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Author Topic: Battery shorted out on a wrench, now car won't start.  (Read 17752 times)

Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #15 on: March 12, 2011, 07:42:47 pm »
"I think you might be confused about this"

I guess I was, Ill pull it out tommorow morning, when I had to do my 1g I had to pull the entire center consol out and really pry at it to get to it and it took a long time.


My CEL does come on, but from a previous issue with the p/s pump.


"have you even pulled the spark plugs with them still connected and check for spark?    do you hear the fuel pump?"
-Havnt listened for the fuel pump but it is getting power
-Yes I have pulled the wire, attached another plug to it and looked and listened for spark, put it against a ground as well and nothing at all happened




So I'll pull it apart tommorow morning and open up the ecu. I guess it should be pretty easy to spot. Is there any other bench testing I can do before I put it back in?

If it is ok then what do I do?
« Last Edit: March 12, 2011, 07:46:19 pm by Mikael Mikkelsen »
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Offline Remi Raymond

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #16 on: March 12, 2011, 09:59:06 pm »
No what I mean is key to On watch the CEL. The normal behaviour if the key is on and the car is not started is it comes on and stays on for 5 seconds, then goes off. If it doesn't come on it means something is wrong with the ECU, it's kindof like an ECU test, thats why I asked.
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Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #17 on: March 13, 2011, 12:33:35 pm »
OK Pics of the ECU:
http://img59.imageshack.us/i/p1010912i.jpg/


None of the caps are blown,but there is some really weird resin stuff on the bottom, and some of the connections look like there burnt to an extent, but nothing is touching that I can see
« Last Edit: March 13, 2011, 01:24:39 pm by Mikael Mikkelsen »
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Offline Remi Raymond

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #18 on: March 13, 2011, 05:38:22 pm »
Nothing to my eyes either, although I'm not an expert.
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Offline John Hartman

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #19 on: March 13, 2011, 06:05:30 pm »
take one of the other side of the board too.

As well, if you can find someone close to you with a 2g turbo car you can try your ECU in thier car and theirs in yours.
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Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #20 on: March 13, 2011, 06:22:02 pm »
Will do, I took another picture but was unable to upload it. Ill try again soon.

Ill also take a picture of my ISC, I took it out to clean the throttle body and inspect everything, since I wanted to change my seals anyways, the ISC is very very brown and burned looking on the inside. I tested the motor with the ohmmeter, and it worked. But then I applied 6volts to it and the motor barely moved at all, it was more of a twitch
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Offline Remi Raymond

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #21 on: March 13, 2011, 06:27:34 pm »
FYI on a 1g it would be these drivers in red

I assume 2g is similar. They look ok to me, but lik John says se eif you can beg borrow or steal a spare 2g ecu and see if your car fires up.
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Offline Jordan Kruger

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #22 on: March 13, 2011, 06:52:04 pm »
check the back of the board like john suggested.  in some cases the charge will unsolder a connection.
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Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #23 on: March 13, 2011, 07:56:41 pm »
Heres the back of the board

I dont see any connections that look like they're bad



« Last Edit: March 13, 2011, 07:58:43 pm by Mikael Mikkelsen »
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Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #24 on: March 13, 2011, 07:57:58 pm »
And the ICS it looks pretty bad


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Offline Remi Raymond

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #25 on: March 13, 2011, 09:20:20 pm »
That is cooked for sure. Bad ISC's can burn out ECUs so do not do anything until you have it disconnected or replaced. You could damage another ECU.
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Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #26 on: March 13, 2011, 09:48:54 pm »
Nice, thats a good thing. Means I'm on the right track...

Anyone got an ISC for sale?



Oh and when I do the 6v test nothing happens at all anymore, so its gotta be right shot.
« Last Edit: March 13, 2011, 09:55:02 pm by Mikael Mikkelsen »
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Offline John Hartman

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #27 on: March 13, 2011, 09:57:53 pm »
yep, that ISC looks like it got damn hot.  Don't run a known good ECU with that one.

However, looking at the ECU rear picture, I don't like that smoky looking residue top left corner.  I don't like some of the other parts near the bottom center either, but it could just be shadows from the camera.  That top left corner with the smoky stuff I don't like.

oh yea, again, the ISC is not going to stop the car from starting, either spark, fuel or timing.  It will allow/help it to idle on its own.
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91 Eagle Talon TSi 5spd awd.  GT-12, TriFlow Cams, 850s, Tial, JIC, Jackal, sticky rubber.
86 Merkur XR4Ti 5spd, rwd, turbo, 91,381km.  Original paint, heated leather. intercooled, big VAM, Full 3" exhaust, Cossie sway bar, 16" tires.
06 Mazdaspeed6 6spd awd, DISI turbo, heated leather HIDs, Corksport, Cobb, Konig, Centric...
2018 VW Golf Alltrack turbo Tornado Red, 6mt, some free mods

Offline Mikael Mikkelsen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #28 on: March 13, 2011, 10:21:51 pm »
Ok, well ill source out another one, see what happens, and then is a replacement ecu just the next step? Is there any other troubleshooting I can do before I dive into an expensive part. And if I do have to get a new ecu I guess only the 95's can be modded from what I hear, so ill need one of those. I'm thinking if that's the route I may have to talk to andrew and see if I can get one chipped, I don't think I'm going to be in the position to pickup dsmlink after all this
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Offline Chad Giffen

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Re: Battery shorted out on a wrench, now car won't start.
« Reply #29 on: March 14, 2011, 08:27:36 am »
ISC's are known to fail in the open position as a fail safe. Thus, the car should still start in theory, but just give you idle surge because the stepper motor twitches back and forth.

Hopefully I'm wrong.

And John's right...    That smokey residue in the top left of the rear side of the ECU looks like a short. Get some vinegar and a tooth brush and wipe that away. Don't use acetone, or it will dissolve the protective layer on the ECU board.
« Last Edit: March 14, 2011, 08:30:55 am by Chad Giffen »
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