TP Sensor Adjustment
Thread Starter
Racer
Joined: Jan 2002
Posts: 341
Likes: 1
From: Cave Creek AZ
TP Sensor Adjustment
I'm going to replace the stock fixed TP sensor with an adjustable one. My shop manual doesn't really give the voltage specs for idle and WOT position. I believe that the TP sensor voltage at idle should be .5 volts and WOT should be 5.0 volts. Can some one give me the actual specs?
Does it make sense to adjust the idle voltage as high as possible within spec so that the computer will see increased voltage sooner?
Thanks for any help. :)
Does it make sense to adjust the idle voltage as high as possible within spec so that the computer will see increased voltage sooner?
Thanks for any help. :)
Team Owner
Joined: Mar 2000
Posts: 83,381
Likes: 87
From: Boston, MA
This is how it works for my L98. :)
Idle = 0.54v
WOT = 5.0v (as long as it is over 4.6 it will work also)
At idle on my L98 I can set the TPS to 0.68v without setting a code. Anything higher than that will set a computer code. It'll bump your idle up by about 100rpm, and give you a very slight edge on response.
Idle = 0.54v
WOT = 5.0v (as long as it is over 4.6 it will work also)
At idle on my L98 I can set the TPS to 0.68v without setting a code. Anything higher than that will set a computer code. It'll bump your idle up by about 100rpm, and give you a very slight edge on response.
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Re: TP Sensor Adjustment (lead_foot)
I put an adjustable one on mine when I replaced the throttle body. I soon found however that it was not the quality of the original. Unless you are having a problem with the stock TPS there is ne need to change it. I just ever so slightly filed out the screw holes with a round bastard file (Ooops I said a naughty word). I was able to get the voltage that worked best for my car. In my case it seems more responsive at .61 volts, according to Diacom and just feel. It also could be that it is at .54 and my DVM is off a little. Try the file method it could save you 40 clams.
I could be wrong though.
[Modified by 90_roadster, 4:59 PM 2/24/2002]
I could be wrong though.
[Modified by 90_roadster, 4:59 PM 2/24/2002]
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: (scorp508)
This is how it works for my L98. :)
Idle = 0.54v
WOT = 5.0v (as long as it is over 4.6 it will work also)
At idle on my L98 I can set the TPS to 0.68v without setting a code. Anything higher than that will set a computer code. It'll bump your idle up by about 100rpm, and give you a very slight edge on response.
Idle = 0.54v
WOT = 5.0v (as long as it is over 4.6 it will work also)
At idle on my L98 I can set the TPS to 0.68v without setting a code. Anything higher than that will set a computer code. It'll bump your idle up by about 100rpm, and give you a very slight edge on response.
You can actually raise the voltage to about .64 before you get a "TPS high voltage" error code. Some run the higher voltage to improve off idle throttle response.
BTW, chances are you won't be able to get 5.0 volts at WOT, but anything above 4.5 volts is fine.
Hope this helps.
Jake
[Modified by JAKE, 5:00 PM 2/24/2002]
Team Owner
Joined: Mar 2000
Posts: 83,381
Likes: 87
From: Boston, MA
Re: (JAKE)
You can actually raise the voltage to about .64 before you get a "TPS high voltage" error code. Some run the higher voltage to improve off idle throttle response.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: (scorp508)
You can actually raise the voltage to about .64 before you get a "TPS high voltage" error code. Some run the higher voltage to improve off idle throttle response.
Hmm... I'm at 0.68v w/no codes.
Hmm... I'm at 0.68v w/no codes.
I just used TPIS' voltage recommendation for the high side to keep guys from getting a code and going into a panic.
Jake
Burning Brakes
Joined: Nov 1999
Posts: 795
Likes: 1
From: South Texas
Re: (JAKE)
"The TP sensor has an auto zeroing feature. If the voltage reading is within the range of about .3 to .9 volt, the PCM will use that value as closed throttle."<----94 Helms
Avg is around .5v to .6v +/-on LT1/4 when u slap a new TPS on, since u cannot adj.
If u can make your 96 LT4 adj...go for it......c how high u can go without setting a code.....good luck
DTC21=TP Sensor signal is greater than 2.5v, engine idling (less than 10 grams per sec of air flow), all conditions met for 5 sec or TP sensor signal voltage over 4.8v with ignition "ON".
DTC22=TP Sensor signal voltage is less then about .23v
[Modified by Dualnic, 10:02 PM 2/24/2002]
Avg is around .5v to .6v +/-on LT1/4 when u slap a new TPS on, since u cannot adj.
If u can make your 96 LT4 adj...go for it......c how high u can go without setting a code.....good luck
DTC21=TP Sensor signal is greater than 2.5v, engine idling (less than 10 grams per sec of air flow), all conditions met for 5 sec or TP sensor signal voltage over 4.8v with ignition "ON".
DTC22=TP Sensor signal voltage is less then about .23v
[Modified by Dualnic, 10:02 PM 2/24/2002]
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: TP Sensor Adjustment (lead_foot)
Thanks everyone for your comments. I had the L98 specs I just didn't know if the anything changed for the LT4.
It's hard to keep up with all the changes GM makes to these engines. On some model years the TPS settings are adjustable and on some they aren't.
Jake