Infiniti Q45. Manual - part 265

TROUBLE DIAGNOSIS

BRC-25

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

Display Item List

Items (CONSULT-II screen terms)

Malfunction is detected when...

Check item

FR LH SENSOR- 1

Circuit of front LH wheel sensor is open.

BRC-36, "Wheel Sensor"

(Note 1) 

RR RH SENSOR- 1

Circuit of rear RH wheel sensor is open.

FR RH SENSOR- 1

Circuit of front RH wheel sensor is open.

RR LH SENSOR- 1

Circuit of rear LH wheel sensor is open.

FR LH SENSOR- 2

When the circuit in the front LH wheel sensor is short-circuited. Or 
when the sensor power voltage is outside the standard. When the 
distance between the wheel sensor and sensor rotor is too large 
and the sensor pulse cannot be recognized by the control unit.

RR RH SENSOR- 2

When the circuit in the rear RH wheel sensor is short-circuited. Or 
when the sensor power voltage is outside the standard. When the 
distance between the wheel sensor and sensor rotor is too large 
and the sensor pulse cannot be recognized by the control unit.

FR RH SENSOR- 2

When the circuit in the front RH wheel sensor is short-circuited. Or 
when the sensor power voltage is outside the standard. When the 
distance between the wheel sensor and sensor rotor is too large 
and the sensor pulse cannot be recognized by the control unit.

RR LH SENSOR- 2

When the circuit in the rear LH wheel sensor is short-circuited. Or 
when the sensor power voltage is outside the standard. When the 
distance between the wheel sensor and sensor rotor is too large 
and the sensor pulse cannot be recognized by the control unit.

MAIN RELAY

During solenoid valve relay operating with off, when actuator relay 
turns on, or when control line for relay is shorted to ground.

BRC-46, "Actuator Motor 
and Motor Relay"

During solenoid valve relay operating with on, when actuator relay 
turns off, or when control line for relay is open.

STOP LAMP SW

Stop lamp switch circuit is open.

BRC-49, "Stop Lamp 
Switch"

PRESS SEN CIRCUIT

Pressure sensor signal line is open or shorted, or pressure sensor 
is malfunctioning.

BRC-39, "Pressure Sen-
sor"

ST ANGLE SEN CIRCUIT

Neutral position of steering angle sensor is dislocated, or steering 
angle sensor is malfunctioning.

BRC-40, "Steering Angle 
Sensor"

YAW RATE SENSOR

Yaw rate/side G sensor is malfunctioning, or the yaw rate/side G 
sensor signal line is open or shorted.

BRC-42, "Yaw Rate/Side 
G Sensor"

FR LH IN ABS SOL

When the control unit detects a malfunction in the front left inlet 
solenoid circuit.

BRC-44, "Solenoid and 
VDC Switching Valve"

FR LH OUT ABS SOL

When the control unit detects a malfunction in the front left outlet 
solenoid circuit.

RR RH IN ABS SOL

When the control unit detects a malfunction in the rear right inlet 
solenoid circuit. 

RR RH OUT ABS SOL

When the control unit detects a malfunction in the rear right outlet 
solenoid circuit. 

FR RH IN ABS SOL

When the control unit detects a malfunction in the front right inlet 
solenoid circuit. 

FR RH OUT ABS SOL

When the control unit detects a malfunction in the front right outlet 
solenoid circuit.

RR LH IN ABS SOL

When the control unit detects a malfunction in the rear left inlet 
solenoid circuit. 

RR LH OUT ABS SOL

When the control unit detects a malfunction in the rear left outlet 
solenoid circuit. 

BRC-26

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Note 1. If wheel sensor 2 for each wheel is indicated, check control unit power supply voltage in addition to wheel sensor circuit check.
Note 2. If multiple malfunctions are detected including CAN communication line, perform diagnosis for CAN communication line first.

How to Erase Self-Diagnostic Results

1.

Perform applicably inspection of malfunctioning item and then repair or replace.

2.

Start engine and drive at 30 km/h (19 MPH) or more for approx. 1 minute.

3.

Turn ignition switch “OFF” to erase memory.

4.

Start engine and select “SELF-DIAG RESULTS” mode for “VDC” with CONSULT-II.

5.

Touch “ERASE” on CONSULT-II screen to erase memory.

CAUTION:

If memory cannot be erased, perform applicably diagnosis.

PRIMARY SIDE USV CIRCUIT

When the primary side VDC switch over valve 1 circuit is open or 
short-circuited.

BRC-44, "Solenoid and 
VDC Switching Valve"

SECONDARY SIDE USV CIRCUIT

When the secondary side VDC switch over valve 1 circuit is open 
or short-circuited.

PRIMARY SIDE HSV CIRCUIT

When the primary side VDC switch over valve 2 circuit is open or 
short-circuited.

