Dupshaw123

So when short term is done adjusting fuel trims is that what is used during most driving. Like let's say around town below 3500rpm.

lobuxracer

iTrader: (2)

ST is never done. It is constantly active during closed loop. When ST makes a persistent move in one direction, LT gets modified. LT is only used in open loop. ST is only used in closed loop. Both are used to modify the base fuel maps provided by Toyota. They are built to compensate for wear and tear, minor vacuum/pressure leaks, manufacturing tolerances, variations in fuel quality, etc. and allow up to +/-20% from the base value. There is a parameter called Vf which is a 0 to 5.0 VDC signal representing where LT is (roughly). Ideally you want Vf to be at 2.5 VDC which means your compensation is in the middle of the range. Monitoring Vf will let you know what the ECM is doing to dial out whatever tune you tried to invoke. This is also one of the biggest challenges to tuning a Toyota ECM with piggybacks. The most successful ones emulate normal behavior while changing the tuning parameters to whatever is actually needed. HKS's F-CON V was the first piggyback to be able to do this, but that unit is way out of date for our engines.

Some of the 2GR-FSE guys are using the MAP ECU with success, but when I looked at it, it didn't have enough channels to run all 16 of our injectors. If there is any hope of a tune, that would be it.

Dupshaw123

So do you think I got check engine the second go around (p0139) because I might have had a bummed learning cycle. Does hitting rev limiter cause that code?

lobuxracer

iTrader: (2)

No. Sounds like an exhaust leak, not rev limiter or "bummed" learning cycle. There is no finish to the learning so it's not a cycle. The ECM is constantly learning and applying feedback based on the sensor inputs - from all the sensors, not just O2.