Throttle Body 40SMF1 6400300 For Fiat 1.2L 1.4L 8V FIRE Engines

Throttle Body 40SMF1 6400300 For Fiat 1.2L 1.4L 8V FIRE Engines

1. Vehicle Compatibility Table

This throttle body is primarily compatible with several Fiat models equipped with small-displacement gasoline engines, especially from the mid-to-late 2000s.

Examples of Main Compatible Vehicles:

Note: The list above shows common compatible models. Always verify the exact fit using your VIN or with a professional parts supplier before purchase.

2. Product Features

• OE Number: The original part number is 6400300. The code 40SMF1 is also commonly used in the aftermarket for identification.

• Type: Electronic Throttle Body (Drive-by-Wire / E-Gas).

• Construction: Typically consists of an aluminum housing, a throttle plate, a DC motor, position sensors, and an electrical connector.

• Control Method: Cable-free design. It is directly controlled by the Engine Control Unit (ECU), which sends electronic signals to a motor for precise throttle plate adjustment.

3. Characteristics

• Precise Control: Electronic management allows for high-precision and rapid response in regulating air intake.

• Integrated Sensors: Features built-in dual potentiometer position sensors that provide real-time feedback to the ECU.

• Reliability: As an original equipment part, its design and materials ensure high compatibility with the Fiat vehicle's systems.

• Adaptation & Cleaning: Includes self-adaptation functions to compensate for minor mechanical wear and a self-cleaning cycle (rapidly opening and closing the plate upon ignition to dislodge carbon buildup).

4. Advantages

• Ensures Engine Performance: Guarantees the correct air-fuel mixture for optimized power output and fuel economy.

• Improves Driving Smoothness: Works with the ECU to ensure stable idling and smooth acceleration response.

• Reduces Emissions: Precise air intake control helps the catalytic converter operate efficiently, reducing harmful emissions.

• OE Quality: Using a part with the OE number ensures optimal compatibility and long-term reliability, minimizing potential failure risks.

5. Purpose

• Core Function: To regulate the volume of fresh air entering the engine's combustion chambers. It is a key actuator in the engine management system.

• Applications:

  • Replacement & Repair: Used to replace a faulty throttle body that causes issues like the check engine light, unstable idle, poor acceleration, or high fuel consumption due to severe carbon buildup, motor failure, sensor faults, or mechanical jamming.

  • System Calibration: After replacement, a throttle body adaptation (or initialization) procedure is usually required using a professional diagnostic tool. This allows the ECU to learn the new position parameters of the throttle body.

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