Nissan Versa Sedan. Manual — part 108
SYSTEM
BRC-25
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VDC Function That Prevents Understeer Tendency
• During cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the inner
side of turn. Momentum is generated directing the vehicle toward the inner side of the turn. Understeer is
prevented.
• Applying brakes during cornering on a slippery road, when there may be a tendency to understeer, engine
output is controlled as well as brake force (brake fluid pressure) of 4 wheels. Understeer tendency
decreases.
VDC/TCS/ABS : TCS Function
INFOID:0000000009267596
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
JPFIC0137GB
JPFIC0138GB
AWFIA0807GB
BRC-26
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
• Wheel spin status of drive wheel is detected by wheel sensor of 4
wheels. Engine output and transmission shift status is controlled
so that slip rate of drive wheels is in appropriate level. When wheel
spin occurs on drive wheel, ABS actuator and electric unit (control
unit) perform brake force control of LH and RH drive wheels (apply
brake force by increasing brake fluid pressure of drive wheel) and
decrease engine torque by engine torque control. Wheel spin
amount decreases. Engine torque is controlled to appropriate
level.
• TCS function can be switched to non-operational status (OFF) by
operating VDC OFF switch. In this case, VDC OFF indicator lamp
turns ON.
• SLIP indicator lamp blinks while TCS function is in operation and
indicates to the driver that the function is in operation.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in TCS
function, the control is suspended for VDC function and TCS func-
tion. However, ABS function and EBD function operate normally.
.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JPFIC0139GB
Component
Signal description
ECM
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM
Transmits the current gear position signal to ABS actuator and electric unit (control unit) via
CAN communication.
Steering angle sensor
Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via
CAN communication.
Combination meter
Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• Parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
SYSTEM
BRC-27
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VDC/TCS/ABS : ABS Function
INFOID:0000000009267597
SYSTEM DIAGRAM
• 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 easily bypassed by steering operation.
• During braking, control units calculate wheel speed and pseudo-vehicle speed, and transmit 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 while cornering.
- Obstacles may be easily bypassed by steering operation during
braking.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in ABS
function, the control is suspended for VDC function, TCS function
and ABS function. However, EBD function operates normally.
BRC-29, "VDC/TCS/ABS : Fail-safe"
INPUT SIGNAL AND OUTPUT SIGNAL
AWFIA0808GB
JPFIC0140GB
BRC-28
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
Major signal transmission between each unit via communication lines is shown in the following table.
VDC/TCS/ABS : EBD Function
INFOID:0000000009267598
SYSTEM DIAGRAM
• 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).
Component
Signal description
Combination meter
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• VDC warning lamp signal
• ABS warning lamp signal
AWFIA0808GB
JPFIC0142GB
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