Throttle Position Sensor (TPS) for 1990-1996 Mitsubishi Mighty Max
If your Mighty Max hesitates, idles rough, or has shifting problems, a failing throttle position sensor could be the culprit.
- A bad TPS can cause hesitation, rough idle, and automatic transmission shifting problems.
- Replacement is simple and can be done at home with basic tools in under an hour.
- Verify if your truck has the 2.4L or 3.0L V6 engine and check the pin count to ensure you order the correct part.
- Aftermarket brands like Standard Ignition and Walker Products offer reliable, cost-effective alternatives to hard-to-find OEM parts.
Signs of a Failing Throttle Position Sensor
A bad throttle position sensor can make your Mighty Max difficult to drive. Because the sensor sends critical information to the engine computer, a failure can cause a wide range of problems. You might notice one or more of the following issues:
- Poor Acceleration: The truck may feel sluggish, hesitate, or bog down when you press the gas pedal.
- Rough or Erratic Idle: Your engine might idle too high, too low, or surge up and down on its own.
- Automatic Transmission Problems: If you have an automatic, it might not shift gears correctly, or the shifts might be harsh or delayed.
- Stalling: The engine may stall unexpectedly, especially when idling or when you let off the gas.
- Check Engine Light: A failing TPS will often trigger the Check Engine Light on your dashboard. A diagnostic scan might show codes like P0120 through P0125.
Is It the TPS or Something Else?
Some of these symptoms, like a rough idle or power loss, can also be caused by other issues like a dirty throttle body, a clogged fuel filter, or a bad mass airflow sensor. It's a good idea to clean the throttle body and check for other trouble codes before replacing the TPS.
Choosing the Right Aftermarket TPS
For a vehicle like the 1990-1996 Mighty Max, finding an original Mitsubishi (OEM) part can be difficult and expensive. Aftermarket parts are a popular and affordable solution. Here's a look at the available brands:
Tier 1: Reputable Aftermarket Brands
- Standard Ignition (SMP): Often considered a top-tier aftermarket manufacturer, Standard makes direct-fit sensors designed to meet or exceed original specifications. They emphasize quality control and use durable materials to ensure a long service life.
- Walker Products: With a long history in fuel and engine management parts, Walker is another reliable choice. They produce sensors engineered to match OE fit and function and perform 100% testing to ensure performance.
Tier 2: Standard Replacement Brands
- Global Parts (GPD): GPD offers direct-fit replacement sensors that are designed to meet OE form and function and are 100% tested. They provide a functional, budget-friendly option.
- Replacement: This brand offers an economical choice for drivers needing to get their truck back on the road without a large investment. These parts are designed as direct replacements for the original sensor.
Pro Tip: Check Your Engine
The Mitsubishi Mighty Max was available with a 2.4L 4-cylinder engine and a 3.0L V6. These engines may use different throttle position sensors. Always verify the part fits your specific engine before ordering to avoid mistakes.
Cost of Replacing a Mighty Max TPS
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket | $40.43 - $132.51 |
| Shop Labor | $85 - $125 |
| Total Professional Replacement | $125 - $258 (Estimated) |
Note: Costs are estimates and can vary based on your location and the specific repair shop. The total professional replacement cost is an estimate combining the aftermarket part price range and estimated labor.
Frequently Asked Questions
Can I replace the Mighty Max TPS myself?
Yes, this is a DIY-friendly job for most home mechanics. The TPS is located on the side of the throttle body. It's typically held on by two screws and has a single electrical connector. The process involves disconnecting the battery, removing the old sensor, installing the new one, and reconnecting everything. No special tools are usually required.
Do I need to adjust the new TPS?
Some older vehicles require the TPS to be adjusted with a multimeter to ensure the correct voltage reading at idle. While many modern aftermarket sensors are designed to work correctly out of the box, it's a good practice to check for specific instructions or use a multimeter to verify the idle setting is within specification for your truck.
Are there any recalls for the Mighty Max TPS?
A search of the National Highway Traffic Safety Administration (NHTSA) database did not find any recalls specifically for the throttle position sensor on the 1990-1996 Mitsubishi Mighty Max.
What's the difference between a 3-pin and 4-pin sensor?
Different versions of the Mighty Max may use sensors with a different number of electrical pins in the connector. It is critical to visually inspect your old sensor or check the part compatibility chart to ensure you order a replacement with the correct pin count for your truck's wiring harness.
Technical Specifications
OEM Part Numbers: MD614488 MD614662 MD614405
Typically a 3-pin or 4-pin variable resistor sensor mounted to the throttle body. Compatibility varies between the 2.4L I4 and 3.0L V6 engines.
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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 Mighty Max: