Disable VATS

[John Hess]

If you can reprogram the EPROM, try this.

Change EPROM Memory address &H0016 from &H10 to &H00
Subtract &H10 from what you find at EPROM Memory address &H0007 
write the resulting file back to the EPROM.

Address &H0016 is the VATS
Address &H007 is the low byte of the Checksum.

>----------
>From: 	Terry Martin[SMTP:terry_martin at mindlink.bc.ca]
>Sent: 	Friday, August 08, 1997 12:00 PM
>To: 	diy_efi at coulomb.eng.ohio-state.edu
>Subject: 	Disable VATS
>
>>Date:    Thu, 7 Aug 1997 13:48:43 -0400
>>From:    David Goodhue <dgoodhue at LYNX.DAC.NEU.EDU>
>>Subject: How can I disable Vats?
>>
>>My friend just bought a totalled 92 Z28 60K miles 350, (for $300).
>>The drivetrain was not hurt in the accident.  The kid who he bought
>>it off of, lost the keys to it (probally had to do with drinking and
>>driving).  My friend would like to part the car out.  Before he pulls
>>the engine he would like to video tape the motor running, but he doesn't
>>know if their is an easy way to bypass the VATS. Any susgestions?
>>
>>Dave
>>86 Conv.
>
>The cheapest way is get a 555 timer and clock it at a 50% duty cycle for
>the PCM VATS terminal to ground. Have a look at the Mitchell PCM wiring
>diagram and trouble shooting the VATS section. It doesn't straight out
>say it, but they even draw a little square wave pattern on the diag.,
>and tell you the 5v pull-up on the PCM should drop to 2.5v if the VATS
>is working. 
>
>Or if you want to get real cheap get a little electric motor out of a
>kids toy, and put a piece of tape to insulate 1/2 of the shaft. Use that
>as an armature and drag a piece of wire on it. You can vary the motor
>speed, and when you hit the right pulse rate, away goes the PCM. 
>
>I bet nobody ever fiqured a McCullough loop for this :-)
>
>Go fiqure.
>
>Terry
>
>