I've read on various sites about codes 21 & 22 (which my GTA is throwing )
There seems to be a different deffinition for each site.
All of which seem to agree with the fact that the TPS is mucking up somewhere.

What's the deal?
I KNOW my revvs are high when in park and neutral (they gradually climb to 1400 then plateau according to my stock tach)
In any gear other than that they sit around 700.

If anyone can tell me how to remedy this, would i be able to do the install myself? I'm mechanically inept.

 

I would take it to the daler and tell them to check the functionality of your TPS sensor.

 

The last thing i'd do is take my car to a dealer.

Why? So i can pay to have it "diagnosed"
Pay to have the part installed at an insane rate
And pay three times the normal price for a part.

 

well... its much easier for them to diagnose, since they just have to plug in the computer and press the pedal and read the voltage. They don't HAVE to install it, you can do that.

Or, if you have access to a a few jumper wires with alligator clips attached, you can plug them into your harness then to your TPS, then measure the voltage between the 2 wires (I am not sure which ones, I can check in my manual, its at the garage.)... what you look for is:

1) Base Voltage should be between .5 and .6 Volts
2) Any dead/flat spots in the TPS when you slowly press and release the throttle.
3) Voltage should be 4V at WOT.

 

Thanks a bunch nblanch

 

Have you tried replacing the TPS? The other alternative is possibly something in the wiring/harness. Go with the easy fix first if you haven't replaced the TPS yet.

 

Glenn, I'm in Greece right now and My car is Calgary, I'll try that in a Week when i try and start it up.
Keyword here TRY

 

I'm glad this came up. I have recently been getting code 21 when i go racing. TPS voltage too high. (Havn't set the TPS in a long while.)
Now i set it for .54 at idle, but couldn't remember what it should be at WOT.
It was reading 4.9 volts at WOT, which I'm pretty sure is too much, hence the code.
So i now have it set to 4.6 volts at WOT. Is this good? I can't remember what the minimum is for WOT signal. I thought it needed to be alot higher than 4 volts.
Pass along the good word.
thanx

 

This modifying the TPS setting to get "Max voltage" is a bunch of hogwash. What you need to do is set the TPS for the proper idle and then control the TPS setting of where it engages PE inside the eprom.

There is a table inside the eprom where you set the minimium TPS setting for various RPM levels to engage PE (WOT). Having any additional voltage once PE is engaged does absolutiely nothing.

Hopefully this "adjusting the TPS for max voltage" modification will stop now that people know the PROPER WAY to engage PE sooner. Adjusting the TPS is NOT the way to do it.

Get it idling properly, and then modify the TPS setting inside the eprom if you want PE to engage sooner.

 

Hey chill out Glenn.
I'm guessing you are refering to me. If not, then pretend someone else wrote it.
I didn't set it for "max voltage". This is not some great mod of mine to get max voltage. I'm just trying to set it right. I realize that once PE/WOT is engaged, more volage does nothing, but too much apparently throws a code.
I had it set correctly for idle at .54 volts, and i got a code 21 at WOT. However, we all know that the WOT setting is independant of the idle setting since the sensor can be moved all around and maintain an idle setting and change WOT at the same time and vise versa.
I hooked up the scanner and it was reading 4.9 at WOT. Then I lowered it to 4.6 at WOT, like I said. That seems to have solved the problem.
NOW WHAT I WAS ASKING is if 4.6 volts is a good setting. What is the minimum voltage for WOT signal from the factory? I thought it was around 4.5 volts or more. I'm not trying to jack the voltage up for more power, I'm trying to bring it down to get rid of the code 21.
I have an Ed Wright chip but I'm guessing he wouldn't change that value since he knew i was running stock electronics and mentioned nothing of that nature.
Not trying to sound mean or anything, and I'm sure you weren't either. I'm just trying to figure this out.

 

The "minimum voltage" for WOT is based on the %TPS inside the eprom. Generally, if you are getting 60-75% TPS (it varies at different rpm levels within the table) - then the ECM puts you into PE (WOT).

Different ECMs calculate the %TPS differently. On SD cars, the ECM will determine what the max voltage reading that can be obtained (say 4.3 volts) and the %TPS is based on that (4.3 volts). Other ECMs use 5 volts as the max reference.

It's deeply buried inside the code and not easy to see which method a particular ECM uses. But even if they use 5 volts as it's bases for calculating %TPS, 75% of 5 volts is only 3.75 volts.

Again, when you adjust your TPS, you should concentrate only on the minimum and for PE, adjust within the eprom. There are advantages to using different %TPS for various rpm levels, which the eprom allows you.

FYI, I have PE kick in from 60-45%, depending on the RPM level.

 

Ok,
Since i don't have the equipment, or knowledge yet on going into the chip and messing with those tables, i will just have to play with it till i stop getting code 21 and assume it is Ok.
So then there is no real number on when the PE is engaged, since it varies from computer to computer, and rpm to rpm within the tables.
thanx Glenn.