Eliminate VATS
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,352
Likes: 230
From: Northeast FL
Eliminate VATS
Does anyone know how to completely eliminate the VATS system from a later C4? I know about the bypass that fools the computer but what about taking the VATS all the way out? I'm replacing the steering column so the ignition switch, fuel pump, lights, fan and ASR switches will all be mounted to the roll cage since the dash is already gone. That's why I want to eliminate the VATS.
Drifting
Joined: Oct 2003
Posts: 1,405
Likes: 4
From: Lorena Texas
These guys or any tuner can write it out.
http://www.pcmforless.com/
The bypass you buy has nothing to do with the steering column. It eliminates the circuit that goes from a connection below the column to the key switch and back. The ECM looks for a certain resistance (key pill) to complete a circuit so the car will start. You can also measure the resistance (key pill) and build a resistor to loop back to the ECM.
http://www.pcmforless.com/
The bypass you buy has nothing to do with the steering column. It eliminates the circuit that goes from a connection below the column to the key switch and back. The ECM looks for a certain resistance (key pill) to complete a circuit so the car will start. You can also measure the resistance (key pill) and build a resistor to loop back to the ECM.
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,352
Likes: 230
From: Northeast FL
These guys or any tuner can write it out.
http://www.pcmforless.com/
The bypass you buy has nothing to do with the steering column. It eliminates the circuit that goes from a connection below the column to the key switch and back. The ECM looks for a certain resistance (key pill) to complete a circuit so the car will start. You can also measure the resistance (key pill) and build a resistor to loop back to the ECM.
http://www.pcmforless.com/
The bypass you buy has nothing to do with the steering column. It eliminates the circuit that goes from a connection below the column to the key switch and back. The ECM looks for a certain resistance (key pill) to complete a circuit so the car will start. You can also measure the resistance (key pill) and build a resistor to loop back to the ECM.
And yes, I realize the bypass has nothing to do with the column. I referenced it only because since the computer looks for the ignition key and the key is being eliminated from the system, it was a way of explaining why I need to get the VATS out of the car. There will not be a key ignition on the car anymore so I have to work around the VATS. I just want to get the VATS completely out of the system so I don't have to worry about it failing. And any additional wiring I can remove is a plus.
Drifting
Joined: Oct 2003
Posts: 1,405
Likes: 4
From: Lorena Texas
It is a very small circuit and would be easy to get out of the way once the bypass is installed. Dont remember the color right now. Ecklers carries the bypass but you need to know the key #. Will be reliable also.
http://www.ecklers.com/catalogsearch...stem&x=12&y=11
http://www.ecklers.com/catalogsearch...stem&x=12&y=11
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
These guys or any tuner can write it out.
http://www.pcmforless.com/
The bypass you buy has nothing to do with the steering column. It eliminates the circuit that goes from a connection below the column to the key switch and back. The ECM looks for a certain resistance (key pill) to complete a circuit so the car will start. You can also measure the resistance (key pill) and build a resistor to loop back to the ECM.
http://www.pcmforless.com/
The bypass you buy has nothing to do with the steering column. It eliminates the circuit that goes from a connection below the column to the key switch and back. The ECM looks for a certain resistance (key pill) to complete a circuit so the car will start. You can also measure the resistance (key pill) and build a resistor to loop back to the ECM.
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Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Shouldn't make a difference, all you have to do is disable VATS on the tune as GP said and the PCM does not look for the fuel enable signal from VATS.
VATS is a factor in every C4 since '86
Doesn't send , it receives the fuel signal from VATS ( part of the CCM in your car).
If programmed to look for signal ,the PCM will not pulse the injectors without that signal input
It is a option on their tuning order sheet for 93+ cars
see
http://www.pcmforless.com/index.php?...id=5&Itemid=43
That only eliminates the key reader.
VATS ( and all wiring ) is still in place and functional, just that the module "thinks" the correct key is being used
This is a true VATS eliminator;
http://www.bakerelectronix.com/products_vats/
it supplies the correct fuel enable signal needed by the ECM/PCM to pulse the injectors
Need to manually bypass the starter enable relay component of VATS ( so all VATS wiring can be removed ) but not a problem with setup OP is using
If programmed to look for signal ,the PCM will not pulse the injectors without that signal input
see
http://www.pcmforless.com/index.php?...id=5&Itemid=43
VATS ( and all wiring ) is still in place and functional, just that the module "thinks" the correct key is being used
This is a true VATS eliminator;
http://www.bakerelectronix.com/products_vats/
it supplies the correct fuel enable signal needed by the ECM/PCM to pulse the injectors
Need to manually bypass the starter enable relay component of VATS ( so all VATS wiring can be removed ) but not a problem with setup OP is using
Last edited by rodj; Feb 4, 2011 at 05:21 PM.
