Ok I have a 97 SC300 that I need to find out at what throttle setting that it changes from closed loop to open loop? I am thinking that it is around 50% I am working a little project on OBDII cars, and any information would be great.

Thanks

 

... what your thottle setting is... Open loop usually becomes closed loop after your engine reaches normal operating temperature... If for some reason your ECT sensor fails then it will automatically go into closed loop after "x" amount of time car is being driven... Hope this helps.. Good luck with the project... Bryan

 

i think alot of people guess on this one, i have my afc set to 69/70

 

I got a tester that shows when the car goes open looped. I am going to do some test and log it. Then I should be able tune around it better.