2007 INFINITI QX56 Factory Service Manual

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Page 977 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-49
< SERVICE INFORMATION >[VDC/TCS/ABS]
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1.DISPLAY SELF-DIAGNOSIS RESULTS
Perform ABS actuator and electric unit (contro

Page 978 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-50
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS Works FrequentlyINFOID:0000000003532802
INSPECTION PROCEDURE
1.CHECK WARNING LAMP ACTIVATI

Page 979 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSES FOR SYMPTOMS
BRC-51
< SERVICE INFORMATION >[VDC/TCS/ABS]
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3.CHECK CONNECTOR AND BRAKING PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and e

TROUBLE DIAGNOSES FOR SYMPTOMS
BRC-51
< SERVICE INFORMATION >[VDC/TCS/ABS]
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3.CHECK CONNECTOR AND BRAKING PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector.
2. Drive vehicle and check brake operation.
NOTE:
• Stopping distance may be longer than vehicles without ABS when road condition is slippery.
• Driving the vehicle with the ABS actuator and electric unit (control unit) disconnected may induce DTCs
in electrical control units using CAN communication. After the inspection, clear all DTCs. Refer to LAN-
7.
OK or NG
OK >> GO TO 4.
NG >> Perform Basic Inspection. Refer to BRC-22, "
Basic Inspection".
4.CHECK WHEEL SENSORS
Check the following.
• Wheel sensor mounting for looseness
• Wheel sensors for physical damage
• Wheel sensor connectors for terminal damage or loose connections
OK or NG
OK >> Check ABS actuator and electric unit (control unit) connector terminals for deformation, discon-
nection, looseness or damage. Reconnect ABS actuator and electric unit (control unit) harness
connector. Then retest.
NG >> Repair or replace as necessary.
Long Stopping DistanceINFOID:0000000003532804
INSPECTION PROCEDURE
1.CHECK BASE BRAKING SYSTEM PERFORMANCE
1. Disable ABS by disconnecting ABS actuator and electric unit (control unit) connector.
2. Drive vehicle and check brake operation.
NOTE:
• Stopping distance may be longer than vehicles without ABS when road condition is slippery.
• Driving the vehicle with the ABS actuator and electric unit (control unit) disconnected may induce DTCs
in electrical control units using CAN communication. After the inspection, clear all DTCs. Refer to LAN-
7.
OK or NG
OK >> Go to BRC-50, "ABS Works Frequently".
NG >> Perform Basic Inspection. Refer to BRC-22, "
Basic Inspection".
ABS Does Not WorkINFOID:0000000003532805
CAUTION:
The ABS does not operate when the vehicle speed is 10 km/h (6 MPH) or less.
INSPECTION PROCEDURE
1.CHECK WARNING LAMP ACTIVATION
Turn ignition switch ON and check for warning lamp activation.
• Warning lamp should activate for approximately 2 seconds after turning the ignition switch ON.
OK or NG
OK >> Carry out self-diagnosis. Refer to BRC-26, "CONSULT-II Function (ABS)".
NG >> Go to BRC-22, "
Basic Inspection".
Pedal Vibration or ABS Operation NoiseINFOID:0000000003532806
NOTE:
During ABS activation, pedal vibration may be felt and a noise may be heard. This is normal and does not indi-
cate a malfunction.
INSPECTION PROCEDURE

Page 980 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-52
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
1.CHECK SYMPTOM
1. Apply brake.
2. Start engine.
Does the symptom occur only when engine is started?
YES >> Carry out self-di

BRC-52
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSES FOR SYMPTOMS
1.CHECK SYMPTOM
1. Apply brake.
2. Start engine.
Does the symptom occur only when engine is started?
YES >> Carry out self-diagnosis. Refer to BRC-26, "CONSULT-II Function (ABS)".
NO >> GO TO 2.
2.RECHECK SYMPTOM
Does the symptom occur only when electrical equipment switches (such as headlamps) are turned on?
YES >> Check for radio, antenna or related wiring that is routed too close to the ABS actuator and electric
unit (control unit) and reroute as necessary.
NO >> Go to BRC-50, "
ABS Works Frequently".
Vehicle Jerks During TCS/VDC ActivationINFOID:0000000003532807
INSPECTION PROCEDURE
1.ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis.
Are self-diagnosis result items displayed?
YES >> After checking and repairing the applicable item, perform the ABS actuator and electric unit (con-
trol unit) self-diagnosis again.
NO >> GO TO 2.
2.ENGINE SPEED SIGNAL INSPECTION
Perform data monitor with CONSULT-II for the ABS actuator and electric unit (control unit).
Is the engine speed at idle 400 rpm or higher?
YES >> GO TO 4.
NO >> GO TO 3.
3.ECM SELF-DIAGNOSIS
Perform ECM self-diagnosis.
Are self-diagnosis result items displayed?
YES >> After checking and repairing the applicable item, perform the ECM self-diagnosis again.
NO >> GO TO 4.
4.TCM SELF-DIAGNOSIS
Perform TCM self-diagnosis.
Are self-diagnosis result items displayed?
YES >> After checking and repairing the applicable item, perform the TCM self-diagnosis again.
NO >> GO TO 5.
5.CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit (control unit) connector and the ECM connectors and check the
terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace as necessary.
6.CAN COMMUNICATION INSPECTION
Check the CAN communication system. Refer to BRC-48, "
CAN Communication System Inspection".
OK or NG
OK >> Inspection End.
NG >> Refer to LAN-7
.

Page 981 of 3061

INFINITI QX56 2007 Factory Service Manual 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 term

Page 982 of 3061

INFINITI QX56 2007 Factory Service Manual 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

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

Page 983 of 3061

INFINITI QX56 2007 Factory Service Manual 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

Page 984 of 3061

INFINITI QX56 2007 Factory Service Manual 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, fir

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