1992 Mitsubishi Diamante Cruise Control Isn't Working

Diagnosing Common Issues with Cruise Control in Your 1992 Mitsubishi Diamante 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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 1992 Mitsubishi Diamante 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 1992 Mitsubishi Diamante 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 initial steps to diagnose the non-functioning cruise control in a 1992 Mitsubishi Diamante?

When diagnosing the non-functioning cruise control in a 1992 Mitsubishi Diamante, it's crucial to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the cruise control system, as a blown fuse is a common and easily fixable issue that can halt functionality. Next, inspect 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 can significantly impact the system's performance by disrupting vacuum pressure. If these initial checks do not resolve the issue, proceed to test the cruise control module to confirm it is properly sending and receiving signals. Lastly, verify the speed sensor's functionality, as a faulty sensor can hinder the cruise control's ability to maintain speed. By methodically working through these steps, you can effectively diagnose and address the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 1992 Mitsubishi Diamante?

When dealing with a malfunctioning cruise control system in a 1992 Mitsubishi Diamante, it's crucial to understand the common problems that may be at play. One of the first things to check is the fuse associated with the cruise control; a blown fuse can easily disrupt the system's functionality. If the fuse is intact, the next step is to inspect the cruise control switch, as a faulty switch can prevent the system from engaging or disengaging properly. Additionally, vacuum leaks are a frequent culprit, as they can interfere with the system's operation, leading to inconsistent performance. Another important component to examine is the speed sensor; if it is malfunctioning, the cruise control may struggle to maintain a steady speed. Furthermore, issues with the brake light switch can also hinder the cruise control's ability to function correctly, as it relies on this switch to know when to disengage. Lastly, don’t overlook the throttle cable, as any malfunction here can impact the system's ability to maintain speed effectively. By systematically checking these components, DIYers can accurately diagnose and address the cruise control issues in their Mitsubishi Diamante.

How urgent is it to repair the non-functioning cruise control in a 1992 Mitsubishi Diamante?

Repairing the non-functioning cruise control in a 1992 Mitsubishi Diamante should be approached with a sense of urgency, even if immediate safety risks may not be apparent. While the absence of cruise control may not pose an immediate threat, it can lead to unexpected speed fluctuations that compromise driving safety, particularly on long journeys. Additionally, the lack of this feature can detract from overall driving comfort, making extended trips more tiring and less enjoyable. Furthermore, a malfunctioning cruise control system can negatively impact the vehicle's resale value, as potential buyers often seek this convenience feature. Addressing the repair promptly not only enhances your driving experience but also safeguards the vehicle's worth, making it a worthwhile investment for any owner.

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