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Infiniti M35/M45 Y50. Manual - part 326

PREPARATION

BRC-5

[VDC/TCS/ABS]

BRC

PREPARATION

PFP:00002

Special Service Tools

NFS000Q2

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Commercial Service Tools

NFS000Q3

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
(

—

)

a: 76.3 mm (3.00 in) dia.
b: 67.9 mm (2.67 in) dia.

ZZA0701D

ZZA0832D

Tool name

Description

1. Flare nut crowfoot
a: 10 mm (0.39 in) / 12mm (0.47 in)
2. Torque wrench

Installing brake tube

S-NT360

BRC-6

[VDC/TCS/ABS]

ON-VEHICLE SERVICE

PFP:00000

Adjustment of Steering Angle Sensor Neutral Position

NFS000Q4

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.)

Stop vehicle with front wheels in straight-ahead position.

Perform “CONSULT-II Starting Procedure”. Refer to

GI-38, "CONSULT-II Start Procedure"

Turn ignition switch ON and touch the CONSULT-II screen in the order of “ABS”, “WORK SUPPORT” and
“ST ANG SEN ADJUSTMENT”.

Touch “START”.

CAUTION:

Do not touch steering wheel while adjusting steering angle
sensor.

After approximately 10 seconds, touch “END”. (After approxi-
mately 60 seconds, it ends automatically.)

Turn ignition switch OFF, then turn it ON again.

CAUTION:

Be sure to perform above operation.

Run vehicle with front wheels in straight-ahead position, then
stop.

Select “DATA MONITOR”, “ECU INPUT SIGNALS”, and “STR ANGLE SIG” on CONSULT-II screen. Then
make sure “STR ANGLE SIG” is within 0

2.5

. If value is more than specification, repeat steps 1 to 7.

Erase memory of ABS actuator and electric unit (control unit) and ECM. ABS actuator and electric unit
(control unit): Refer to

BRC-24, "ERASE MEMORY"

. ECM: Refer to

EC-90, "TROUBLE DIAGNOSIS"

(VQ35DE),

EC-792, "TROUBLE DIAGNOSIS"

(VK45DE).

10. Turn ignition switch OFF.

Situation

Adjustment of Steering Angle Sensor Neutral Position

Removing/Installing ABS actuator and electric unit (control unit)

−

Replacing ABS actuator and electric unit (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

SFIA0793E

SYSTEM DESCRIPTION

BRC-7

[VDC/TCS/ABS]

BRC

SYSTEM DESCRIPTION

PFP:00000

System Diagram

NFS000Q5

Functions

NFS000Q6

ABS

●

Anti-Lock Brake System is a function that detects wheel revolution while braking, electronically controls
braking force, and prevents wheel locking during sudden braking. It improves handling stability and
maneuverability for avoiding obstacles.

●

Electrical system diagnosis by CONSULT-II is available.

EBD

●

Electronic Brake force Distribution is a following function. ABS actuator and electric unit (control unit)
detects subtle slippages between the front and rear wheels during braking. Then it electronically controls
the rear braking force (brake fluid pressure) to reducing and reduces rear wheel slippage. Accordingly it
improves vehicle stability.

●

Electrical system diagnosis by CONSULT-II is available.

Electric line

Brake hydraulic line

ECM

TCM

Steering angle sensor

Warning lamp, indicator lamp
(combination meter)

AWD control unit
(AWD models)

ICC sensor integrated unit
(with ICC)

RAS control unit
(with RAS)

10. Injector operation signal

11.

CAN communication

12. Front RH wheel sensor

13. Front LH wheel sensor

14. Master cylinder

15. ABS actuator and electric unit (con-

trol unit)

16. VDC OFF switch

17. Yaw rate/side G sensor

18. Rear RH wheel sensor

19. Rear LH wheel sensor

SFIA2722J

BRC-8

[VDC/TCS/ABS]

SYSTEM DESCRIPTION

TCS

●

Traction Control System is a function that electronically controls engine torque, brake fluid pressure and
A/T gear position to ensure the optimum slippage ratio at drive wheels by computing wheel speed signals
from 4 wheel sensors. When ABS actuator and electric unit (control unit) detects a spin at drive wheels
(rear wheels), it compares wheel speed signals from all 4 wheels. At this time, LH and RH rear brake fluid
pressure are controlled, while fuel being cut to engine and throttle valve being closed to reduce engine
torque by the control unit. Further more, throttle position is continuously controlled to ensure the optimum
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.

VDC

●

Vehicle Dynamics Control system 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 vehicle driving
stability by controlling brake application to 4 wheels and engine output.

●

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

●

Electrical system diagnosis by CONSULT-II is available.

ECD

Receives deceleration degree commandment value signal from ICC sensor integrated unit, and controls brake
fluid pressure with the motor [built-in ABS actuator and electric unit (control unit)].

Operation That Is Not "System Error"

NFS000Q7

ABS

●

When starting engine or just after starting vehicle, brake pedal may vibrate or the motor operating sound
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 sound 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.

TCS

●

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 varies, downshifting or depressing acceler-
ator pedal fully may activate TCS temporarily.

VDC

●

During VDC operation, body and brake pedal lightly vibrate and mechanical sounds 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 warn-
ing 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 sound by brake pedal is gen-
erated. However, this is not malfunction. This is because TCS and VDC are functioning normally.

●

VDC may not operate normally or ABS warning lamp, VDC OFF indicator lamp and SLIP indicator lamp
may turn on when driving special roads with extremely steep slant (banks on circuit road and so on.) How-
ever, it is not malfunction when returning to a normal state after restarting the engine. In that case, be sure
to erase the memory of self-diagnosis. Refer to

BRC-24, "ERASE MEMORY"

●

Yaw rate /side G sensor malfunction may occur under hard turn like spin turn, rapid acceleration turn, drift
run, etc., when VDC function is OFF (VDC OFF switch is turned on). It is not malfunction if it is possible to
return to a normal position after restarting engine. Then erase the memory of self-diagnosis. Refer to

BRC-24, "ERASE MEMORY"

●

VDC OFF indicator lamp and SLIP indicator lamp may simultaneously turn on when low tire pressure
warning lamp turns on. This is not a VDC system error but results from characteristic change of tires.

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