR
(km/h, mph) ×× ×
Wheel speed (km/h, mph) calculated by front RH
wheel sensor signal is displayed.
RR LH SENSOR
(km/h, mph) ×× × Wheel speed (km/h, mph) calculated by rear LH
wheel sensor signal is displayed.
RR RH SENSOR
(km/h, mph) ×× × Wheel speed (km/h, mph) calculated by rear RH
wheel sensor signal is displayed.
Revision: April 20092010 QX56