RandomTask

Any way in the ECU to remove the VATS/Passkey stuff?

Swapping the ECU into a race car, prefer to not have to mess with that stuff.

pcolt94

The easiest thing to do is find the resistance of the pellet in the key or find the key code on the 15 key chart and get the center resistance for that key. Then just add a resistor across the 2 wires for the key contact switch in the column. Then you can use any kind of ignition switch you want.

Also there is no ECU "name" used for the 96 (and others). The 96 uses a PCM for the engine computer. (ECU is reference to for older GM cars). The key pellet resistance is read by the CCM where it is part of the VATS system in the CCM . The PCM which runs the engine is turned on by the CCM so communication is necessary.

aklim

Are you having a genuine problem or is this just a case of you thinking it could be a problem and hence wanting to eliminate it?

arbee

Pretty self explanatory. OP says he is putting it into a racecar and doesn't want to mess with it.

pacoW

easiest VATs bypass.....get on down the road

pcolt94

Confused

I will not dispute your findings on the Camaro and what works for you.

But there nothing under the hood that looks the wiring on a corvette, where is the ECM, and wiring for it. On the vette with key ON power comes from 2 banks of fuses for the injectors directly. The injectors are fired by closing the return via the ECM/PCM.

Power for the coil comes directly from a fuse in the fuse box.

The ECM/PCM will do nothing unless the 50 cycle handshake is present from the CCM. If there is a way to eliminate this I'd love to know.

The ECM/PCM on a 92-96 vette has 4 multi wire connectors on the unit with lots of colors in each to choose from. No way you can just pick out a wire and connect it to another.

I think to eliminate the CCM and rip it out, I think you would have to change a lot of the software in the ECM/PCM to make it self sufficient, maybe I'm wrong?

mtwoolford

Easy way? well this worked for me on my 96, at the theft deterrent relay the large yellow wire 5 feeds twelve volts to the relay when the ignition switch is closed in the "start" position and when the relay closes that power leaves the relay via the 5 Purple wire which goes to the starter solenoid. Jump these two wires together and you are now independent of the CCM which only closes (or doesn't close thereby disabling the starter) the low amperage side of the theft deterrent relay.

In other words, you now have a conventional starter circuit minus the clutch safety switch. If doing a custom wiring, you could include a clutch safety switch in the circuit.

Now before I get flamed by those who probably know more than I do, this worked for me; there are those say it can't work because the VATS also disable the fuel injectors.

pcolt94

Are we talking about a 96 corvette. If yes, I'll look into it.

aklim

Since it is a race car, maybe he will need a tune. Can it, at the same time be programmed out of the ECM program?

Purple92

This would be my recommendation as well !!! If the car is going to be a track only car - the odds are high that custom programming is going to be needed due to engine mods - (and changing the fan "on - off" temps is probably going to take place as well). At that point - eliminating the VATS is childs play !!!

And since the 1996 is a full OBDII system - all the programming can be done through the OBDII connector - no PROM erasing and reburning...

PatternDayTrader

I like the VATS system and keep mine fully functional; it is genuinely hard to steal a VATS protected car without a tow truck. That being said, it has no place on a track car.

aklim

It is primitive compared to what we have today but it makes it harder to steal a car. I doubt it is significantly different than a modern Ford with PATS or Mercedes with DAS.