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Cooked ECU - deep fried - with pics.


Turbo4door1
Paid to pewp


Galant VR-4 org Post #: 805142 posted 06/24/09 08:03 PM     Remind Me!  Send Private Message   Edit Post      
Well, I was going to take my Galant to get inspected tomorrow. I uncovered it, cleaned it up a bit, and decided to take it around the block - considering it is the first time I have been in it in about six months. Well, about half way around the block, I heard the ECU "click", the check engine light came on, and I lost power. I pulled over, shut the car off, and checked all the fuses and fuseable links. Everything appeared okay. I started it back up and drove home. It wouldn't idle when coming off throttle and I could smell the electrical burning smell. When I pulled in my driveway, I shut it off, and could visibly see the smoke coming from the passenger side of the dash. I jumped out and pulled the battery cable off. I pulled the ECU out, and below is the resulting carnage:









So, it appears whatever that row of black things is are toast. The caps look good, have been previously replaced, and don't appear to have leaked. The soot/smoke appears to have just drifted on to my DSMLink chip - and I am HOPING it isn't damaged.

Does anyone have ANY idea what would have caused this?

Who is currently the "go-to" guy for ECU repair? From what little can be seen in the pictures, does this even look repairable. And lastly, if someone reads this, and has a good socketed ECU they would like to unload, please shoot me a PM.

Thanks.



Danny

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ktmrider
Cool Guy Crowd


Galant VR-4 org Post #: 805146 posted 06/24/09 08:19 PM     Remind Me!  Send Private Message   Edit Post      
Ouch.
SteveP or Terry Posten are the folks to talk to.



Mike O.
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mistaVR4
Rest in Peace
484/1000


Galant VR-4 org Post #: 805189 posted 06/24/09 09:55 PM     Remind Me!  Send Private Message   Edit Post      
That sucks man! I would say you should most definitely remove and test (per the FSM) your ISC motor before you even plug in another ECU or it will instantly ruin the new one you put in, the black driver(s) are associated with the ISC motor and when it fails that is the result you get with any ECU. It sucks, I've had it happen to me and lots of people here have too. Depending on how bad it burned the board, it can most likely be repaired by the folks mentioned above.



SteveW
484/1000 Kensington Grey - Running VERY well :-)
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stevep
Fixes ECUs


Galant VR-4 org Post #: 805196 posted 06/24/09 10:16 PM     Remind Me!  Send Private Message   Edit Post      
Quoting Turbo4door1:


So, it appears whatever that row of black things is are toast. The caps look good, have been previously replaced, and don't appear to have leaked. The soot/smoke appears to have just drifted on to my DSMLink chip - and I am HOPING it isn't damaged.

Does anyone have ANY idea what would have caused this?




Your ISC or the cable is shorted. Those black things are the drivers for the ISC and the ones not burned up are for the various solenoids.

It's made a big mess but this damage is usually repairable. It's smells worse than it is.

You need to measure the coil resistance in the ISC and order a new one if they are less than 20 ohms or more than 40 ohms. If the ISC isn't shorted or open now you need to check the wiring harness to the ISC for shorts to the 12v wires running to the center upper and lower pins of the ISC.

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89coltgt
Hand Model


Galant VR-4 org Post #: 805204 posted 06/24/09 10:32 PM     Remind Me!  Send Private Message   Edit Post      
^^ Steve is the man when it comes to repairing damaged ecus, he has done all of mine and they are all going strong



89 Colt GT-14b, 650's, dsmlink, 2600
89 Colt GT-Stock
88 d50 4g63t, southbend dxd clutch, crower 272's, dsmlink



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Terry Posten
Old Balls
425/1000


Galant VR-4 org Post #: 805206 posted 06/24/09 10:34 PM     Remind Me!  Send Private Message   Edit Post      
Yep, Steve is right. The black stuff is conductive and must be cleaned off prior to replacement and repair of the traces.

I would not want to attempt that repair job because I can't test it properly to the level it will need to make sure everything is back to normal.

Steve would be my recommendation.



1992 Galant VR4 click
2010 Outlander GT S-AWC Premium w/nav (wife daily)
2010 Jaguar XF Premium Luxury (my daily

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Turbo4door1
Paid to pewp


Galant VR-4 org Post #: 805264 posted 06/25/09 06:55 AM     Remind Me!  Send Private Message   Edit Post      
Thanks guys.

A few more questions. I still have coolant going through my throttle body. Is it possible I finally got a leak that shorted the ISC and took the board out in this manner?

