Lights Okay But Rear Wheels Lock-Up
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1988 Ford Pickup, 1988 Ford Cab & Chassis, 1988 Ford Bronco II, 1988 Ford Bronco, and 1987 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Check vehicle stoplight operation. If stoplights do not operate, repair as necessary. If stoplights operate, check rear brakes. Repair or replace brake if necessary. If brakes are okay, replace computer module and retest system. If system is still not correct, check speed sensor. See CODE 6 under DIAGNOSTIC CODES in this article.