Cruise Control Vacuum Solenoid: Description and Operation

SPEED CONTROL SERVOS-PCM OUTPUT
The PCM controls operation of the vacuum and the operator presses the on switch, the PCM provides power through the brake switch to the servo. When the speed control system is engaged following a set or resume, the PCM supplies a ground to the vacuum and or vent solenoids inside the servo as needed to maintain the selected vehicle speed. Refer to the Speed Control for more information.