resetting the throttle position sensor?
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Veteran
Joined: Dec 2009
Posts: 304
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From: The Styx,Arizona
resetting the throttle position sensor?
found this write up just not sure about it has anyone ever hear of this or done it?
The TPS is on the drivers side of the throttle body (if you have the stock airbox, you may have to remove it).
then, take a digital voltmeter and stick the positive tester into the back of the plug at the Black/Orange wire...then, put the negative in the back of the black/blue wire.
With the key on, engine off, throttle closed, you should see anywhere from .5 - 1.5 volts. You want it to be as close to 1 as possible. Then, open it to full throttle, it should climb to anywhere between 3.5 - 4.5 volts.
Now, to adjust it, loosen the two bolts (do not remove them), and slowly move the TPS (spinning it) in either direction (one way will raise the voltage, the other will lower it) watching the voltage at closed throttle. As I said, get it as close to 1 volt as possible. (mine only went to .7 volts, so...you may not necessarily reach 1) Tighten it up, (not too tight, remember your bolting this to aluminum). Open the throttle fully and see what the voltage goes too...as I said, as close to 4 volts as possible is best.
Now...put her back together and let her rip
The TPS is on the drivers side of the throttle body (if you have the stock airbox, you may have to remove it).
then, take a digital voltmeter and stick the positive tester into the back of the plug at the Black/Orange wire...then, put the negative in the back of the black/blue wire.
With the key on, engine off, throttle closed, you should see anywhere from .5 - 1.5 volts. You want it to be as close to 1 as possible. Then, open it to full throttle, it should climb to anywhere between 3.5 - 4.5 volts.
Now, to adjust it, loosen the two bolts (do not remove them), and slowly move the TPS (spinning it) in either direction (one way will raise the voltage, the other will lower it) watching the voltage at closed throttle. As I said, get it as close to 1 volt as possible. (mine only went to .7 volts, so...you may not necessarily reach 1) Tighten it up, (not too tight, remember your bolting this to aluminum). Open the throttle fully and see what the voltage goes too...as I said, as close to 4 volts as possible is best.
Now...put her back together and let her rip
Captain
Joined: Feb 2010
Posts: 574
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From: Southern, Alberta
I could be wrong but I think on ours you adjust it by just pressing the pedal to the floor and then release it very slowly until its all the way back-up. It's on here somewhere and is talked about frequently. Good info for the 5.9 Guys for sure.
Professional
Joined: Mar 2010
Posts: 107
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From: Chesapeake, VA
Setting the TPS the way you describe is definitely the correct method and is the way the techs do it, but there is another method that works just fine.
Put the new TPS on and center up the bolt holes on each side. Don't tighten the bolts but have them snug enough to hold the TPS in place. Connect the wiring harness (always good idea to have battery disconnected for this step). Start the truck and let it warm up. Check the idle (I believe our trucks are supposed to be 700-800 rpm, rec double check this number). If not idling in this range, rotate the TPS slightly to adjust RPM to correct range then tighten bolts. You'll need a second person to call out RPMs as you turn the TPS. If you've ever adjusted timing on a distributor engine then it is same process, just using RPM vice a timing light.
Put the new TPS on and center up the bolt holes on each side. Don't tighten the bolts but have them snug enough to hold the TPS in place. Connect the wiring harness (always good idea to have battery disconnected for this step). Start the truck and let it warm up. Check the idle (I believe our trucks are supposed to be 700-800 rpm, rec double check this number). If not idling in this range, rotate the TPS slightly to adjust RPM to correct range then tighten bolts. You'll need a second person to call out RPMs as you turn the TPS. If you've ever adjusted timing on a distributor engine then it is same process, just using RPM vice a timing light.