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,352
Likes: 230
From: Northeast FL
Rodj,
Yes I know VATS was put in 86 and newer vettes. I am referring to the ECM itself and the challenge finding a realisticly priced code reader for it. Auto Xrays are a lot of money when I can get a reader that does the same thing for a 93 and older or 95/96 for a lot less money. I've called several of the code reader makers and they have all told me the 94 Corvette is excluded from their readers.
But they say they'll read a 94 Impala with an LT1??
Here's a quote from Bryan at PCMforless....."I can shut off the injector shutoff part of the vats. The starter and fuel pump part of the vats can be bypassed then by jumping out the VATS relay".
Since the ECM reprogramming does not eliminate the entire VATS issue I guess I'll just order the bypass from Eckler's. Seems like the easiest fix.
Thanks guys.
Yes I know VATS was put in 86 and newer vettes. I am referring to the ECM itself and the challenge finding a realisticly priced code reader for it. Auto Xrays are a lot of money when I can get a reader that does the same thing for a 93 and older or 95/96 for a lot less money. I've called several of the code reader makers and they have all told me the 94 Corvette is excluded from their readers.
But they say they'll read a 94 Impala with an LT1??
Here's a quote from Bryan at PCMforless....."I can shut off the injector shutoff part of the vats. The starter and fuel pump part of the vats can be bypassed then by jumping out the VATS relay".
Since the ECM reprogramming does not eliminate the entire VATS issue I guess I'll just order the bypass from Eckler's. Seems like the easiest fix.
Thanks guys.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
The programming takes out the requirement for the fuel enable signal to PCM.
Removing the relay is a simple as joining two wires together at the relay.
In a pre '90 car , you could then physically remove the VATS module and associated wiring.
With later cars like yours ,VATS is part of the CCM so all you could remove is the key to CCM wiring
Le Mans Master
Joined: May 1999
Posts: 6,520
Likes: 1,305
From: Windermere FL
No need to do a complete removal of VATs. I disabled it very effectively when I did my push-to-start conversion. Push-To-Start
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,352
Likes: 230
From: Northeast FL
You miss understand
The programming takes out the requirement for the fuel enable signal to PCM.
Removing the relay is a simple as joining two wires together at the relay.
In a pre '90 car , you could then physically remove the VATS module and associated wiring.
With later cars like yours ,VATS is part of the CCM so all you could remove is the key to CCM wiring
The programming takes out the requirement for the fuel enable signal to PCM.
Removing the relay is a simple as joining two wires together at the relay.
In a pre '90 car , you could then physically remove the VATS module and associated wiring.
With later cars like yours ,VATS is part of the CCM so all you could remove is the key to CCM wiring
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Drifting
Joined: Oct 2003
Posts: 1,405
Likes: 4
From: Lorena Texas
Just unplug the circuit under the steering column. If it starts it's written out.
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,352
Likes: 230
From: Northeast FL
Instructor
Joined: Oct 2007
Posts: 188
Likes: 3
Vats
I rechipped without VATS - this was a plug it on the right side, under dash, daughter plug in. I also had the fans turn on a little earlier at the same time. Than there is a bypass that needs to be spliced behind the heater ac panel. these 2 things killed VAT. I wasted time on the key resistor and a plug in resistor in the column - Also, there is an alarm that is 100% independent.
Life without VATs means I walk less and drive more
Life without VATs means I walk less and drive more
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,352
Likes: 230
From: Northeast FL
You miss understand
The programming takes out the requirement for the fuel enable signal to PCM.
Removing the relay is a simple as joining two wires together at the relay.
In a pre '90 car , you could then physically remove the VATS module and associated wiring.
With later cars like yours ,VATS is part of the CCM so all you could remove is the key to CCM wiring
The programming takes out the requirement for the fuel enable signal to PCM.
Removing the relay is a simple as joining two wires together at the relay.
In a pre '90 car , you could then physically remove the VATS module and associated wiring.
With later cars like yours ,VATS is part of the CCM so all you could remove is the key to CCM wiring
Cruising
Joined: Jan 2011
Posts: 11
Likes: 0
go to www.newrockies.com and read about the PRO VATS full bypass. I just finished installing mine and everything is working great.
