2004 Mazda Miata Cruise Control Isn't Working

Diagnosing Common Issues with Cruise Control in Your 2004 Mazda Miata 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 2004 Mazda Miata 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 2004 Mazda Miata 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.

If the cruise control refuses to turn on at all, the actuator could be at fault. Likewise, if the cruise control stays on but does not maintain a consistent speed, the problem could be a bad actuator. In extreme cases, a malfunctioning actuator could cause the throttle to stick and prevent the vehicle from slowing down. These symptoms may point to a bad actuator. They may also point to other problems with the cruise control and related systems.

What are the steps to diagnose the cruise control issue in a 2004 Mazda Miata?

To effectively diagnose a cruise control issue in a 2004 Mazda Miata, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the fuse associated with the cruise control system, as a blown fuse is a common and easily rectifiable problem. Next, assess the functionality of the cruise control switch; a malfunctioning switch can prevent the system from engaging. Following this, examine the brake pedal switch, which is crucial for disengaging the cruise control when brakes are applied. If these components are functioning correctly, proceed to test the vehicle speed sensor, as it is vital for maintaining a consistent speed. Utilizing an OBD-II scanner to check for error codes can provide further insights into any underlying issues. Finally, inspect the wiring and connections for any signs of damage or looseness, as faulty wiring can disrupt the system's operation. By following this structured diagnostic approach, you can efficiently identify and address the cruise control issue in your Mazda Miata.

What are the common problems that could cause the cruise control to stop working in a 2004 Mazda Miata?

When dealing with a malfunctioning cruise control system in a 2004 Mazda Miata, it's crucial to understand the common problems that could be at play. One of the first areas to check is the cruise control switch, as a faulty switch can prevent the system from engaging or disengaging properly. Additionally, a blown fuse may disrupt the electrical flow necessary for the cruise control to function, so inspecting the fuses is a good starting point. Another potential issue is vacuum leaks, which can hinder the system's ability to maintain speed effectively. The speed sensor is also a critical component; if it is defective, it can lead to inaccurate speed readings, causing the cruise control to malfunction. Furthermore, the brake light switch should be examined, as a faulty switch can prevent the cruise control from activating due to safety protocols. Lastly, issues with the throttle cable can interfere with the system's ability to adjust speed accurately. By systematically checking these components, DIYers can effectively diagnose and address the cruise control issues in their Mazda Miata.

How urgent is it to address the non-functioning cruise control in a 2004 Mazda Miata?

When it comes to the non-functioning cruise control in a 2004 Mazda Miata, understanding the urgency of the repair is crucial for maintaining both safety and driving comfort. While the malfunction may not present an immediate safety hazard like a failing brake system, it can still significantly affect your driving experience, especially on long trips where cruise control is typically utilized. Ignoring this issue could lead to increased fuel consumption, as drivers may find themselves accelerating and decelerating more frequently without the aid of cruise control. Moreover, delaying repairs might allow underlying problems to escalate, potentially resulting in more extensive and costly damage to the vehicle. Therefore, while it may not be the top priority compared to other mechanical issues, addressing the non-functioning cruise control promptly is advisable to ensure a smoother, more efficient driving experience and to prevent further complications down the road.

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2004 Mazda Miata Cruise Control Issues & Repair Costs