BRC-26
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
VDC/TCS/ABS : ABS Function
INFOID:0000000012430839
SYSTEM DIAGRAM
• By preventing wheel lock through brake force (brake flui d pressure) control that is electronically controlled by
detecting wheel speed during braking, stability during em ergency 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.
Refer to BRC-28, "
VDC/TCS/ABS : Fail-safe".
INPUT SIGNAL AND OUTPUT SIGNAL
AWFIA0808GB
JPFIC0140GB
Revision: August 2015 2016 Versa Note
cardiagn.com
BRC-38
< ECU DIAGNOSIS INFORMATION >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
N POSI SIGTransmission range switch signal ON/OFF
condition CVT shift position = N position
On
CVT shift position = other than N position Off
P POSI SIG Transmission range switch signal ON/OFF
condition CVT shift position = P position
On
CVT shift position = other than P position Off
CV1 ABS actuator cut valve 1 When the cut valve is active
On
When the cut valve is inactive Off
CV2 ABS actuator cut valve 2 When the cut valve is active
On
When the cut valve is inactive Off
SV1 ABS actuator suction valve When the suction valve is active
On
When the suction valve is inactive Off
SV2 ABS actuator suction valve 2 When the suction valve is active
On
When the suction valve is inactive Off
ACCEL POS SIG Throttle actuator opening/closing is dis-
played (linked with accelerator pedal) Accelerator pedal not depressed (ignition
switch is ON)
0 %
Depress accelerator pedal (ignition
switch is ON) 0 - 100 %
SIDE G-SENSOR Transverse G detected by side G sensor Vehicle stopped
Approx. 0 m/s
2
Vehicle turning rightNegative value
(m/s2)
Vehicle turning left Positive value
(m/s
2)
STR ANGLE SIG Steering angle detected by steering angle
sensor Straight-ahead
Approx. 0°
Steering wheel turned –720 to 720°
PRESS SENSOR Brake fluid pressure detected by pressure
sensor With ignition switch turned ON and brake
pedal released
Approx. 0 bar
With ignition switch turned ON and brake
pedal depressed –40 to 300 bar
EBD SIGNAL EBD operation EBD is active
On
EBD is inactive Off
ABS SIGNAL ABS operation ABS is active
On
ABS is inactive Off
TCS SIGNAL TCS operation TCS is active
On
TCS is inactive Off
VDC SIGNAL VDC operation VDC is active
On
VDC is inactive Off
EBD FAIL SIG EBD fail-safe signal In EBD fail-safe
On
EBD is normal Off
ABS FAIL SIG ABS fail-safe signal In ABS fail-safe
On
ABS is normal Off
TCS FAIL SIG TCS fail-safe signal In TCS fail-safe
On
TCS is normal Off
VDC FAIL SIG VDC fail-safe signal In VDC fail-safe
On
VDC is normal Off
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: August 2015 2016 Versa Note
cardiagn.com