Cruise control unit compares the actual vehicle speed detected by feedback signals from the speed sensor incorporated in the speedometer with the speed set in the memory memorized when the set switch was turned ON. A signal is then transmitted according to the difference between the 2 speeds.
This signal is transmitted to the solenoid valves of the valve assembly located in the engine compartment. The movement of the actuator operates the throttle valve through the accelerator pedal and cable, thereby keeping the vehicle's speed constant.