Infiniti QX56 (Z62). Manual — part 136
SYSTEM
BRC-29
< SYSTEM DESCRIPTION >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
side/decel G- sensor and wheel sensor, vehicle driving conditions (conditions of understeer or oversteer) are
judged and vehicle stability is improved by brake force control on all 4 wheels and engine output control.
• Control unit portion automatically improves driving stability by performing brake force control as well as
engine output control, by transmitting drive signal to actuator portion according to difference between target
side slip amount and vehicle side slip amount
• VDC function can be switched to non-operational status (OFF) by operating VDC OFF switch. In this case,
VDC OFF indicator lamp turns ON.
• VDC function is not operate when 4WD mode is “4L”. (Models with 4WD system)
• VDC warning lamp blinking while VDC function is in operation and indicates to the driver that the function is
in operation.
• Slight vibrations are felt on the brake pedal and the operation noises occur, when VDC function operates.
This is not a malfunction because it is caused by VDC function that is normally operated.
• CONSULT-III can be used to diagnose the system diagnosis.
• Fail-safe function is adopted. When a malfunction occurs in VDC function, the control is suspended for VDC
function, TCS function, hill start assist function and brake limited slip differential (BLSD) function. The vehi-
cle status becomes the same as models without VDC function, TCS function, hill start assist function and
brake limited slip differential (BLSD) function. However, ABS function and EBD function are operated nor-
mally. Refer to
.
NOTE:
VDC has the characteristic as described here, but it is not the device that helps reckless driving.
SYSTEM DIAGRAM
NOTE:
Transfer control unit is applied to models with 4WD system.
INPUT SIGNAL AND OUTPUT SIGNAL
JPFIC0133GB
JPFIC0183GB
BRC-30
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
Major signal transmission between each unit via communication lines is shown in the following table.
*1: Communication line between yaw rate/side/decal G sensor and ABS actuator and electric unit (control unit)
*2: Models with 4WD system
OPERATION CHARACTERISTICS
VDC Function That Prevents Oversteer Tendency
• During a cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the outer
side of turn. Moment directing towards the outer side of turn is generated. Oversteer is prevented.
• Changing driving lane on a slippery road, when oversteer tendency is judged large, engine output is con-
trolled as well as brake force (brake fluid pressure) of 4 wheels. Oversteer tendency decreases.
VDC Function That Prevents Understeer Tendency
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
*1
.
• 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 signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Target throttle position signal
TCM
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Shift position signal
Transfer control unit
*2
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Current 4WD mode signal
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.
• VDC warning lamp signal
• VDC OFF indicator lamp
JPFIC0135GB
JPFIC0136GB
SYSTEM
BRC-31
< SYSTEM DESCRIPTION >
[WITH VDC]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
• During a cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the inner
side of turn. Moment directing towards the inner side of turn is generated. Understeer is prevented.
• Applying braking during a cornering on a slippery road, when understeer tendency is judged large, engine
output is controlled as well as brake force (brake fluid pressure) of four wheels. Understeer tendency
decreases.
TCS FUNCTION
TCS FUNCTION : System Description
INFOID:0000000006222573
• 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.
• TCS function is not operate when 4WD mode is “4L”. (Models with
4WD system)
• VDC warning lamp blinking while TCS function is in operation and
indicates to the driver that the function is in operation.
• Slight vibrations are felt on the brake pedal and the operation
noises occur, when TCS function operates. This is not a malfunc-
tion because it is caused by TCS function that is normally oper-
ated.
• CONSULT-III can be used to diagnose the system diagnosis.
• Fail-safe function is adopted. When a malfunction occurs in TCS
function, the control is suspended for VDC function, TCS function,
hill start assist function and brake limited slip differential (BLSD)
function. The vehicle status becomes the same as models without VDC function, TCS function, hill start
assist function and brake limited slip differential (BLSD) function. However, ABS function and EBD function
are operated normally. Refer to
.
SYSTEM DIAGRAM
NOTE:
JPFIC0137GB
JPFIC0138GB
JPFIC0139GB
BRC-32
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
Transfer control unit is applied to models with 4WD system.
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
*1: Communication line between yaw rate/side/decal G sensor and ABS actuator and electric unit (control unit)
*2: Models with 4WD system
ABS FUNCTION
JPFIC0183GB
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
*1
.
• 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 signals from ABS actuator and electric unit (control unit) via CAN
communication.
• Target throttle position signal
TCM
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Shift position signal
Transfer control unit
*2
Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Current 4WD mode signal
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.
• VDC warning lamp signal
• VDC OFF indicator lamp
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