INFINITI FX35 2006 Service Manual

SYSTEM DESCRIPTION BRC-9
[VDC/TCS/ABS]
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Revision: 2006 December 2006 FX35/FX45
ABS

The Anti-Lock Brake System is a function that detects wheel revolution while braking, and it improves
handling stability during sudden braking by electrically preventing 4 wheel lock. Maneuverability is also
improved for avoiding obstacles.

If the electrical system malfunctions, then the fail-safe function starts, the ABS becomes inoperative, and
ABS warning lamp turns on.

Electrical system diagnosis by CONSULT-II is available.

During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.

When starting engine, or just after starting vehicle, brake pedal may vibrate or motor operating noises
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

The Electronic Brake Distribution is a function that detects subtle slippages between 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.

In case of electrical system malfunction, the fail-safe function is activated, EBD and ABS becomes inoper-
ative, and ABS warning lamp and brake warning lamp are turned on.

Electrical system diagnosis by CONSULT-II is available.

During EBD operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.

When starting engine, or just after starting vehicle, brake pedal may vibrate or motor operating noises
may be heard from engine compartment. This is a normal status of operation check.

Stopping distance may be longer than that of vehicles without EBD when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
Fail-Safe FunctionNFS000N8
VDC / TCS SYSTEM
In case of malfunction in the VDC/TCS system, VDC OFF indicator lamp and SLIP indicator lamp are turned
on, and the condition of vehicle is the same as the condition of vehicles without VDC/TCS system. In case of
malfunction in the VDC/TCS system, the ABS control continues to operate normally without VDC/TCS control.
CAUTION:
If the fail-safe function is activated, then perform the self-diagnosis for VDC/TCS/ABS control system.
ABS, EBD SYSTEM
In case of electrical malfunctions with the ABS, ABS warning lamp, VDC OFF indicator lamp and SLIP indica-
tor lamp will turn on. In case of electrical malfunctions with the EBD, brake warning lamp, ABS warning lamp,
VDC OFF indicator lamp and SLIP indicator lamp will turn on. Simultaneously, the VDC/TCS/ABS become one
of the following conditions of the fail-safe function.

For malfunction of ABS, only the EBD is activated and the condition of vehicle is the same condition of
vehicles without TCS/ABS system.
NOTE:
ABS self-diagnosis sound may be heard. That is a normal condition because a self-diagnosis for “Ignition
switch ON” and “The first starting” are being performed.

For malfunction of EBD, EBD and ABS become inoperative, and the condition of vehicle is the same as
the condition of vehicles without TCS/ABS, EBD system.

BRC-10
[VDC/TCS/ABS]
SYSTEM DESCRIPTION
Revision: 2006 December 2006 FX35/FX45
Hydraulic Circuit DiagramNFS000N9
CAN CommunicationNFS000OL
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application.It is an on-vehicle multi-
plex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and kinks with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. Refer to LAN-32, "
CAN
Communication Unit" .
SFIA1163E

TROUBLE DIAGNOSIS BRC-11
[VDC/TCS/ABS]
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Revision: 2006 December 2006 FX35/FX45
TROUBLE DIAGNOSISPFP:00004
Fail-Safe FunctionNFS000OM
VDC/TCS SYSTEM
In case of malfunction in the VDC/TCS system, VDC OFF indicator lamp and SLIP indicator lamp are turned
on, and the condition of vehicle is the same as the condition of vehicles without VDC/TCS system. In case of
malfunction in the VDC/TCS system, the ABS control continues to operate normally without VDC/TCS control.
CAUTION:
If the fail-safe function is activated, then perform the self-diagnosis for VDC/TCS/ABS control system.
ABS, EBD SYSTEM
In case of electrical malfunctions with the ABS, ABS warning lamp, VDC OFF indicator lamp, SLIP indicator
lamp will turn on. In case of electrical malfunctions with the EBD, brake warning lamp, ABS warning lamp,
VDC OFF indicator lamp and SLIP indicator lamp will turn on. Simultaneously, the VDC/TCS/ABS become one
of the following conditions of the fail-safe function.

For malfunction of ABS, only the EBD is activated and the condition of vehicle is the same condition of
vehicles without TCS/ABS system.
NOTE:
ABS self-diagnosis sound may be heard. That is a normal condition because a self-diagnosis for “Ignition
switch ON” and “The first starting” are being performed.

For malfunction of EBD, EBD and ABS become inoperative, and the condition of vehicle is the same as
the condition of vehicles without TCS/ABS, EBD system.
How to Proceed with DiagnosisNFS000NB
BASIC CONCEPT

Most important point to perform diagnosis is to understand systems (control and mechanism) in vehicle
thoroughly.

It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
NOTE:
Customers are not professionals. Do not assume “maybe cus-
tomer means...” or “maybe customer mentioned this symptom”.

It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.

After diagnosis, make sure to perform “erase memory”. Refer to
BRC-25, "
Self-Diagnosis" .

For an intermittent malfunction, move harness or harness con-
nector by hand to check poor contact or false open circuit.

Always read “GI General Information” to confirm general precautions. Refer to GI-4, "General Precau-
tions" .
SEF234G
SEF233G

BRC-12
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
DIAGNOSIS FLOWCHART
SFIA3272E

TROUBLE DIAGNOSIS BRC-13
[VDC/TCS/ABS]
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Revision: 2006 December 2006 FX35/FX45
ASKING COMPLAINTS

Complaints against malfunction vary depending on each person.
It is important to clarify customer complaints.

Ask customer about what symptoms are present and under
what conditions. Use information to reproduce symptom while
driving.

It is also important to use diagnosis sheet so as not to miss infor-
mation.
EXAMPLE OF DIAGNOSIS SHEET
SBR339B
SFIA3265E

BRC-14
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
Component Installation LocationNFS000NC
SFIA2785E

TROUBLE DIAGNOSIS BRC-15
[VDC/TCS/ABS]
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BRC
Revision: 2006 December 2006 FX35/FX45
SchematicNFS000ND
TFWM0229E

BRC-16
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
Wiring Diagram — VDC —NFS000NE
TFWM0230E

TROUBLE DIAGNOSIS BRC-17
[VDC/TCS/ABS]
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BRC
Revision: 2006 December 2006 FX35/FX45
TFWM0231E

BRC-18
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
TFWM0232E