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
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-
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
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
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