Can this ECU be saved (pic inside)

[DJ23GSX]

I bought this rebuilt ecu a few weeks ago and put it in and it appears that the iac driver doesn't work. It doesn't control the iac at all it just sits at 0 no matter what i turn on for accessories according to my pocketlogger. It idles at 1200rpms and surges sometimes. My old leaky cap ecu does exactally whats its supposed to with the iac and runs fine but sometimes shuts off the car and i get the clicking behind the radio. After looking closer at this rebuilt ecu i found this

I can see that the board is burnt under all that solder globber and was wondering if it might possibly be fixable?
http://img100.imageshack.us/img100/5360/croppeddsc03600qb4.jpg

 

[yokotabrat]

It's hard to say whether it's still good without doing some impedance measurements. Looks like the caps had leaked and damaged the board.

I'm assuming you meant ISC? If so, the ISC is actually controlled by two transistor driver chips IC105 and IC107 and probably not too dependant on the caps unless they happen to be decoupling the voltage rail that powers the ISC chips. Check to make sure those two chips are okay. There is a picture of them here: http://www.dsmtuners.com/forums/showthread.php?t=116585

When those go, they're usually burned pretty bad and take out a couple of traces on the board. Again, it's hard to know whether the traces are bad without following them or directly measuring them.

Let us know what you find.

 

[DJ23GSX]

Yes i mean the ISC. I checked the rebuilt ecu and all the drivers look perfect. No signs of leaks or burning at all.

Great info thanks

 

[steve]

Yokotabrat, The driver chips can look perfect and still be bad. The only thing you can count on is that if they are burned up that they're bad.

About half the ECU's I see have blown ISC drivers and perhaps a quarter of those have no outward signs of damage.

Who's "rebuild" work is that? It looks like it's starting to corrode and short the ISC via to the ground of C106. I know when I find signs of that via shorting to 12v that the driver is going to be blown.

Steve

 

[DJ23GSX]

according to the rebuild sticker it was done by www.autoecu.com in 8/03
The way i look at it is im stuck with it so i'd might as well do what i can with it. I'm not going to pass it on to someone else like it is. I supose if i can't get it to work right i could always take out the new caps and put them in my leaky ecu. Is it true the non-turbo ecu's use the same drivers like that link above states?

 

[yokotabrat]

Steve, good to know. Thanks. The couple I've worked on had them burnt to a crisp because of a shorted ISC coil, so it was obvious they were damaged.

The one NT ecu I've seen had the same chip. A part number check on the chip should tell you for sure. Donor ecus are about the only way to get those chips too. You'll want to get the via under the cap fixed before you replace the chip. If the via goes to the driver chip and it's shorting out, swapping the chip will just damage the new chip you put in. Good luck.

 

[steve]

These are M5269L drivers. They are the same on the all the Mitsubishi ECUs that I've seen.

Steve