Antilock Brakes / Traction Control Systems: Description and Operation

PURPOSE
The Anti-Lock Brake System (ABS) consists of electronic and hydraulic components. It allows for control of braking force so locking of the wheels can be avoided.

Improves Proper Tracking - performance through improved steering control during the braking operation.

Eases Obstacle Avoidance - through steering wheel operation.

Improves Vehicle Stability - by not allowing individual wheel lock-up.

OPERATION
^ When the vehicle speed is less than 10 km/h (6 MPH) this system does not work.
^ The ABS has a self-test function. The system turns on the ABS warning lamp for 1 second each time the ignition switch is turned "ON". After the engine is started, the ABS warning lamp turns "OFF". The system performs a test the first time the vehicle reaches 6 km/h (4 MPH). A mechanical noise may be heard as the ABS performs this self-test. This is a normal part of the self-test feature. If a malfunction is found during this check, the ABS warning lamp will stay "ON".
^ While driving, a mechanical noise may be heard during ABS operation. This is a normal condition.

CAUTION: When driving in 4WD, the rear wheel anti-lock brake system is not effective in most cases. The rear wheels will lock if the front wheels lock because the transfer case mechanically couples the front and rear axles together. If this happens, the rear anti-lock brake system may not function but the ordinary brakes will operate normally. The ABS warning lamp will then turn "ON." The above condition is not a malfunction and the rear wheel anti-lock brake system can be re-activated by starting the engine again. The ABS warning lamp will then go "OFF."