1999 Mitsubishi Montero Cruise Control Isn't Working

Fixing Cruise Control Issues in 1999 Mitsubishi Montero

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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 1999 Mitsubishi Montero 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 1999 Mitsubishi Montero 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.

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.

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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 1999 Mitsubishi Montero?

To effectively troubleshoot the non-functional cruise control in your 1999 Mitsubishi Montero, start with the simplest checks before moving on to more complex diagnostics. Begin by inspecting the cruise control fuse; a blown fuse is a common culprit that can easily be replaced. Next, examine the cruise control switch located on the steering wheel, as a malfunctioning switch may prevent the system from engaging. It's also crucial to verify the brake pedal switch, since if this switch is faulty, it can disable the cruise control entirely. Additionally, check the vehicle speed sensor, which is vital for the cruise control's operation, ensuring it is functioning correctly. Finally, utilize a diagnostic scanner to check for any stored error codes in the vehicle's onboard system, as these codes can provide insights into specific issues affecting the cruise control. By following these steps, you can systematically identify and address the problems with your cruise control system, making your DIY troubleshooting more effective.

What are the common problems that could cause the cruise control to stop working in a 1999 Mitsubishi Montero?

When troubleshooting the cruise control system in a 1999 Mitsubishi Montero, it's essential to consider several common problems that could be causing the malfunction. One of the first areas to check is the cruise control switch, as a faulty switch can prevent the system from engaging properly. Additionally, a blown fuse may disrupt the electrical flow necessary for the cruise control to function, so inspecting the fuses is a crucial step. Another potential issue is vacuum leaks within the cruise control system, which can significantly affect its performance. The speed sensor also plays a vital role; if it is defective, the cruise control may not maintain speed or could disengage unexpectedly. Furthermore, the brake light switch is essential for the cruise control's operation, and any issues here can prevent activation. Lastly, ensure that the throttle cable is functioning correctly, as any malfunctions can hinder the system's ability to maintain speed. By systematically checking these components, you can effectively diagnose and resolve the cruise control issues in your Montero.

How urgent is it to address the non-functioning cruise control in a 1999 Mitsubishi Montero?

When it comes to the non-functioning cruise control in a 1999 Mitsubishi Montero, understanding the urgency of the situation is crucial for any DIY enthusiast. While the immediate safety of the vehicle may not be compromised, neglecting this issue can lead to more significant problems down the line. The cruise control system is intricately linked to the vehicle's electrical components and sensors; thus, a malfunction could indicate deeper underlying issues that might affect overall vehicle performance. Addressing the cruise control problem promptly not only enhances your driving experience by reducing fatigue and improving fuel efficiency but also prevents potential complications that could arise from unresolved electrical issues. Therefore, while it may not be an emergency, it is advisable to inspect and repair the cruise control system at your earliest convenience to ensure your Mitsubishi Montero remains in optimal condition.

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