johnmaster
June 23rd, 2011, 03:09 AM
Wondering what to do here. I installed a 0-5v GM tps on my 99 GM truck. It is not the one made for the vehicle but it should work as far as I can tell, I dont have the stock throttle body on there anymore so the stock one will not work.
I want to figure out how to get the pcm to know where 0 and 100 percent throttle are.
I have read the tps reset instructions regarding "pull the tps connector and wait so many seconds etc" but I have not done that yet because I want to understand how/why it can figure out 100% if there is no instruction for telling it what voltage 100% is at.
The stock one I measured on the bench with a 5.1V power supply and I got roughly 1.8V at closed throttle and 4.19 at wot. I tried to install the new one at 1.8V at closed throttle to keep from having to change anything else and not only was I out of travel on my bracket long before that, 1.8V way way far into the travel range of the new one. Aside from that, .8v or so was already showing roughly 10% throttle position. Instead of setting it by voltage I just backed it off until the scantool read 0% and carefully tightened it so a hair touch of the pedal would make the tps move. This was great except now my max wot is something like 75%.
I have some travel left in the zero direction that i can back it off more. Do I have to back it off some, guess, do a relearn and see where the new wot comes in at?
Any help is appreciated.
I want to figure out how to get the pcm to know where 0 and 100 percent throttle are.
I have read the tps reset instructions regarding "pull the tps connector and wait so many seconds etc" but I have not done that yet because I want to understand how/why it can figure out 100% if there is no instruction for telling it what voltage 100% is at.
The stock one I measured on the bench with a 5.1V power supply and I got roughly 1.8V at closed throttle and 4.19 at wot. I tried to install the new one at 1.8V at closed throttle to keep from having to change anything else and not only was I out of travel on my bracket long before that, 1.8V way way far into the travel range of the new one. Aside from that, .8v or so was already showing roughly 10% throttle position. Instead of setting it by voltage I just backed it off until the scantool read 0% and carefully tightened it so a hair touch of the pedal would make the tps move. This was great except now my max wot is something like 75%.
I have some travel left in the zero direction that i can back it off more. Do I have to back it off some, guess, do a relearn and see where the new wot comes in at?
Any help is appreciated.