what does TPS exactly do?
#1
what does TPS/IAC exactly do?
what do they do? sense how much gas is being given, and give gas according to that or something? or something else?
i think MAF tells how much air is comnig, so it gives it that much fuel, so what does the TPS/IAC and the front o2s do?
i think MAF tells how much air is comnig, so it gives it that much fuel, so what does the TPS/IAC and the front o2s do?
Last edited by Seal; 10-12-2003 at 01:47 AM.
#2
TPS is the throttle position sensor. It tells how much throttle is being used. IAC is Idle Air Control, it controls how much air to let in during idle. The front O2 sensors are used during closed loop to let the PCM know how well the air/fuel ratio is and adjust it if necessary.
#5
Originally posted by Seal
so if it goes bad, the TPS might think the throtlle isnt open all the way? and what do you mean closed loop?
so if it goes bad, the TPS might think the throtlle isnt open all the way? and what do you mean closed loop?
#6
Originally posted by Seal
so if it goes bad, the TPS might think the throtlle isnt open all the way? and what do you mean closed loop?
so if it goes bad, the TPS might think the throtlle isnt open all the way? and what do you mean closed loop?
If the TPS goes toes up, the computer is confused (becomes a "confuser"?), and can only guess at the demand for power.
"Closed loop" generally means that O2 sensors feed combustion information back to the computer which adjust spark and fuel to get best emission and maybe fuel economy. It's an in-process, constantly changing situation achieved during normal driving after the engine warms up.
"Open loop" means that preprogrammed fuel and timing maps are used by the computer. This is typical at high throttle openings (WOT), or maximum "demand" as well as startup and warm up.
My $.02
#7
Here is some good info from Injuneer that might help you out.
http://members.aol.com/injuneerzz/scanmast.htm
http://members.aol.com/injuneerzz/scanmast.htm
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