Description

PURPOSE
The 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.
- Ensures vehicle stability by preventing flat spins.

ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION
- When the vehicle speed is less than 10 km/h (6 MPH) this system does not work.
- The Anti-Lock Brake System (ABS) has self-test capabilities. The system turns on the ABS warning lamp for 1 second 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.

TCS (TRACTION CONTROL SYSTEM) OPERATION
- This system is designed to limit wheel slip during acceleration by cutting fuel to selected engine cylinders and changing the transmission shift schedule.
The ABS actuator and electric unit (control unit) monitors wheel speed slips through the ABS wheel speed sensors and determines the desired torque reduction needed to minimize wheel spin.
The torque reduction by the ABS actuator and electric unit (control unit) may result in a combination of fuel cutoff and transmission shift timing adjustments.
The torque reduction is sent from the ABS actuator and electric unit (control unit) through the Controller Area Network (CAN) to the ECM and the TCM. The ECM will cut fuel and/or the TCM will change transmission shift schedule to achieve torque reduction.
The TCS will be enabled when the TCS switch is in the ON position (TCS OFF indicator not illuminated), and if the catalytic converter temperature is within the normal operating range.
- During TCS operation, the system informs the driver of system operation by flashing the SLIP indicator lamp.
- This system has a self-diagnostic function. When the ignition switch is initially turned ON, the SLIP indicator lamp and TCS OFF indicator lamp will illuminate. If the ABS/TCS system is operating correctly, both indicator lamps will go out as soon as the engine starts.
- The TCS OFF switch cancels the TCS function. The TCS OFF indicator lamp then illuminates to indicate that the TCS system is not operating.
- This system utilizes a fuel-cut function to control drive torque. If fuel cut continues for an extended period of time during high-speed operation, the catalyst may melt and deteriorate. During continued TCS operation, the system will sometimes suspend the drive torque control function, preventing catalyst damage.

Fail Safe
If trouble occurs in the ABS, the ABS warning lamp in the 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.