Nissan Sentra. Manual - part 161

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-31

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

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

CONSULT Function (ABS)

INFOID:0000000009757823

FUNCTION

CONSULT can display each diagnostic item using the following direct diagnostic modes.

ECU IDENTIFICATION

ABS actuator and electric unit (control unit) part number is displayed.

SELF DIAGNOSTIC RESULT

Operation Procedure

1. Before performing the self-diagnosis, start engine and drive vehicle at 30 km/h (19 MPH) or more for

approximately 1 minute.

How To Erase Self Diagnostic Result

1. After erasing DTC memory, start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately

1 minute as the final inspection, and make sure that the ABS warning lamp, VDC OFF indicator lamp,

SLIP indicator lamp and brake warning lamp turn OFF.

CAUTION:

If memory cannot be erased, perform applicable diagnosis.

NOTE:

• When the wheel sensor malfunctions, after inspecting the wheel sensor system, the ABS warning lamp,

SLIP indicator lamp and brake warning lamp will not turn OFF even when the system is normal, unless

the vehicle is driven at approximately 30 km/h (19 MPH) or more for approximately 1 minute.

• Brake warning lamp will turn ON in case of parking brake operation (when switch is ON) or of brake fluid

level switch operation (when brake fluid is insufficient).

• VDC OFF switch should not stay in ON position.

Display Item List

Refer to 

BRC-43, "DTC Index"

.

DATA MONITOR

Direct Diagnostic Mode

Description

ECU identification

The ABS actuator and electric unit (control unit) part number is displayed.

Self Diagnostic Result

The ABS actuator and electric unit (control unit) self diagnostic results are displayed.

Data Monitor

The ABS actuator and electric unit (control unit) input/output data is displayed in real time.

Active Test

The ABS actuator and electric unit (control unit) activates outputs to test components.

Work support

The settings for ABS actuator and electric unit (control unit) functions can be changed.

CAN DIAG SUPPORT MNTR

The result of transmit/receive diagnosis of CAN communication is displayed.

Item

(Unit)

Data monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELECTION

FROM MENU

FR LH SENSOR 
 (km/h, mph)

×

×

×

Wheel speed (km/h, mph) calculated by front wheel 
sensor LH signal is displayed.

FR RH SENSOR 
 (km/h, mph)

×

×

×

Wheel speed (km/h, mph) calculated by front wheel 
sensor RH signal is displayed.

RR LH SENSOR 
 (km/h, mph)

×

×

×

Wheel speed (km/h, mph) calculated by rear wheel 
sensor LH signal is displayed.

RR RH SENSOR
 (km/h, mph)

×

×

×

Wheel speed (km/h, mph) calculated by rear wheel 
sensor RH signal is displayed.

BRC-32

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

DECEL G-SEN
 (G)

×

×

 

×

Longitudinal acceleration (G) detected by decel G-
sensor is displayed. 

FR RH IN SOL
(On/Off)

–

×

×

Front RH IN ABS solenoid (On/Off) status is dis-
played.

FR RH OUT SOL
(On/Off)

–

×

×

Front RH OUT ABS solenoid (On/Off) status is dis-
played.

FR LH IN SOL
(On/Off)

–

×

×

Front LH IN ABS solenoid (On/Off) status is displayed.

FR LH OUT SOL
(On/Off)

–

×

×

Front LH OUT ABS solenoid (On/Off) status is dis-
played.

RR RH IN SOL
(On/Off)

–

×

×

Rear RH IN ABS solenoid (On/Off) status is displayed.

RR RH OUT SOL
(On/Off) 

–

×

×

Rear RH OUT ABS solenoid (On/Off) status is dis-
played.

RR LH IN SOL
(On/Off)

–

×

×

Rear LH IN ABS solenoid (On/Off) status is displayed.

RR LH OUT SOL
(On/Off)

–

×

×

Rear LH OUT ABS solenoid (On/Off) status is dis-
played.

EBD WARN LAMP
(On/Off)

–

–

×

Brake warning lamp (On/Off) status is displayed.

STOP LAMP SW
(On/Off)

×

×

×

Stop lamp switch (On/Off) status is displayed.

MOTOR RELAY
(On/Off)

–

×

×

ABS motor relay signal (On/Off) status is displayed.

ACTUATOR RLY
(On/Off)

– 

×

×

ABS actuator relay signal (On/Off) status is displayed.

ABS WARN LAMP
(On/Off)

–

×

×

ABS warning lamp (On/Off) status is displayed.

OFF LAMP
(On/Off)

–

×

×

VDC OFF Lamp (On/Off) status is displayed.

SLIP/VDC LAMP
(On/Off)

–

×

×

SLIP indicator lamp (On/Off) status is displayed.

