ECU Circuit Board Ribbon Keeps burning up

[spank044]

I need some help with this one guys.

First off I have a 92 DE-T manual using an emance tune from Jason. His customer service is great and the tune runs like a fat chick on a frozen banana, but the ribbon on the ecu between pin 112 and the diode keeps burning up. I checked the diode and it is fine. The back of the board with the jumper is fine. There are no other shorts in the board. At first I thought it was in my harness so I put in a completely different factory harness, but it blew the ribbon on another ecu as well after the daughterboard and jumper were swapped into it. Then I took my stock ecu apart to swap the daughter board again, but that ribbon was already toasted but the car in stock form ran fine. So I went to the junkyard and pulled one from a 92 auto to use, but upon inspection that one is burnt too. I am currently fixing my stock ecu and transferring the daughter board. Can anyone check theirs to see if that ribbon is burnt. I now have 4 ecu's with that burnt ribbon and I need an outside opinion. One last thing I had a IT guy at work check out the board and he said he could not fine any problems with any of them, but the burnt ribbon. Also there are no shorts in my harness and I swap the injectors around to see if there was a shorted coil, but the #4 was the one to blow each time. Does anyone has a ECU pin out diagram by chance?

[spank044]

Bump for a new and different problem!

[modulation]

Bump for a new and different problem!

Did he provide the cable or did you?

You need to contact him. The cable is burning because something on the other end is drawing too much current or the wire in the cable isn't a low enough gauge.

Is their soldering really crappy?

[spank044]

No the ribbon trace in the ECM itself is what burned up. The problem has nothing to do with Jason.

[modulation]

You said "First off I have a 92 DE-T manual using an emance tune from Jason."Did you put the daughterboard in there, or did he?

You are talking about using ka24de ecu's right?Could you take a picture of the ribbon cable?

[480sx]

Idk i posted, edited, and my post isnt here anymore soo im just gona retype it. Prly gona get pwned by the double post, idk.

If the cars running fine with the 'Burnt Ribbon', then whats the problem?

This is also backed up by the fact that the other ECU's that you have pulled have the same thing going on.

Can you please take a pic for us to see what your talking about? I have a few of these ecus and i would like to compare your 'burnt ribbon' ecus with mine.

[spank044]

He put the daughter board in and it is a S13 ECM is a S13. The burnt ribbon is really a problem, but I just want to know if anyone else is having this problem and I would like to know what is on the other side of the diode and trace. The red line is the trace and it is burnt to a crisp.

[480sx]

Idk man, not a problem on my ECU's. I would trace that pin and figure out what its connected to in the engine or wherever. You can do this with a s13 FSM. Id be willing to bet its a part that commenly short circuts or something on a 240.

Still though man, why are you worried about it if your car runs fine? Seems much to do about nothing.

[spank044]

I tired to follow through the board and back to others pins, but the traces go through so many jumpers and what not I lose it. It's not that big of deal to me, but since I had four with that problem, I was just curious to see who else if anyone had this problem, mostly because even with the burnt trace it runs fine.

[OM3GA]

holy ****ing **** mine has the same problem! wtf is going on! well the burn up at least take a look at my thread! zerothread?id=371664 i have a picture with the same burnt trace... although its linking to pin number 36 'Ignition Switch' on there.. follow the trace to the pin then look at the pin-out online somewhere.. my car does not run at all it dosnt activate the fuel pump and does not have spark it just sits and cranks.. i have yet to figure out what to do

[h.240]

I had mine burn up once on me, but I think it happened from welding on the car without unhooking the battery . It burnt in the exact same place as yours, see pic -

All I did was clean the area up really good with an exacto knife, and then apply solder to join them. I haven't looked recently, but the car has been running fine since. Here is a pic of the repair -

[Joseph Davis]

That happened to a 54F00 I AFC "tuned" after the MAF wiring shorted to ground. I fixed it, and it would burn up again. Car still "ran fine" as well, go figure.

[Dimitri]

Diodes at the input of a circuit are usually there to protect the rest of the circuit from either overvoltage , reverse polarity or a reverse voltage spike that a motor or relay generates.It would help to know what gets connected there