Infiniti QX56 (Z62). Manual - part 138

SYSTEM

BRC-37

< SYSTEM DESCRIPTION >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

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

*: Communication line between yaw rate/side/decal G sensor and ABS actuator and electric unit (control unit)

BRAKE LIMITED SLIP DIFFERENTIAL (BLSD) FUNCTION

BRAKE LIMITED SLIP DIFFERENTIAL (BLSD) FUNCTION : System Description

INFOID:0000000006222577

• LH and RH driving wheel spin is always monitored. If necessary, appropriate brake force is independently

applied to LH or RH driving wheel so that one-sided wheel spin is avoided and traction is maintained. Mainly
starting ability is improved.

JPFIC0145GB

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 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

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 signal

BRC-38

< SYSTEM DESCRIPTION >

[WITH VDC]

SYSTEM

• Brake limited slip differential (BLSD) function operates while VDC function is in non-operational status (OFF)

by VDC OFF switch.

•  VDC warning lamp blinking while brake limited slip differential (BLSD) 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 brake limited slip differen-

tial (BLSD) function operates. This is not a malfunction because it is caused by brake limited slip differential
(BLSD) function that is normally operated.

• Fail-safe function is adopted. When a malfunction occurs in brake limited slip differential (BLSD) function,

the control is suspended for VDC function, TCS function, hill start assist function and brake limited slip differ-
ential (BLSD) function. The vehicle status becomes the same as models without VDC function, TCS func-
tion, hill start assist function and brake limited slip differential (BLSD) function. However, ABS function and
EBD function are operated normally. Refer to 

BRC-25, "Fail-safe"

.

SYSTEM DIAGRAM

NOTE:
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.

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

SYSTEM

BRC-39

< SYSTEM DESCRIPTION >

[WITH VDC]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

*1: Communication line between yaw rate/side/decal G sensor and ABS actuator and electric unit (control unit)
*2: Models with 4WD system

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

Component

Signal description

BRC-40

< SYSTEM DESCRIPTION >

[WITH VDC]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]

CONSULT-III Function

INFOID:0000000006222578

APPLICATION ITEMS

CONSULT-III can display each diagnostic item using the diagnostic test modes as follows.

*

: The following diagnosis information is erased by erasing.

• DTC

• Freeze frame data (FFD)

ECU IDENTIFICATION

ABS actuator and electric unit (control unit) part number can be read.

SELF DIAGNOSTIC RESULT

Refer to 

BRC-51, "DTC Index"

. 

When “CRNT” is displayed on self-diagnosis result,

• The system is presently malfunctioning.

When “PAST” is displayed on self-diagnosis result,

• System malfunction in the past is detected, but the system is presently normal.

Freeze frame data (FFD)

DATA MONITOR

×

: Applicable

Mode

Function description

ECU identification

Parts number of ABS actuator and electric unit (control unit) can be read.

Self Diagnostic Result

Self-diagnostic results and freeze frame data can be read and erased quickly.

*

DATA MONITOR

Input/Output data in the ABS actuator and electric unit (control unit) can be read.

ACTIVE TEST

Diagnostic Test Mode in which CONSULT-III drives some actuators apart from the ABS actuator and 
electric unit (control unit) and also shifts some parameters in a specified range.

WORK SUPPORT

Components can be quickly and accurately adjusted.

Item name

Display item

IGN counter
(0 

−

 39)

The number of times that ignition switch is turned ON after the DTC is detected is displayed.
• When “0” is displayed: It indicates that the system is presently malfunctioning.
• When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system is pres-

ently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1 

→

 2 

→

 3...38 

→

 39. When 

the operation number of times exceeds 39, the number do not increase and “39” is displayed until self-diagnosis 
is erased.

Item (Unit)

Monitor item selection

Note

INPUT SIGNALS

MAIN ITEMS

FR LH SENSOR
[km/h (MPH)]

×

×

Wheel speed calculated by front LH wheel sensor is dis-
played.

FR RH SENSOR
[km/h (MPH)]

×

×

Wheel speed calculated by front RH wheel sensor is dis-
played.

RR LH SENSOR
[km/h (MPH)]

×

×

Wheel speed calculated by rear LH wheel sensor is dis-
played.

RR RH SENSOR
[km/h (MPH)]

×

×

Wheel speed calculated by rear RH wheel sensor is dis-
played.

DECEL G-SEN
(G)

×

×

Decel G detected by decel G sensor is displayed.