Also, would a short at the battery cause this? I have a battery tender I keep on the car. There is about a 15" pigtail that stays connected to the battery when I unplug the tender. When I went back out to look under the hood last night, I noticed the "cap" for the plug end of this wire had come off which left one of the two pins for the plug exposed. I didn't trace it back to the battery yet, but I am HOPING the exposed pin was the negative side and not the positive. Assuming it was the positive, and it was shorting the positive side of the battery to the chassis of the car, could it have caused this damage? The pigtail would have been flopping around in the area where the battery used to be. That's where I tuck it when I unplug it.

Thanks for the tips on the ISC. I will definitely throw a meter on it and test it out. I will be checking everything I can prior to plugging another ECU in. I live pretty close to the ECM Tuning guys (about 25 miles), so I think I might just take it to Dave Mertz to get checked out repaired. They can check out/clean my DSMLink chip while they are at it - to make sure it isn't damaged too.



Danny


Edited by Turbo4door1 (06/25/09 08:16 AM)

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keydiver
Unregistered


Galant VR-4 org Post #: 805284 posted 06/25/09 08:30 AM     Remind Me!  Send Private Message   Edit Post      
Quote:

I still have coolant going through my throttle body. Is it possible I finally got a leak that shorted the ISC and took the board out in this manner?



Yes, that is exactly what often causes this. The big O-ring for the FAIV leaks, and coolant gets into the ISC and shorts it out. When you pull the ISC out, look for discoloration from coolant on it.

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Turbo4door1
Paid to pewp


Galant VR-4 org Post #: 806838 posted 06/30/09 07:31 PM     Remind Me!  Send Private Message   Edit Post      
Okay, I went out and pulled the ISC - and as suspected, it is bad. Here are the readings between the pins:

1 - 2: 34.8 ohms
2 - 3: 9.6 ohms
4 - 5: .5 ohms
5 - 6: 36.9 ohms

I want to keep my ISC (due to the A/C and power steering). Aside form getting a new ISC, is there anything I need to do with the FIAV to make sure this doesn't happen again right away. I don't notice any clear signs that the FIAV leaked and caused the ISC to short, but assuming that is what happened, what else do I need to replace to be sure this doesn't happen again anytime soon?

Is it typical for the ISC to short without the FIAV leaking coolant on it?

Lastly, is JNZ about the best place to order the new ISC?

Thanks.



Danny


Edited by Turbo4door1 (06/30/09 07:33 PM)

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Terry Posten
Old Balls
425/1000


Galant VR-4 org Post #: 806847 posted 06/30/09 07:49 PM     Remind Me!  Send Private Message   Edit Post      
www.throttlebodys.com sell them. I think I saw $50 for a 1G style. They are rebiult (I think).



1992 Galant VR4 click
2010 Outlander GT S-AWC Premium w/nav (wife daily)
2010 Jaguar XF Premium Luxury (my daily

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GVR4_1057
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Galant VR-4 org Post #: 806850 posted 06/30/09 08:02 PM     Remind Me!  Send Private Message   Edit Post      
I have had great luck with the 2G black ISCs. Sometimes the 1G ones will test good but still idle bad due to wear. Now that I have gone black I have no intention of going back.



Billy B,
1057 Back after 5 years JSB
1604 all fixed again.
1986 Audi 4KQ
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Ian M
waiting for the bus
487/2000


Galant VR-4 org Post #: 806866 posted 06/30/09 09:07 PM     Remind Me!  Send Private Message   Edit Post      
Quote:

Is it typical for the ISC to short without the FIAV leaking coolant on it?





Yeah,in fact most companys will not warranty reman ECUs unless the ISC is also replaced.

I just made a blockoff plate and deleted the ISC and FIAV. No complaint with idle,even using the AC. I've already had one FIAV leak and short out the ISC,not taking the chance again.



#487/2000 Summit White

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Turbo4door1
Paid to pewp


Galant VR-4 org Post #: 807131 posted 07/01/09 06:47 PM     Remind Me!  Send Private Message   Edit Post      
Quoting Terry Posten:

www.throttlebodys.com sell them. I think I saw $50 for a 1G style. They are rebiult (I think).




Thanks Terry. I contacted Steve and have one of his rebuilt ones on the way. He seems like a great guy.

Billy - the one that was in my car, that shorted out, is one of the 2G Black ISCs. Go figure.

Ian - thanks. I ordered an FIAV o-ring gasket too, so I guess I will pull the throttle body off and at least replace it too - just in case.



Danny

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chris
Unregistered


Galant VR-4 org Post #: 807421 posted 07/02/09 03:08 PM     Remind Me!  Send Private Message   Edit Post      
thats some crazzzy ish!!! I hope your dsmlink is ok! I have never seen isc drivers go up in smoke like that! The car didnt fill up with a big cloud of smoke like when a cap goes? I guess ya gotta start hunting for a ecu now eh? Best of luck, i had my TB rebuilt by steve @ throttlebodies.com so i hope this doesnt happen to me.