SECONDARY SIDE HSV CIRCUIT

When the secondary side VDC switch over valve 2 circuit is open 
or short-circuited.

PUMP MOTOR
ACTUATOR RLY 

During the actuator motor operating with on, when the actuator 
motor turns off, or when the control line for motor relay is open.

BRC-46, "Actuator Motor 
and Motor Relay"

During the actuator motor operating with off, when the actuator 
motor turns on, or when the control line for motor relay is shorted to 
ground.

LOW POWER VOLTAGE

When the VDC/TCS/ABS control unit power voltage is lower than 
normal.

BRC-50, "VDC/TCS/ABS 
Control Unit Power Sup-
ply And Ground Circuit"

ST ANGLE SEN SIGNAL

Neutral position correction of steering angle sensor is not finished.

BRC-6, "Adjustment of 
Steering Angle Sensor 
Neutral Position"

SIDE G-SEN CIRCUIT

Side G sensor is malfunctioning, or signal line of side G sensor is 
open or shorted.

BRC-42, "Yaw Rate/Side 
G Sensor"

EMERGENCY BRAKE

VDC/TCS/ABS control unit malfunction (pressure increase is too 
much or too little.)

BRC-38, "VDC/TCS/ABS 
Control Unit"

CONTROLLER FAILURE

Internal malfunction of VDC/TCS/ABS control unit

BRC-38, "VDC/TCS/ABS 
Control Unit"

SHIFT POSITION ERROR

P-position switch stuck to ON or TCM internal malfunction, VDC/
TCS/ABS control unit internal malfunction.

BRC-51, "Park/Neutral 
Position Switch"

BR FLUID LEVEL LOW

Brake fluid level drops or communication line between VDC/TCS/
ABS control unit and brake fluid level switch is open or shorted. 

BRC-53, "Brake Fluid 
Level Switch"

ENGINE SIGNAL 2-6

Major engine components are malfunctioning.

BRC-38, "Engine System 
Control Signal"

RAS CIRCUIT

When RAS system is malfunctioning.

BRC-55, "RAS Control 
Unit (With RAS)"

ST ANG SEN COM CIR

CAN communication line or steering angle sensor has generated 
an error.

BRC-54, "CAN Communi-
cation Circuit"

CAN COMM CIRCUIT

●

CAN communication line is open or shorted.

●

VDC/TCS/ABS control unit internal malfunction

●

Battery voltage for EMC is suddenly interrupted for approxi-
mately 0.5 seconds or more.

BRC-54, "CAN Communi-
cation Circuit"

Note 2 

NO DTC IS DETECTED.
FURTHER TESTING MAY BE 
REQUIRED.

No NG item has been detected.

—

Items (CONSULT-II screen terms)

Malfunction is detected when...

Check item

TROUBLE DIAGNOSIS

BRC-27

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

6.

Drive at 30 km/h (19 MPH) or more for approx. 1 minute. Be sure ABS warning lamp, VDC OFF indicator
lamp, and SLIP indicator lamp stay OFF.

CAUTION:

VDC OFF switch should not stay in the “ON” position.

DATA MONITOR MODE
Operation Procedure

1.

Perform “CONSULT-II Start Procedure”. Refer to 

GI-36, "CONSULT-II Start Procedure"

 .

2.

Touch “DATA MONITOR”.

3.

Select from “SELECT MONITOR ITEM”, screen of data monitor mode is displayed.

Display Item List

×

: Applicable 

−

: Not applicable

Data monitor item (Unit)

SELECT MONITOR ITEM

Remarks

ECU INPUT

SIGNALS

MAIN SIGNALS

SELECTION 

FROM MENU

N-POSI SIG (ON/OFF)

–-

–

×

N position signal status (ON/OFF) 
judged by the CAN communication sig-
nal is displayed.

R-POSI SIG (ON/OFF)

–

–

×

R position signal status (ON/OFF) 
judged by the CAN communication sig-
nal is displayed.

P-POSI SIG (ON/OFF)

–

–

×

P position signal status (ON/OFF) 
judged by the CAN communication sig-
nal is displayed.

GEAR POSITION

×

×

×

Gear position judged by the Park/Neutral 
position switch signal is displayed.

VHCL SPEED FR (km/h)

×

×

×

Wheel speed calculated by front RH 
wheel sensor signal is displayed.

VHCL SPEED FL  (km/h)

×

×

×

Wheel speed calculated by front LH 
wheel sensor signal is displayed.

VHCL SPEED RR (km/h)

×

×

×

Wheel speed calculated by rear RH 
wheel sensor signal is displayed.

VHCL SPEED RL (km/h)

×

×

×

Wheel speed calculated by rear LH 
wheel sensor signal is displayed.

