If you own a flex-fuel vehicle, you might encounter hard starting, rough running, and poor fuel economy due to a high alcohol fuel density reading. This issue often stems from the engine control module (ECM) incorrectly interpreting the fuel blend. While a dealer fix is available, it can be costly and may not provide a permanent solution. This article explores using a Bidirectional Scan Tool For Home, specifically the Launch X431 CRP919E, to reset the fuel density level and resolve these problems.
Identifying the Problem and Finding a Solution
A 2013 Toyota Tundra Crewmax with 67,500 miles experienced hard starting, reduced fuel economy, and rough running. The root cause was determined to be a high alcohol fuel density level (85%), causing the ECM to incorrectly assume the vehicle was running on E85. Toyota issued a Technical Service Bulletin (TSB-0166-19) addressing this issue, but the dealer repair cost was $1200 with a long wait time for parts. Furthermore, some owners reported the problem recurring even after the dealer repair.
Alternative solutions included using a Techstream cable with potentially unlicensed software or purchasing a short-term license for the official Toyota Techstream software. However, these options presented challenges with software functionality and cost. A more practical and affordable solution was sought: a bidirectional scan tool for home use capable of resetting the alcohol fuel density level.
The Launch X431 CRP919E: A Bidirectional Scan Tool for Home
After extensive research, the Launch X431 CRP919E emerged as a potential solution. This bidirectional scan tool for home offered the capability to reset the fuel density level at a reasonable price. Before purchasing, the seller confirmed the tool’s compatibility with the Tundra. Upon receiving the Launch X431 CRP919E, all available updates, including Special Functions for Toyota, were installed.
Resetting the Fuel Density Level
The tool successfully read the alcohol fuel density level, confirming the 85% reading. Using the following steps, the fuel density was reset to zero:
- Diagnose: Access the diagnostic menu.
- System Selection: Choose “Toyota.”
- ECM/ECT Selection: Select “ECM-ECT (engine).”
- Special Functions: Navigate to the special functions menu.
- Fuel Density Learning Value Reset: Execute the reset function.
The reset process took approximately three seconds.
Results and Conclusion
After resetting the fuel density level, the Tundra started without issue, fuel economy improved, and the engine ran smoother. The alcohol percentage level remained at zero after multiple checks. The Launch X431 CRP919E provided a quick, effective, and affordable solution to a potentially costly and recurring problem. This bidirectional scan tool for home use offers a valuable alternative to dealer repairs and empowers vehicle owners to address common issues themselves. The Launch X431 CRP919E can also be utilized for other vehicle makes and models, extending its usefulness beyond this specific application.
