When Lean DTCs Are Not Set
A lean running condition may manifest in driveability symptoms that have not (or not yet) triggered a DTC. Customer complaints may include symptoms such as decreased fuel economy, lack of power, hesitation on acceleration, backfiring through the intake, overheating, weird smells or other problems. Even though there may be no codes or even pending codes, your scan tool can still point you in the right direction if you see combined fuel trim corrections of more than 10%, whether positive or negative. (In this case, we’d expect them to be positive-i.e., adding fuel-although incorrect subtraction can also result in a lean condition.)
Негізгі бет Toyota Yaris 2021 fuel mileage issue || fuel trim 27 % lean || no check light data analysis
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