Infiniti QX4 (R50). Manual — part 114
1. ABS Works Frequently
NBBR0107
1
CHECK BRAKE FLUID PRESSURE
Check brake fluid pressure distribution.
Refer to “Inspection”, “LOAD SENSING VALVE”, BR-12.
Is brake fluid pressure distribution normal?
Yes
©
GO TO 2.
No
©
Repair. Then perform Preliminary Check.
Refer to BR-50.
2
CHECK WHEEL SENSOR
1. Check wheel sensor connector for terminal damage or loose connections.
2. Perform wheel sensor mechanical check.
Refer to “7. CHECK SENSOR ROTOR” in “DIAGNOSTIC PROCEDURE”, “Wheel Sensor or Rotor”, BR-56.
Is wheel sensor mechanism OK?
Yes
©
GO TO 3.
No
©
Repair.
3
CHECK FRONT AXLE
Check front axles for excessive looseness. Refer to AX-4, “Front Wheel Bearing”.
Is front axle installed properly?
Yes
©
Go to “3. CHECK WARNING LAMP INDICATION” in “2. Unexpected Pedal Action”,
BR-70.
No
©
Repair.
2. Unexpected Pedal Action
NBBR0108
1
CHECK BRAKE PEDAL STROKE
Check brake pedal stroke.
SBR540A
Is brake pedal stroke excessively large?
Yes
©
Perform Preliminary Check. Refer to BR-50.
No
©
GO TO 2.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
1. ABS Works Frequently
BR-69
2
CHECK MECHANICAL BRAKE SYSTEM PERFORMANCE
Disconnect ABS actuator and electric unit connector and check whether brake is effective.
Does brake system function properly when brake pedal is depressed?
Yes
©
GO TO 3.
No
©
Perform Preliminary Check. Refer to BR-50.
3
CHECK WARNING LAMP INDICATION
Ensure warning lamp remains off while driving.
SBR672E
Is warning lamp turned off?
Yes
©
GO TO 4.
No
©
Carry out self-diagnosis. Refer to BR-41, BR-44.
4
CHECK WHEEL SENSOR
1. Check wheel sensor connector for terminal damage or loose connection.
2. Perform wheel sensor mechanical check. Refer to “7. CHECK SENSOR ROTOR” in “DIAGNOSTIC PROCEDURE”,
“Wheel Sensor or Rotor”, BR-56.
Is wheel sensor mechanism OK?
Yes
©
Check ABS actuator and electric unit pin terminals for damage or the connection of ABS
actuator and electric unit harness connector.
Reconnect ABS actuator and electric unit harness connector.
Then retest.
No
©
Repair.
3. Long Stopping Distance
NBBR0109
1
CHECK MECHANICAL BRAKE SYSTEM PERFORMANCE
Disconnect ABS actuator and electric unit connector and check whether stopping distance is still long.
Does brake system function properly when brake pedal is depressed?
Yes
©
Perform Preliminary Check and air bleeding (if necessary).
No
©
Go to “3. CHECK WARNING LAMP INDICATION” in “2. Unexpected Pedal Action”,
BR-70.
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
2. Unexpected Pedal Action (Cont’d)
BR-70
NOTE:
Stopping distance may be longer for vehicles without ABS when
road condition is slippery.
4. ABS Does Not Work
NBBR0110
1
CHECK WARNING LAMP INDICATION
Does the ABS warning lamp activate?
Yes or No
Yes
©
Carry out self-diagnosis. Refer to BR-41, 44.
No
©
Go to “3. CHECK WARNING LAMP INDICATION” in “2. Unexpected Pedal Action”,
BR-70.
NOTE:
ABS does not work when vehicle speed is under 10 km/h (6 MPH).
5. Pedal Vibration and Noise
NBBR0111
1
INSPECTION START
Pedal vibration and noise inspection
SAT797A
©
GO TO 2.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
3. Long Stopping Distance (Cont’d)
BR-71
2
CHECK SYMPTOM
1. Apply brake.
2. Start engine.
Does the symptom appear only when engine is started?
Yes
©
Carry out self-diagnosis. Refer to BR-41, 44.
No
©
Go to “3. CHECK WARNING LAMP INDICATION” in “2. Unexpected Pedal Action”,
BR-70.
NOTE:
ABS may operate and cause vibration under any of the following
conditions.
I
Applying brake gradually when shifting or operating clutch.
I
Low friction (slippery) road.
I
High speed cornering.
I
Driving over bumps and pot holes.
I
Engine speed is over 5,000 rpm with vehicle stopped.
6. Warning Lamp Does Not Come On When
Ignition Switch Is Turned On
NBBR0112
1
INSPECTION START
Warning lamp circuit inspection
SBR673E
©
GO TO 2.
2
CHECK FUSE
Check 10A fuse No. 8. For fuse layout, refer to EL-16, “POWER SUPPLY ROUTING”.
Is fuse OK?
Yes
©
GO TO 3.
No
©
Replace fuse.
TROUBLE DIAGNOSES FOR SYMPTOMS
ABS
5. Pedal Vibration and Noise (Cont’d)
BR-72
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