수리 사례

2026. 6. 30. 작업

증상

LTFT and STFT values are off and don't make sense

처리 내용

I think I have an answer But bear in mind that this is my assessment with the limited information at my disposal. I'll walk through my reasoning here. If someone finds a flaw in my logic then I'm all ears. Here is a summary of your data +-------------+-------+-------+-------+-------+ | Condition | LTFT1 | LTFT2 | STFT1 | STFT2 | +-------------+-------+-------+-------+-------+ | Cold start | - 19% | - 11% | --- | --- | +-------------+-------+-------+-------+-------+ | Idle | - 8% | - 2% | 0% | 0% | +-------------+-------+-------+-------+-------+ | < 3500 RPM | - 14% | - 4% | ­­≈ 0% | ≈ 0% | +-------------+-------+-------+-------+-------+ | > 3500 RPM | - 1% | + 1% | + 11% | + 12% | +-------------+-------+-------+-------+-------+ First, let's clear some misconceptions STFT's between two banks are almost identical and are almost always positive, meaning ECU is adjusting for a lean condition Don't take your STFT's to be a measure of system health STFT's are not meant to stay positive