Plastic Automotive Throttle Position Sensor MD614405 For Mitsubishi Dodge

The sensor operates by detecting the throttle valve position and converting mechanical rotation into an electrical signal. This sensor is a non-contact type that uses Hall-effect elements, in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds. The signal voltage varies proportionally with throttle opening, providing the ECU with continuous, real-time data for fuel injection and ignition timing adjustments.

The MD614405 features a 4-wire configuration with an integral Idle Position Switch (IPS). The ECU judges vehicle driving conditions from these signals, using them for air-fuel ratio correction, power increase correction, and fuel-cut control.

The Throttle Position Sensor MD614405 is identified by the following Original Equipment (OE) reference numbers and cross-references:

Common Reference Designations:

• Throttle Position Sensor (TPS)

• Sensor, Throttle Body Throttle

• Accelerator Throttle Position Sensor

• Throttle Potentiometer

Important Note: The MD614405 was used only on the Mitsubishi 3000GT (also known as the 3S platform) and Diamante for the 1991–1992 model years. For 1993+ models, MD614488 is the correct OE part number and is used on a broader range of vehicles including Mirage, Galant, Diamante, and Montero Sport. Several online stores list MD614488 as an alternative number for MD614405, but always verify compatibility with your specific vehicle before purchasing.

The Throttle Position Sensor MD614405 is an Original Equipment (OE) number primarily associated with Mitsubishi vehicles from the 1991–1992 production period.

Production Period:

• 1990.04.01 – 1992.05.3

Important Compatibility Notes:

• This sensor is an Original Equipment (OE) number for Mitsubishi 3000GT and Diamante models from 1991–1992

• Compatible with both manual and automatic transmission variants

• Always cross-check the OE reference number against the number found on your current unit to ensure proper fitment

• CRITICAL: The MD614405 is specifically for 1991–1992 models. For 1993 and later models, use MD614488

A failing or malfunctioning Throttle Position Sensor can produce a range of drivability issues. Below are the most common symptoms to watch for:

One of the earliest indicators of a TPS problem is the illumination of the Malfunction Indicator Lamp (Check Engine Light) on the dashboard. When the TPS malfunctions, the ECM will detect the abnormality and activate the engine warning light. Common diagnostic trouble codes (DTCs) associated with TPS failure include:

• P0120 – Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction

• P0121 – Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance

• P0122 – Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input

• P0123 – Throttle/Pedal Position Sensor/Switch "A" Circuit High Input

The most common symptom of a faulty TPS is hesitation whenever the accelerator is pressed. The vehicle may jerk or stumble because the malfunctioning sensor fails to send proper throttle position data, causing an imbalance in the air-fuel mixture needed for smooth acceleration.

A faulty TPS can cause the engine idle speed to fluctuate unpredictably. The idle may be too high or too low, leading to rough idling or "hunting" RPMs. The engine may also stall when the car is stopped.

Since the ECU relies on throttle position data to determine the correct air-fuel ratio, a defective sensor may cause incorrect fuel trims, leading to poor fuel consumption.

The throttle may become unresponsive or delayed when the accelerator pedal is pressed. This occurs because the ECU is not receiving accurate position data to adjust fuel delivery and ignition timing accordingly.

The vehicle may experience surging or shuddering during acceleration, especially at low speeds or when transitioning from a stop.

A failing TPS can cause a noticeable lack of power or poor acceleration response. The vehicle may feel sluggish or struggle to reach speed.

A malfunctioning TPS can cause harsh, delayed, or erratic shifting in automatic transmissions. The transmission control module uses TPS data as one of the inputs for shift timing.

• Wear and tear – Internal components wear over time due to repeated throttle movements

• Physical damage – Impact or mechanical stress can damage the sensor housing or internal components

• Open or short circuit – Wiring issues in the sensor circuit

• Moisture ingress – Liquid intrusion can cause corrosion and electrical shorts

• Improper adjustment – Incorrect calibration can lead to inaccurate readings

When sourcing or purchasing the Throttle Position Sensor MD614405, consider the following factors to ensure optimal performance and compatibility:

This is the most critical consideration. The MD614405 is specifically for 1991–1992 model year vehicles. For 1993 and later models, the correct part number is MD614488. Purchasing the wrong sensor for your model year will result in compatibility issues and may cause persistent check engine light problems. Always check your vehicle's production date (found on the driver's door jamb or VIN plate) to confirm the correct part number.

Ensure the sensor is compatible with your specific vehicle make, model, year, engine size, and transmission type. This sensor is primarily designed for Mitsubishi 3000GT (1991–1992) and Diamante (1991–1992). Selecting the wrong sensor can lead to poor engine response or persistent check engine light issues.

Verify that the sensor features the correct 4-wire connector configuration with integral Idle Position Switch (IPS). Confirm that the connector type and pin configuration match your vehicle's wiring harness.

Look for sensors constructed with durable automotive-grade materials. High-quality sensors are built to the same dimensional and material standards as the original part they replace, ensuring reliable performance and a long service life.

Prioritize products that meet or exceed OEM standards. Suppliers with ISO9001 certification demonstrate adherence to quality management systems.

When sourcing from suppliers, evaluate their quality assurance processes and production capacity. Look for evidence of:

• Strict quality control standards meeting OEM specifications

• 100% factory testing

• Full manufacturer traceability

• Warranty coverage (many suppliers offer 12-month warranties)

The sensor is mounted on the throttle body. During installation, ensure that:

• The sensor is properly aligned with the throttle shaft

• Mounting screws are tightened to the correct torque specification

• The connector is securely fastened

• The sensor is adjusted to the proper position to allow the voltage signal to the ECM to be within specification

• Proper clearance is maintained from ignition HT leads, coil leads, and other sources of electrical interference

Note: The TPS is not typically serviceable and in the event of a failure, the sensor must be replaced.

After installation, it is recommended to verify the sensor operation using a diagnostic scan tool. Turn the ignition switch to ON and adjust the throttle position sensor to the proper position to allow the voltage signal to the ECM to be within specification. Check that the throttle position readings are smooth and consistent throughout the full range of throttle movement and that the warning light is no longer illuminated.

Be aware that the MD614405 can be significantly more expensive than later model TPS sensors. While alternative part numbers like MD614488 or Hyundai 35102-35500 may be available at lower prices, always verify compatibility before purchasing a substitute. MD614488 is listed as an alternative for MD614405 in some online stores, but it is primarily intended for 1993+ models.

Consider products that come with warranty coverage and technical support. A warranty can provide assurance of product quality and reliability. Many suppliers offer a 12-month warranty on TPS products.

• The sensor is a non-contact Hall-effect type that detects the opening angle of the throttle valve

• The sensor uses Hall-effect elements to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds

• The MD614405 features a 4-wire configuration with an integral Idle Position Switch (IPS)

• The sensor is mounted on the throttle body and provides the ECU with throttle position information

• This sensor is an Original Equipment (OE) number for Mitsubishi 3000GT and Diamante vehicles from the 1991–1992 production period

• CRITICAL: The MD614405 is for 1991–1992 models only. For 1993+ models, use MD614488

• The sensor is supplied as a complete unit—no additional components are required for installation

• Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value