Infiniti M35/M45 Y50. Manual — part 337
TROUBLE DIAGNOSIS FOR SYSTEM
BRC-49
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
VDC OFF Switch Circuit
NFS000R1
INSPECTION PROCEDURE
1.
CHECK VDC OFF SWITCH
1.
Turn ignition switch OFF and disconnect VDC OFF switch con-
nector M24.
2.
Check continuity between VDC OFF switch connector M24 ter-
minal 1 and 2.
OK or NG
OK
>> GO TO 2.
NG
>> VDC OFF switch is malfunctioning. Replace VDC OFF
switch.
2.
CHECK VDC OFF SWITCH HARNESS
1.
Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2.
Check continuity between VDC OFF switch connector M24 and
ABS actuator and electric unit (control unit) connector E30.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace malfunctioning components.
VDC OFF switch
Condition
Continuity
1, 2
VDC OFF switch ON
Yes
VDC OFF switch OFF
No
SFIA2409E
ABS actuator and electric unit (control unit)
VDC OFF switch
Continuity
31
1
Yes
Ground
No
Ground
2
Yes
SFIA3047E
BRC-50
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYSTEM
Parking Brake Switch Circuit
NFS000R2
INSPECTION PROCEDURE
1.
CHECK PARKING BRAKE SWITCH
1.
Turn ignition switch OFF and disconnect parking brake switch
connector E110.
2.
Check continuity between parking brake switch connector E110
and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Parking brake switch is malfunctioning. Replace parking
brake switch.
2.
CHECK PARKING BRAKE SWITCH HARNESS
1.
Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.
2.
Check continuity between parking brake switch connector E110
and ABS actuator and electric unit (control unit) connector E30.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace malfunctioning components.
Warning Lamp and Indicator Lamp Circuit
NFS000R3
INSPECTION PROCEDURE
1.
CHECK SELF-DIAGNOSIS RESULTS
Perform ABS actuator and electric unit (control unit) self-diagnosis.
OK or NG
OK
>> GO TO 2.
NG
>> Check items displayed by self-diagnosis. Refer to
2.
CHECK COMBINATION METER
Check the indication and operation of combination meter are normal. Refer to
DI-17, "Self-Diagnosis Mode of
OK or NG
OK
>> INSPECTION END
NG
>> Combination meter is malfunctioning. Repair or replace combination meter. Refer to
Condition
Continuity
When the parking brake pedal is operated
Yes
When the parking brake pedal is not operated
No
SFIA2935E
ABS actuator and electric unit (control unit)
Parking brake switch
Continuity
36
1
Yes
Ground
No
SFIA3048E
TROUBLE DIAGNOSIS FOR SYMPTOMS
BRC-51
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
TROUBLE DIAGNOSIS FOR SYMPTOMS
PFP:00007
Excessive ABS Function Operation Frequency
NFS000R4
1.
CHECK START
Check front and rear brake force distribution using a brake tester. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Check brake system.
2.
CHECK FRONT AND REAR AXLE
Make sure that there is no excessive play in the front and rear axles. Refer to front:
RAX-5, "WHEEL BEARING INSPECTION"
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace malfunctioning components.
3.
CHECK WHEEL SENSOR AND SENSOR ROTOR
Check the following.
●
Wheel sensor installation for damage.
●
Sensor rotor installation for damage.
●
Wheel sensor connector connection.
●
Wheel sensor harness inspection.
OK or NG
OK
>> GO TO 4.
NG
>>
●
Replace wheel sensor or sensor rotor.
●
Repair harness.
4.
CHECK ABS WARNING LAMP DISPLAY
Make sure that the ABS warning lamp is turned off after the ignition switch is turned ON or when driving.
OK or NG
OK
>> Normal
NG
>> Perform self-diagnosis. Refer to
Unexpected Pedal Reaction
NFS000R5
1.
CHECK BRAKE PEDAL STROKE
Check brake pedal stroke. Refer to
BR-6, "Inspection and Adjustment"
Is the stroke too big?
YES
>>
●
Bleed air from brake tube and hose. Refer to
BR-10, "Bleeding Brake System"
.
●
Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake sys-
tem fluid leakage, etc. Refer to brake pedal:
, brake booster and mas-
ter cylinder:
NO
>> GO TO 2.
2.
CHECK FUNCTION
Disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS. Check if braking force is
normal in this condition. Connect connector after inspection.
OK or NG
OK
>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to
"Excessive ABS Function Operation Frequency"
.
NG
>> Check brake system.
BRC-52
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SYMPTOMS
The Braking Distance Is Long
NFS000R6
CAUTION:
The stopping distance on slippery road surfaces might be longer with the ABS operating than when
the ABS is not operating.
1.
CHECK FUNCTION
Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector to deactivate
ABS. In this condition, check stopping distance. After inspection, connect connector.
OK or NG
OK
>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to
"Excessive ABS Function Operation Frequency"
NG
>> Check brake system.
ABS Function Does Not Operate
NFS000R7
CAUTION:
ABS does not operate when speed is 10 km/h (6 MPH) or lower.
1.
CHECK ABS WARNING LAMP DISPLAY
Make sure that the ABS warning lamp turns OFF after ignition switch is turned on or when driving.
OK or NG
OK
>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to
"Excessive ABS Function Operation Frequency"
NG
>> Perform self-diagnosis. Refer to
.
Pedal Vibration or ABS Operation Sound Occurs
NFS000R8
CAUTION:
Under the following conditions, ABS is activated and vibration is felt when brake pedal is lightly
depressed (just place a foot on it). However, this is normal.
●
When shifting gears
●
When driving on slippery road
●
During cornering at high speed
●
When passing over bumps or grooves [at approximately 50 mm (1.97 in) or more]
●
When pulling away just after starting engine [at approximately 10 km/h (6 MPH) or higher]
1.
SYMPTOM CHECK 1
Check if there is pedal vibration or operation sound when the engine is started.
Do symptoms occur?
YES
>> GO TO 2.
NO
>> Perform self -diagnosis. Refer to
2.
SYMPTOM CHECK 2
Check symptoms when electrical component (headlamps, etc.) switches are operated.
Do symptoms occur?
YES
>> Check if there is a radio, antenna, antenna lead wire, or wiring close to the control unit. If there is,
move it farther away.
NO
>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to
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