ABS/TCS - ABS Self-Check Noise Information

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Technical Service Bulletin # 10-077A Date: 110921

ABS/TCS - ABS Self-Check Noise Information

Classification: BR10-004A

Reference; NTB10-077A

Date: September 21, 2011

ABS SELF CHECK NOISE

This bulletin has been amended to include vehicles with 30 MPH Self-Check logic. Discard previous bulletin.

APPLIED VEHICLES: All Nissan Vehicles with ABS or ABS/VDC

SERVICE INFORMATION

If you identify:

^ Clicking, knocking, clunking, buzzing, or thumping noise coming from the engine compartment area.

And:

^ The noise occurs only once per ignition cycle (ignition OFF> ON) and does not occur again until the ignition is cycled.

And:

^ The noise happens briefly for only a few seconds on acceleration, between 5 and 30 MPH; depending on vehicle model and year.

The above condition is normal, may be louder if the vehicle has not been operated for a prolonged period of time, and does not need repair.

Each time the ignition is turned on and the vehicle reaches approximately 5 to 30 MPH, the ABS/VDC system performs a "Self-Check" to confirm

components of the ABS/VDC system are operating correctly.

This Self-Check function creates the noise described above.

If the brakes are being applied when the Self-Check occurs, a vibration may be felt in the brake pedal and an increased level of noise may be noticed.

NOTE:

^ See chart above for vehicles with 30 MPH Self-Check logic. Those not on charts will Self-Check at between approximately 5-20 MPH.

^ Some drive patterns may not reach Self-Test speed on first acceleration.

^ Refer customers to the Owners Manual, Section 5, Starting and driving, Brake system on the Anti-Lock Braking System (ABS). The "Self-Test"

feature section provides additional explanation.

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Page 221