Circuit Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
During a general system malfunction, ATC control module senses rear wheel to front wheel slip (difference of rear wheel to front wheel speed). Control module attempts to correct difference by turning on shift motor (internal to transfer case) to apply torque to front wheels.