Practice question

What is the difference between Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT)?

  1. STFT is adjusted by transmission slip solenoids, while LTFT is controlled by the catalytic converter bypass valve
  2. STFT represents immediate fuel mixture adjustments based on oxygen sensor inputs, while LTFT is a learned compensation value stored over time
  3. STFT is active only during wide-open throttle, while LTFT operates only when the engine is idling
  4. STFT measures the fuel volume inside the tank, while LTFT calculates fuel injection rail pressure

Answer: B — STFT represents immediate fuel mixture adjustments based on oxygen sensor inputs, while LTFT is a learned compensation value stored over time

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