Infiniti F50. Manual - part 266

 

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Infiniti F50. Manual - part 266

 

 

SYSTEM DESCRIPTION

BRC-7

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BRC

SYSTEM DESCRIPTION

PFP:00000

Fail-Safe

EFS0020F

ABS SYSTEM

If a malfunction occurs in electrical system, ABS warning lamp, VDC OFF indicator lamp, and SLIP indicator
lamp in combination meter turn ON. In this condition, fail-safe function puts VDC/TCS/ABS and EBD into one
of following conditions.

1.

Only EBD operates. Same condition as that of models without VDC/TCS/ABS.

2.

VDC/TCS/ABS and EBD do not operate. All 4 wheels operate as normal brakes.

NOTE:
In step 1 shown above, self-diagnosis when ignition switch is turned ON and when vehicle starts at initial time
is carried out. ABS self-diagnosis noise may be heard as usual.

VDC/TCS SYSTEM

If a malfunction occurs in electrical system, VDC OFF indicator lamp and SLIP indicator lamp in combination
meter turn on. In this condition, VDC/TCS will be deactivated and it becomes equal to that of models without
VDC/TCS. However, ABS is controlled normally.
If a malfunction occurs in throttle control system, VDC/TCS control will be deactivated and only ABS control
will operate normally.

CAUTION:

If fail-safe mode is initiated, carry out self-diagnosis for VDC/TCS/ABS control system.

Hydraulic Circuit Diagram

EFS0020G

ABS Function

EFS0020H

1.

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

2.

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.

3.

Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.

4.

EBD is integrated in VDC/TCS/ABS system.

SFIA0831E

BRC-8

SYSTEM DESCRIPTION

TCS Function

EFS0020I

1.

VDC/TCS/ABS control unit detects a spin at drive wheels by comparing wheel speed signals from all 4
wheels. At this time, output from control unit controls brake fluid pressure to both LH and RH rear wheels
while cutting fuel to engine and closing throttle valve to reduce engine torque. Furthermore, throttle posi-
tion is continuously controlled to insure appropriate engine torque at all times.

2.

Depending on road circumstances, driver may have a sluggish feel. This is normal, because optimum
traction has highest priority under TCS operation.

3.

When vehicle is passing through a road where surface friction coefficient varies, downshifting or depress-
ing accelerator pedal fully may activate TCS temporarily.

4.

During TCS operation, it informs driver of system operation by flashing SLIP indicator lamp.

VDC Function

EFS0020J

1.

In addition to TCS/ABS function, VDC detects driver's steering operation amount and brake pedal travel
from steering angle sensor and pressure sensor. Using information from yaw rate/side G-sensor and
wheel sensor, VDC judges driving condition (conditions of under steer and over steer) to improve stability
by controlling brake application to 4 wheels and engine output.

2.

SLIP indicator lamp flashes to inform driver of VDC operation.

3.

During VDC operation, body and brake pedal lightly vibrate and mechanical noises may be heard. This is
normal.

4.

If vehicle is rotated on turn table, or rolled and rocked on ship, ABS warning lamp, VDC OFF indicator
lamp, and SLIP indicator lamp may turn ON. In this case, start engine on normal road again. If ABS warn-
ing lamp, VDC OFF indicator lamp, and SLIP indicator lamp turn OFF after restart, it is normal.

5.

When driving in steep slope such as bank, ABS warning lamp, VDC OFF indicator lamp, and SLIP indica-
tor lamp may turn ON. In this case, start engine on normal road again. If ABS warning lamp, VDC OFF
indicator lamp, and SLIP indicator lamp turn OFF after restart, it is normal.

System Diagram

EFS0020K

SFIA0795E

CAN COMMUNICATION

BRC-9

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BRC

CAN COMMUNICATION

PFP:23710

System Description

EFS0027U

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex 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 links 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.

FOR VDC MODELS
System Diagram

Input/Output Signal

T: Transmit   R: Receive

SKIA3762E

Signals

TCM

Combination 

meter

Steering angle 

sensor

VDC / TCS / 

ABS control 

unit

ECM

Engine speed signal

R

R

R

T

Engine coolant temperature signal

R

R

T

Accelerator pedal position signal

R

R

T

Engine torque signal

R

R

T

Battery voltage signal

R

T

Closed throttle position signal

R

T

Wide open throttle position signal

R

T

Lock-up prohibition signal

R

T

Torque-down permission signal

R

T

Fuel consumption monitor signal

R

T

Lock-up signal

T

R

Hard deceleration signal

T

R

Torque-down signal

T

R

Power mode indicator signal

T

R

A/T fluid temperature warning lamp signal

T

R

R

Current gear position signal

T

R

R

R

R

T

Next gear position signal

T

R

R

Shift change signal

T

R

R

Shift pattern signal

T

R

VDC system control signal

T

R

VDC operation signal

T

R

Stop lamp switch signal

R

T

Steering wheel angle sensor signal

R

T

R

R

BRC-10

CAN COMMUNICATION

FOR ICC MODELS
System Diagram

Input/Output Signal

T: Transmit   R: Receive

Air conditioner switch signal

T

R

Head lamp switch signal

T

R

Rear window defogger switch signal

T

R

OD cancel switch signal

R

T

R

Brake switch signal

R

T

Power mode switch signal

R

T

Vehicle speed signal

R

R

T

R

T

R

T

R

Signals

TCM

Combination 

meter

Steering angle 

sensor

VDC / TCS / 

ABS control 

unit

ECM

SKIA3763E

Signals

TCM

Combina-

tion meter

Steering 

angle 

sensor

ICC unit

ICC sen-

sor

VDC / 

TCS / 

ABS con-

trol unit

ECM

ICC system display signal

R

T

ICC sensor signal

R

T

Engine speed signal

R

R

R

R

T

Engine coolant temperature signal

R

R

T

Accelerator pedal position signal

R

R

T

Engine torque signal

R

R

T

Battery voltage signal

R

T

Closed throttle position signal

R

R

T

Lock-up prohibition signal

R

T

Torque-down permission signal

R

T

Fuel consumption monitor signal

R

T

Lock-up signal

T

R

Hard deceleration signal

T

R

Torque-down signal

T

R

Power mode indicator signal

T

R

A/T fluid temperature warning lamp signal

T

R

R

Current gear position signal

T

R

R

R

R

T

Next gear position signal

T

R

R

 

 

 

 

 

 

 

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