2005 INFINITI QX4 Factory Service Manual

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Page 1017 of 3419

INFINITI QX4 2005 Factory Service Manual BRC-6
[VDC/TCS/ABS]
PREPARATION
Revision: October 20052005 QX56
PREPARATIONPFP:00002
Special Service ToolEFS005G1
The actual shapes of Kent-Moore tools may differ from those of special service tools i

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INFINITI QX4 2005 Factory Service Manual SYSTEM DESCRIPTION
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Revision: October 20052005 QX56
SYSTEM DESCRIPTIONPFP:00000
System ComponentsEFS004XB
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INFINITI QX4 2005 Factory Service Manual BRC-8
[VDC/TCS/ABS]
SYSTEM DESCRIPTION
Revision: October 20052005 QX56
ABS FunctionEFS004XC
The Anti-Lock Brake System detects wheel revolution while braking and improves handling stability during
su

BRC-8
[VDC/TCS/ABS]
SYSTEM DESCRIPTION
Revision: October 20052005 QX56
ABS FunctionEFS004XC
The Anti-Lock Brake System detects wheel revolution while braking and improves handling stability during
sudden braking by electrically preventing wheel lockup. Maneuverability is also improved for avoiding
obstacles.
If the electrical system malfunctions, the Fail-Safe function is activated, the ABS becomes inoperative and
the ABS warning lamp turns on.
The electrical system can be diagnosed using CONSULT-II.
During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
EBD FunctionEFS004XD
Electronic Brake Distribution is a function that detects subtle slippages between the front and rear wheels
during braking, and it improves handling stability by electronically controlling the brake fluid pressure
which results in reduced rear wheel slippage.
If the electrical system malfunctions, the Fail-Safe function is activated, the EBD and ABS become inoper-
ative, and the ABS warning lamp and BRAKE warning lamp are turned on.
The electrical system can be diagnosed using CONSULT-II.
During EBD operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is
normal.
Just after starting the vehicle, the brake pedal may vibrate or a motor operating noise may be heard from
engine compartment. This is a normal status of operation check.
TCS FunctionEFS004XE
Spinning of the drive wheels is detected by the ABS actuator and electric unit (control unit) using inputs
from the wheel speed sensors. If wheel spin occurs, the drive wheel right and left brake fluid pressure
control and engine fuel cut are activated while the throttle value is restricted to reduce the engine torque
and decrease the amount of wheel spin. In addition, the throttle opening is controlled to achieve the opti-
mum engine torque.
Depending on road condition, the vehicle may have a sluggish feel. This is normal, because optimum trac-
tion has the highest priority during TCS operation.
TCS may be activated during sudden vehicle acceleration, wide open throttle acceleration, sudden trans-
mission shifts or when the vehicle is driven on a road with a varying surface friction coefficient.
The SLIP indicator lamp flashes to inform the driver of TCS operation.
VDC FunctionEFS004XF
In addition to the ABS/TCS function, the driver steering amount and brake operation amount are detected
from the steering angle sensor and front and rear pressure sensors, and the vehicle's driving status
(amount of under steering/over steering) is determined using inputs from the yaw rate sensor/side G sen-
sor, wheel speed sensors, etc. and this information is used to improve vehicle stability by controlling the
braking and engine torque application to the wheels.
The SLIP indicator lamp flashes to inform the driver of VDC operation.
During VDC operation, the vehicle body and brake pedal may vibrate lightly and a mechanical noise may
be heard. This is normal.
The ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp may turn on when the vehicle is
subject to strong shaking or large vibration, such as when the vehicle is on a turn table or a ship while the
engine is running or on a steep slope. In this case, restart the engine on a normal road and if the ABS
warning lamp, VDC OFF indicator lamp and SLIP indicator lamp turn off, there is no problem.
Fail-Safe FunctionEFS004XG
CAUTION:
If the Fail-Safe function is activated, perform the Self Diagnosis for ABS/TCS/VDC system.

Page 1020 of 3419

INFINITI QX4 2005 Factory Service Manual SYSTEM DESCRIPTION
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Revision: October 20052005 QX56
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the ABS warning lamp, VDC OFF indica

Page 1021 of 3419

INFINITI QX4 2005 Factory Service Manual BRC-10
[VDC/TCS/ABS]
CAN COMMUNICATION
Revision: October 20052005 QX56
CAN COMMUNICATIONPFP:23710
System DescriptionEFS004XI
Refer to LAN-5, "CAN COMMUNICATION" .

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INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
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How to Perform Trouble Diagnoses for Quick and Accurate RepairEFS004XJ
INTR

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INFINITI QX4 2005 Factory Service Manual BRC-12
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
WORK FLOW
WFIA0358E

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INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
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Revision: October 20052005 QX56
CLARIFY CONCERN
A customers description of a vehicle concern may vary depend-
ing on the individual.

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