ABS

System Description

ABS SYSTEM
In case of electrical malfunctions with the ABS, ABS warning lamp will turn ON and the condition of the vehicle will be fail-safe which is the same condition of vehicles without ABS system.

NOTE:
ABS self-diagnosis sound may be heard. That is a normal condition because a self-diagnosis for "Ignition switch ON" and "The first starting" are being performed.

CAUTION:
If the Fail-Safe function is activated, then perform self-diagnosis for ABS control system.

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

• Ensures proper tracking performance through steering wheel operation.
• Enables obstacles to be avoided through steering wheel operation.
• Enables vehicle stability by preventing flat spins.

OPERATION

• When the vehicle speed is less than 10 km/h (6 MPH) this system does not work.
• The ABS has self-test capabilities. The system turns on the ABS warning lamp for 2 seconds after turning the ignition switch ON. The system performs another test the first time the vehicle reaches 6 km/h (4 MPH) . A mechanical noise may be heard as the ABS performs a 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 come on.
• During ABS operation, a mechanical noise may be heard. This is a normal condition.

FAIL SAFE
If trouble occurs in the ABS, the ABS warning lamp in the combination meter comes on. At the same time, the vehicle stops the ABS control and braking becomes the same as that of a vehicle without ABS.

ELECTRICAL COMPONENTS

• When starting engine or just after starting vehicle, brake pedal may vibrate or the motor operating sound may be heard from engine room. This is a normal states of the operation check.
• During ABS operation, brake pedal lightly vibrates and a mechanical sound may be heard. This is normal.
• Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or snow-covered (fresh, deep snow) roads.

CAN Communication
Refer to See: Powertrain Management\Computers and Control Systems\Information Bus\Description and Operation\CAN Communication System\System Description.