So i'm working on my 3800 swap and using a OBD1 computer I run across the VATS fuel security pin. My question is using the bypass resistor on Pin WD14 does it connect to ground? or basically from wd14>>> resistor>>> GND? Any help would be great thank you. and WOOHOO! it did fire up today for the first time only for a few seconds but WOOHOO I can't believe i got it that far! musta done something right.

anyone?

still no help, anyone help me with the wiring question?

Try here, (look at the schematic):
http://fp.enter.net/~rockcrawl/passkey.html
If this has helped you out hit my rateing button.
I had mine deleted from the PCM (what ever you call it,computer).

Allso found this info,a bit technical for me,thats why I had mine deleted:
There are 16 different resistors that could be used. If you check with a place that installs remote starters they should have a set of them (should not be more than $10.00). These resistors are like the ones you buy from a electronics store. Find the wiring for the key reader (yellow most of the time) and hook the resistor in series with the wiring. You'll have to start with the first one and keep trying till you find the right one. There is a 5 min wait between tries. When you found the right one the light will come one for a couple seconds then turn off and allow the car to crank.
Possibley this,below link.
http://cgi.ebay.com/ebaymot...TL0912192110004r9677

More info here:
http://www.fieros.de/en/articles/vats.html

[This message has been edited by James Bond 007 (edited 12-20-2009).]

quote Originally posted by James Bond 007: Try here, (look at the schematic): http://fp.enter.net/~rockcrawl/passkey.html If this has helped you out hit my rateing button. I had mine deleted from the PCM (what ever you call it,computer).

Rockcrawl no longer supports/sells stuff for the Fiero.

To answer original question: NO you can not just connect a resitor up to the PCM - *if* you wish to use the resistor methos you will need the VATS module from the car that the motor came from. The ouptput of this module connects to the VATs input og the PCM. You install the correct resistor to the input of the VATS module.

Options:

1) buy/build VATS bypass module (see this thread for the DIY info: https://www.fiero.nl/forum/Forum2/HTML/098096.html )
2) have someone program it out of the PCM (check with sinister fiero as he does this: http://www.gmtuners.com/ )

VATS for the 92-95 ECM uses 50 Hz (40-60Hz). 0-5V swing. A simple 555 timer will work.

ok so now i'm confused about something. I thought the vats module was incorporated into the pcm. is the vats a separate module under the dash? the pcm i have is a obd1 out of a 1994 le sabre.
anyone have a picture of one handy by chance?

It's a separate module for VATS. We usually just program the VATS out.

The VATS modual can be made by hand,but recentley there have been a few distributors of such a device pre made.This article is from a web page thats has since changed (no longer shows this Information).
GM VATS Passkey bypass circuit

When the vehicle's EPROM cannot be reprogrammed to "turn off" passkey, the vehicle's Passkey module or a clone must be used. An ECM programmed with the Passkey option requires a 30 or 50 hz 50% duty cycle square wave in order to enable the fuel injector outputs. The signal is only needed during cranking to get the engine started. This simple circuit can be built for a few dollars using parts that are available at Radio Shack. Below is a picture of the circuit built on a small PC board, and the same circuit being tested with a scope.



Maybe someone can answer your first question a little clearer.
note: For PASS-Key systems (30hz) R2 should be 22-23k ohms. For PASS-KeyII systems (50hz) R2 should be 13-14k ohms.

[This message has been edited by James Bond 007 (edited 12-21-2009).]

excellent information thank you. I have yet one last question before i build this circuit, is there a way to know if its a passkey 1 or 2 system? in order to get the right setup? 30/50

You do know that Baker Electronix sells these for $25.00 don't you? Order from the list they have on their site

I saw them but I was not sure if that was the right thing since this is no long in the car it came from.. I will prolly just order the one from Ebay.. its made by Baker. thanks again everyone for the info..