BATTERY VOLT
(V)

×

×

×

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

GEAR
(1, 2, 3, 4, 5)

×

×

×

Gear position (1, 2, 3, 4, 5) judged by transmission 
range switch signal is displayed.

SLCT LVR POSI

×

×

×

Current gear position judged from current gear posi-
tion signal is displayed.

YAW RATE SEN
(d/s)

×

×

×

Yaw rate (d/s) detected by yaw rate sensor is dis-
played.

R POSI SIG
(On/Off)

–

–

×

Reverse shift position (On/Off) judged by transmis-
sion range switch signal.

N POSI SIG
(On/Off)

–

–

×

Neutral position (On/Off) judged by transmission 
range switch signal.

P POSI SIG
(On/Off)

–

–

×

Park position (On/Off) judged by transmission range 
switch signal.

ACCEL POS SIG
(%)

×

–

×

Throttle valve open/close status judged by CAN com-
munication signal is displayed.

SIDE G-SENSOR
 (m/s

2

)

×

–

 

×

Transverse acceleration detected by side G-sensor is 
displayed. 

Item

(Unit)

Data monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELECTION

FROM MENU

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-33

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

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×: Applicable
–: Not applicable

ACTIVE TEST

The active test is used to determine and identify details of a malfunction, based on self-diagnosis test results

and data obtained in the DATA MONITOR. In response to instructions from CONSULT, instead of those 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.

STR ANGLE SIG
(deg)

×

–

×

Steering angle detected by steering angle sensor is 
displayed.

PRESS SENSOR
(bar)

×

–

×

Brake pressure detected by pressure sensor is dis-
played.

EBD SIGNAL
(On/Off)

–

–

×

EBD operation (On/Off) status is displayed.

ABS SIGNAL
(On/Off)

–

–

×

ABS operation (On/Off) status is displayed.

TCS SIGNAL
(On/Off)

–

–

×

TCS operation (On/Off) status is displayed.

VDC SIGNAL
(On/Off)

–

–

×

VDC operation (On/Off) status is displayed.

EBD FAIL SIG
(On/Off)

–

–

×

EBD fail signal (On/Off) status is displayed.

ABS FAIL SIG
(On/Off)

–

–

×

ABS fail signal (On/Off) status is displayed.

TCS FAIL SIG
(On/Off)

–

–

×

TCS fail signal (On/Off) status is displayed.

VDC FAIL SIG
(On/Off)

–

–

×

VDC fail signal (On/Off) status is displayed.

CRANKING SIG
(On/Off)

–

–

×

The input state of the key SW START position signal 
is displayed.

FLUID LEV SW
(On/Off)

×

–

×

Brake fluid level switch (On/Off) status is displayed.

PARK BRAKE SW
(On/Off)

×

–

×

Park brake switch (On/Off) status is displayed.

USV[FL-RR]
(On/Off)

—

—

×

Primary side USV solenoid valve (On/Off) status is 
displayed.

USV[FR-RL]
(On/Off)

—

—

×

Secondary side USV solenoid valve (On/Off) status is 
displayed.

HSV[FL-RR]
(On/Off)

—

—

×

Primary side HSV solenoid valve (On/Off) status is 
displayed.

HSV[FR-RL]
(On/Off)

—

—

×

Secondary side HSV solenoid valve (On/Off) status is 
displayed.

V/R OUTPUT
(On/Off)

—

—

×

Valve relay operation signal (On/Off) status is dis-
played.

M/R OUTPUT
(On/Off)

—

—

×

Motor relay operation signal (On/Off) status is dis-
played.

ENGINE RPM
(tr/min)

×

–

×

Engine speed judged by CAN communication signal 
is displayed.

Item

(Unit)

Data monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELECTION

FROM MENU

BRC-34

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

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 UP” or “ACT KEEP” 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. 10 seconds.

ABS MOTOR

When “On” or “Off” 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

FR LH 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 UP

ACT KEEP

FR RH ABS SOLE-
NOID (ACT)

FR RH IN SOL

Off

Off

Off

FR RH OUT SOL

Off

Off

Off

CV1

Off

Off

Off

CV2

Off

On*

On*

FR LH ABS SOLE-
NOID (ACT)

FR LH IN SOL

Off

Off

Off

FR LH OUT SOL

Off

Off

Off

CV1

Off

On*

On*

CV2

Off

Off

Off

RR RH ABS SOLE-
NOID (ACT)

RR RH IN SOL

Off

Off

Off

RR RH OUT SOL

Off

Off

Off

CV1

Off

On*

On*

CV2

Off

Off

Off

RR LH ABS SOLE-
NOID (ACT)

RR LH IN SOL

Off

On*

Off

RR LH OUT SOL

Off

Off

Off

CV1

Off

Off

Off

CV2

Off

On*

On*