Speed Control Systems - Automatic: Description: Notes

This system uses manifold vacuum (except diesel) to power a throttle servo unit. Diesel equipped vehicles utilize a vacuum pump and regulator to supply required vacuum. When speed adjustment is necessary, servo moves the throttle by receiving varying amounts of controlled vacuum from a transducer assembly. The speedometer cable from the transmission drives the transducer, and a cable from the transducer drives the speedometer. The transducer is activated by a three position switch located at the end of the turn signal lever on the steering column. In addition, some models have an "ON-OFF" switch on the instrument panel to control the entire system.