Infiniti QX4 (R50). Manual — part 116
8. Vehicle Vibrates Excessively When ABS Is
Operating
=NBBR0078
I
While ABS is operating, brake pedal vibrates slightly. This is
not a problem.
I
If vehicle vibration is greater in the AUTO mode than in the
2WD mode, there is the possibility of failure in the communi-
cation line between the ABS control unit and transfer control
unit. Check and locate the cause of the problem.
1
INSPECTION START
Inspection for excessive vibration of vehicle
SBR508E
©
GO TO 2.
2
CARRY OUT SELF-DIAGNOSIS
Perform self-diagnosis for the ABS actuator and electric unit and transfer control unit.
Are there any malfunctions?
Yes
©
GO TO 3.
No
©
GO TO 4.
3
INSPECTION OR REPAIR
Inspect or repair the system according to the self-diagnostic item.
OK
©
GO TO 4.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
8. Vehicle Vibrates Excessively When ABS Is Operating
BR-77
4
CHECK CIRCUIT
1. Disconnect connectors from ABS actuator and electric unit and transfer control unit. Check terminals for damage or
loose connection.
2. Check continuity between ABS actuator and electric unit connector terminal 13 and transfer control unit connector ter-
minal 32.
SBR509E
Does continuity exist?
Yes
©
GO TO 5.
No
©
Check the following.
I
Harness connectors E111, M143
I
Harness for open or short between ABS actuator and electric unit and transfer control
unit
If NG, repair harness or connectors.
5
CHECK ABS OPERATING SIGNAL CIRCUIT
1. Reconnect only ABS actuator and electric unit connector.
2. Check continuity between transfer control unit connector terminal 32 and ground.
Continuity should not exist.
SBR510E
Does continuity exist?
Yes
©
Replace ABS actuator and electric unit.
No
©
GO TO 6.
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
8. Vehicle Vibrates Excessively When ABS Is Operating (Cont’d)
BR-78
6
CHECK ABS OPERATING SIGNAL
1. Connect CONSULT-II to Data Link Connector.
2. Turn ignition switch “ON”. Set CONSULT-II in the active test mode to output an ABS operating signal.
(Refer to “ACTIVE TEST PROCEDURE”, “CONSULT-II Inspection Procedure”, BR-47.)
3. An ABS operating signal lasts for 10 seconds. During the time the signal is being output, check resistance between
transfer control unit connector terminal 32 and ground.
Resistance: 0.5
Ω
, max.
SBR680E
Is resistance within specifications?
Yes
©
CHECK transfer control unit.
Refer to TF-86, “TROUBLE DIAGNOSIS FOR ABS OPERATION SIGNAL”.
No
©
Replace ABS actuator and electric unit.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
8. Vehicle Vibrates Excessively When ABS Is Operating (Cont’d)
BR-79
=NBBR0079
CAUTION:
Be careful not to damage sensor edge and sensor rotor teeth.
When removing the front or rear wheel hub assembly, discon-
nect the ABS wheel sensor from the assembly and move it
away.
Front Wheel Sensor
NBBR0079S01
SBR398D
Rear Wheel Sensor
NBBR0079S02
SBR399D
REMOVAL AND INSTALLATION
ABS
BR-80
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