PD38: Front Bank Long Term Fuel Trim

Displayed in counts from zero to 255. Normal count position for long term fuel trim is 128, indicating engine is operating normally. Long term fuel trim value is based on short term learned value, stored in memory blocks of long term according to MAP and RPM values. A count greater than 128 indicates time is being added to injector pulse width, resulting in more fuel to engine. A count of less than 128 indicates time is being subtracted from injector pulse width, resulting in less fuel to engine.