1997-2000 Montero Sport ABS Module: Solving the ABS Light and Ensuring Compatibility
This guide covers diagnosing, replacing, and finding the right used ABS control module for your 1997-2000 Mitsubishi Montero Sport, which does not require dealer programming.
- This ABS module is plug-and-play; no dealer programming is required for a replacement.
- You must verify the part number MR400413 on your original module to ensure compatibility.
- The most common symptom of failure is a persistent ABS warning light on the dashboard.
- Replacing the module requires opening brake lines, so bleeding the entire brake system afterward is mandatory for safety.
Symptoms of a Failing ABS Control Module
When the ABS control module in a 1997-2000 Montero Sport begins to fail, it will typically alert you with clear warning signs. The most common symptom is the illumination of the ABS warning light on your dashboard. This light indicates the system has detected a fault and has been disabled.
- ABS Warning Light is On: This is the most direct indicator of a problem within the anti-lock braking system. The light may stay on constantly.
- Brakes Lock Up: Without a functioning ABS, the vehicle's wheels can lock during hard braking, causing a skid. This is most noticeable in emergency situations or on low-traction surfaces.
- Unusual Brake Pedal Behavior: A malfunctioning module can sometimes cause abnormal braking behavior, particularly at low speeds.
- Strange Noises: In some cases, a failing ABS pump motor, which is part of the overall ABS unit, may make a humming or buzzing noise.
A professional scan tool can read specific Diagnostic Trouble Codes (DTCs) from the ABS system to help pinpoint the issue. While generic OBD-II scanners may not read these codes, a more advanced tool can identify issues like open or short circuits in wheel speed sensors or internal module failures. Common ABS-related codes often point to wheel speed sensor faults (like C0035) or internal module or pump issues (like C0110 or C0121).
Known Issues, Recalls, and TSBs
For the 1997-2000 Mitsubishi Montero Sport, there are no specific recalls issued by the National Highway Traffic Safety Administration (NHTSA) for the ABS control module itself. However, there was a recall for the 2000 model year concerning brake vacuum hoses on 3.5L engine models, which could affect brake performance but is unrelated to the ABS module. Other recalls for this generation involved issues like incorrect information labels and airbag inflators. While no official TSBs directly address widespread failure of this specific ABS module, common failure points for ABS modules of this era include internal electronic component failure and corrosion from moisture.
Important: A persistent ABS light is often caused by a faulty wheel speed sensor, not the module itself. It's wise to test the wheel speed sensors and their wiring for continuity and damage before condemning the more expensive ABS module.
Buying a Used ABS Control Module
Since new OEM modules are extremely expensive or discontinued, and aftermarket options are limited, a quality used OEM module is the most practical solution. Here’s what to look for:
- Verify the Part Number: This is the most critical step. The ABS control module for the 1997-2000 Montero Sport must have the OEM part number MR400413 printed on it. The Mitsubishi Electric number may be X2T34975. Always match this number to your original part before purchasing.
- Physical Inspection: Carefully inspect the used module. Look for any cracks in the black plastic housing, signs of corrosion on the aluminum valve block, and check that all electrical connector pins are straight and clean. Avoid units with heavy corrosion or physical damage.
- Check the Location: The module is located in the right-hand (passenger side) rear of the engine compartment. Confirming the location helps ensure you are looking at the correct part.
- Why Used OEM is a Good Choice: For an electronic part of this vintage, an original OEM unit from a reputable recycler is often more reliable than a new, unproven aftermarket part. The original Mitsubishi Electric components were built to a high standard for their time.
Replacement and Programming
Is Programming Required?
No, the ABS control module for the 1997-2000 Mitsubishi Montero Sport is plug-and-play. It does not need to be programmed, flashed, or coded to the vehicle's VIN. This is a significant advantage, as it means you can install a replacement unit without a trip to the dealer or needing specialized scan tools. The vehicle's immobilizer and keyless entry systems are separate and are not linked to the ABS module.
Replacement Steps Overview
Replacing the module is a moderately difficult job, mainly because it requires bleeding the brake system afterward.
- Disconnect the Battery: Always disconnect the negative battery terminal before working on any electronic components.
- Locate the Module: Find the ABS unit in the rear passenger-side corner of the engine bay.
- Disconnect Electrical Connector: Carefully unplug the main wiring harness from the module.
- Disconnect Brake Lines: Using a flare nut wrench to avoid stripping the fittings, carefully disconnect the brake lines from the ABS hydraulic unit. Be prepared for some brake fluid to leak; have rags ready and plug the lines if possible.
- Remove Mounting Bolts: Unbolt the module and its bracket from the vehicle body.
- Install the New Unit: Installation is the reverse of removal. Secure the new module, reconnect the brake lines (do not overtighten), and plug in the electrical connector.
- Bleed the Brakes: This step is mandatory. Because you opened the hydraulic system, air has entered the lines. You must bleed the entire brake system, starting from the wheel furthest from the master cylinder and working your way closer, to remove all air. Failure to do so will result in a spongy, unsafe brake pedal.
Pro Tip: Some experienced mechanics separate the electronic control module from the hydraulic pump assembly to avoid opening the brake lines. This involves removing several small Torx screws. While this saves you from having to bleed the brakes, it can be a delicate process. For most DIY mechanics, replacing the entire unit and bleeding the brakes is the safer, more straightforward method.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM | $850 - $1150+ |
| New Aftermarket | Not commonly available |
| Remanufactured (e.g., Cardone) | $250 - $400 (if available) |
| Used OEM | $75 - $200 |
| Shop Labor for Replacement | $150 - $250 (includes brake bleeding) |
Frequently Asked Questions
Does the 1997-2000 Montero Sport ABS module need to be programmed?
No, it does not. This module is a direct-fit, plug-and-play part. You can install a used unit with the same part number (MR400413) without any need for dealer programming or special tools.
Where is the ABS control module located?
The ABS control module is located in the engine compartment on the passenger side (RH side), near the firewall.
Can I drive my Montero Sport with a bad ABS module?
Yes, but with caution. When the ABS module fails, the ABS warning light will come on, and the anti-lock braking function will be disabled. Your standard brakes will still work, but your wheels can lock up during a hard stop, increasing the risk of skidding. It is a safety system, and driving without it is not recommended.
What causes the ABS module to fail?
Failures are typically due to age-related issues with the internal electronics. This can include cracked solder joints from thousands of heat cycles or failure of individual components on the circuit board. Corrosion from moisture getting past seals can also damage the electronics or the hydraulic valve body.
Technical Specifications
OEM Part Numbers: MR400413 X2T34975
Located in the right-hand rear of the engine compartment.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mitsubishi Montero Sport: