If you own a flex-fuel Toyota Tundra, you might have encountered hard starting, rough running, poor fuel economy, and a strong fuel smell. These symptoms could indicate a high alcohol fuel density level, even if you haven’t used E85 ethanol gas. A bidirectional scan tool, like the Launch X431 CRP919E, might be the solution you need. This article explores how a bidirectional scan tool helped resolve this issue on a 2013 Tundra and answers the question: do you need a bidirectional scan tool?
Pinpointing the Problem: High Alcohol Fuel Density
A 2013 Toyota Tundra Crewmax with 67,500 miles experienced the aforementioned problems. The root cause was a high alcohol fuel density level, incorrectly indicating E85 usage to the engine control module (ECM). Toyota issued Technical Service Bulletin (TSB) 0166-19 to address this, but dealer repairs were costly and potentially ineffective long-term. A more immediate and affordable solution was needed.
Exploring Solutions: Techstream vs. Bidirectional Scan Tools
Research revealed two main DIY solutions: using a Techstream cable with potentially unlicensed software or a bidirectional scan tool. The Techstream option presented challenges with software functionality and reliability. A more user-friendly and reliable option was a bidirectional scan tool capable of resetting the alcohol fuel density level.
The Solution: Launch X431 CRP919E Bidirectional Scan Tool
After extensive research, the Launch X431 CRP919E emerged as a reasonably priced bidirectional scan tool capable of resetting the alcohol fuel density level. After confirming with the seller, the tool was purchased and used to successfully diagnose and resolve the issue.
How to Reset Alcohol Fuel Density with a Bidirectional Scanner
The process involved updating the Launch X431 CRP919E to access the necessary Toyota-specific functions. The tool then read the alcohol fuel density level, confirming it was at 85%. Using the “Fuel Density Learning Value Reset” function under the ECM/ECT special functions, the level was reset to zero in seconds.
Results and Conclusion: Problem Solved
After the reset, the Tundra started normally, fuel economy improved, and the engine ran smoother. The alcohol percentage level remained at zero. The Launch X431 CRP919E provided a quick, effective, and affordable solution compared to the dealer’s costly repair. This experience highlights the value of owning a bidirectional scan tool for diagnosing and resolving complex vehicle issues, making it a worthwhile investment for DIY car maintenance and repair. If you’re facing similar issues with your flex-fuel vehicle, a bidirectional scan tool might be the answer you’re looking for.
