Maft Pro open loop

[Sebas]

It's anyone running the maft-pro with SD and open loop setup A pretty common problem running this set up is having the code 21 which throws everything out of whack
The way I have the maft set up. the car runs beautiful on the initial start up ( when cold ). After the car gets up to temperature and I shut it off when I go and restart it runs like shit. I have search everywhere the web on forums
Lots of people had or have this problem
But no one is posting the way to resolve it or how the fixed it. Please help lol

 

[Nick M]

The feedback system isn't really capable of throwing everything (TCCS) out of whack. In fact, the system doesn't really have anything to do with improving hot starts, cold starts, or driving. It keeps the catalyst in the best operating range when in steady cruise.

Good luck on your MAFT-Pro set up. I have no comment about settings.

 

[Bmettie]

During certain hot start conditions the tccs will raise fuel pressure by venting the fpr to atmosphere.

 

[3p141592654]

If code 21 is set the short term fuel trim is set to 100%. That should give good drivability and is equivalent to running open loop.

 

[Sebas]

I'm sorry for the stupid question but. What's short term fuel trim and how do I adjust it ?

 

[Nick M]

I'm sorry for the stupid question but. What's short term fuel trim and how do I adjust it ?

Read the link. You can read all of it, but starting at page 14 explains open loop. The second link is written to OBDII but it that is fuel trim. Toyota just called it something else before being required to standardize terms. GM called it block learn.