Cruise Control Module: Description and Operation

Amplifier

The Speed Control Amplifier controls vacuum to the Speed Control Servo Motor through the Modulating Valve. The Servo Motor moves the throttle through the Actuator cable.

To operate the Speed Control System, the engine must be running and vehicle speed must be greater than 30 mph. The system is turned on by pressing the ON switch of the Speed Control Switch Assembly.

SET/ACCEL or COAST

Pressing and releasing SET/ACCEL or COAST sends a command to hold the car's present speed. This speed becomes the set speed. The Vehicle Speed Sensor (at the transaxle) sends signals to the Speed Control Amplifier.

Pressing and holding SET/ACCEL speeds up the car. The vehicle's speed increases as long as SET/ACCEL is depressed. Releasing SET/ACCEL gives the system new set speed to maintain. vehicle speed may also be increased by depressing the accelerator until the higher speed is reached, then depressing and releasing SET/ACCEL.

Pressing and holding COAST slows down the vehicle. The vehicle speed decreases as long as COAST is depressed. Releasing COAST gives the system a new set speed to maintain.

OFF

Press OFF turns off the system (ground LB/BK wire). The system is also turned off when the brake pedal is depressed (power through R/LG wire) or the Ignition Switch is turned OFF. The Vacuum Dump Valve also operates when the brake pedal is depressed. This is a backup device to release the servo. In vehicles with manual transaxle, the Clutch Switch opens when the clutch pedal is depressed and turns off the system.

When the system has been deactivated by depressing the brake or clutch pedal, the last set speed may be resume by press RESUME. This feature will not work if OFF has been depressed or if car speed has dropped below 30 mph.