Normal operation

The ABS operates at speeds above 3 to 6 MPH (5 to 10 km/h). The speed varies according to road conditions.

When the ABS senses that one or more wheels are close to locking up, the actuator rapidly applies and releases hydraulic pressure. This action is similar to pumping the brakes very quickly. You may feel a pulsation in the brake pedal and hear a noise from under the hood or feel a vibration from the actuator when it is operating. This is normal and indicates that the ABS is operating properly. However, the pulsation may indicate that road conditions are hazardous and extra care is required while driving.

    See also:

    Anti-freeze
    In the winter when it is anticipated that the outside temperature will drop below 328F (08C), check the anti-freeze to assure proper winter protection. For additional information, see “Engine ...

    NISSAN vehicle immobilizer system
    The NISSAN Vehicle Immobilizer System will not allow the engine to start without the use of a registered key. If the engine fails to start using a registered key (for example, when interference ...

    Overview
    The Altima is a mid-size car currently being manufactured by the Japanese automaker Nissan, and is arguably a continuation of the "bloodline" that began with the Nissan Bluebird in 1957. ...