You know, most car stereo and alarm places sell cheap VAT bypass modules.

actually. i didnt know.. see on my Bonneville that had the pass key system i just installed the resistor under the steering column between the 2 ignition wires and was done with it. This is my first swap and I had no idea what all i needed from the donor wire harness. I has thought the vats was incorporated into the computer thus I wasnt looking for a separate module, and also there was no key for the donor car so I had no idea of which resistor I needed. but their are plenty of knowledgeable people on this forum that would help anyone and they do! to answer your question though, if i knew the answer to my own query I would not have asked it.. beyond that, like any good surgery, a 2nd opinion is always a good option. that is why i'm thankful for the wonderful people here that are not too elite to answer newby questions from guys like me. Thank you all for your help. I can hardly wait to drive this thing. Being diabled makes this moreso a challenge for me and after 6 months of learning how to the hard knocks way, i'm anxious. I'm changing out the fuel pump in a few days, and I ordered the bypass baker kit from ebay $19.99 shipped. maybe by the weekend this will sit and idle on it's own. that would rock my holiday! Merry Christmas to all that celebrate it.

All the info is in my post above.

1) click on the link
2) scroll down to the Passkey section of the first post
3) click on link and download file
4) open file
5) read text
6) build module

IIRC the text also indicates which system for which car.

The above diagram posted is 'stolen' from Rockcrawls website - please give credit where due.

Edit >> in case you are too lazy to do the above, here is a direct link to the file: http://members.shaw.ca/efog...20VATS%20circuit.doc

[This message has been edited by Mickey_Moose (edited 12-21-2009).]

Thanks everyone. I have the one from baker electronics on the way now. should be here in a day or 2.

good luck

quote Originally posted by James Bond 007: The VATS modual can be made by hand,but recentley there have been a few distributors of such a device pre made.This article is from a web page thats has since changed (no longer shows this Information). GM VATS Passkey bypass circuit When the vehicle's EPROM cannot be reprogrammed to "turn off" passkey, the vehicle's Passkey module or a clone must be used. An ECM programmed with the Passkey option requires a 30 or 50 hz 50% duty cycle square wave in order to enable the fuel injector outputs. The signal is only needed during cranking to get the engine started. This simple circuit can be built for a few dollars using parts that are available at Radio Shack. Below is a picture of the circuit built on a small PC board, and the same circuit being tested with a scope. Maybe someone can answer your first question a little clearer. note: For PASS-Key systems (30hz) R2 should be 22-23k ohms. For PASS-KeyII systems (50hz) R2 should be 13-14k ohms.

Former Fiero owner here. . .I now have a 95 Lumina--the running gear, electronics, and motor (3.1) are kind of next generation Fiero. Anyhow, a couple of weeks ago, my car started flashing the security light on the dash and wouldn't start. I used a very similar circuit to the one James posted, except it uses a trimpot to set frequency and deletes the zener diode. The trimpot gives it the ability to be tuneable-so that it will work for all varieties of Passkey.

I downloaded the diagram and discussion from here: http://newrockies.ca/build-the-full-bypass/ and built the little black box. Total cost was about $16, and it works. Completely removes passkey from the picture--the security lite is disabled and the car starts and runs just fine. As the site owner points out, it doesn't try to fool the passkey system it eliminates it and provides a signal for the PCM/ECM.

Very simple to hook up, you need a power source (chassis power,) a ground, and then you wire the signal into the appropriate pin of the ECM. Voila! Passkey disabled.

Had I know about the box from Baker Electronix, I would have gotten one of theirs. It took me the better part of a day to put the circuit together, troubleshoot my errors, and make repairs. Installation on a Passkey 2 with a separate TDM (theft deterrent module) takes less than an hour.

[This message has been edited by Brian Lamberts (edited 06-28-2010).]

Yep I ended up with the black box from Baker electronics.. it was $27.99 shipped to my door. 3 wires to hook up , and it works great! Box is waterproof, has a led to confirm it is working, its 1in x 1.5in x .5 in... very small and looks very nice. of course if you are going to have the PCM reprogrammed, it is useless as you can just have the whole vats thing deleted from programming.