Nissan Pathfinder. Manual - part 242

SYSTEM

BRC-27

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

ABS FUNCTION : System Description

INFOID:0000000009177252

• By preventing wheel lock through brake force (brake fluid pressure) control that is electronically controlled by

detecting wheel speed during braking, stability during emergency braking is improved so that obstacles can

be avoided by steering operation.

• During braking, control unit calculates wheel speed and pseudo-vehicle speed, and transmits pressure

increase, hold or decrease signals to actuator portion according to wheel slip status.

• The following effects are obtained by preventing wheel lock during

braking.

- Vehicle tail slip is prevented during braking when driving straight.

- Understeer and oversteer tendencies are moderated during brak-

ing driving on a corner.

- Obstacles may be easily bypassed by steering operation during

braking.

• CONSULT can be used to diagnose the system diagnosis.

• Fail-safe function is adopted. When a malfunction occurs in ABS

function, the control is suspended for VDC function, TCS function,

ABS function and hill start assist function. The vehicle status

becomes the same as models without VDC function, TCS function,

ABS function and hill start assist function. However, EBD function

is operated normally. Refer to 

BRC-19, "Fail-Safe"

.

NOTE:

• ABS has the characteristic as described here. This is not the

device that helps reckless driving.

• To stop vehicle efficiently, ABS does not operate and ordinary

brake operates at low speed [approx. 10 km/h (6 MPH) or less but

differs subject to road conditions].

• Self-diagnosis is performed immediately after when engine starts

and when vehicle initially is driven [by vehicle speed approx. 15

km/h (9 MPH)]. Motor sounds are generated during self-diagnosis.

In addition, brake pedal may feel heavy when depressing brake

pedal lightly. These symptoms are not malfunctions.

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

EBD FUNCTION

JPFIC0140GB

Component

Signal description

Steering angle sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication:
• Steering angle sensor signal

Combination meter

Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication:
• ABS warning lamp signal
• VDC warning lamp signal

BRC-28

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

EBD FUNCTION : System Diagram

INFOID:0000000009177253

EBD FUNCTION : System Description

INFOID:0000000009177254

• By preventing rear wheel slip increase through rear wheel brake force (brake fluid pressure) control that is

electronically controlled when slight skip on front and rear wheels are detected during braking, stability dur-

ing braking is improved.

• EBD function is expanded and developed from conventional ABS function and corrects rear wheel brake

force to appropriate level by electronic control according to load weight (number of passengers).

ALFIA0328GB

JPFIC0142GB

SYSTEM

BRC-29

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

• During braking, control unit portion compares slight slip on front

and rear wheels by wheel speed sensor signal, transmits drive sig-

nal to actuator portion when rear wheel slip exceeds front wheel

slip for the specified value or more, and controls rear wheel brake

force (brake fluid pressure) so that increase of rear wheel slip is

prevented and slips on front wheel and rear wheel are nearly

equalized. ABS control is applied when slip on each wheel

increases and wheel speed is the threshold value of ABS control or

less.

• CONSULT can be used to diagnose the system.

• Fail-safe function is adopted. When a malfunction occurs in EBD

function, the control is suspended for VDC function, TCS function,

ABS function, EBD function and hill start assist function. The vehi-

cle status becomes the same as models without VDC function,

TCS function, ABS function, EBD function and hill start assist func-

tion. Refer to 

BRC-19, "Fail-Safe"

.

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

Hill start assist FUNCTION

JPFIC0143GB

Component

Signal description

Combination meter

Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN 
communication:
• Brake warning lamp signal
• ABS warning lamp signal
• VDC warning lamp signal

BRC-30

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

Hill start assist FUNCTION : System Diagram

INFOID:0000000009177255

Hill start assist FUNCTION : System Description

INFOID:0000000009177256

• This function maintains brake fluid pressure so that the vehicle does not move backwards, even if brake

pedal is released to depress accelerator pedal to start the vehicle, while it is stopped on an uphill slope by

depressing brake pedal.

• This function operates when the vehicle is in stop status on an uphill slope of slope ratio 10% or more and

selector lever is in any position other than P (Park) or N (Neutral).

• Hill start assist function is only for the start aid. It maintains the brake fluid pressure for approx. 2 seconds

after releasing the brake pedal, and then decreases the pressure gradually. If the vehicle starts by accelera-

tor operation, the brake is released automatically and a smooth start is performed.

• Fail-safe function is adopted. When a malfunction occurs in hill start assist function, the control is suspended

for VDC function, TCS function and hill start assist function. The vehicle status becomes the same as mod-

els without VDC function, TCS function and hill start assist function. However, ABS function and EBD func-

tion are operated normally. Refer to 

BRC-19, "Fail-Safe"

.

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table.

ALFIA0329GB

Component

Signal description

Yaw rate/side/decel G sensor

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via com-
munication line *:
• Yaw rate signal
• Side G sensor signal
• Decel G sensor signal

ECM

Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN 
communication:
• Accelerator pedal position signal
• Engine speed signal
Mainly receives the following signal from ABS actuator and electric unit (control unit) via CAN 
communication:
• Target throttle position signal