Nemesis8

iTrader: (3)

Are the Long Term Fuel Trim values stored in NVRAM or KAM?

Aseras

niether.... you can clear them both and it won't go away....

MazdaManiac

iTrader: (3)

KAM. However, they are set immediately after the first warm-up to values based on the current drive-cycle.
They don't go away because they are always in flux. As more drive cycles go by, they average and won't move as much unless something drastic happens (like a lot more fuel added or a sever knock event).

Nemesis8

iTrader: (3)

Thanks Jeff

Mine are up to 7.2% right now. I have not tried resetting the PCM in awhile. How about removing the negative cable from the battery and pressing the brakes a few times to discharge the remaining charge, will this clear them?

MazdaManiac

iTrader: (3)

That produces funny results sometimes. The PCM seems to hold onto its power for a long time after it is disconnected from the battery.
Best bet is to leave it disconnected for about 1/2 hour and then still do the full KAM reset manually afterward.