Nissan Titan. Manual - part 40

VDC/TCS/ABS

BRC-101

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

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SYMPTOM DIAGNOSIS

VDC/TCS/ABS

Symptom Table

INFOID:0000000009883730

If ABS warning lamp and SLIP indicator lamp turn ON, perform self-diagnosis.

NOTE:
• 1: The ABS does not operate when the speed is 10 km/h (6 MPH) or less.
• 2: Under the following conditions, ABS is activated and vibration is felt when brake pedal is lightly depressed. 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]

Symptom

Check item

Reference

Excessive ABS function operation fre-
quency

Brake force distribution

BRC-102, "Diag-

nosis Procedure"

Looseness of front and rear axle

Wheel sensor and rotor system

Unexpected pedal reaction

Brake pedal stroke

BRC-103, "Diag-

nosis Procedure"

Make sure the braking force is sufficient when the ABS is not operating.

The braking distance is long

Check stopping distance when the ABS is not operating.

BRC-104, "Diag-

nosis Procedure"

ABS function does not operate (Note 1)

ABS actuator and electric unit (control unit)

BRC-105, "Diag-

nosis Procedure"

Pedal vibration or ABS operation sound 
occurs (Note 2)

Brake pedal

BRC-106, "Diag-

nosis Procedure"

ABS actuator and electric unit (control unit)

Vehicle jerks during VDC/TCS/ABS con-
trol

ABS actuator and electric unit (control unit)

BRC-107, "Diag-

nosis Procedure"

TCM

ECM

BRC-102

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

EXCESSIVE ABS FUNCTION OPERATION FREQUENCY

EXCESSIVE ABS FUNCTION OPERATION FREQUENCY

Diagnosis Procedure

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1.

CHECK START

Check front and rear brake force distribution using a brake tester.
Is the inspection result normal?

YES

>> GO TO 2

NO

>> 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, "On-Vehicle

Inspection and Service"

, Rear: 

RAX-5, "On-Vehicle Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> 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.
Is the inspection result normal?

YES

>> GO TO 4

NO

>> • Replace wheel sensor or sensor rotor. Refer to 

BRC-113, "Removal and Installation"

 or 

BRC-

115, "Removal and Installation"

.

• 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. 
Is the ABS warning lamp illuminated?

YES

>> Perform self-diagnosis. Refer to 

BRC-24, "CONSULT Function (ABS)"

.

NO

>> Inspection End.

UNEXPECTED PEDAL REACTION

BRC-103

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

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UNEXPECTED PEDAL REACTION

Diagnosis Procedure

INFOID:0000000009883732

1.

CHECK BRAKE PEDAL STROKE

Check brake pedal stroke. Refer to 

BR-13, "Inspection and Adjustment - Standard Pedal"

 or 

BR-14, "Inspec-

tion and Adjustment - Adjustable Pedal"

.

Is the stroke too large?

YES

>> • Bleed air from brake tube and hose. Refer to 

BR-16, "Bleeding Brake System"

.

• Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake system

fluid leakage, etc. Refer to 

BR-13, "Inspection and Adjustment - Standard Pedal"

 or 

BR-14,

"Inspection and Adjustment - Adjustable Pedal"

 (brake pedal), 

BR-25, "Removal and Installa-

tion"

 (master cylinder), 

BR-8, "Inspection"

 (brake booster).

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.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Check brake system.

BRC-104

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

THE BRAKING DISTANCE IS LONG

THE BRAKING DISTANCE IS LONG

Diagnosis Procedure

INFOID:0000000009883733

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.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Check brake system.