If you own a Toyota Tundra, particularly a Flex Fuel model, you might have encountered hard starting issues, rough idling, poor fuel economy, and a strong fuel smell. These symptoms often point to a high alcohol percentage level in the fuel system, even if you haven’t used E85 ethanol gas. This issue stems from the engine control module (ECM) incorrectly interpreting the fuel composition. While a technical service bulletin (TSB) exists for this problem (T-SB-0166-19), dealer repairs can be expensive and may not offer a permanent solution. Fortunately, a cost-effective and potentially long-term fix involves resetting the alcohol fuel density level. This article explores how a Foxwell NT301 OBD2 code reader can help you perform this reset. We’ll also discuss the symptoms, causes, and potential solutions for this common Tundra issue.
Understanding the Problem: High Alcohol Fuel Density in Toyota Tundras
Flex Fuel vehicles are designed to run on both gasoline and E85 (up to 85% ethanol). The ECM uses sensors to determine the fuel composition and adjust engine parameters accordingly. However, these sensors can sometimes malfunction, leading to an inaccurate reading of the alcohol content. When the ECM believes the fuel contains a higher percentage of ethanol than it actually does, it delivers an overly rich fuel mixture, causing the aforementioned problems.
Resetting Fuel Composition with a Foxwell NT301 OBD2 Scanner
One solution to this problem is to reset the alcohol fuel density level back to zero. While some have attempted this using Techstream cables with potentially unlicensed software, this can be complex and unreliable. A more straightforward approach involves using an OBD2 scanner with specific capabilities, such as the Foxwell NT301. This device offers a “Fuel Density Learning Value Reset” function that can quickly and easily reset the alcohol level.
Using the Foxwell NT301 to perform this reset generally involves the following steps:
- Connect the scanner: Plug the Foxwell NT301 into the vehicle’s OBD2 port.
- Power on the ignition: Turn the ignition key to the “on” position without starting the engine.
- Select the correct vehicle: Navigate through the scanner’s menu to select the correct make, model, and year of your Toyota Tundra.
- Access special functions: Find and select the “Special Functions” menu. This may be located within the “ECM/PCM” or “Engine” section.
- Reset fuel density: Locate and select the “Fuel Density Learning Value Reset” function. Confirm the reset and allow the scanner to complete the process.
Benefits of Using a Foxwell NT301
The Foxwell NT301 provides a user-friendly interface and clear instructions, making it easy to perform the fuel composition reset, even for those with limited experience using OBD2 scanners. This DIY solution eliminates the need for expensive dealer visits and potentially provides a longer-term fix. Furthermore, the Foxwell NT301 functions as a comprehensive diagnostic tool, allowing you to read and clear trouble codes, monitor live data, and perform other vehicle-specific functions. This versatility makes it a valuable tool for any Tundra owner.
Conclusion
A high alcohol fuel density reading can cause significant starting and performance issues in Toyota Tundras. While dealer repairs are an option, using a Foxwell NT301 OBD2 code reader to reset the fuel composition offers a practical and potentially more affordable alternative. This device provides a user-friendly way to address this common problem, restore proper engine function, and improve fuel economy. By investing in a Foxwell NT301, Tundra owners can empower themselves to diagnose and resolve this issue, saving time and money. If you’re experiencing hard starting or related problems in your Tundra, consider using a Foxwell NT301 to reset the fuel density and potentially fix the issue.
