Infiniti M45 (Y34). Manual - part 271

TROUBLE DIAGNOSIS

BRC-27

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

5.

Touch “VDC” in the “SELF DIAG MODE” screen.
If “VDC” is not indicated, go to 

GI-38, "CONSULT-II Data Link

Connector (DLC) Circuit"

 .

6.

Select the required diagnostic location from the “SELF DIAG
MODE” screen.
For further information, see the CONSULT-II Operation Manual.

SELF-DIAGNOSIS
Description

If a malfunction is detected in system, ABS warning lamp, VDC OFF lamp, and SLIP lamp on meter turn on.
In this case, perform self-diagnosis as follows:

Operation Procedure

1.

Turn ignition switch OFF.

2.

Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector.

3.

Turn ignition switch ON.

4.

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

5.

After stopping the vehicle, with the engine running, touch “START (NISSAN BASED VHCL)”, “VDC”,
“SELF-DIAG RESULTS” in order on the CONSULT-II screen.

CAUTION:

If “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or turning on
the ignition switch, “VDC” might not be displayed in the System Selection screen. In this case,
repeat the operation from step 1.

6.

The self-diagnostic results are displayed. (If necessary, the self-diagnostic results can be printed out by
touching “PRINT”.)

●

When “NO FAILURE” is displayed, check the ABS warning lamp, VDC OFF lamp, and SLIP lamp.

7.

Conduct the appropriate inspection from the display item list, and repair or replace the malfunctioning
component.

8.

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

CAUTION:

●

When a wheel sensor “short-circuit” is detected, if the vehicle is not driven at 30 km/h (19 MPH)
or more for at least 1 minute, the ABS warning lamp will not turn off even if everything is normal.

9.

Turn ignition switch OFF to prepare for erasing the memory.

10. Start the engine and touch “START (NISSAN BASED VHCL)”, “VDC”, “SELF-DIAG RESULTS”, “ERASE

MEMORY” in order on the CONSULT-II screen to erase the error memory.
If “VDC” is not indicated, go to 

GI-38, "CONSULT-II Data Link Connector (DLC) Circuit"

 .

CAUTION:

If the error memory is not erased, re-conduct the operation from step 5.

11. For the final inspection, drive at 30 km/h (19 MPH) or more for approximately 1 minute and confirm that

the ABS warning lamp, VDC OFF lamp, and SLIP lamp are off.

SFIA1924E

SFIA2436E

BRC-28

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Display Item List

Malfunction system

Malfunction detecting condition

Check system

FR LH SENSOR- 1

Circuit of front LH wheel sensor is open

BRC-38, "Inspection 1 
Wheel Sensor System"

 

(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

Circuit of front LH wheel sensor is shorted, or sensor power volt-
age is unusual. Control unit cannot identify sensor pulses, 
because of large gap between wheel sensor and sensor rotor.

RR RH SENSOR- 2

Circuit of rear RH wheel sensor is shorted, or sensor power volt-
age is unusual. Control unit cannot identify sensor pulses, 
because of large gap between wheel sensor and sensor rotor.

FR RH SENSOR- 2

Circuit of front RH wheel sensor is shorted, or sensor power volt-
age is unusual. Control unit cannot identify sensor pulses, 
because of large gap between wheel sensor and sensor rotor.

RR LH SENSOR- 2

Circuit of rear LH wheel sensor is shorted, or sensor power volt-
age is unusual. Control unit cannot identify sensor pulses, 
because of large gap between wheel sensor and sensor rotor.

MAIN RELAY

During solenoid valve relay operation with OFF, when solenoid 
valve relay turns ON or when control line for relay is shorted to 
ground.

BRC-50, "Inspection 9 
Solenoid Valve Relay 
System"

During solenoid valve relay operation with ON, when solenoid 
valve relay turns OFF or when control line for relay is open.

STOP LAMP SW

Stop lamp switch circuit is open.

BRC-51, "Inspection 10 
Stop Lamp Switch Sys-
tem"

PRESS SEN CIRCUIT

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

BRC-40, "Inspection 4 
Pressure Sensor Sys-
tem"

ST ANGLE SEN CIRCUIT

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

BRC-42, "Inspection 5 
Steering Angle Sensor 
System"

YAW RATE SENSOR

Yaw rate sensor has generated an error, or yaw rate sensor sig-
nal line is open or shorted.

BRC-43, "Inspection 6 
Yaw Rate/Side G Sensor 
System"

FR LH IN ABS SOL

Circuit of front LH IN ABS solenoid is open or shorted, or control 
line is open or shorted to power supply or ground.

BRC-45, "Inspection 7 
Solenoid and VDC 
Change-Over Valve Sys-
tem"

FR LH OUT ABS SOL

Circuit of front LH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.

RR RH IN ABS SOL

Circuit of rear RH IN ABS solenoid is open or shorted, or control 
line is open or shorted to power supply or ground.

RR RH OUT ABS SOL

Circuit of rear RH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.

FR RH IN ABS SOL

Circuit of front RH IN ABS solenoid is open or shorted, or control 
line is open or shorted to power supply or ground.

FR RH OUT ABS SOL

Circuit of front RH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.

RR LH IN ABS SOL

Circuit of rear LH IN ABS solenoid is open or shorted, or control 
line is open or shorted to power supply or ground.

RR LH OUT ABS SOL

Circuit of rear LH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.

