tps problems reading 5 volts at idle
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 9,622
Likes: 16
From: absecon nj
tps problems reading 5 volts at idle
on my way home from work last night all of a sudden it dropped down to 500 rpm and started surging blowing black smoke,as i got back on the throttle it acted like tps wasnt even working till i got to half throttle at least.I made it home took a 1/4 tank of gas to get 15 miles,put the scanner on it and it was reading 5 volts at idle,i disconnected it and checked voltage to grey wire 5 volts ,black ground and blue im not sure i forget now,well when i plug it back in i get 4.98-5.00 on the blue and grey.If i disconnect it the scanner will read.004 like normal but it will idle at least and idle higher then normal.I think the tps is shot but now wondering if wiring trouble,im going back outside to check blue again while disconnected.This week i checked it and it was fine .62 at idle and 4.25 wot.
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 9,622
Likes: 16
From: absecon nj
Re: tps problems reading 5 volts at idle (jfb)
ok i can test it off the black and blue with my meter and it reads .004 disconected and the grey is reading 5 volts untill i plug it back in then it goes to 4.98 on the blue.Ill go out and check the black again.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: tps problems reading 5 volts at idle (patsnitrovette)
The ground wire should always read 0 volts. Any voltage read on the ground wire indicates it is open circuit. When the ground wire opens, the ECM gets 5 volts all the time.
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 9,622
Likes: 16
From: absecon nj
Re: tps problems reading 5 volts at idle (jfb)
jfb,ground is reading 0 volts,thanks for the help,so is it indicating bad tps ,cause wheni plug it back in then the blue will read 4.98 to 5.00 volts
[Modified by patsnitrovette, 12:07 PM 7/25/2003]
[Modified by patsnitrovette, 12:07 PM 7/25/2003]
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Re: tps problems reading 5 volts at idle (patsnitrovette)
They are inexpensive.
Replacing it is as good a troubleshooting technique as you'll find.
It's a good idea to have a spare anyway.
Reset it to .54 - .64 volts unless it the "unadjustable" kind.
BTW you CAN replace the nonadjustable ones with the adjustable type.
Replacing it is as good a troubleshooting technique as you'll find.
It's a good idea to have a spare anyway.
Reset it to .54 - .64 volts unless it the "unadjustable" kind.
BTW you CAN replace the nonadjustable ones with the adjustable type.
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 9,622
Likes: 16
From: absecon nj
Re: tps problems reading 5 volts at idle (VetNutJim)
just my luck i went and go a ne wone on the way home and put it on,it wont adjust down below 2.20 the i looked at it,its used,now i go ot go back and get another one,good thing its only 200 ft from my house.At least i know itll fix it now.
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