Circuit Description
WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
PCM controlled cruise control system is designed to be self-monitored to ensure desired cruise servo position and actual cruise servo position are equal to one another. PCM will set Code P1558 when actual servo position is too low when maximum servo is commanded.