Infiniti G37 Coupe. Manual - part 279

BRC-90

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

EXCESSIVE ABS FUNCTION OPERATION FREQUENCY

SYMPTOM DIAGNOSIS

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. Refer to 

BR-63, "General Specifications"

.

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.
• Front: Refer to 

FAX-4, "Inspection"

. 

• Rear: Refer to 

RAX-5, "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.

• 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-26, "CONSULT-III Function"

.

NO

>> Normal

UNEXPECTED PEDAL REACTION

BRC-91

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

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BRC

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UNEXPECTED PEDAL REACTION

Diagnosis Procedure

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1.

CHECK BRAKE PEDAL STROKE

Check brake pedal stroke. Refer to 

BR-7, "Inspection and Adjustment"

.

Is the stroke too large?

YES

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

BR-12, "Bleeding Brake System"

.

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

fluid leakage, etc.

- Brake pedal: Refer to 

BR-7, "Inspection and Adjustment"

.

- Brake master cylinder: Refer to 

BR-13, "Inspection"

.

- Brake booster: Refer to 

BR-14, "Inspection"

.

- Brake fluid: Refer to 

BR-11, "Inspection"

.

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

>> Normal

NO

>> Check brake system.

BRC-92

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

THE BRAKING DISTANCE IS LONG

THE BRAKING DISTANCE IS LONG

Diagnosis Procedure

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CAUTION:

The stopping distance on slippery road surfaces might be longer when the ABS is 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

>> Normal

NO

>> Check brake system.

ABS FUNCTION DOES NOT OPERATE

BRC-93

< SYMPTOM DIAGNOSIS >

[VDC/TCS/ABS]

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ABS FUNCTION DOES NOT OPERATE

Diagnosis Procedure

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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.

Is the inspection result normal?

YES

>> Normal

NO

>> Perform self-diagnosis.