Automatic Stability Control (ASC)

The ASC system uses ABS components to sense vehicle traction. The ASC system is controlled by a switch on center console. ASC system can be switched off. When system is switched off, a warning light is illuminated to inform driver that system is disabled. If ASC system is switched off, system will automatically be switched on at next ignition on cycle. If ASC system detects a slipping wheel, an Amber warning light will flash on instrument panel.

The ASC system reduces engine torque to control vehicle traction. Engine torque is reduced by:

• Moving throttle towards closed position.
• Retarding ignition timing.
• Shutting off fuel at fuel injectors.

Wheel spin is detected using wheel speed sensors. This information is transmitted to Anti-Lock Brake System/Traction Control Control Module (ABS/TCCM). The ABS/TCCM will use information from the Controller Area Network (CAN) to calculate torque that the engine should produce to stop wheels from spinning. Torque reduction is requested by the Engine Control Module (ECM) through the CAN. Throttle angle is reduced to produce the desired torque. During the transient phase of torque reduction fuel is cut-off and ignition is retarded. After throttle reaches it's new position, fuel and ignition are restored to normal operational settings.