THRTL OPENING (%)

×

×

×

Throttle valve open/close status judged 
by the CAN communication signal is dis-
played.

ENGINE RPM (rpm)

×

×

×

Engine speed judged by the CAN com-
munication signal is displayed.

START CAN COMM (ON/OFF)

–

–

×

Communication status of CAN communi-
cation is displayed.

ASCD SIGNAL (ON/OFF)

–

–

×

ON/OFF status of the VDC/TCS opera-
tion signal to ASCD is displayed.

STR ANGLE SIG (

°

)

×

–

×

Steering angle detected by the steering 
angle sensor is displayed.

YAW RATE SEN (D/S)

×

–

×

Yaw rate detected by the yaw rate sen-
sor is displayed.

SIDE G-SEN (m/s

2

 )

×

–

×

Transverse acceleration detected by the 
Side G sensor is displayed.

PRESS SENSOR (bar )

×

–

×

Brake fluid pressure detected by the 
pressure sensor is displayed.

ABS CONT VOLT (V )

×

×

×

Voltage supplied to VDC/TCS/
ABS control unit is displayed.

STOP LAMP SW (ON/OFF)

×

×

×

Stop lamp switch (ON/OFF) status is dis-
played.

BRC-28

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

PARK BRAKE SW (ON/OFF)

×

–

×

Parking brake switch (ON/OFF) status is 
displayed.

OFF SW (ON/OFF)

×

–

×

VDC OFF switch (ON/OFF) status is 
displayed.

ABS WARN LAMP (ON/OFF)

–

×

×

ABS warning lamp (ON/OFF) status is 
displayed.

VDC OFF LAMP (ON/OFF)

–

×

×

VDC OFF indicator lamp (ON/OFF) sta-
tus is displayed.

SLIP LAMP (ON/OFF)

–

–

×

SLIP indicator lamp (ON/OFF) status is 
displayed.

EV SIGNAL-FL (ON/OFF)

–

×

×

Front LH ABS inlet solenoid valve (ON/
OFF) status is displayed.

AV SIGNAL-FL (ON/OFF)

–

×

×

Front LH ABS outlet solenoid valve (ON/
OFF) status is displayed.

EV SIGNAL-RR (ON/OFF)

–

×

×

Rear RH ABS inlet solenoid valve (ON/
OFF) status is displayed.

AV SIGNAL-RR (ON/OFF)

–

×

×

Rear RH ABS outlet solenoid valve (ON/
OFF) status is displayed.

EV SIGNAL-FR (ON/OFF)

–

×

×

Front RH ABS inlet solenoid valve (ON/
OFF) status is displayed.

AV SIGNAL-FR (ON/OFF)

–

×

×

Front RH ABS outlet solenoid valve (ON/
OFF) status is displayed.

EV SIGNAL-RL (ON/OFF)

–

×

×

Rear LH ABS inlet solenoid valve (ON/
OFF) status is displayed.

AV SIGNAL-RL (ON/OFF)

–

×

×

Rear LH ABS outlet solenoid valve (ON/
OFF) status is displayed.

USV SIGNAL-P (ON/OFF)

–

×

×

Primary-side USV solenoid valve (ON/
OFF) status is displayed.

USV SIGNAL-S (ON/OFF)

–

×

×

Secondary-side USV solenoid valve 
(ON/OFF) status is displayed.

MAV SIGNAL-P (ON/OFF)

–

×

×

Primary-side MAV solenoid valve (ON/
OFF) status is displayed.

MAV SIGNAL-S (ON/OFF)

–

×

×

Secondary-side MAV solenoid valve 
(ON/OFF) status is displayed.

V/R SIGNAL (ON/OFF)

–

–

×

Solenoid valve relay operation signal 
(ON/OFF) status is displayed.

M/R OUTPUT (ON/OFF)

–

×

×

Front motor relay activation signal (ON/
OFF) status is displayed.

VDC FAIL SIG (ON/OFF)

–

–

×

VDC fail signal (ON/OFF) status is dis-
played.

TCS FAIL SIG (ON/OFF)

–

–

×

TCS fail signal (ON/OFF) status is dis-
played.

ABS FAIL SIG (ON/OFF)

–

–

×

ABS fail signal (ON/OFF) status is dis-
played.

EBD FAIL SIG (ON/OFF)

–

–

×

EBD fail signal (ON/OFF) status is dis-
played.

FLUID LEV SW (ON/OFF)

–

–

×

Brake fluid level warning lamp switch 
(ON/OFF) status is displayed.

EBD SIGNAL (ON/OFF)

–

–

×

EBD operation (ON/OFF) status is dis-
played.

Data monitor item (Unit)

SELECT MONITOR ITEM

Remarks

ECU INPUT

SIGNALS

MAIN SIGNALS

SELECTION 

FROM MENU