94 twin turbo stealth wont start

[Ok3skid1]

If you have a pulse signal from the cam sensor and crank but no pulse to the PTU you dont need a second opinion unless somehow all three wires from the ECU to the PTU broke,.

Right... i got a good deal on a 94 hybrid ecu im going to install it as soon as it get in.

Im almost certain i know why im previous ecu failed in the first place. just way to embarrassed to say why haha!

[stealthee]

Its better that you post up what you think it is so someone else doesnt make the same mistake.

[Ok3skid1]

Its better that you post up what you think it is so someone else doesnt make the same mistake.

if you insist.
When I was hooking up my starter i placed my negative and positive terminals ip on the 2 posts that could clearly be seen.

After getting everything bolted on i placed the positive terminal back on and the starter. The starter just started spinning with the key off and everything... So i decided to unplug and swap thinking i had it on backwards... HAHA wrong when i swapped and plugged my pos. terminal back i saw a bunch of pretty colors and it melted my positive terminal on my battery. Little did i know or even remember the negative cable grounded on the transmission. Honest mistake... At this point i immediately pulled my starter and had it tested. It was still good but I think the sudden shock from the wrong grounding caused my ecu to pop.

[stealthee]

I doubt that would pop your ECU. There are fuses that would pop protecting the ECU.

[Ok3skid1]

I doubt that would pop your ECU. There are fuses that would pop protecting the ECU.

See thats what Kevin said 2. after checking all the fuses, the ptu and coils the last thing to check would be the ECU. He said the only thing not getting a good test was the ECU

[steve]

I doubt that would pop your ECU. There are fuses that would pop protecting the ECU.

There are fuses but none that will protect the ECU from the battery being hooked up backwards. The MFI fuse is 10A (IIRC) and the diodes on the ECU power input blow about the same time as the fuse. They don't however isolate the rest of the board from the reverse polarity just short and blow the fuse so there are other parts of the board that get reversed biased and can be damaged too.

[Ok3skid1]

There are fuses but none that will protect the ECU from the battery being hooked up backwards. The MFI fuse is 10A (IIRC) and the diodes on the ECU power input blow about the same time as the fuse. They don't however isolate the rest of the board from the reverse polarity just short and blow the fuse so there are other parts of the board that get reversed biased and can be damaged too.

Thats good to know!

I have an ecu im looking at but sadly im broke till thursday

[stealthee]

There are fuses but none that will protect the ECU from the battery being hooked up backwards. The MFI fuse is 10A (IIRC) and the diodes on the ECU power input blow about the same time as the fuse. They don't however isolate the rest of the board from the reverse polarity just short and blow the fuse so there are other parts of the board that get reversed biased and can be damaged too.

I have seen SEVERAL times where people hook the battery up backwards and it blows the battery fusible link. I'd say thats good enough to protect the ECU.

[R/T93]

I have seen SEVERAL times where people hook the battery up backwards and it blows the battery fusible link. I'd say thats good enough to protect the ECU.

/guilty.

Rebuilt an alternator thinking that was the problem, too.....

[Ok3skid1]

i didnt hook the battery up wrong i hooked the starter up wrong lol.

I guess in the long run it all does the same thing. I just hope its the Ecu cause i ended up selling some stuff and buying it today.

According to the tests everything was good but the ecu. all coils were getting spark through a pulse test and the ptu was showing good through the ohms meter. These tests were performed following stealth-316.

You guys have me freaking worried. that its not going to be an ECU