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TPS Problems

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  #1  
Old 05-13-2009, 01:33 PM
B0NECRACKER B0NECRACKER is offline
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Default TPS Problems

I recently changed plugs, plug wires, cap and rotor, and replaced the valve cover gaskets. On my way to work the next morning I threw a P0122 DTC-low tps volt. The truck started bucking after stopping not bad just a little surge. I replaced the TPS and cleared the code 15 min later tripped again. I thought maybe I didn't clean the ground good enough when I replaced the gaskets, cleaned that up cleared the code and reinstalled old TPS. It hasn't thrown the code yet but it surged a little today and probably will soon. Any suggestions would help.
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Last edited by B0NECRACKER; 05-13-2009 at 01:40 PM..
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Old 05-13-2009, 01:52 PM
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i would check your Idle Air Control...it bolts onto the back of your throttle body.....take it off, dont touch it, just spray with cleaner until clean.....and check your wires
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Old 05-13-2009, 02:47 PM
B0NECRACKER B0NECRACKER is offline
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yep thats my next plan of action to go through the other sensors. I was hoping some one else has had the same issues so that I could go to the source without doing a bunch of diagnosis
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Old 05-13-2009, 03:11 PM
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so it was fine before all of this? you might also try the plug wire reroute.....it can give you funky codes....

http://dodgeram.info/tsb/1998/18-48-98/18-48-98.htm
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Old 05-13-2009, 04:50 PM
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I was wondering about plug wires and had planned on trying that re-route. I'm not sure if it was happening before I changed everything. I do recall that it felt like it sputtered one morning so I think that maybe that may have been the first failure but I don't know.
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Old 05-13-2009, 05:12 PM
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Remove the whole TB and sensors and clean it all. And if you bought a cheapo TPS from Autozone or wherever they suck. So don't buy an IAC from there either.
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Old 05-13-2009, 07:02 PM
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i tried to outsmart the pcm one time by ignoring a P0123 tps related code. bad idea, as the pcm is smarter than i am. replacing tps fixed my problem.

check the wiring on the tps plug and harness, make sure you didn't break a wire somewhere along the way.

if you haven't fully reset the pcm, do that. disconnect neg battery and turn ignition to start for 30 sec.

the pcm is unhappy with a low voltage signal from the tps. don't ignore it. probe the tps pins with a volt meter. there is a thread for it... make sure your voltages are as they should be. an old and a new tps throwing the same code is suspicious.
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Old 05-13-2009, 08:41 PM
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I have replaced TPS and it still have the same code P0122 trip. Ill clean everything and let you guys know.
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Old 05-14-2009, 12:20 AM
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anyone know how to check the IAC and MAP sensors
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Old 05-14-2009, 02:05 AM
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iac- unbolt it with it still plugged in and have someone turn the truck on (don't start it, just turn the key to "on") and the pintile should move in and out, if it doesn't it is stuck could try cleaning it with some TB cleaner (unplug it and clean off the truck). don't twist/push/pull the pintile or it will break.

map- if you can get it to idle smooth for a minute, tap it with a screwdriver handle or something else that is hard plastic, but don't tap it hard, just about as hard as you would knock on a door, if its bad then the idle will jump all over the place and it'll seem like the engine is having a seizure.
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Old 05-14-2009, 06:10 AM
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Quote:
Originally Posted by Sheriff420 View Post
iac- unbolt it with it still plugged in and have someone turn the truck on (don't start it, just turn the key to "on") and the pintile should move in and out, if it doesn't it is stuck could try cleaning it with some TB cleaner (unplug it and clean off the truck). don't twist/push/pull the pintile or it will break.
I've read this several times, and it is not true. At least, not for 2001 model years. Not sure who originally stated it.

I've had mine to on, off, on, off, on (literally that many times) at one point, and then another hour or two later tried it again... the old IAC and a brand new one didn't move at all. Once the truck started up with the new IAC, it idled high for a second or two, then dropped steadily down to normal.

If Sheriff's MAP test doesn't give you any results, you may also try using a hand vacuum pump (I think thats what they're called). Look on YouTube for "testing MAP" or "MAP sensor test" and you should be able to easily find how to test it.

Last edited by jasonw; 05-14-2009 at 06:13 AM..
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Old 05-14-2009, 11:22 AM
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gotta call BS on that one. i am right, just research it a little. i wasn't sure how it would move on the last post but i looked it up and found out that it will retract if its good and won't move if its shot. another test you can do is to turn on the ac and if the idle doesn't go up then it needs further testing.

did you get a mopar IAC or and advance or autozone one? for some reason dodges don't like sensors made by anyone other than mopar, and advance and autozone can have a bad one in the box, or sometimes 2 or 3 bad ones in a row. so the reason yours wouldn't move is either that the old and new one are both bad or you have insufficient voltage going to the iac.

turn the ignition on and backprobe your iac with a multimeter on the purple/black wire (+) and the brown/white wire (-) with the meter set on 20v DC. the picture shows the guy testing one wire at a time so i assume he has the negative lead for the meter grounded. don't shove the probes in there too hard, it only takes light pressure to make contact. if you have voltage present then that isn't the issue and you more than likely have a bad IAC. if you don't have voltage then its an electrical issue and i'm not sure how to fix it.
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Last edited by Sheriff420; 05-14-2009 at 11:26 AM..
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Old 05-14-2009, 04:00 PM
B0NECRACKER B0NECRACKER is offline
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OK I have Re-routed the plugs wires, replaced the IAC, TPS and checked the MAP and everything checks out ok cleared the DTC. And Im still havin the same problem and code P0122 still trips.
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Old 05-14-2009, 07:02 PM
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i turned the ignition to "on" one time with the IAC in my hand and the electrical connector plugged in. the iac motor turned and the pintle extended more and more and more...... and then it fell out. LOL
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Old 05-15-2009, 12:47 AM
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OK so I think I figured it out when I replaced the cap and rotor there is a plate underneath the rotor that has a magneto on it that must not have been seated right and that was causing a mis-fire which would trip the TPS to have a low volt. So far no problems but im crossing me fingers.
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Old 05-15-2009, 11:21 AM
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Quote:
Originally Posted by dhvaughan View Post
i turned the ignition to "on" one time with the IAC in my hand and the electrical connector plugged in. the iac motor turned and the pintle extended more and more and more...... and then it fell out. LOL
never hear of that happening, bet it was a surprise since its supposed to retract not extend, guess it was just "turned on" by the voltage and being in your hand.
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Old 05-15-2009, 11:21 AM
 
 
 
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03, 1500, bucking, davidson, daytona, dodge, harley, low, p0123, problems, ram, surging, test, tps, voltage

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