2009 Nissan Pathfinder Owner's Manual - Page 357

ACTIVE BRAKE LIMITED SLIP (ABLS) SYSTEM WARNING Do not pump the brake pedal. Doing so may result in increased stopping distances. pedal. This is normal and does not indicate a malfunction. If the computer senses a malfunction, it switches the ABS off and illuminates the ABS warning light on the instrument panel. The brake system then operates normally, but without anti-lock assistance. If the ABS warning light illuminates during the self-test or while driving, have the vehicle checked by a NISSAN dealer. ● ABLS is a form of traction control using sensors from the Anti-lock Brake System (ABS) to transfer power from a slipping drive wheel to a wheel with more traction. The ABLS system applies braking to the slipping wheel, which helps redirect power to another wheel. ● On 4WD models the ABLS system operates in both 4H and 4LO modes. If 4WD mode is engaged, the ABLS system will operate for both drive axles. On 2WD vehicles, the ABLS system operates on the drive axle only. ● The ABLS system is always ON unless the system detects brake pad overheating. If high brake pad temperature is detected, it will turn OFF, but normal brake function will continue. ABLS will function even when the VDC system is turned OFF. Normal operation The ABS operates at speeds above 3 - 6 MPH (5 - 10 km/h). When the ABS senses that one or more wheels are close to locking up, the system electronically controls the pressure applied to each brake. 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. WARNING The ABLS system provides increased traction, but will not prevent accidents due to abrupt steering operation or by careless driving or dangerous driving practices. Reduce vehicle speed and be especially careful when driving and cornering on slippery surfaces, and always drive carefully. Self-test feature The ABS includes electronic sensors, electric pumps, hydraulic solenoids and a computer. The computer has a built-in diagnostic feature that tests the system each time you start the engine and move the vehicle at a low speed in forward or reverse. When the self-test occurs, you may hear a "clunk" noise and/or feel a pulsation in the brake Starting and driving 5-35