Infiniti Q45. Manual — part 260
PREPARATION
BRC-5
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
PREPARATION
PFP:00002
Special Service Tools
NFS000CH
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service Tools
NFS000CI
Tool number
(Kent-Moore No.)
Tool name
Description
ST30720000
(J-25405)
Drift
a: 77 mm (3.03 in) dia.
b: 55.5 mm (2.19 in) dia.
Installing rear sensor rotor.
ST27863000
(
—
)
Drift
a: 74.5 mm (2.93 in) dia.
b: 62.5 mm (2.46 in) dia.
KV40104710
(
—
)
Drift
a: 76.3 mm (3.00 in) dia.
b: 67.9 mm (2.67 in) dia.
Installing rear sensor rotor.
ZZC0760D
ZZA0832D
Tool name
Description
1.Flare nut crowfoot
a:10 mm (0.39 in)/12 mm (0.47 in)
2.Torque wrench
Removing and installing each brake piping
S-NT360
BRC-6
[VDC/TCS/ABS]
ON-VEHICLE SERVICE
ON-VEHICLE SERVICE
PFP:00000
Adjustment of Steering Angle Sensor Neutral Position
NFS000CJ
In case of doing work that applies to the list below, make sure to adjust neutral position of steering angle sen-
sor before running vehicle.
×
: Required
–: Not required
CAUTION:
To adjust neutral position of steering angle sensor, make sure to use CONSULT-II.
(Adjustment cannot be done without CONSULT-II.)
1.
Stop vehicle with front wheels in straight-ahead position.
2.
Perform “CONSULT-II Start Procedure”. Refer to
GI-36, "CONSULT-II Start Procedure"
3.
Touch “WORK SUPPORT”.
4.
Touch “START”on“ST ANGLE SENSOR ADJUSTMENT”screen.
CAUTION:
Do not touch steering wheel while adjusting steering angle
sensor.
5.
After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)
6.
Turn ignition switch OFF, then turn it ON again.
CAUTION:
Be sure to perform above operation.
7.
Run vehicle with front wheels in straight-ahead position, then
stop.
8.
Select “DATA MONITOR”, “ECU INPUT SIGNALS”, and “STR ANGLE SIG” on CONSULT-II screen. Then
make sure that “STR ANGLE SIG” is within 0
±
2.5
°
. If value is more than specification, repeat steps 1 to 7.
9.
Erase memory of VDC/TCS/ABS control unit and ECM. Refer to
BRC-26, "How to Erase Self-Diagnostic
.
10. Turn ignition switch OFF.
Situation
Adjustment of Steering Angle Sensor Neutral Position
Removing/Installing VDC/TCS/ABS control unit
−
Replacing VDC/TCS/ABS control unit
×
Removing/Installing steering angle sensor
×
Removing/Installing steering components
×
Removing/Installing suspension components
×
Change tires to new ones
–
Tire rotation
–
Adjusting wheel alignment
×
SFIA1659E
SYSTEM DESCRIPTION
BRC-7
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
SYSTEM DESCRIPTION
PFP:00000
System Diagram
NFS000CK
COMPONENTS FUNCTION DESCRIPTION
Functions
NFS000CL
VDC
●
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.
●
During VDC operation, SLIP indicator lamp flashes to inform driver of VDC operation.
●
Electrical system diagnosis by CONSULT-II is available.
PFIA0692E
Component
Description
VDC/TCS/ABS control unit
Receives the information of various sensor signals, ECM and TCM, and then determines the vehi-
cle driving status. Performs the calculations of target brake fluid pressure, by VDC actuator drive
signal output and by engine torque required from the VDC/TCS/ABS control.
VDC actuator
Receives the actuator drive signal from VDC/TCS/ABS control unit, and then performs the brake
fluid adjustment of each wheel caliper.
Yaw rate/side G sensor
Detects the yaw rate and side G of the vehicle.
Steering angle sensor
Detects the operating angle and direction of driver steering wheel.
Pressure sensor
(Integrated in VDC actuator)
Detects the fluid pressure (driver brake force) in VDC actuator.
Wheel sensor
Detects the rotation speed of each wheel.
VDC OFF switch
Cancels the VDC/TCS function.
ECM
Receives the command from VDC/TCS/ABS control unit, and then performs the controls of throttle
motor and injector.
BRC-8
[VDC/TCS/ABS]
SYSTEM DESCRIPTION
TCS
●
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.
●
During TCS operation, it informs driver of system operation by flashing SLIP indicator lamp.
●
Electrical system diagnosis by CONSULT-II is available.
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 wheels lock. Maneuverability is also
improved for avoiding obstacles.
●
Electrical system diagnosis by CONSULT-II is available.
EBD
●
Electronic Brake Distribution is a function that detects subtle slippages between the front and rear tire dur-
ing braking, and it improves handling stability by electronically controlling the brake fluid pressure which
results in reduced rear tire slippage.
●
Electrical system diagnosis by CONSULT-II is available.
Operation that is not “System Error”
NFS000CM
VDC
●
During VDC operation, body and brake pedal lightly vibrate and mechanical noises may be heard. This is
normal.
●
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 warning
lamp, VDC OFF indicator lamp, and SLIP indicator lamp turn off after restart, it is normal.
●
When starting TCS or VDC under rapid acceleration or hard turn, operating noise by brake pedal is gener-
ated. However, this is not something wrong. This is because TCS and VDC are functioning normally.
●
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 indi-
cator lamp and SLIP indicator lamp turn off after restart, it is normal.
●
A malfunction oriented Yaw rate / side G sensor may occur under hard turn like spin turn, rapid accelera-
tion turn, drift run, etc. when VDC function is OFF (VDC OFF switch on). It is not something wrong if it is
possible to return to a normal position after restarting engine. Then erase the memory of Self-Diagnosis.
Refer to
BRC-26, "How to Erase Self-Diagnostic Results"
TCS
●
During TCS operation, body and brake pedal lightly vibrate and mechanical noises may be heard. This is
normal.
●
Depending on road circumstances, driver may have a sluggish feel. This is normal, because optimum
traction has highest priority under TCS operation.
●
When vehicle is passing through a road where surface friction coefficient varies, downshifting or depress-
ing accelerator pedal fully may activate TCS temporarily.
ABS
●
When starting engine or just after starting vehicle, brake pedal may vibrate or the motor operating noise
may be heard from engine room. This is a normal states of the operation check.
●
During ABS operation, brake pedal lightly vibrates and a mechanical noise may be heard. This is normal.
●
Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel,
or snow-covered (fresh, deep snow) roads.
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