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Terry Posten
Old Balls
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Galant VR-4 org Post #: 807596 posted 07/03/09 02:32 AM     Remind Me!  Send Private Message   Edit Post      
I JBwelded the FIAV section completely closed. I kept the ISC paths and now just run it that way.

Runs perfect, but my car never sees cold weather.



1992 Galant VR4 click
2010 Outlander GT S-AWC Premium w/nav (wife daily)
2010 Jaguar XF Premium Luxury (my daily

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deez
Nutz


Galant VR-4 org Post #: 807916 posted 07/04/09 10:08 AM     Remind Me!  Send Private Message   Edit Post      
So the 2G ISC and 1G are compatible? No problems switching the two out?



#802/1000 Daily Driver SOLD!
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GVR4_1057
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1604/2000


Galant VR-4 org Post #: 807922 posted 07/04/09 10:43 AM     Remind Me!  Send Private Message   Edit Post      
No problem at all. It is a plug and play situation.



Billy B,
1057 Back after 5 years JSB
1604 all fixed again.
1986 Audi 4KQ
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Launch
Member +
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Galant VR-4 org Post #: 808010 posted 07/04/09 05:35 PM     Remind Me!  Send Private Message   Edit Post      
Ive taken the ground wire from the harness-ISC and made a ground strap to firewall. Why such a strong stepper motor has no ground other than to board i have no clue.

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deez
Nutz


Galant VR-4 org Post #: 808033 posted 07/04/09 08:53 PM     Remind Me!  Send Private Message   Edit Post      
So then why use a 2G vs. a 1G??



#802/1000 Daily Driver SOLD!
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click

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keydiver
Unregistered


Galant VR-4 org Post #: 808136 posted 07/05/09 01:37 PM     Remind Me!  Send Private Message   Edit Post      
Quoting Launch:

Ive taken the ground wire from the harness-ISC and made a ground strap to firewall. Why such a strong stepper motor has no ground other than to board i have no clue.




I don't see how grounding the ISC will do any good. The coils get pulsed to ground through the ECU, but nothing inside the ISC is grounded at all.

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Turbo4door1
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Galant VR-4 org Post #: 811263 posted 07/15/09 08:01 PM     Remind Me!  Send Private Message   Edit Post      
I emailed Tom Dorris from ECM Tuning, and am going to be shipping it off to them in the next couple days. From the pictures I sent him, he said it is close to, if not THE WORST he has seen the drivers burn up. He seemed optimistic that they can fix it.

I have been toying with the idea of updating to ECMLink V3 while they have it - but I don't really think I need to. The current version I have works perfectly, and for the small amount of mods I have, I'm just not sure I would get any extra bang for the buck.

I'll update the thread with "after" pics and the results when I get it back (hopefully working and all cleaned up).



Danny

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GVR4_1057
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1604/2000


Galant VR-4 org Post #: 811273 posted 07/15/09 08:14 PM     Remind Me!  Send Private Message   Edit Post      
I was thinking that since ecmlink came out they have been getting the old dsmlink boards back like crazy from people upgrading. I think that even if your dsmlink board is trashed they should have a bunch lying around. I know mine is around there somewhere



Billy B,
1057 Back after 5 years JSB
1604 all fixed again.
1986 Audi 4KQ
1997 BMW E36 328I

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Turbo4door1
Paid to pewp


Galant VR-4 org Post #: 813947 posted 07/23/09 04:27 PM     Remind Me!  Send Private Message   Edit Post      
Got my ECU back from ECM Tuning today - all fixed up. They said it appeared to have actually been on fire - not just melted. I believe it based on the amount of smoke rolling out of the dash and the amount of soot on the board. They also installed an updated DSM Link Eprom for me that has all the latest bug fixes. They said the one I had in there was "REALLY" outdated. It worked - so I never messed with it.

It cost me two hours of their labor time, but I am confident they went through it and made sure everything was cleaned up and working properly. Guess we'll find out when I get time to put the car back together.

Here are a couple of the "cleaned up" pics:







Danny


Edited by Turbo4door1 (07/23/09 04:28 PM)

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strokin4dr
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Galant VR-4 org Post #: 814155 posted 07/24/09 10:05 AM     Remind Me!  Send Private Message   Edit Post      
Awesome. Nice to hear that they were able to save it.



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GVR4_1057
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Galant VR-4 org Post #: 814179 posted 07/24/09 11:03 AM     Remind Me!  Send Private Message   Edit Post   
Sweet Dave does great work and it looks like you got your link updated too. Now get that thing back in so we can get the guys together again.



Billy B,
1057 Back after 5 years JSB
1604 all fixed again.
1986 Audi 4KQ
1997 BMW E36 328I

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