1993 Mitsubishi 3000GT Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 1993 Mitsubishi 3000GT

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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 1993 Mitsubishi 3000GT 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 1993 Mitsubishi 3000GT 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.

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 initial steps to diagnose the non-functional cruise control in a 1993 Mitsubishi 3000GT?

To effectively diagnose the non-functional cruise control in your 1993 Mitsubishi 3000GT, start with the simplest solutions before delving into more complex issues. Begin by checking the fuse associated with the cruise control system; a blown fuse is a common culprit that can easily be overlooked. Next, inspect the cruise control switch for any visible damage or wear, as a malfunctioning switch can prevent the system from engaging. Following this, examine the vacuum lines for leaks or damage, since any loss of vacuum pressure can significantly impact the cruise control's performance. If these initial checks do not resolve the issue, utilize a diagnostic tool to test the cruise control module for error codes, as a faulty module may require replacement. Lastly, ensure that the throttle cable is properly adjusted and functioning smoothly, as any sticking or misalignment can interfere with the cruise control operation. By systematically addressing these areas, you can effectively identify and resolve the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1993 Mitsubishi 3000GT?

When troubleshooting the cruise control system in a 1993 Mitsubishi 3000GT, it's essential to understand the common problems that may lead to its failure. One of the primary culprits could be a faulty cruise control switch, which may prevent the system from engaging or disengaging properly. Additionally, a defective cruise control module can disrupt the entire system's functionality, making it crucial to check this component. Vacuum leaks are another frequent issue, as they can interfere with the system's operation by affecting the pressure needed for proper engagement. Furthermore, a malfunctioning speed sensor can hinder the cruise control's ability to maintain a constant speed, leading to operational failures. Electrical issues, such as blown fuses or damaged wiring, can also play a significant role in the system's performance. Lastly, a faulty brake light switch can prevent the cruise control from engaging, as it is designed to disengage the system when the brakes are applied. By systematically examining these potential issues, DIY enthusiasts can effectively diagnose and resolve cruise control problems in their Mitsubishi 3000GT.

How urgent is it to repair the non-functioning cruise control in a 1993 Mitsubishi 3000GT?

When evaluating the urgency of repairing the non-functioning cruise control in your 1993 Mitsubishi 3000GT, it's essential to weigh the potential consequences of inaction. While cruise control is primarily a convenience feature, its malfunction can lead to increased driver fatigue during long trips, which may compromise safety. If the system's failure is linked to other vehicle components or poses a risk of distraction, addressing the issue promptly becomes more critical. Additionally, if you rely heavily on cruise control for a more comfortable driving experience, the inconvenience of its absence may prompt you to prioritize the repair. Furthermore, maintaining all vehicle features, including cruise control, can enhance your car's resale value, making it a worthwhile investment in the long run. Ultimately, the decision hinges on your personal driving habits and how much you value the comfort and safety that a functioning cruise control system provides.

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1993 Mitsubishi 3000GT Cruise Control Issues & Repairs