Infiniti QX56 (Z62). Manual - part 139

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-41

< SYSTEM DESCRIPTION >

[WITH VDC]

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FR RH IN SOL
(On/Off)

×

Operation status of front RH wheel ABS IN valve is dis-
played.

FR RH OUT SOL
(On/Off)

×

Operation status of front RH wheel ABS OUT valve is dis-
played.

FR LH IN SOL
(On/Off)

×

Operation status of front LH wheel ABS IN valve is dis-
played.

FR LH OUT SOL
(On/Off)

×

Operation status of front LH wheel ABS OUT valve is dis-
played.

RR RH IN SOL
(On/Off)

×

Operation status of rear RH wheel ABS IN valve is displayed

RR RH OUT SOL
(On/Off)

×

Operation status of rear RH wheel ABS OUT valve is dis-
played.

RR LH IN SOL
(On/Off)

×

Operation status of rear LH wheel ABS IN valve is dis-
played.

RR LH OUT SOL
(On/Off)

×

Operation status of rear LH wheel ABS OUT valve is dis-
played.

EBD WARN LAMP
(On/Off)

Brake warning lamp ON/OFF status is displayed. 

(Note 1)

STOP LAMP SW
(On/Off)

×

×

Stop lamp switch signal input status is displayed.

MOTOR RELAY
(On/Off)

×

ABS motor and motor relay status is displayed.

ACTUATOR RLY
(On/Off)

×

ABS actuator relay status is displayed.

ABS WARN LAMP
(On/Off)

×

ABS warning lamp ON/OFF status is displayed. 

(Note 1)

OFF LAMP
(On/Off)

×

VDC OFF indicator lamp ON/OFF status is displayed.

(Note 1)

OFF SW
(On/Off)

×

×

VDC OFF switch signal input status is displayed.

SLIP/VDC LAMP
(On/Off)

×

VDC warning lamp ON/OFF status is displayed.

(Note 1)

BATTERY VOLT
(V)

×

×

Voltage supplied to ABS actuator and electric unit (control 
unit) is displayed.

GEAR

×

×

Current gear position judged from current gear position sig-
nal is displayed.

ENGINE SPEED
(tr/min)

×

×

Engine speed status is displayed.

YAW RATE SEN
(d/s)

×

×

Yaw rate detected by yaw rate sensor is displayed.

R POSI SIG
(On/Off)

R range signal input status judged from R range signal is 
displayed.

4WD MODE MON

(Note 2)

(AUTO/LOCK/##)

×

×

4WD control status is displayed.

N POSI SIG
(On/Off)

N range signal input status judged from N range signal is 
displayed.

CV1
(On/Off)

Cut valve 1 operation status is displayed.

CV2
(On/Off)

Cut valve 2 operation status is displayed.

SV1
(On/Off)

Suction valve 1 operation status is displayed.

Item (Unit)

Monitor item selection

Note

INPUT SIGNALS

MAIN ITEMS

BRC-42

< SYSTEM DESCRIPTION >

[WITH VDC]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

Note 1: Refer to 

BRC-16, "System Description"

 for ON/OFF conditions of each warning lamp and indicator

lamp.
Note 2: Models with 4WD System
Note 3: Models with Advanced Driver Assistance System
Note 4: USS means “hill start assist”

ACTIVE TEST

The active test is used to determine and identify details of a malfunction, based on self-diagnosis test result
sand data obtained in the DATA MONITOR. In response to instructions from CONSULT-III, instead of those

SV2
(On/Off)

Suction valve 2 operation status is displayed.

STOP LAMP SW2
(On/Off)

Stop lamp switch signal input status is displayed.

ACCEL POS SIG
(%)

×

Displays the Accelerator pedal position

SIDE G-SENSOR

(m/s

2

)

×

Side G detected by side G sensor is displayed.

STR ANGLE SIG
(

°

)

×

Steering angle detected by steering angle sensor is dis-
played.

PRESS SENSOR
(bar)

×

Detects the brake fluid pressure of master cylinder part is 
displayed.

ACCUM PRESS SEN
(bar)

Detects the brake fluid pressure of accumulator is dis-
played.

CONT PRESS SEN

(Note 3)

(bar)

Detects the brake fluid pressure of control pressure sensor 
is displayed

EBD SIGNAL
(On/Off)

EBD operation status is displayed.

ABS SIGNAL
(On/Off)

ABS operation status is displayed.

