Cruise Control: Description and Operation

DESCRIPTION
The Speed Control System is powered by 10A Fuse 6 of the Interior Fuse Panel and is hot with the Ignition Switch in the "ACCY" or "RUN" position.

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.

OPERATION
To operate the Speed Control System, the engine must be running and the vehicle speed must be greater than 30 mph. The system is put into standby mode by pressing the "ON" switch of the Speed Control Switch.

Pressing and releasing "SET/ACCEL" or "COAST" sends a command to hold the present speed.

NOTE: The speed control will not hold speed when the "SET/ACCEL" or "COAST" button is pushed, unless the "ON" button is pushed first.

The Speed Sensor (at the transmission) sends signals to the Speed Control Amplifier. These signals tell the amplifier to increase or decrease the vacuum at the Servo Motor to keep the vehicle at the set speed.

OPERATING MODES
Pressing and holding "SET/ACCEL" speeds the vehicle up. The vehicle speed increases as long as "SET/ACCEL" is depressed. Vehicle speed may also be increased by depressing the accelerator until the higher speed is reached, and then pressing and releasing "SET/ACCEL".

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

Pressing "OFF" or turning the Ignition Switch to the "OFF" position turns the system off (set speed not maintained). The system returns to standby mode when the brake pedal is depressed. The Vacuum Dump Valve also operates when the brake pedal is depressed. This is a backup device which relaxes the servo. In vehicles with manual transmission, the Clutch Switch opens when the clutch is depressed and returns the system to standby mode also.

When the system has been deactivated by depressing the brake or clutch pedal, the last set speed may be resumed by pressing "RESUME". This feature will not work if "OFF" has been depressed or if vehicle speed is below 30 mph or if the Ignition Switch has been turned "OFF" since the speed was set.