Active Fuel Management (AFM), also known as Cylinder Deactivation, is a technology used by manufacturers like Dodge to boost fuel efficiency. It works by turning off half of the engine’s cylinders when you’re cruising or not demanding much power. While AFM can save you gas, some Dodge owners find the switch between cylinder modes to be jarring or detrimental to performance. If you’re experiencing these issues and want consistent full-cylinder power in your Dodge, disabling AFM is a viable solution. One popular method involves using an OBD2 plug, often in conjunction with a scan tool.
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This article dives into how you can disable AFM in your Dodge using an OBD2 plug and scan tool. We’ll cover why you might want to disable AFM, the steps involved in using a scan tool, and the pros and cons of this approach. We’ll also touch upon dedicated AFM disabler devices that utilize the OBD2 port as a simpler alternative.
Understanding AFM and Why Dodge Owners Disable It
Before we discuss disabling AFM using an OBD2 plug, let’s clarify what AFM is and why some Dodge drivers choose to disable it. AFM is designed to improve fuel economy by deactivating cylinders when your Dodge’s engine is under light load. For instance, while cruising on the highway in your Dodge Ram or Dodge Charger, the system might deactivate cylinders to conserve fuel. This is particularly common in Dodge vehicles equipped with V8 HEMI engines.
However, the transition between V8 and V4 mode (or similar cylinder configurations depending on the engine) can be noticeable. Some Dodge owners report:
- Hesitation or Lag: A slight delay in power delivery when accelerating as the engine switches back to full cylinder operation.
- Jerky Transitions: An uneven or “shuddering” feeling during cylinder activation/deactivation.
- Unwanted Noise: Changes in exhaust note that some find undesirable.
- Long-Term Reliability Concerns: While debated, some worry about uneven wear on engine components due to AFM.
For Dodge enthusiasts prioritizing consistent performance and a smoother driving experience, disabling AFM can eliminate these concerns and ensure the engine operates on all cylinders at all times. Using an OBD2 plug and scan tool is one way to achieve this.
Disabling Dodge AFM with an OBD2 Scan Tool: A Step-by-Step Guide
An OBD2 (On-Board Diagnostics II) scan tool is a device that connects to your Dodge’s computer system via the OBD2 port. This port is typically located beneath the dashboard on the driver’s side. Advanced scan tools allow you to access and modify various engine control module (ECM) settings, including AFM.
Here’s how to disable AFM in your Dodge using a scan tool and OBD2 plug:
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Choose a Compatible OBD2 Scan Tool: Not all scan tools have the capability to modify vehicle settings. You’ll need a scan tool that specifically supports reprogramming and allows AFM disablement. Popular options compatible with Dodge vehicles include:
- DiabloSport Tuners: Known for performance tuning and AFM disabling features for Dodge, Chrysler, and Jeep vehicles.
- HP Tuners: A professional-grade tool offering extensive customization, including AFM control for a wide range of vehicles, including Dodge.
- SCT Performance Programmers: Another reputable brand offering tuning and AFM disablement for Ford, GM, and Chrysler/Dodge vehicles.
- Edge Products: Offers monitors and programmers with AFM disable capabilities for select Dodge models.
Ensure the scan tool you choose is compatible with your specific Dodge model and year.
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Connect the OBD2 Plug Scan Tool to Your Dodge: Locate the OBD2 port in your Dodge. With the ignition off, plug the scan tool securely into the port.
OBD2 Port Location in a Vehicle -
Navigate to AFM Settings: Turn the ignition to the “ON” position (engine off). Power on the scan tool and follow the on-screen prompts. Navigate through the tool’s menu to find engine management or ECM settings. Look for options related to:
- Active Fuel Management
- Cylinder Deactivation
- Fuel Saver Mode
The exact menu names may vary depending on your scan tool brand and Dodge model. Refer to your scan tool’s user manual for specific navigation instructions.
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Disable AFM: Once you locate the AFM settings, use the scan tool’s interface to disable the system. This usually involves selecting a “Disable” or “Off” option. The scan tool will then communicate with your Dodge’s ECM to deactivate the AFM function.
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Save and Exit: After disabling AFM, follow the scan tool’s prompts to save the changes to your Dodge’s ECM. Properly exit the scan tool software and disconnect the OBD2 plug from your vehicle.
