Appreciate the "Ask Me".
To my knowledge, Cruise Control would be relatively difficult to diagnose without a scan tool attached to the control module to read the error codes. Additionally, car versions in my country seldom have such a device since our roads are narrower and travel distance is not that great.
Though most known causes are:
- the connector to the module;
loose brake pedal/switch;
loose clutch pedal/switch (for manual transmission);
vacuum line to actuator (most likely), vacuum actuator, diaphragm, control valve.
Other possible components to check are:
- the control module itself (bolted to the firewall);
- control cable or linkage;
- speedometer sensor;
- steering wheel controls switches;
- throttle position sensor.
As posted above, quite a number of possibilities. Any other indications, speedometer OK; abnormal throttle responses; abnormal idling, brake light always ON, slack in the accelerator/gas pedal? Was it cutting in/out before? Was there any recent repair work done on the engine before the cruise control cut out?
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.