Infiniti M35/M45 Y50. Manual - part 333

TROUBLE DIAGNOSIS

BRC-33

[VDC/TCS/ABS]

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BRC

Basic Inspection

NFS000QK

BASIC INSPECTION 1: BRAKE FLUID LEVEL, LEAK INSPECTION AND BRAKE PAD 

1.

Check fluid level in brake reservoir tank. If fluid level is low, refill brake fluid. Refer to 

BR-9, "CHECKING

BRAKE FLUID LEVEL"

 .

2.

Check for leakage in brake tubes or hoses and around ABS actuator and electric unit (control unit). If
there is leaking or seeping fluid, check the following items.

●

If the brake tube connections at ABS actuator and electric unit (control unit) are loose, tighten flare nuts
to the specified torque. Then inspect again and confirm that there is no leakage.

●

If flare nuts or screws of ABS actuator and electric unit (control unit) are damaged and loose, replace
damaged parts. Then inspect again and confirm that there is no leakage.

●

If there is leakage at any location other than ABS actuator and electric unit (control unit) connections,
wipe away leakage with clean cloth. Then inspect again and confirm that there is no leakage.

●

If there is leakage from ABS actuator and electric unit (control unit), wipe away leakage with clean cloth.
Then inspect again. If there is still leakage, replace ABS actuator and electric unit (control unit).

CAUTION:

ABS actuator and electric unit (control unit) cannot be disassembled.

3.

Check brake disc rotor and pads.

●

Front disc rotor: Refer to 

BR-27, "DISC ROTOR INSPECTION"

 .

●

Front brake pad: Refer to 

BR-22, "PAD WEAR INSPECTION"

 .

●

Rear disc rotor: Refer to 

BR-33, "DISC ROTOR INSPECTION"

 .

●

Rear brake pad: Refer to 

BR-28, "PAD WEAR INSPECTION"

 .

BASIC INSPECTION 2: LOOSENESS OF POWER SYSTEM TERMINALS AND BATTERY

Check battery for looseness on battery positive/negative terminals and ground connection. Also make sure
battery voltage does not drop and alternator is normal.

BASIC INSPECTION 3: ABS WARNING LAMP, BRAKE WARNING LAMP, VDC OFF INDICATOR 
LAMP AND SLIP INDICATOR LAMP
ON and OFF Timing for Warning Lamp and Indicator Lamp 

×

: ON

–: OFF

Note1: 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).
Note2: After starting engine, brake warning lamp is turned off.

Check the following items when unsuitable for an above condition.

●

ABS warning lamp: 

BRC-48, "CAN Communication Circuit"

 .

●

Brake warning lamp: 

BRC-48, "CAN Communication Circuit"

 , 

BRC-46, "Brake Fluid Level Switch Circuit"

, 

BRC-50, "Parking Brake Switch Circuit"

 .

●

VDC OFF indicator lamp: 

BRC-48, "CAN Communication Circuit"

 , 

BRC-49, "VDC OFF Switch Circuit"

 .

●

SLIP indicator lamp: 

BRC-48, "CAN Communication Circuit"

 .

If malfunction is not found, refer to 

BRC-50, "Warning Lamp and Indicator Lamp Circuit"

 .

Condition

ABS warning lamp

VDC OFF

 indicator lamp

SLIP indicator lamp

Brake warning lamp 

(Note1)

Ignition switch OFF

–

–

–

–

For 1 second after turning ON ignition 
switch

×

×

×

×

(Note 2)

1 second later after turning ON ignition 
switch

–

–

–

×

(Note 2)

VDC OFF switch turned ON.
(VDC function is OFF.)

–

×

–

–

VDC/TCS function is malfunctioning.

–

×

×

–

ABS function is malfunctioning.

×

×

×

–

EBD function is malfunctioning.

×

×

×

×

BRC-34

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

TROUBLE DIAGNOSIS FOR SYSTEM

PFP:00000

Wheel Sensor Circuit

NFS000QL

CAUTION:

Do not check between wheel sensor terminals.

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> INSPECTION END

2. 

CHECK TIRE

Check air pressure, wear and size.

Are air pressure, wear and size within standard?

