finx
Member +
fatman has basically covered it.
as for accuracy the ones used on the e series engines are fairly accurate. i have messed around with one on a oscilloscope which was very interesting and proved they are very reliable.
the tps does however need to be set accurately for it to relay the correct info/voltage output for the butterfly angle which represents engine load.
variable tps sensors on more modern cars with full electronically controlled transmitions are even more accurate. they have to be, as they coupled with the crank angle or cam angle sensors replace the original way of the trans sensing load and car speed via the governor.
any miss calculation of voltage output from here will make the trans shift horribly, to early or late and wear out the internal components very quickly. modern transmitions have different maps depending on load and speed characteristics of what the vehicle is doing at the time. and the tps is effectively the load sensor which feeds the trans ecu info about whats going on so it doesnt overwork the internal components and wear them out prematurely which was a huge problem on some older model automatic 4wd Subaru's when people would tow heavy trailers and boats etc
that should give you some insight anyway even if i have gotten carried away.
cheers
ryan
as for accuracy the ones used on the e series engines are fairly accurate. i have messed around with one on a oscilloscope which was very interesting and proved they are very reliable.
the tps does however need to be set accurately for it to relay the correct info/voltage output for the butterfly angle which represents engine load.
variable tps sensors on more modern cars with full electronically controlled transmitions are even more accurate. they have to be, as they coupled with the crank angle or cam angle sensors replace the original way of the trans sensing load and car speed via the governor.
any miss calculation of voltage output from here will make the trans shift horribly, to early or late and wear out the internal components very quickly. modern transmitions have different maps depending on load and speed characteristics of what the vehicle is doing at the time. and the tps is effectively the load sensor which feeds the trans ecu info about whats going on so it doesnt overwork the internal components and wear them out prematurely which was a huge problem on some older model automatic 4wd Subaru's when people would tow heavy trailers and boats etc
that should give you some insight anyway even if i have gotten carried away.
cheers
ryan
