1990 Mazda MX-6 Cruise Control Isn't Working

Diagnosing Common Issues with the Cruise Control System in Your 1990 Mazda MX-6 and How to Fix Them

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Reviewed by
Bo Fader
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 1990 Mazda MX-6 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.

How much does it cost to fix a 1990 Mazda MX-6 cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

When the throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.

Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

What are the steps to diagnose the non-functioning cruise control in a 1990 Mazda MX-6?

To effectively diagnose the non-functioning cruise control in your 1990 Mazda MX-6, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the fuse associated with the cruise control system, as a blown fuse is a common and easily fixable issue that can halt functionality. Next, evaluate the cruise control switch to ensure it is operational; a malfunctioning switch can prevent the system from engaging. Following this, examine the vacuum lines for any signs of leaks or damage, as these are crucial for the system's performance. If these initial checks do not resolve the issue, proceed to test the cruise control module, which may require repair or replacement if found defective. Additionally, verify the speed sensor's functionality, as it plays a vital role in maintaining a constant speed. Finally, using a diagnostic scanner to check for error codes can provide deeper insights into any underlying problems. By following this structured diagnostic approach, you can efficiently identify and address the root cause of your cruise control issues.

What are the common problems that could cause the cruise control to stop working in a 1990 Mazda MX-6?

When troubleshooting the cruise control system in a 1990 Mazda MX-6, it's essential to consider several common issues that may be at play. Start by checking the fuse associated with the cruise control; a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control switch for any signs of wear or malfunction, as a faulty switch can prevent the system from engaging or disengaging properly. Additionally, look for vacuum leaks in the system, as these can significantly affect performance. The speed sensor is another critical component; if it's faulty, the cruise control may struggle to maintain the desired speed. Don't overlook the brake light switch, as issues here can interfere with the cruise control's operation. Lastly, examine the throttle cable for any malfunctions, as this can hinder the system's ability to maintain speed effectively. By systematically checking these components, you can identify and potentially resolve the issues affecting your cruise control system.

How urgent is it to address the non-functioning cruise control in a 1990 Mazda MX-6?

When it comes to a non-functioning cruise control in a 1990 Mazda MX-6, the urgency of addressing the issue cannot be overstated. While it may not seem like an immediate emergency, neglecting this problem can lead to significant safety risks and potential damage to the vehicle's electrical system. A malfunctioning cruise control system often points to underlying issues that could affect other components, making it crucial to investigate the root cause. For DIY enthusiasts, this means taking the time to inspect the vehicle's sensors, wiring, and control modules. By addressing the problem promptly, you not only enhance your driving experience by restoring the convenience of cruise control but also ensure that your vehicle remains safe and reliable on the road. Ignoring the symptoms could lead to more extensive repairs down the line, so it’s wise to tackle this issue sooner rather than later.

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Troubleshooting 1990 Mazda MX-6 Cruise Control Problems