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#1 |
Registered User
Join Date: May 2009
Location: Houston, TX
Posts: 155
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tps and app question HELP!!! im confused
are the readings for the TPS-throttle postion sensor and the APP-accelerator pedal position sensor, should they be similar at all times??
my 07 tahoe 5.3L, got a code and check engine light is on, so i hookd up the ethos scan tool and i got code for tps and or app. so i monitored the readings for both. truck is drive by wire. i noticed that the APP reading changes accordingly as i press and release the gas pedal, from 0 to 100% on the other hand the TPS reading stays at 25% and when i press the gas pedal it goes accordingly up to 100%. tps lowest reading is 25% and sometimes 18%. at idle tps lowest reading with the truck off is 23%. shouldnt my tps reading move according to my gas pedal from 0% to 100%?? im thinking the TPS is bad, but then again im also thinking shouldnt it be over 0% at the tps cuz otherwize it wouldnt stay on at idle, am i right or am i just thinkin too much into this?? im usually hiding out int he squarebody section. LOL ![]() |
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#2 |
Registered User
![]() Join Date: Jan 2003
Location: Denison, Texas
Posts: 1,919
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Re: tps and app question HELP!!! im confused
I believe your tps should go to 0. The IAC is what controls the idle, not the throttle. My 98 shows 0 when idling and I believe my mom's 04 does also and it is also DBW.
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1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F |
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#3 |
Registered User
Join Date: May 2009
Location: Houston, TX
Posts: 155
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Re: tps and app question HELP!!! im confused
thanks bwood, i had forgot about the iac valve, i might stop by a shop to double check. thanks.
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#4 |
its just $$$$$
Join Date: Jul 2003
Location: OK
Posts: 2,078
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Re: tps and app question HELP!!! im confused
I had the same problem on my wifes tahoe recently. I cleaned the throttle body and the plug, as well as cleaned the battery cable which had some corrosion. It hasnt done it since. (knocks on wood)
![]() Mine actually went into limp mode in the middle of traffic on the interstate..I wasnt happy. I'd take a drive by cable system any day over the drive by wire |
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#5 |
Registered User
Join Date: May 2009
Location: Houston, TX
Posts: 155
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Re: tps and app question HELP!!! im confused
bagged74- thanks, i did the same, disconnected the battery and cleaned the throttle body, i noticed that the wing was almost half open, i dont know if that should be like that, but after cleaning and hooking everything back up, i erased the code, and it hasnt came back up yet, drove from houston to san antonio and back and no code. so far so good. thanks.
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