1991 Subaru Loyale Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 1991 Subaru Loyale and How to Fix Them

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Reviewed by
Aisha
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 Subaru Loyale cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty sensor can lead to incorrect readings, causing issues with engine performance or triggering warning lights on the dashboard.
  • Control Module: A faulty control module can result in 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 acceleration and poor engine 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 first steps to diagnose cruise control issues in a 1991 Subaru Loyale?

When diagnosing cruise control issues in a 1991 Subaru Loyale, it's essential to adopt a systematic approach that begins with the most straightforward solutions. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Locate the fuse box and identify the specific fuse for the cruise control; replacing it may resolve the issue immediately. Next, inspect the vacuum lines connected to the cruise control actuator. Look for any signs of wear or damage, such as holes or cracks, which could impede the vacuum pressure necessary for proper operation. Consulting the owner's manual can provide valuable insights into the fuse box layout and wiring diagrams, helping you identify any electrical problems. Finally, consider the mechanical components of the system, particularly the cruise control cables. In older models like the Loyale, these cables can become frayed or disconnected, affecting the system's ability to maintain speed. By following these steps, you can effectively narrow down the potential causes of cruise control malfunctions and take the necessary actions to restore functionality.

What common issues cause cruise control failure in a 1991 Subaru Loyale?

When diagnosing cruise control failure in a 1991 Subaru Loyale, it's essential to consider several common problems that may be at play. One of the first areas to check is the electrical system, particularly the fuse and brake pedal switch, as a blown fuse or a defective switch can easily disrupt the cruise control functionality. Additionally, issues with the throttle control system or the anti-lock braking system (ABS) can also interfere with cruise control operations, so inspecting these components is crucial. For those dealing with older models, a broken vacuum line is a frequent culprit that can prevent the cruise control from maintaining speed. Lastly, if your Loyale is equipped with a mechanical cruise control system, a severed cruise control cable may hinder speed adjustments, making it vital to examine this cable for any signs of wear or damage. By understanding these common issues, DIYers can effectively troubleshoot and address cruise control failures in their Subaru Loyale.

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

When considering the urgency of repairing the non-functioning cruise control in your 1991 Subaru Loyale, it's essential to weigh both your driving habits and the potential safety implications. While cruise control is primarily a convenience feature, its malfunction could signal underlying issues with critical systems, such as the brake or electrical components. If you frequently rely on cruise control for long drives, addressing the repair promptly can enhance your comfort and reduce fatigue. However, neglecting this issue could lead to more significant problems, especially if the malfunction is indicative of a broader electrical failure. This not only compromises your driving experience but could also pose safety risks on the road. Therefore, consulting with a mechanic to diagnose the root cause of the malfunction is advisable, ensuring that you maintain both the functionality of your vehicle and your safety while driving.

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1991 Subaru Loyale Cruise Control Issues & Repairs