TROUBLE DIAGNOSIS

BRC-29

[VDC/TCS/ABS]

C

D

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A

B

BRC

Note 1: After completing repairs of the shorted sensor circuit, when ignition switch is turned ON, ABS warning
lamp turns on. Check that ABS warning lamp turns off while driving the vehicle at 30 km/h (19 MPH) or more
for approximately 1 minute according to self-diagnosis procedure. In addition, if wheel sensor 2 is displayed
for the wheels, check the wheel sensor circuit and also check the control unit power voltage.
Note 2: When errors are detected in several systems, including the CAN communication system [U1000], trou-
bleshoot the CAN communication system.

PRIMARY SIDE USV CIRCUIT

Circuit of primary-side VDC switch-over valve 1 is open or 
shorted, or control line is open or shorted to power supply or 
ground.

BRC-45, "Inspection 7 
Solenoid and VDC 
Change-Over Valve Sys-
tem"

SECONDARY SIDE USV CIR-
CUIT

Circuit of secondary-side VDC switch-over valve 1 is open or 
shorted, or control line is open or shorted to power supply or 
ground.

PRIMARY SIDE HSV CIRCUIT

Circuit of primary-side VDC switch-over valve 2 is open or 
shorted, or control line is open or shorted to power supply or 
ground.

SECONDARY SIDE HSV CIR-
CUIT

Circuit of secondary-side VDC switch-over valve 2 is open or 
shorted, or control line is open or shorted to power supply or 
ground.

PUMP MOTOR ACTUATOR RLY 

During actuator motor operation with ON, when actuator motor 
turns OFF or when control line for actuator motor relay is open.

BRC-48, "Inspection 8 
ABS Motor and Motor 
Relay System"

During actuator motor operation with OFF, when actuator motor 
turns ON or when control line for relay is shorted to ground.

LOW POWER VOLTAGE

VDC/TCS/ABS control unit power voltage is too low.

BRC-52, "Inspection 11 
VDC/TCS/ABS Control 
Unit Power and Ground 
Systems"

ST ANGLE SEN SIGNAL

Neutral position correction of steering angle sensor is not fin-
ished.

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

ST ANG SEN COM CIR

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

BRC-42, "Inspection 5 
Steering Angle Sensor 
System"

 

SIDE G-SEN CIRCUIT

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

BRC-43, "Inspection 6 
Yaw Rate/Side G Sensor 
System"

EMERGENCY BRAKE

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

BRC-54, "Inspection 12 
VDC/TCS/ABS Control 
Unit 2"

ABS CONTROLLER 

Internal malfunction of VDC/TCS/ABS control unit

BRC-40, "Inspection 3 
VDC/TCS/ABS Control 
Unit 1"

SHIFT POSITION ERROR

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

BRC-55, "Inspection 15 
When “SHIFT POSI-
TION ERROR” Appears 
in Self-Diagnosis Results 
Display"

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-55, "Inspection 14 
CAN Communication 
System"

(Note 2)

BR FLUID LEVEL LOW

●

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

BRC-54, "Inspection 13 
Brake Fluid Level Sensor 
System"

ENGINE SIGNAL 1-4,6

●

Major engine component is malfunctioning.

BRC-40, "Inspection 2 
Engine System"

Malfunction system

Malfunction detecting condition

Check system

BRC-30

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

DATA MONITOR

●

For details of data monitor function, refer to “CONSULT-II Instruction Manual”.

Operation Procedure

1.

Turn ignition switch OFF.

2.

Connect CONSULT-II and CONSULT-II CONVERTER to data link connector.

3.

Turn ignition switch ON.

4.

Touch “START” on display.

5.

Touch “VDC” on display.
NOTE:
Just after starting engine, or turning ignition switch ON, “VDC” may not be displayed on system selection
screen even if “START” is touched. In this case, start self-diagnosis again from step 2. 

6.

Touch “DATA MONITOR”.

7.

Return to monitor item selection screen, and touch any of “ECU INPUT ITEM”, “MAIN SIGNALS” or
“SELECTION FROM MENU”. 

8.

Touch “START”.

9.

Screen of data monitor is displayed.

Display Item List

Item (Unit)

Monitor item selection

Remarks

ECU INPUT 

SIGNALS

MAIN SIGNALS

 SELECTION 

FROM MENU

GEAR POSITION

×

×

×

Gear position judged by PNP 
switch signal is displayed.

VHCL SPEED FR (km/h)

×

×

×

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

VHCL SPEED FL (km/h)

×

×

×

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

VHCL SPEED RR (km/h)

×

×

×

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

VHCL SPEED RL (km/h)

×

×

×

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

ABS CONT VOLT (V)

×

×

×

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

THRTL OPENING (%)

×

×

×

Throttle valve opening/closing sta-
tus judged by CAN communication 
signal is displayed.

ENGINE RPM (rpm)

×

×

×

Engine speed judged by CAN 
communication signal is displayed.

STR ANGLE SIG (

°

)

×

–

×

Steering angle detected by steer-
ing angle sensor is displayed.

YAW RATE SEN (d/s)

×

–

×

Yaw rate detected by yaw rate 
sensor is displayed.

SIDE G-SEN (m/s

2

 )

×

–

×

Side G acceleration detected by 
side G-sensor is displayed.

PRESS SENSOR (bar )

×

–

×

Brake fluid pressure detected by 
pressure sensor is displayed.

STOP LAMP SW (ON/OFF)

×

×

×

Stop lamp switch (ON/OFF) status 
is displayed.

PARK BRAKE SW (ON/OFF)

×

–

×

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