What is TVA Removal? TVA Removal software

TVA Removal Using ECU Remapping

The Throttle Valve Actuator (TVA) in diesel engines manages airflow to optimize performance and emissions. However, issues with the TVA can lead to reduced engine efficiency and increased maintenance costs. Through ECU remapping, it's possible to deactivate the TVA function, enhancing engine reliability and performance. In this article, we'll explore the process and benefits of TVA removal via ECU tuning, providing insights into how this modification can improve your diesel engine's operation.

What is TVA?

TVA (Throttle Valve Actuator) in diesel engines is a component that controls the throttle valve, regulating airflow into the engine. Unlike petrol engines, diesel engines don’t need a throttle for normal operation, but the TVA is used to manage emissions, improve engine shutdown smoothness, and assist in exhaust gas recirculation (EGR). The TVA can help reduce NOx emissions by controlling air intake, creating the right conditions for better EGR function. However, over time, the TVA can malfunction, leading to performance issues or DTCs. Many tuners remove or disable the TVA through ECU remapping to improve reliability and airflow.

Why was TVA added into diesel engines?

It was added to improve emissions control, enhance engine braking, and provide smoother operation. Unlike petrol engines that rely on air, diesel ones traditionally rely on fuel quantity to control power, so they don’t even need a throttle body to regulate airflow.

Different Types of Throttle bodies:

Even though all throttle bodies have the same principle of operation, we can say that throttle bodies are separated into two groups:

Mechanical

Electronic

Mechanical throttle bodies are found in older and classic cars, directly connected to the gas pedal by a cable. The ECU measures fuel injection and air-to-fuel ratio using the throttle angle, air temp, and pressure sensors. A stepper motor controls airflow at idle by using a bypass, ensuring smooth engine operation. Some throttle bodies have heating elements to prevent freezing in cold weather. Older types use physical levers or are part of carburetors, regulating fuel and air intake based on throttle position.

The electronic throttle control system works similarly to a mechanical throttle body but uses a servo motor instead of a cable. Unlike mechanical systems, it doesn’t need an auxiliary channel for low RPMs; everything is managed by the throttle control. The ECU oversees the entire process, using a potentiometer to adjust the valve angle based on input data. In short, the ECU fully controls and regulates the electronic throttle.

Advantages of Electronic Throttle Bodies Over Mechanical Ones:

• More reliable with fewer failures.
• Requires less maintenance.
• Reduced risk of stepper motor and sensor issues, minimizing high idle RPM.
• Provides more accurate air intake and AFR (Air-Fuel Ratio) control.
• Generates lower emissions, improving environmental performance.

Why is TVA removed?

TVA removal involves disabling the throttle valve in diesel engines through ECU tuning. By deleting the TVA, tuners aim to improve airflow, reduce restrictions, and enhance engine performance, particularly in modified or high-performance setups. TVA removal can also prevent potential failures or malfunctions in the throttle valve system, which may lead to reduced power or engine issues. This process is commonly used in conjunction with DPF (Diesel Particulate Filter) and EGR (Exhaust Gas Recirculation) deletes for maximum performance gains.

DTC Codes Related to TVA:

TVA removal is often performed to address specific DTCs (Diagnostic Trouble Codes) that indicate throttle system malfunctions. For instance, DTC 126A00, commonly found in Mercedes-Benz vehicles, is associated with TVA malfunctions and can result in a check engine light and reduced engine power. Resolving this issue often requires disabling the TVA function via ECU remapping, which eliminates the fault code and restores optimal performance. On the other hand, DTC P2620 is frequently encountered in BMW vehicles. This DTC, which refers to a "Throttle Position Output Circuit/Open," indicates that the Engine Control Module (ECM) has detected an open circuit in the throttle position sensor. This can lead to reduced engine performance, as the ECM cannot accurately determine the closed throttle position. By removing the TVA and recalibrating the ECU, this fault can be effectively cleared, improving both performance and drivability.

Addressing these DTCs through TVA removal not only resolves these recurring fault alerts but can also include additional tuning, such as a Stage1 remap, for enhanced vehicle performance.

Common Symptoms of TVA Malfunction

1. Loss of Power
2. Hesitation During Acceleration
3. Increased Fuel Consumption
4. Recurring Fault Codes and Check Engine Light
5. Rough or Unstable Idle
6. Engine Stalling
7. Black Smoke from the Exhaust
8. Noise or Vibration from the TVA
9. Difficulty with Engine Shutdown
10. Reduced Turbocharger Performance

All of these problems can be fixed for good with a proper ECU remapping

How to delete TVA from a diesel engine through ECU remapping?

The goal is to make the throttle stay open at all times which results in the ECU controlling the engine’s combustion solely with fuel. This is done in 3 steps:

1. Reading the ECU file Using a programmer like KESS3, CMD Flash or Autotuner

2. Locating the TVA maps inside software like WinOLS

3. Writing the remapped file back on the ECU and testing the car

First the file is read using a programmer suited for the ECU through either OBD or on bench. After you have the original ECU file, you need to be able to remap it inside WinOLS which is impossible to do if you’re a beginner. Working with a software like WinOLS is challenging since you need to identify the TVA maps and modify them correctly. Doing that is no easy thing to do, you need a deep understanding about ECU tuning and experience working with WinOLS. In order to reach that level you need genuine training. We at NinjaRemap have over a decade of experience remapping ECUs. If you’re a DIY person and want to tune your own car, you can also send your original ECU file to our ECU Remapping service, our technicians will send you the remapped file in the shortest time.

Which vehicles and ECUs require TVA removal?

We need to check the original file of your vehicle to provide a more accurate opinion, but generally, based on our experience, TVA removal is possible on brands like VAG group, BMW, Mercedes Benz, Ford, Alpha Romeo, Iveco, Nissan, Opel and some others and also ECUs like Siemens (SID Series), Bosch EDC15, EDC16, EDC17 and etc, Delphi (DCM Series) and some other ECUs.   

Potential Risks and Considerations of TVA Removal:

1. In certain vehicle models, simply removing the TVA may trigger error codes. We can address this issue using a diagnostic programmer or by remapping the ECU to properly execute the TVA removal process. A proper remap combined with TVA removal can significantly enhance your vehicle's performance.
2. Deleting the TVA may affect the vehicle's emissions control systems, which can lead to higher pollutant output. This modification may not be legal in certain jurisdictions due to emissions regulations.
3. Ensure that the modification is compliant with local laws and regulations. In some regions, tampering with emissions systems (including throttle valves) can lead to fines, vehicle inspection failures, or voided warranties.

 

The best way to contact us and get answers to your questions is via WhatsApp +44 781 8419 058 and email info@ninjaremap.com