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Test Drive: Start your Dodge and take it for a test drive. You should notice that the engine now operates consistently on all cylinders. The transitions associated with AFM should be eliminated, resulting in a smoother and potentially more responsive driving experience.
Advantages of Disabling AFM via OBD2 Scan Tool
- Full-Time V8 (or Full Cylinder) Power: Enjoy consistent power delivery and throttle response in your Dodge, free from AFM transitions.
- Enhanced Driving Experience: Eliminate the hesitation, jerky transitions, and unwanted noises associated with AFM, leading to a smoother and more enjoyable drive.
- Customization and Control: Advanced scan tools often offer a wide range of tuning options beyond AFM disablement. You can potentially adjust other engine parameters to further optimize performance and customize your Dodge’s driving characteristics.
- Reversibility: Disabling AFM with a scan tool is generally reversible. You can typically re-enable AFM if desired by using the scan tool to revert the settings.
Potential Drawbacks of OBD2 Scan Tool AFM Disablement
- Reduced Fuel Economy: Disabling AFM means your Dodge will always run on all cylinders, potentially leading to a decrease in fuel efficiency, especially during highway cruising.
- Warranty Implications: Modifying your Dodge’s ECM settings, even through an OBD2 port, could potentially void parts of your vehicle’s warranty. Consult your Dodge dealership and warranty documentation before making any modifications.
- Scan Tool Cost and Learning Curve: High-quality scan tools capable of ECM modification can be an investment. Using them effectively may also require some technical understanding or learning.
- Not Plug-and-Play Simple: While using an OBD2 plug is involved, the process requires navigating menus and understanding scan tool operations, which may be more complex than simpler plug-and-play AFM disablers.
Simpler Alternative: Dedicated AFM Disabler OBD2 Plugs for Dodge
If you seek a more straightforward solution to disable AFM in your Dodge without the complexities of a scan tool, consider dedicated AFM disabler devices that utilize an OBD2 plug. These devices are designed specifically to plug into your Dodge’s OBD2 port and immediately disable AFM without requiring any programming or complex steps.
Popular OBD2 plug AFM disablers include:
- Range Technology AFM/DFM Disabler: A well-known and widely used option that plugs into the OBD2 port and instantly disables AFM in compatible Dodge, GM, and Chevrolet vehicles.
- DFM Tuner AFM Disabler: Another plug-and-play device designed to disable AFM (and DFM in newer models) simply by plugging into the OBD2 port.
- Pulsar LT by DiabloSport: While technically a tuner, the Pulsar LT offers AFM disablement in a simpler, OBD2 plug-in format with some additional features.
These devices offer a hassle-free way to disable AFM. They are generally easy to install and remove, making them a convenient option for Dodge owners who want to eliminate AFM without advanced tools or programming.
For a detailed comparison of top AFM disablers, including plug-and-play OBD2 options, refer to expert reviews and comparisons online.
Choosing the Right AFM Disablement Method for Your Dodge
The best method for disabling AFM in your Dodge depends on your individual needs and preferences.
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OBD2 Scan Tool: Choose this method if you:
- Want comprehensive control over your Dodge’s settings and potential for further performance tuning.
- Are comfortable with using scan tools and navigating software interfaces.
- Desire reversibility and the ability to re-enable AFM if needed.
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Dedicated AFM Disabler OBD2 Plug: Choose this option if you:
- Prefer a simple, plug-and-play solution.
- Want a hassle-free installation and removal process.
- Are primarily focused on disabling AFM without additional tuning features.
Conclusion: Reclaim Your Dodge’s Performance by Disabling AFM via OBD2
Disabling AFM in your Dodge, whether through an OBD2 scan tool or a dedicated OBD2 plug disabler, can significantly alter your driving experience. By ensuring your engine consistently operates on all cylinders, you can unlock smoother performance and eliminate the drawbacks associated with cylinder deactivation.
Carefully weigh the pros and cons of each method, considering your technical comfort level, budget, and desired level of customization. Whether you opt for the advanced control of a scan tool or the simplicity of a plug-and-play disabler, addressing AFM can help you maximize your enjoyment and satisfaction with your Dodge vehicle.
