Long term fuel trim, Bank 2
It is not adjustable. Only the ECM can change it.
The control module receives information from the heated oxygen sensor (HO2S) about the fuel/air mixture when idling at both the lower and upper part-load range - If the fuel/air mixture deviates from [lambda]=1 the short-term fuel trim will compensate for this by adjusting injection time so that [lambda]=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. Diagnostic trouble code (DTC) ECM-261A will be stored when the long-term trim must be adjusted to maximum in the lower part of the load area.
The Engine Control Module (ECM) in a 2001 VW Beetle adjusts long-term fuel trim based on the data it collects from various sensors, such as the oxygen sensor and mass airflow sensor. If the ECM detects a consistent deviation from the ideal air-fuel mixture, it modifies the long-term fuel trim to compensate for this imbalance, helping to optimize engine performance and emissions over time. This adjustment ensures that the engine runs efficiently under varying conditions and helps in maintaining fuel economy. If there are persistent issues, the long-term trim can indicate underlying problems, such as vacuum leaks or faulty sensors.
a boating term
I believe you may be referring to Mode 1 PID 6. "shrft1" would be an abbreviation used by the software running on your scan tool or computer presumably to deal with limited area on the display. Mode 1 PID 6 is commonly known as Short term fuel trim bank one. The short term trim indicates how much (as a percentage) the computer is enriching (positive values) or enleaning (negative values) the commanded fuel relative to how much it has recently (long term trim) needed in similar operating conditions.
A negative LTFT (long term fuel trim) value indicates that the engine is running rich, meaning there is an excess of fuel in the air-fuel mixture. This could be caused by issues such as a faulty oxygen sensor, leaky injectors, or a problem with the fuel pressure regulator.
The science of process of distribuiting weights (cargo, fuel, ballast, etc.) to ensure optimum trimming, and adequate stability. On a ship, trim is the difference between the forward draft and the after draft, however, when you refer to "trim and stability", the concept also refers to the concept of list (side to side inclination).
work on kia sportage 's all the time. Never heard of such. I suppose it could be computer fuel monitoring signals in relation to the throttle body sensor output which in turn leans or richens the fuel ingector mixture as you speed up or slow down.But tha is just a guess on my part.
POST CATALYST FUEL TRIM SYS TOO LEAN BANK2
It can be. It can be a reference to sex. It can also mean a haircut, as in "just a trim." The word "trim" means either slim or slender, or to make something thinner or more slender.
Trouble code P1128 means: Long Term Fuel Trim Add. Air. Bank 1 System Too Lean