TCS SIGNAL
(On/Off)

TCS operation status is displayed.

VDC SIGNAL
(On/Off)

VDC operation status is displayed.

EBD FAIL SIG
(On/Off)

EBD fail-safe signal status is displayed.

ABS FAIL SIG
(On/Off)

ABS fail-safe signal status is displayed.

TCS FAIL SIG
(On/Off)

TCS fail-safe signal status is displayed.

VDC FAIL SIG
(On/Off)

VDC fail-safe signal status is displayed.

CRANKING SIG
(On/Off)

Cranking status is displayed.

FLUID LEV SW
(On/Off)

×

Brake fluid level signal input status via CAN communication 
is displayed.

PARK BRAKE SW
(On/Off)

×

Parking brake switch signal input status via CAN communi-
cation is displayed.

STP ON RLY
(On/Off)

Stop lamp switch relay status is displayed.

USS SIG

(Note 4)

(On/Off)

hill start assist operation status is displayed.

Item (Unit)

Monitor item selection

Note

INPUT SIGNALS

MAIN ITEMS

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-43

< SYSTEM DESCRIPTION >

[WITH VDC]

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from ABS actuator and electric unit (control unit) on the vehicle, a drive signal is sent to the actuator to check
its operation.

CAUTION:

• Never perform ACTIVE TEST while driving the vehicle.
• Always bleed air from brake system before active test.
• Never perform active test when system is malfunctioning.
NOTE:
• When active test is performed while depressing the pedal, the pedal depressing stroke may change. This is

not a malfunction.

• “TEST IS STOPPED” is displayed approx. 10 seconds after operation start.
• When performing active test again after “TEST IS STOPPED” is displayed, select “BACK”.
• ABS warning lamp, brake warning lamp and VDC warning lamp may turn ON during active test. This is not a

malfunction.

ABS IN Valve and ABS OUT Valve

When “Up”, “Keep” or “Down” is selected on display screen, the following items are displayed when system is
normal.

*: Immediately after being selected, status is “On”. Status changes to “Off” after approx. 2 seconds.

ABS IN Valve (ACT) and ABS OUT Valve (ACT)

When “Up”, “ACT KEEP” or “ACT UP” is selected on display screen, the following items are displayed when
system is normal.

Test item

Display Item

Display

Up

Keep

Down

FR RH SOL

FR RH IN SOL

Off

On*

On*

FR RH OUT SOL

Off

Off

On*

FR LH SOL

FRLH IN SOL

Off

On*

On*

FR LH OUT SOL

Off

Off

On*

RR RH SOL

RR RH IN SOL

Off

On*

On*

RR RH OUT SOL

Off

Off

On*

RR LH SOL

RR LH IN SOL

Off

On*

On*

RR LH OUT SOL

Off

Off

On*

Test item

Display Item

Display

Up

ACT KEEP

ACT UP

FR RH SOL (ACT)

FR RH IN SOL

Off

Off

On*

FR RH OUT SOL

Off

Off

Off

CV1

Off

On*

On*

SV1

Off

Off

On*

FR LH SOL (ACT)

FR LH IN SOL

Off

Off

On*

FR LH OUT SOL

Off

Off

Off

CV1

Off

On*

On*

SV1

Off

Off

On*

RR RH SOL (ACT)

RR RH IN SOL

Off

Off

On*

RR RH OUT SOL

Off

Off

Off

CV2

Off

On*

On*

SV2

Off

Off

On*

RR LH SOL (ACT)

RR LH IN SOL

Off

Off

On*

RR LH OUT SOL

Off

Off

Off

CV2

Off

On*

On*

SV2

Off

Off

On*

BRC-44

< SYSTEM DESCRIPTION >

[WITH VDC]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

*: Immediately after being selected, status is “On”. Status changes to “Off” after approx. 2 seconds.

Stop Lamp ON Relay

When “On” or “Off” is selected on display screen, the following items are displayed when system is normal.

NOTE:
Display occasionally changes On/Off for a moment after ignition switch is turned ON. This is operation for
checking purposes and is not a malfunction.

WORK SUPPORT

Test item

Display Item

Display

On

Off

STOP LAMP ON RELAY

STOP LAMP ON RELAY

On

Off

Conditions

Description

ST ANGLE SENSOR ADJUSTMENT

Perform neutral position adjustment of steering angle sensor.

DECEL G SENSOR CALIBRATION

Perform decel G sensor calibration.