LAUNCH                                                                 
CReader Series English User’s Manual
 
7 
RPM, vehicle speed, air flow, engine load, fuel pressure, fuel trim value, engine 
coolant temperature, ignition timing advance, or closed loop status.
 
Fuel Trim (FT) -- Feedback adjustments to the base fuel schedule. Short-term fuel 
trim refers to dynamic or instantaneous adjustments. Long-term fuel trim refers to 
much more gradual adjustments to the fuel calibration schedule than short-term 
trim  adjustments.  These  long-term  adjustments  compensate  for  vehicle 
differences and gradual changes that occur over time.