elusive VATS problem...
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Joined: Jul 2022
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From: Washington State
elusive VATS problem...
I've had my 90 Vette for a little over a year now with no problems with VATS, about a month or two ago it had been working intermittently, working most of the time, but then when it doesn't i have to disconnect the battery and reconnect it, then it starts up no problem.
I have already bypassed the key cylinder with the correct resistor, no change, works intermittently.
Next I tried replacing the starter relay, no change, still intermittent.
Now I wouldn't need to make a post about this, but all the fixes I've found here on the forum all have links to products that are no longer made, or the links just don't work anymore.
I have a feeling that it is the VATS module itself that is bad and A, either needs taken out and fixed or B, it needs to come out or completely bypassed.
I have seen where you can buy a new ECU chip and disable VATS, but I am not looking to spend the money for one, especially on a stock car.
any thoughts, where is the VATS module on the 90? I can only find posts for the 89 and below for the location.
I have already bypassed the key cylinder with the correct resistor, no change, works intermittently.
Next I tried replacing the starter relay, no change, still intermittent.
Now I wouldn't need to make a post about this, but all the fixes I've found here on the forum all have links to products that are no longer made, or the links just don't work anymore.
I have a feeling that it is the VATS module itself that is bad and A, either needs taken out and fixed or B, it needs to come out or completely bypassed.
I have seen where you can buy a new ECU chip and disable VATS, but I am not looking to spend the money for one, especially on a stock car.
any thoughts, where is the VATS module on the 90? I can only find posts for the 89 and below for the location.
Safety Car
Joined: Jun 2010
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Vats module doesn’t exist in 90-96. It is in the CCM. Most of what you read for fixes only works up to 89. Everything beyond that, most people don’t understand and info suggested is usually just bad.
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Joined: Jul 2022
Posts: 79
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From: Washington State
well that'll explain it. so then what would cause it to not work properly? does that mean ill have to get it reprogramed?
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Joined: Jul 2022
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From: Washington State
nothing, that I have noticed, haven't seen the light on unless I have the door open.
ill have to remember to look for it when it does it again.
it usually takes a while for it to do it again.
when i replaced the starter relay in the auto store parking lot, i thought it fixed it because i havent had any problems since, that was about a month ago
ill have to remember to look for it when it does it again.
it usually takes a while for it to do it again.
when i replaced the starter relay in the auto store parking lot, i thought it fixed it because i havent had any problems since, that was about a month ago
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Joined: Jul 2022
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From: Washington State
So it did it again yesterday, no Security light.
I had a theory right after that it had to do with my battery connection. There had been once when I first got it where the battery terminal had loosened up, the cable is worn and stripped out a bit, and lost all power when I turned the key.
So I just tightened, didn't disconnect, the negative terminal and it started right up.
it was very misleading because I cant hear my fuel pump and the starter was not going, making it seem like a VATS problem.
So I probably need to replace my negative cable.
I had a theory right after that it had to do with my battery connection. There had been once when I first got it where the battery terminal had loosened up, the cable is worn and stripped out a bit, and lost all power when I turned the key.
So I just tightened, didn't disconnect, the negative terminal and it started right up.
it was very misleading because I cant hear my fuel pump and the starter was not going, making it seem like a VATS problem.
So I probably need to replace my negative cable.
