Traction Control

The traction control system, consists of or uses the following components:

• Anti-lock brake control module.
• Powertrain control module (PCM) (12A650).
• Front wheel speed sensors.
• Rear wheel speed sensors.
• Traction control switch.

The traction control system:

• Is operational when the ignition switch is in the RUN position.
• Can be disabled by the driver pressing the traction control switch. The traction control system will reset when the ignition switch is cycled or when the traction control switch is pressed again.
• Is controlled by the anti-lock brake control module.
• Applies and releases the appropriate rear brake to reduce wheelspin and aid traction if one or both rear wheels lose traction and begin to spin during acceleration.
• Interacts with the powertrain control module to reduce engine torque if one or both rear wheels lose traction and begin to spin during acceleration.
• If a hydraulic brake system malfunction occurs, engine torque modulation is disabled.
• Automatically stops traction control system cycling if the brakes are manually applied during traction control system operation. Engine torque modulation remains enabled.
• The traction control system can be disabled either by the driver or by the anti-lock brake control module, traction control modulation is disabled.
• With the traction control system on, brake modulation to the spinning wheel is achieved by the anti-lock brake control module closing the isolation valves to the non-affected wheels and running the pump motor that provides hydraulic pressure for brake modulation to the spinning wheel.
• Engine torque modulation is achieved by the anti-lock brake control module interacting with the powertrain control module to regulate fuel, spark any cylinders.