Vats
Thread Starter
Instructor
Joined: Feb 2006
Posts: 170
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From: Tx
Vats
Looking for someone to remove vats from my computer in the Houston TX area. Car is a 1994 Corvette with a obdll connector and obdl system.
Car doesn't start at times. Usually will restart in 20 min. Help me out.
Car doesn't start at times. Usually will restart in 20 min. Help me out.
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If your problem is like mind, which others will tell you they experience the same problem is your STARTER is seize up, and when cools down, starts like nothing is ever wrong.
I would check and if it's your problem replace your starter and install a heat shield to prevent it to happen.
Good luck.
Team Owner
Joined: Jul 2004
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From: Hartford WI
Reason for bypass? Was something broken? Based on my 91 and others I have heard of, if it even cranks, it shouldn't be VATS although that won't stop people blaming it for the problem.
What you say it doesn't start, what do you mean EXACTGLY? Does it turn over? If so, does it try to run? Have you checked fuel pressure? Spark?
What you say it doesn't start, what do you mean EXACTGLY? Does it turn over? If so, does it try to run? Have you checked fuel pressure? Spark?
Thread Starter
Instructor
Joined: Feb 2006
Posts: 170
Likes: 6
From: Tx
Have not checked fuel pressure.
At times when you turn the key on the radio etc works but when you try to start nothing happens. Acts like a dead battery. Give it 20 minutes and it will start right up. The key wiring was done before I bought the car.
If I deprogrammed the vats that will be one thing out of the way. I don't need it.
At times when you turn the key on the radio etc works but when you try to start nothing happens. Acts like a dead battery. Give it 20 minutes and it will start right up. The key wiring was done before I bought the car.
If I deprogrammed the vats that will be one thing out of the way. I don't need it.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
Have not checked fuel pressure.
At times when you turn the key on the radio etc works but when you try to start nothing happens. Acts like a dead battery. Give it 20 minutes and it will start right up. The key wiring was done before I bought the car.
If I deprogrammed the vats that will be one thing out of the way. I don't need it.
At times when you turn the key on the radio etc works but when you try to start nothing happens. Acts like a dead battery. Give it 20 minutes and it will start right up. The key wiring was done before I bought the car.
If I deprogrammed the vats that will be one thing out of the way. I don't need it.
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Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 610
From: Orange, CA
You can then use a program called Flashhack to read the BIN from your car. Once you have your car's bin, you can use TunerPro with this XDF definition file to edit it any way you want, including disabling VATS in the PCM. Once that's done use Flashhack to flash the modified BIN back.
That said, couple of warnings.
1. If it really is a VATS issue, you may not be able to connect to the car. The car will only let you connect to it if the correct key is inserted (well, if the correct resistance is detected by the CCM). If you attempt to do flash operations while VATS is locking you out, you're going to have a bad time.
2. The core of VATS is the CCM, not the PCM, and you can only reprogram the PCM. Reprogramming the PCM to remove VATS fixes the fuel injector cutout, but it doesn't fix the fact that the CCM controls the fuel pump relay and the starter relay. These are separate issues that no amount of reflashing is going to fix.
3. Are you suuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuure it's a VATS issue?
I also have a resistor. I still had a VATS disable in my 90. The SECURITY light was on in RUN. I know my car well enough to immediately recognize what the problem (but not the cause) was. I waited 5 minutes, and it fired right up.
Next thing is to check for an H46 code in the engine ECM. You can do the ALDL jumper and read the service engine soon, or do the CCM diagnostics and look at Module 4.1 for an H46. 46 is "fuel-enable not received from CCM". There are also some CCM codes associated with improper resistance. I think 53.
Next thing is to check for an H46 code in the engine ECM. You can do the ALDL jumper and read the service engine soon, or do the CCM diagnostics and look at Module 4.1 for an H46. 46 is "fuel-enable not received from CCM". There are also some CCM codes associated with improper resistance. I think 53.
51 Pass-key invalid key detection
52 Pass-key key detection circuit shorted
53 Pass-key – key detection circuit open or shorted to battery
54 FEDS fuel enable failure
61 Pass-key – key #1 programming resistance out of range
62 Pass-key – key #2 programming resistance out of range
63 Pass-key – key #2 programming resistance low
Agreed that pulling codes would help in the diagnostic process anyway.
Last edited by Nomake Wan; Mar 14, 2021 at 01:26 PM.
Team Owner
Joined: Jul 2004
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From: Hartford WI
Drifting
Joined: Apr 2020
Posts: 1,925
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From: Orange, CA
I'm guessing it didn't actually take 20 minutes, but that OP simply waited 20 minutes anyway. The actual lockout period is 3 minutes (though if you perform another failed attempt during the 3 minutes, the timer resets).
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
Fair enough. I'd still like to see it fail and check if the starter is getting the signal from the "S" terminal or exciter wire or whatever it is we call it. My old starter would do that. It wasn't VATS (fully functional) but oil. Oil dripped down enough, messed up the starter so you would have to jump it if you didn't start it every couple of days. So we blame the battery until we found that it was good.