I think my TPS is out of adjustment

[L2RTSiAWD]

When I match up the AFC and Logger the throttle position on the afc will read like 10% and the logger will only read 3% and I get some funky surge.

Plus when I have my foot on the pedal very slighty lets say 0-5% throttle.

The afc reads the 0-5% throttle but the logger still shows 0% throttle.

Any Ideas?

 

[mavisky]

I'm having similar issues, the lowest i can get mine to read (after adjustment on just the logger no s-afc for me anymore) is 4%, yet with the throttle floored it will only read 97%

stupid old cars

 

[92redman]

I am at school so I don't have the service manual, but there may be a service proceedure for adjusting TPS. Also, is it possible that you may have some resistance in the wiring to the AFC causing it to read higher?

How do the readings compare throughout the swing? Do they consistantly read differently, or is it the lower TPS values?

 

[L2RTSiAWD]

How do the readings compare throughout the swing? Do they consistantly read differently, or is in the lower TPS values?

I'm going to check this on the next drive I do. I need a passenger since it's hard to drive, read the AFC, and read the logger at the same time

 

[DSMvroom]

well my tps is totally bunk. I got CEL about a month ago and it was p0121?? anyway it is TPS.


What the hell does the tps do anyway? I mean, besides knowing how open the throttle plate is, what is the point?

 

[92redman]

well my tps is totally bunk. I got CEL about a month ago and it was p0121?? anyway it is TPS.


What the hell does the tps do anyway? I mean, besides knowing how open the throttle plate is, what is the point?

It is used for calculations in fuel especially when accelerating and decellerating. Ever hear of an accelerator pump? Well the TPS can be used to mimic the funtion of that for fuel injection. Also it is used for limp in if the maf is malfunctioning.

 

[L2RTSiAWD]

I haven't had a chance to run with the logger and afc yet but I will keep ya posted.

 

[steve]

I've posted the correct procedure for setting the 2G TPS several times.
The key is that what you actually set is the point where the integral IPS opens. The actual TPS voltage can vary quite a bit and still be correct. Keep in mind that the SAFC displays the percent based on the min and max voltages it's seen. What various dataloggers reports depends on how they decided to represent the ECU voltage reported. I believe the DSMlink also scales the TPS output. Don't know what other OBD-II loggers do.

Steve

 

[1fast97gsx]

maybe the throttle stop screw is in too far?

 

[L2RTSiAWD]

I've posted the correct procedure for setting the 2G TPS several times.
The key is that what you actually set is the point where the integral IPS opens. The actual TPS voltage can vary quite a bit and still be correct. Keep in mind that the SAFC displays the percent based on the min and max voltages it's seen. What various dataloggers reports depends on how they decided to represent the ECU voltage reported. I believe the DSMlink also scales the TPS output. Don't know what other OBD-II loggers do.

Steve

I was trying to find your posts.

Did you right a tech article about it?

 

[steve]

I was trying to find your posts.

Did you right a tech article about it?

Nope, try this http://www.dsmtuners.com/forums/showpost.php?p=660531&postcount=4

Steve

 

[L2RTSiAWD]

ok I found this by searching on your posts.

2G's critical TPS adjustment is the Idle Position Switch that's part of the TPS.
(2G TPS pins are 1- 5v, 2- TPS output, 3- IPS output, 4-ground)

You place a .177" feeler guage between the stop screw (fixed SAS) and the throttle pulley to open the butterfly and then adjust the TPS right to the point where the IPS (pins 3 and 4 on the TPS) switches from closed (0 ohms) to open (infinite ohms). Then you verify that the TPS (pin 2 and 4) reads between 0.4 and 1V while the feeler guage is still in place. Anything in that range is ok as long as the IPS is adjusted correctly. It it's not correct you need to check that pin 1 is about 5v and pin 4 is grounded. If they are correct then the TPS is bad.

There is no way to adjust the TPS voltage independantly of the IPS on a 2G. Trying to correctly set a 2G TPS by voltage will only work by dumb luck.


I guess I need to get a feeler gauge then, I never tried to mess with the SAS

 

[mavisky]

any clue at all on my 1g??

 

[steve]

I guess I need to get a feeler gauge then, I never tried to mess with the SAS

That's good, you don't want to. A typical sheet of copy paper folded over twice (or 4 thicknesses) is about .15". It's just a spacer to hold the butterfly while you set the IPS trigger point.


Mav, your 1G should read about 10% at idle on most OBD-I loggers. That translates to a TPS voltage of about 0.5v. The 1G IPS in on the back side of the TB and unless somebody F'd with it should be fine. Since it's a pain taking the voltage reading on a TPS (toy have to make an adaptor, slide some probes in between the wire and seal, or connect at the ECU. I just set it to 10% using MMCd nowdays, that's close enough.

Steve

 

[L2RTSiAWD]

Thanks I'll try that.

I guess I will have to look at the TB because I'm not sure of the place to put the paper (between the stop screw and SAS )

I supposse I never look at the other side of the TB...

 

[TalonTSi-AWD91]

any clue at all on my 1g??

What are you using to log?

 

[steve]

I guess I will have to look at the TB because I'm not sure of the place to put the paper (between the stop screw and SAS )

Somehow you misunderstood, the stop screw = the fixed SAS. The paper/feeler gauge goes between that screw/bolt and the part of the throttle pulley (that the cable rides on) that hits the bolt where it comes out the back of the TB flange. It's the throttle stop if you want to think of it that way. The FSAS runs through the casting below and to the left of the TB inlet.

Steve

 

[mavisky]

What are you using to log?

pocketlogger and m100. the original cable too, not some ripoff

 

[L2RTSiAWD]

Somehow you misunderstood, the stop screw = the fixed SAS. The paper/feeler gauge goes between that screw/bolt and the part of the throttle pulley (that the cable rides on) that hits the bolt where it comes out the back of the TB flange. It's the throttle stop if you want to think of it that way. The FSAS runs through the casting below and to the left of the TB inlet.

Steve

Ok now that makes complete sense. Thanks for clearing it up.

I also log using a palm 515 and pocketlogger ODB-II SW.

 

[TalonTSi-AWD91]

pocketlogger and m100. the original cable too, not some ripoff

When your car is idling it should read 10% since you have a 1G.
http://www.pocketlogger.com/index.php?pid=params&param=tps&type=dsm

 

[steve]

When your car is idling it should read 10% since you have a 1G.

I think I said that 6 posts ago.

 

[TalonTSi-AWD91]

I think I said that 6 posts ago.

Oops, didn't even see that.

 

[Quasimondo]

Out of curiousity, does the TPS value need to be dead on? My logger shows 9.7% at idle and 99.7% at WOT, for example.

 

[TalonTSi-AWD91]

Out of curiousity, does the TPS value need to be dead on? My logger shows 9.7% at idle and 99.7% at WOT, for example.

That's pretty good as it is, the value doesn't need to be exact.

 

[2GeNTSi]

Eh mine would show around 85-90% at WOT...don't know why it's so low.