Infiniti M35/M45 Y50. Manual - part 337

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-49

[VDC/TCS/ABS]

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BRC

VDC OFF Switch Circuit

NFS000R1

INSPECTION PROCEDURE

1. 

CHECK VDC OFF SWITCH

1.

Turn ignition switch OFF and disconnect VDC OFF switch con-
nector M24.

2.

Check continuity between VDC OFF switch connector M24 ter-
minal 1 and 2.

OK or NG

OK

>> GO TO 2.

NG

>> VDC OFF switch is malfunctioning. Replace VDC OFF

switch.

2. 

CHECK VDC OFF SWITCH HARNESS

1.

Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.

2.

Check continuity between VDC OFF switch connector M24 and
ABS actuator and electric unit (control unit) connector E30.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace malfunctioning components.

VDC OFF switch

Condition

Continuity

1, 2

VDC OFF switch ON

Yes

VDC OFF switch OFF

No

SFIA2409E

ABS actuator and electric unit (control unit)

VDC OFF switch

Continuity

31

1

Yes

Ground

No

Ground

2

Yes

SFIA3047E

BRC-50

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

Parking Brake Switch Circuit

NFS000R2

INSPECTION PROCEDURE

1. 

CHECK PARKING BRAKE SWITCH

1.

Turn ignition switch OFF and disconnect parking brake switch
connector E110.

2.

Check continuity between parking brake switch connector E110
and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Parking brake switch is malfunctioning. Replace parking

brake switch.

2. 

CHECK PARKING BRAKE SWITCH HARNESS

1.

Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.

2.

Check continuity between parking brake switch connector E110
and ABS actuator and electric unit (control unit) connector E30.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace malfunctioning components.

Warning Lamp and Indicator Lamp Circuit

NFS000R3

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

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

OK or NG

OK

>> GO TO 2.

NG

>> Check items displayed by self-diagnosis. Refer to 

BRC-24, "Self-Diagnosis"

 .

2. 

CHECK COMBINATION METER

Check the indication and operation of combination meter are normal. Refer to 

DI-17, "Self-Diagnosis Mode of

Combination Meter"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Combination meter is malfunctioning. Repair or replace combination meter. Refer to 

DI-5, "COM-

BINATION METERS"

 .

Condition

Continuity

When the parking brake pedal is operated

Yes

When the parking brake pedal is not operated

No

SFIA2935E

ABS actuator and electric unit (control unit)

Parking brake switch

Continuity

36

1

Yes

Ground

No

SFIA3048E

TROUBLE DIAGNOSIS FOR SYMPTOMS

BRC-51

[VDC/TCS/ABS]

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BRC

TROUBLE DIAGNOSIS FOR SYMPTOMS

PFP:00007

Excessive ABS Function Operation Frequency

NFS000R4

1. 

CHECK START

Check front and rear brake force distribution using a brake tester. Refer to 

BR-34, "SERVICE DATA AND

SPECIFICATIONS (SDS)"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Check brake system.

2. 

CHECK FRONT AND REAR AXLE

Make sure that there is no excessive play in the front and rear axles. Refer to front: 

FAX-5, "WHEEL BEAR-

ING INSPECTION"

 , Rear: 

RAX-5, "WHEEL BEARING INSPECTION"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace malfunctioning components.

3. 

CHECK WHEEL SENSOR AND SENSOR ROTOR

Check the following.

●

Wheel sensor installation for damage.

●

Sensor rotor installation for damage. 

●

Wheel sensor connector connection.

●

Wheel sensor harness inspection.

OK or NG

OK

>> GO TO 4.

NG

>>

●

Replace wheel sensor or sensor rotor.

●

Repair harness.

4. 

CHECK ABS WARNING LAMP DISPLAY

Make sure that the ABS warning lamp is turned off after the ignition switch is turned ON or when driving. 

OK or NG

OK

>> Normal

NG

>> Perform self-diagnosis. Refer to 

BRC-24, "Self-Diagnosis"

 .

Unexpected Pedal Reaction

NFS000R5

1. 

CHECK BRAKE PEDAL STROKE

Check brake pedal stroke. Refer to 

BR-6, "Inspection and Adjustment"

 .

Is the stroke too big?

YES

>>

●

Bleed air from brake tube and hose. Refer to 

BR-10, "Bleeding Brake System"

 .

●

Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake sys-
tem fluid leakage, etc. Refer to brake pedal: 

BR-7, "COMPONENTS"

 , brake booster and mas-

ter cylinder: 

BR-18, "COMPONENTS"

 .

NO

>> GO TO 2.

2. 

CHECK FUNCTION

Disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS. Check if braking force is
normal in this condition. Connect connector after inspection.

OK or NG

OK

>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to 

BRC-51,

"Excessive ABS Function Operation Frequency"

 .

NG

>> Check brake system.

BRC-52

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYMPTOMS

The Braking Distance Is Long

NFS000R6

CAUTION:

The stopping distance on slippery road surfaces might be longer with the ABS operating than when
the ABS is not operating.

1. 

CHECK FUNCTION

Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector to deactivate
ABS. In this condition, check stopping distance. After inspection, connect connector.

OK or NG

OK

>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to 

BRC-51,

"Excessive ABS Function Operation Frequency"

 .

NG

>> Check brake system.

ABS Function Does Not Operate

NFS000R7

CAUTION:

ABS does not operate when speed is 10 km/h (6 MPH) or lower.

1. 

CHECK ABS WARNING LAMP DISPLAY

Make sure that the ABS warning lamp turns OFF after ignition switch is turned on or when driving.

OK or NG

OK

>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to 

BRC-51,

"Excessive ABS Function Operation Frequency"

 .

NG

>> Perform self-diagnosis. Refer to 

BRC-24, "Self-Diagnosis"

 . 

Pedal Vibration or ABS Operation Sound Occurs

NFS000R8

CAUTION:

Under the following conditions, ABS is activated and vibration is felt when brake pedal is lightly
depressed (just place a foot on it). However, this is normal.

●

When shifting gears

●

When driving on slippery road

●

During cornering at high speed

●

When passing over bumps or grooves [at approximately 50 mm (1.97 in) or more]

●

When pulling away just after starting engine [at approximately 10 km/h (6 MPH) or higher]

1. 

SYMPTOM CHECK 1

Check if there is pedal vibration or operation sound when the engine is started.

Do symptoms occur?

YES

>> GO TO 2.

NO

>> Perform self -diagnosis. Refer to 

BRC-24, "Self-Diagnosis"

 .

2. 

SYMPTOM CHECK 2

Check symptoms when electrical component (headlamps, etc.) switches are operated.

Do symptoms occur?

YES

>> Check if there is a radio, antenna, antenna lead wire, or wiring close to the control unit. If there is,

move it farther away.

NO

>> GO TO procedure 3 “CHECK WHEEL SENSOR AND SENSOR ROTOR”. Refer to 

BRC-51,

"Excessive ABS Function Operation Frequency"

 .