2007 INFINITI QX56 Factory Service Manual

jacking dead battery open trunk fuel reserve low oil pressure air condition OBD port

Page 961 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
BRC-33
< SERVICE INFORMATION >[VDC/TCS/ABS]
C
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B
BRC
N
O
P*: ON for 1 to 2 seconds after the touch, and then OFF
NOTE:
• If active test is performed with brake pe

Page 962 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-34
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Wheel Sensor System InspectionINFOID:0000000003532784
INSPECTION PRO

BRC-34
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Wheel Sensor System InspectionINFOID:0000000003532784
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.
OK or NG
OK >> GO TO 2.
NG >> 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 sensor tester detect a signal?
YES >> GO TO 3.
NO >> Replace the wheel sensor. Refer to BRC-56, "
Removal and Installation".
3.CHECK TIRES
Check for inflation pressure, wear and size of each tire.
Are tire pressure and size correct and is tire wear within specifications?
YES >> GO TO 4.
NO >> Adjust tire pressure or replace tire(s).
4.CHECK WHEEL BEARINGS
Check wheel bearing axial end play. Refer to FAX-5, "
On-Vehicle Inspection and Service" (front) or RAX-5,
"On-Vehicle Inspection and Service" (rear).
OK or NG
OK >> GO TO 5.
NG >> Repair or replace as necessary. Refer to FAX-5, "
On-Vehicle Inspection and Service" (front) or
RAX-5, "
On-Vehicle Inspection and Service" (rear).
5.CHECK WIRING HARNESS FOR SHORT CIRCUIT
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor and wheel sensor connector of malfunction code No.
2. Check continuity between wheel sensor harness connector ter-
minals and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair the circuit.
6.CHECK WIRING HARNESS FOR OPEN CIRCUITContinuity should not exist.
WFIA0343E

Page 963 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-35
< SERVICE INFORMATION >[VDC/TCS/ABS]
C
D
E
G
H
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K
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MA
B
BRC
N
O
P
1. Check continuity between ABS actuator and electric unit (control unit) harne

Page 964 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-36
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Is the above displayed in the self-diagnosis display items?
YES >> Replace ABS actuator and electric unit (contr

Page 965 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-37
< SERVICE INFORMATION >[VDC/TCS/ABS]
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B
BRC
N
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P
OK or NG
OK >> Perform ABS actuator and electric unit (control unit) self-diagn

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-37
< SERVICE INFORMATION >[VDC/TCS/ABS]
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G
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MA
B
BRC
N
O
P
OK or NG
OK >> Perform ABS actuator and electric unit (control unit) self-diagnosis again.
NG >> Replace spiral cable (steering angle sensor) and adjust neutral position of steering angle sensor.
Refer to BRC-54, "
Adjustment of Steering Angle Sensor Neutral Position".
Yaw Rate/Side/Decel G Sensor System InspectionINFOID:0000000003532788
CAUTION:
Sudden turns (such as spin turns, acceleration turns), drifting, etc. when VDC function is OFF may
cause the yaw rate/side/decel G sensor system to indicate a problem. This is not a problem if normal
operation can be resumed after restarting the engine.
INSPECTION PROCEDURE
1.SELF-DIAGNOSIS RESULT CHECK
Check self-diagnosis results.
CAUTION:
If vehicle is on turn table at entrance to parking garage, or on other moving surface, VDC OFF indica-
tor lamp may illuminate and CONSULT-II self-diagnosis may indicate yaw rate sensor system malfunc-
tion. However, in this case there is no malfunction in yaw rate sensor system. Take vehicle off of turn
table or other moving surface, and start engine. Results will return to normal.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> Inspection End.
2.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.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3.YAW RATE/SIDE/DECEL G SENSOR HARNESS INSPECTION
1. Turn off the ignition switch and disconnect yaw rate/side/decel G sensor connector M108 and ABS actua-
tor and electric unit (control unit) connector E125.
2. Check continuity between the ABS actuator and electric unit (control unit) connector E125 and the yaw
rate/side/decel G sensor connector M108.
Steering condition Data monitor
Straight-ahead –3.5 deg to +3.5 deg
Turn wheel to the right by 90°Approx. - 90deg
Turn wheel to the left by 90°Approx. + 90deg
Self-diagnosis results
YAW R AT E S E N S O R
G-SENSOR
SIDE G-SEN CIRCUIT
ABS actuator and electric unit (control
unit) harness connector E125Yaw rate/side/decel G sensor
harness connector M108Continuity

Page 966 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-38
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
OK or NG
OK >> GO TO 4.
NG >> Repair or replace as necessary.
4.YAW RATE/SIDE/DECEL G SENSOR INSPECTION
1. Conne

Page 967 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-39
< SERVICE INFORMATION >[VDC/TCS/ABS]
C
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B
BRC
N
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P
1. Disconnect ABS actuator and electric unit (control unit) connector E125.
2.

Page 968 of 3061

INFINITI QX56 2007 Factory Service Manual BRC-40
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
1. Check voltage between ABS actuator and electric unit (control
unit) harness connector E125 and body ground.
2

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