Messed up TPS?

[Liger Zero]

I found the link to test my TPS on my 1992 Eclipse GSX on here and this is where I got my info to try and test my TPS. TPS Adjustment

Now. first off when I unplugged my TPS I noticed that I had 4 prongs instead of 3 (1,2, and 4) like the guy stated in the article. So that threw me off and I dont know what thats supposed to mean, but I proceeded anyway assuming that prong 3 didnt even exist. So here what I got:

With my positive connected to prong 1 and my negative connected to prong 4 as per the article. My meter read a steady 4.77 Ohms with the throttle closed and is supposed to read 5 Ohms.

Next I moved my Positive to prong 2 and left my negative on prong 4 as stated in the article. My meter read .741 - .742 Ohms fluctuating with the throttle closed and its supposed to read .9 Ohms.

Now I did the WOT test leaving the positive and negative the same as previous test (prongs 2 and 4) and at WOT it reads a fluctuating 5.18 - 6.33 Ohms when its supposed to read 5 Ohms. While slowly opening the throttle though, the Ohms did not steadily increase, at about 3/4 throttle it spiked to 6.44 Ohms and dropped down to 4.91 Ohms and increased til I hit the WOT setting and fluctuated as previously stated.

Also, when I closed the throttle again after the WOT test with the positive and negative on the same prongs (2 and 4) it now read .897 - .899 Ohms instead of the .742 - .742 Ohms it read before.

So, is my TPS all messed up and needs replaced, or does it just need to be adjusted? Thanks!

 

[->PrOjEcTGS<-]

I have always used a logger to test mine. Closed should read 10%. WOT should read 100%. Any dead spots in between means it's bad. Doing it the way that it is listed on that website I have always come up with varying results. If you don't have a firm connection on the prongs it will give you skewed readings.

 

[Liger Zero]

What logger? What is it and where would I get one? Thanks!

 

[->PrOjEcTGS<-]

A datalogger tells you what all is going on with the sensors of your car. It's pretty much a cable that runs to your diagnostic port under the dash and then connects to a PDA or Laptop depending on what software you prefer. I made my own cable for <$10 and downloaded the TMO laptop datalogger software. Then you can pull some logs on your car and find out how well it it running as well as determining what sensors are bad.

digital tuning, inc. is popular

But if you have a laptop or a PC in your garage it's easy to make a cable if you know how to solder.

 

[Liger Zero]

Awesome! I found a cable in my center console that has a USB connection on one end and some other connection on the other but I didnt know what it was for, maybe thats it! Where is the diagnostic port located so that I can locate where to hook it up?

 

[->PrOjEcTGS<-]

take a picture of the cable for me will you? That way I can see how it's setup. A USB cable generally doesn't work for our cars unless it's a serial to USB adapter. Is the other end a plug or three spade connectors?

 

[Liger Zero]

Well I looked over the site and thats not the cable that I have... So if its not any trouble could you point me in the right direction to make my own like you did? Thanks!

Oh and I have a laptop that I can hook it up too

 

[Liger Zero]

Heres the cable that was in my car when I bought it

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[->PrOjEcTGS<-]

This is a great thread on it.

http://www.dsmtuners.com/forums/art...03316-how-set-up-mmcd-make-logging-cable.html

For a laptop though you swap pin 2 with pin 3.

And your laptop will need a serial port. If it doesn't you will need the keyspan serial to USB adapter.

 

[Liger Zero]

Picture is up^^^^^

 

[->PrOjEcTGS<-]

That's pretty much a serial to usb cable, but not sure if it will work for our application. I think you need one with some circuitry in it.

Like this: Newegg.com - KEYSPAN USB High Speed Serial Adapter Model USA-19HS - Apple Accessories

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[Liger Zero]

oh ok... well i guess ill try and make that $10 cable that you did, thanks so much for your help!

 

[->PrOjEcTGS<-]

No problem.

 

[steve]

I found the link to test my TPS on my 1992 Eclipse GSX on here and this is where I got my info to try and test my TPS. TPS Adjustment

Doing it the way that it is listed on that website I have always come up with varying results.

The procedure on the VFAQ site is wrong. It's wrong for all DSM's.

You can set the TPS by resistance if you know the actual sensor voltage, the total resistance of the TPS, and do the math to calculate the resistance for the voltage divider or you can just measure the output voltage with a logger or SAFC and set the 1G TPS so that it reads 0.5v with the throttle closed. Since the nominal full scale voltage is 5v that's 10% on the datalogger.

 

[Liger Zero]

All I have is a meter that reads voltage, ohms, etc. to work with. How can I find these statistics fro what it needs to be set too? Im very new at all of this, so any in-depth explaination would be very much appreciated

 

[->PrOjEcTGS<-]

Steve you have a wonderful way with words. Been so long since I had even attempted to setup a TPS without a logger I was confused.

Also, I believe the haynes manual shows a way to hook it up to get a voltage reading on a multimeter. You can intercept the signal similar to the VFAQ but read voltage while setting it up to .5v closed.

 

[Liger Zero]

Im now officially lost,

 

[->PrOjEcTGS<-]

Build your datalogger cable or buy one.... It along with the proper software will tell you everything you want to know about all of your sensor's health.

 

[Liger Zero]

is there a specific software that i will need to work with on my laptop?

 

[->PrOjEcTGS<-]

Either TMO Datalogger software or a Palm Emulator and MMCD.

 

[steve]

Steve you have a wonderful way with words. Been so long since I had even attempted to setup a TPS without a logger I was confused.

, I have to find some way to amuse myself or I'd go nuts repeating the same stuff over and over to each batch of new owners.

I wish I could take that VFAQ page down. Charles has so much good information on his site but the TPS page isn't. Anyone who wants to understand the issue with it should start by learning what a voltage divider is. Google will provide lots of links.