1997 Mazda Millenia Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 1997 Mazda Millenia and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 1997 Mazda Millenia 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 1997 Mazda Millenia 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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

What are the steps to diagnose the non-functioning cruise control in a 1997 Mazda Millenia?

To effectively diagnose the non-functioning cruise control in your 1997 Mazda Millenia, start with 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 fixable issue. Next, evaluate the cruise control switch to ensure it is operational; a malfunctioning switch can prevent the system from engaging. Following this, check the brake pedal switch, which is crucial for safety, as it disengages the cruise control when the brake is applied. If these components are functioning correctly, turn your attention to the speed sensor, as its failure can disrupt the cruise control's operation. Additionally, inspect the vacuum lines for any leaks or damage, particularly since older vehicles often rely on these for cruise control functionality. Finally, using an OBD-II scanner can help identify any error codes that may indicate specific problems within the system. By following this diagnostic approach, you can systematically identify and address the issues affecting your cruise control, ensuring a thorough and effective troubleshooting process.

What are the common problems that could cause the cruise control to stop working in a 1997 Mazda Millenia?

When dealing with a malfunctioning cruise control system in a 1997 Mazda Millenia, it's crucial to understand the common problems that could be at play. One of the primary culprits is a faulty cruise control switch, which can prevent the system from engaging properly. Additionally, a blown fuse within the cruise control circuit can disrupt functionality, making it essential to check the fuse box for any issues. Another potential problem is vacuum leaks, which can significantly affect the system's performance by disrupting the necessary pressure. A defective speed sensor may also be responsible, as it can lead to erratic behavior or disengagement of the cruise control. Furthermore, issues with the brake light switch can inhibit activation, while a malfunctioning throttle cable can hinder the system's ability to maintain speed. By systematically diagnosing these areas, DIYers can effectively identify and resolve the underlying issues affecting their cruise control system.

How urgent is it to address the non-functioning cruise control in a 1997 Mazda Millenia?

Addressing a non-functioning cruise control in a 1997 Mazda Millenia should be considered a priority for any DIY vehicle owner. While it may not seem like an immediate emergency, the implications of ignoring this issue can be significant. A malfunctioning cruise control system can indicate deeper problems within the vehicle's electrical system or sensors, which, if left unresolved, could lead to more severe mechanical failures. Moreover, the convenience of cruise control enhances driving comfort, especially on long trips, by reducing fatigue and improving fuel efficiency. Neglecting this feature not only compromises the driving experience but could also pose safety risks, particularly on highways where maintaining a steady speed is crucial. Therefore, it is advisable to investigate and resolve any cruise control issues promptly to ensure the vehicle operates safely and efficiently, ultimately enhancing both performance and driver comfort.

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1997 Mazda Millenia Cruise Control Issues & Repair Costs