Genuine Mercedes-Benz Throttle Body User Manual

1. Introduction

This manual provides essential information for the Genuine Mercedes-Benz Throttle Body, part number 112-141-01-25. It covers product overview, compatibility, installation guidelines, operational principles, maintenance, troubleshooting, and technical specifications. Understanding this information is crucial for proper function and longevity of the component.

2. Safety Information

Always prioritize safety when working with automotive components. Improper installation or handling can lead to vehicle damage, personal injury, or system malfunction.

• Ensure the vehicle's ignition is off and the battery is disconnected before beginning any work.
• Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
• Refer to the vehicle's specific service manual for detailed instructions and torque specifications.
• If you are not confident in performing the installation, seek assistance from a qualified automotive technician.
• Keep the throttle body clean and free from contaminants during handling and installation.

3. Product Overview

The throttle body is a critical component of your vehicle's fuel injection system, regulating the amount of air entering the engine. This Genuine Mercedes-Benz part ensures precise air-fuel mixture control for optimal engine performance and efficiency.

Figure 3.1: Front view of the Mercedes-Benz Throttle Body 112-141-01-25, showing the main air intake opening and butterfly valve.

This throttle body is designed as a direct replacement for specific Mercedes-Benz models, ensuring compatibility and maintaining original equipment manufacturer (OEM) standards. It features a robust construction with copper and brass contact materials, and operates in a manual mode, controlled electronically by the vehicle's engine control unit (ECU).

Figure 3.2: Side view of the throttle body, highlighting the electronic actuator responsible for controlling the butterfly valve position.

4. Compatibility and Fitment

This Genuine Mercedes-Benz Throttle Body (part number 112-141-01-25) is a direct replacement part. Verify compatibility with your vehicle's make, model, and year before installation.

Compatible Mercedes-Benz Models and Years:

• Make: Mercedes-Benz
• Models: S350, C240, C320, CLK320, E320, ML350, SLK32 AMG, SLK320, ML320
• Years: 2001, 2002, 2003, 2004, 2005, 2006

Always cross-reference the part number with your vehicle's existing part or consult a Mercedes-Benz dealership or certified mechanic to confirm fitment.

5. Installation Guidelines

Installation of the throttle body requires mechanical expertise and specific tools. It is highly recommended that this procedure be performed by a certified automotive technician to ensure correct installation and prevent damage to the vehicle or the component.

General Steps (for reference only):

1. Preparation: Disconnect the vehicle's battery. Allow the engine to cool completely.
2. Access: Locate the throttle body, typically situated between the air intake hose and the intake manifold. Remove any obstructing components (e.g., air intake ducting).
3. Disconnection: Carefully disconnect the electrical connector(s) and any vacuum lines or coolant hoses attached to the throttle body.
4. Removal: Unbolt the old throttle body from the intake manifold. Ensure no debris falls into the intake.
5. Gasket Replacement: Always use a new gasket when installing a new throttle body to ensure a proper seal.
6. Installation of New Throttle Body: Position the new throttle body with the new gasket. Secure it with bolts, tightening to the manufacturer's specified torque.
7. Reconnection: Reconnect all electrical connectors, vacuum lines, and coolant hoses. Ensure all connections are secure.
8. Final Checks: Reconnect the battery. Start the engine and check for proper operation, leaks, or error codes. The vehicle's ECU may need to relearn the throttle body's parameters; follow manufacturer's procedures for throttle body adaptation if necessary.

Figure 5.1: Rear view of the throttle body, illustrating the electrical connector port for integration with the vehicle's wiring harness.

6. Operating Principles

The throttle body's primary function is to control the airflow into the engine's intake manifold. When the accelerator pedal is pressed, a signal is sent to the vehicle's Engine Control Unit (ECU). The ECU then commands the throttle body's electronic actuator to open or close the butterfly valve, regulating the amount of air entering the engine. This precise control is essential for maintaining the correct air-fuel ratio, which impacts engine power, fuel efficiency, and emissions.

Figure 6.1: Frontal view of the throttle body, showing the butterfly valve in a partially open position, allowing air to pass through.

7. Maintenance

Regular maintenance of the throttle body can help ensure optimal engine performance. Over time, carbon deposits and grime can accumulate on the butterfly valve and the interior of the throttle body, impeding its smooth operation.

Cleaning Recommendations:

• Frequency: Consult your vehicle's service manual for recommended cleaning intervals, typically every 30,000 to 60,000 miles.
• Procedure:
  1. Disconnect the battery and remove the air intake hose connected to the throttle body.
  2. Using a throttle body cleaner (specifically designed for electronic throttle bodies) and a clean, lint-free cloth, gently clean the butterfly valve and the inner bore of the throttle body. Avoid harsh scrubbing or forcing the valve open manually if it's electronically controlled.
  3. Allow the cleaner to evaporate completely before reassembling the air intake hose and reconnecting the battery.
• Professional Service: For thorough cleaning or if significant deposits are present, professional service is recommended.

Figure 7.1: Top-down view illustrating the internal bore of the throttle body, where carbon deposits can accumulate.

8. Troubleshooting

If you experience issues after installation or during normal operation, consult this section. Many issues related to the throttle body can manifest as drivability problems.

If troubleshooting steps do not resolve the issue, it is advisable to consult a qualified Mercedes-Benz service center or an experienced automotive technician for further diagnosis and repair.

9. Specifications

The following are the technical specifications for the Genuine Mercedes-Benz Throttle Body 112-141-01-25:

10. Warranty and Support

This Genuine Mercedes-Benz Throttle Body comes with a manufacturer's warranty.

• Warranty Period: 1 Year (as per product description).
• Coverage: The warranty typically covers defects in materials and workmanship under normal use. It does not cover damage due to improper installation, misuse, accident, or unauthorized modifications.
• Claim Process: For warranty claims or technical support, please contact your authorized Mercedes-Benz dealership or the original point of purchase. Provide your proof of purchase and the part number.

For additional support or inquiries, refer to the official Mercedes-Benz service resources or visit their brand store on Amazon.