Cruise control can be very convenient during a long drive or when on the highway. By setting a speed, you can relax your foot and let the car maintain speed. More modern cruise control systems even lets you to maintain speed and a certain distance behind the car in front of you. When cruise control fails, it can be annoying, but when it fails suddenly it may be hazardous. A sudden failure by the cruise control may mean your car is rapidly decelerating. Even when cruise control is on, it is important to remain a vigilant driver.
How this system functions:
Cruise control systems has been replaced as cars have become more modern. Newer vehicles use a fully electronic setup to maintain speed and may be able to maintain speed and distance behind the vehicle in front of you. These systems are controlled through the car’s computer or ECU (electronic control unit). Older vehicles may use what is called electromechanical cruise control. In this setup, a vacuum actuator is physically connected to the throttle by a cable or chain. The cable adjusts to increase or decrease throttle position based upon the actions of the actuator. A mechanic will let you know what kind of setup you have on your car.
Common reasons for this to happen:
- Bad Fuse:Like other electronically controlled systems in your vehicle, the cruise control has a corresponding fuse which will blow to protect the system if it senses a short circuit. When the fuse of for the cruise control blows, the cruise control will cease working altogether.
- Failing Brake Pedal Switch:The brake pedal switch turns on the cars brake lights when it senses that the brake pedal has been pressed. Because cruise control systems is designed to disengage when the brake pedal is pressed, the cruise control is wired to the brake pedal switch. If the brake pedal switch fails, the vehicle may think the brakes are engaged and not allow the cruise control system to turn on.
- Failing Speed Sensor:A speed sensor has many uses including indicating the speed of the vehicle, regulating flow of fuel and ignition timing, and operating the cruise control. If the speed sensor fails the cruise control may stop functioning. You may also notice that the speedometer has stopped working and the engine has more difficulty when idling.
- Damaged Vacuum Actuator/Hoses/Cable:On older cars, cruise control speed is maintained using a vacuum actuator and a cable connected to the throttle. A car’s cruise control may stop working if the vacuum actuator has stopped working or if there is damage to the vacuum hoses. The system may also fail if the cable linking the actuator to the throttle is broken.
How it is fixed:
The mechanic may first want to connect to the vehicle’s ECU through a code reader/scanner. This will let the mechanic to read and trouble codes and better diagnose what part may have failed.
If the mechanic realises that there is a bad fuse, he or she will find the corresponding fuse for the cruise control system to see if it has failed. If the fuse has blown, the mechanic will remove it and change it with a fuse rated for the correct amperage.
If the mechanic thinks that the brake pedal switch has failed, he or she will examine the switch to check for any superficial damage. The mechanic should then check the wiring connected to the switch and replace it if necessary. When the switch has been chnaged, the mechanic should make sure that both the brake lights and the cruise control system are working correctly.
To check the speed sensor, the mechanic will have to get underneath the car. While underneath, the mechanic will find the sensor and examine it and the surrounding wires for damage. The mechanic will then change the sensor and then check the wires going from the sensor up to the speedometer and cruise control switches to endure that they are not frayed.
If the mechanic believes that the vacuum actuator or the corresponding hoses and cable have failed, he or she will open the hood and find the actuator. The mechanic will first check the hoses and cable to make sure that they are in good working order. He or she will then change the actuator as necessary.
In all of these repair situations the mechanic will ask to test drive the vehicle to make sure that the cruise control is working properly. He or she should also use their code reader/scanner to clear any trouble codes that may have been produced when the cruise control system was not working.
SEE ALSO:HOW TO REPAIR THROTTLE CABLE
How important is Cruise control fix?
A failed cruise control system can be a sign that other repairs may need to be made soon. By checking the cruise control, the mechanic is likely to also inspect other systems on the vehicle including the brake lights and speedometer. While driving without cruise control may be an inconvenience, a sudden failure of the cruise control system could be potentially dangerous for a driver who is not vigilant. If you notice that your car’s cruise control has stopped working you should have a mechanic check it to knnow the nature of the problem.