work in progress

iTrader: (2)

Line pressure is 120 at idle and runs up to 260 then immediately drops back to 120 while still under load. Ran a tech II on it yesterday and MAF, TPS, and all values in transmission look correct. I am freaking pulling my hair out over this any and all help greatly appreciated.

work in progress

iTrader: (2)

I should add that this is going from a stock transmission to a built transmission and FTI 4000. Tuning is still from the stock trans and Yank PT 4000. My thoughts are maybe EPC or a tuning issue. since pressure is based on calculated tq, I am wondering if the computer is commanding the line pressure to be dropped.

jimmyblue

iTrader: (11)

On some tunes you will see, in the Force Motor tables,
that the >96% column reverts to a "blowoff" (full PCS
current) value. Just what you'd need, at WOT.

Now this is blocked by the max line% limit value, in
the stock tune, but some people see this as a good
thing to raise (mobetta) without realizing it will let the
stupid force motor current value be indexed-to.

If you see force motor current swing up to 1000mA
or force motor duty run up when it should have gone
to zero, this is a good place to dig.

work in progress

iTrader: (2)

Awesome, thanks

mrvedit

Remember that high PCS current gives you low pressure. Zero current gives you max pressure.
You really will need to log the PCM's commanded current to see what is going on.