1991 Ford Aerostar Cruise Control Isn't Working

Fixing Cruise Control Issues in 1991 Ford Aerostar

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 1991 Ford Aerostar cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the initial steps to diagnose the non-functioning cruise control in a 1991 Ford Aerostar?

When diagnosing the non-functioning cruise control in a 1991 Ford Aerostar, it's essential to adopt a methodical diagnostic approach. Begin by checking the fuse associated with the cruise control system, as a blown fuse is a straightforward issue that can easily be resolved. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can prevent engagement. Following this, verify the speed sensor's functionality, since it plays a crucial role in maintaining the vehicle's speed. Additionally, examine the vacuum lines for any leaks or damages, as these can significantly impact the system's performance. It's also important to test the brake pedal switch, which should disengage the cruise control when pressed; a malfunction here can lead to issues. Finally, consider using a diagnostic scanner to check for any error codes that may provide insight into specific problems affecting the cruise control system. By following these steps in order, you can effectively diagnose and address the issues with your cruise control, ensuring a smoother driving experience.

What are the common problems that could cause the cruise control to stop working in a 1991 Ford Aerostar?

When dealing with a malfunctioning cruise control system in a 1991 Ford Aerostar, it's essential to understand the common problems that could be at play. One frequent culprit is a failed control module, sensor, or switch, which can disrupt the system's functionality. Additionally, throttle actuation problems may arise, preventing the cruise control from maintaining speed effectively. Over time, the cruise control module itself can experience wear and tear, leading to operational issues. It's also worth checking for a blown fuse, as this can easily interrupt the power supply to the cruise control system. Lastly, a defective brake pedal switch can cause the cruise control to disengage unexpectedly, as this switch is crucial for the system's safety features. By systematically examining these components, DIY enthusiasts can identify and address the root cause of the cruise control failure, restoring functionality to their vehicle.

How urgent is it to repair the non-functioning cruise control in a 1991 Ford Aerostar?

While the non-functioning cruise control in your 1991 Ford Aerostar may not seem like an urgent repair, it is important to consider the overall impact on your driving experience. Cruise control enhances comfort during long drives, allowing you to maintain a steady speed without constant pedal pressure, which can significantly reduce fatigue on extended trips. If you frequently travel on highways, having a working cruise control system can make your journeys more enjoyable and less taxing. Although neglecting this repair won't pose immediate safety risks, addressing it in a timely manner can prevent potential complications down the line, such as increased wear on your vehicle's components from manual speed adjustments. Therefore, while it may not be critical, repairing your cruise control can enhance your driving comfort and should be considered if you value a smoother, more relaxed driving experience.

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