Resetting Long Term Fuel Trims

Long term fuel trim corrections are reset by resetting the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) . After making a fuel system repair, the KAM must be reset. For example, if dirty/plugged injectors cause the engine to run lean and generate rich long term corrections, replacing the injectors and not resetting the KAM will now cause the engine run very rich. The rich correction will eventually be learned out during closed loop operation, but the vehicle may have poor driveability and high CO emissions while it is learning.