YES

>> GO TO 3.

NO

>>

●

Adjust air pressure, or replace tire. 

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

3. 

CHECK SENSOR AND SENSOR ROTOR

●

Check sensor rotor for damage. 

●

Check wheel sensor for damage, disconnection or looseness.

OK or NG

OK

>> GO TO 4.

NG

>>

●

Repair wheel sensor mount or replace sensor rotor. Then perform the self-diagnosis.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

4. 

CHECK CONNECTOR

1.

Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E30 and
malfunctioning wheel sensor connector E41(FR-RH), E59(FR-LH), B466(RR-RH), B467(RR-LH). Check
terminal to see if it is deformed, disconnected, loose, etc., Repair or replace it if any malfunction condition
is found.

2.

Reconnect connectors and then perform the self-diagnosis. Refer to 

BRC-24, "Self-Diagnosis"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

Self-diagnosis results

FR RH SENSOR-1, -2

FR LH SENSOR-1, -2

RR RH SENSOR-1, -2

RR LH SENSOR-1, -2

ABS SENSOR [ABNORMAL SIGNAL]

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-35

[VDC/TCS/ABS]

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BRC

5. 

CHECK WHEEL SENSOR HARNESS

1.

Turn ignition switch OFF and disconnect malfunctioning wheel
sensor connector E41(FR-RH), E59(FR-LH), B466(RR-RH),
B467(RR-LH) and ABS actuator and electric unit (control unit)
connector E30.

2.

Check continuity between terminals. (Also check continuity
when steering wheel is turned right and left and when sensor
harness inside the wheel house is moved.)

OK or NG

OK

>> GO TO 6.

NG

>>

●

Repair or replace malfunctioning components.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

6. 

CHECK WHEEL SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect malfunctioning wheel sensor connector.

2.

Turn ignition switch ON and check voltage between wheel sen-
sor harness connector power supply terminal and ground.

OK or NG

OK

>> Replace wheel sensor.

NG

>> Replace ABS actuator and electric unit (control unit).

SFIA3030E

Power supply circuit

Signal circuit

Ground circuit

Wheel

ABS actuator 

and electric unit 

(control unit)

Wheel sensor

ABS actuator 

and electric unit 

(control unit)

Wheel sensor

ABS actuator 

and electric unit 

(control unit)

(signal)

Ground

Front RH 

9

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10

2

9, 10

—

Front LH

26

1

5

2

26, 5

Rear RH 

7

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29

2

7, 29

Rear LH 

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1

27

2

6, 27

Power supply circuit

: Continuity should exist.

Signal circuit

: Continuity should exist.

Ground circuit

: Continuity should not exist.

Wheel

Wheel sensor

Ground

Voltage

Front RH

1

—

8  V  or  more

Front LH

Rear RH

Rear LH

SFIA3341E

BRC-36

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

Engine System

NFS000QM

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

Check self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> INSPECTION END

2. 

CHECK ENGINE SYSTEM

1.

Perform ECM self-diagnosis. Repair or replace items indicated, then perform ECM self-diagnosis again.
Refer to 

EC-90, "TROUBLE DIAGNOSIS"

 (VQ35DE), 

EC-792, "TROUBLE DIAGNOSIS"

 (VK45DE).

2.

Perform ABS actuator and electric unit (control unit) self-diagnosis.

OK or NG

OK

>> INSPECTION END

NG

>>

●

Repair or replace malfunctioning components.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

ABS Actuator and Electric Unit (Control Unit)

NFS000QN

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

Check self-diagnosis results.

CAUTION:

Replace ABS actuator and electric unit (control unit) when self-diagnostic result shows items other
than those above.
Is above displayed on the self-diagnosis display?

YES

>>

●

Replace ABS actuator and electric unit (control unit).

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

NO

>> INSPECTION END

Self-diagnosis results

ENGINE SIGNAL 1

ENGINE SIGNAL 2

ENGINE SIGNAL 3

ENGINE SIGNAL 4

ENGINE SIGNAL 6

Self-diagnosis results

CONTROLLER FAILURE

EMERGENCY BRAKE

VARIANT CODING