System Description

Fig. 1 Speed control components:

The Integrated Vehicle Speed Control (IVSC) system, Fig. 1, consists of operator controls, a servo (throttle actuator) assembly, a speed sensor, a clutch switch, a stop lamp switch, a vacuum dump valve, a horn relay and necessary wires and vacuum hoses. The speed control amplifier assembly function is integrated into the EEC-IV Electronic Control Assembly (ECA). The servo assembly is mounted in the engine compartment and is connected to the throttle linkage with an actuator cable. The speed control sensor is located on the transaxle.

Fig. 10 Vacuum Dump Valve:

VACUUM DUMP VALVE
The vacuum dump valve, Fig. 2, provides a safety feature in the system. Normally, when the brake pedal is depressed, an electrical signal from the stop lamps to the ECA will turn off the system. In addition, the vacuum dump valve will mechanically release the vacuum in the servo when the brake pedal is depressed. This releases the throttle independently of the ECA control.