Circuit Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Important: Information contained in this diagnostic procedure is intended for use when servicing vehicles equipped with RPO JL4. Do not use this information to address concerns on vehicles equipped with NW7.
Proper operation of the traction control system (TCS) is highly dependent on the ability to apply brake pressure to a selected wheel, through the brake pressure modulator valve (BPMV), as commanded by the electronic brake control module (EBCM). The EBCM may not be able to detect certain mechanical failures that may cause the TCS to perform poorly. This diagnostic procedure is designed to help diagnose concerns of excessive wheel slip or dragging brakes during acceleration, which may occur without the presence of any DTCs.