daveloveless

i have seen answers for other questions but no one will answer mine.94 firebird shuts off after 10 seconds.was thinking the passkey module is there anywaqy to bypass it to see if its the problem.fires good 42psi on fuel rail and sucking air like a main street ****.starts right up and dies 10 sec later.checked everything,no reason car shouldnt start ran great before.scantool says security problems.pleeeaaasssee help i want this out of my garage

Randy Bilyea

Trouble shoot it here:

4th Gen LT1 F-Body Tech-PassKey/VATS

Bypass it here:

http://shbox.com/1/vats_bypass.jpg

daveloveless

i checked ohms to passkey and is ok is there a way to bypass vats module

Randy Bilyea

This IS the link to bypass it....

daveloveless

i appreciate the help,believe me,this is a pain you know where.thanks again i will try the link

daveloveless

tried bypass of passkey but does same thing,starts about 10 seconds and dies could the converter be plugged ? i know the car ran rich when cold for a while before changing crank sensor and timing chain.after chain and sensor was changed it ran like a dream.filled up with gas one day and problems started

Randy Bilyea

Specifically, what was the error code that the scan tool showed?

daveloveless

the code i got was 46- theft deterent problems

jloshotz

No fuel pressure drop when it occurs? Almost sounds as simple as a plugged fuel filter. Unless you put one in last week, cheap to try

daveloveless

46 vehicle antitheft system problem

daveloveless

fuel pressure doesnt drop any and it sparks until engine quits turning

jloshotz

If it has anything at all to do with the 46, it SHOULD just never even run IIRC. Pretty sure it does kill the injectors. Have you ran a noid light on the harness to see if the injectors drop out? Also, does the car start right back up after dying?

Randy Bilyea

Then, no, you have a Pass-Key/VATS issue.

46 Pass-Key®II circuit

What did you do to try to bypass the VATS?

daveloveless

didnt think about the noid light.ill try that i guess i pulled too many hairs out trying to fix this problem.it dont make sense the car ran great

Randy Bilyea

From another site:

So the Security light is on or flashing in your vehicle and you are looking at 1 of 3 things. Either the vehicle won't crank over and start, It cranks but dies in a few seconds, or your vehicle shuts off while driving scaring the **** out of you. You have now experienced GM's worst security system ever created. GM's security, also known as Passlock Passkey or Vats.

There are 3 parts in this system:

1.The CHIPKEY
Normally a black resister chip in key which "communicates" to the lock cylinder. Sometimes is hidden in the plastic part of keys in new models. Same concept, might say PK1 PK2 PK3 PL or something similar to that. The newer ones work on frequency. Same thing tho.

2.The LOCK CYLINDER
Inside there are pins that read the chip in the key or the part that reads the frequency on new models. This then "communicates" to the TDM)

3.The TDM
Theft Deterrant Module-Sometimes called the "computer" or "brain". This is the part that sends the signal (**NOTE**) to your car and allows your car to start or continue running depending on your type of system.
If any of these parts are not communicating properly, your SECURITY light will come on and shut down your vehicle. The idea being, that without the chipped key or FOB key, the vehicle wont start and cant be "hotwired" or stolen. Pretty nice when working, but these systems are flawed and the average life is 6-10 years. Every single aspect of this system is expensive to replace and can only be worked on by "authorized" GM service men with out voiding warrenty. Most garages dont even touch them and if they do,
they will sell you every part they can before "fixing" the problem

*QUICK FIX TRICKS*
1st trick
Try a spare key that is newer or used less. The pins wear down with use and so do the keys causing the security to fail.

2nd trick
(if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my Buick for more than a year. Remember this is a temporary fix... If its shutting down while running, I'm sorry I have no quick fix...
*PERMINANT FIX*
Well since the lifespan of these systems are so short, and are extremely expensive to fix, and in my opinion far worse of a threat to owners than theives, my only perminant suggestion is to eliminate it completely. After a year of 10 minute tricks and a "key bypass" that lasted 2 months. I have only one good suggestion. After surfing the web for hours thru forums and websites i came across NEWROCKIES Inc | Bypass, disable and remove VATS, PASSKey and Passlock Security Systems in GM cars to the starter or injectors and so on. Thus eliminating the ENTIRE system COMPLETELY. I came upon a fork in my road. A TDM for $600 in my $1000 car or the $200 bypass. Or throw my car away. Lets say i now drive a Buick with the chip ripped out of the key and the TDM sitting in my glovebox for show
and tell. If you have any questions or anything else. Comment on this post
and i'll get an E-mail to reply to you. If you do choose to buy the bypass,
i have pictures of what a TDM looks like and will definately help you when
installing the newrockies bypass.

Good luck
Here is a list of known effected cars that can be fixed with the
newrockies bypass. This is the same list from the site and updates
frequently.