Cruise Control
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
On models with cruise control, the system is operated by the PCM. PCM receives inputs from VSS, servo diaphragm position sensor, cruise control switch and brake release switch. Based on these inputs, PCM controls vacuum valves at servo. PCM prevents system engagement at speeds of less than 25 MPH. PCM is not serviceable; if defective, it must be replaced. System faults are stored as codes in PCM memory.