October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
Total Fuel Trim
The scan tool displays a positive or negative percentage. The value of the Total Fuel Trim is obtained by putting values of Short Term FT and Long Term FT together. The Total Fuel Trim value indicates how much correction is necessary to keep the
air/fuel mixture at stoichiometrical 14.7:1 ratio.