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Would you like some fried ECU with your order, Sir?

fuel

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Feb 23, 2009
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2,161
Location
Toronto, ON, Canada
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This ECU (MD166267) came out of a '91 E35A Eterna Sava I just picked up. Luckily I had an ECU spare I was able to fit and get it running. My question is does anyone know what specific bit(s) burnt out? I know of an issue where if the ISC shorts it can lead to the ISC driver on the ECU burning out. The ISC on this car appears to be working just fine but I thought I would ask anyhow as I don't want a repeat of this happening to the ECU I've just put in.

Thanks,
Phil
 

1990ggsxnj

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Joined
Nov 21, 2008
Messages
525
Location
Blackwood, NJ
Contact Jeff (Keydiver), he needs dead ECU's. Otherwise either he or TerryPosten can chime in. Havn't a clue here what that is.
 

That certainly appears to be one of the ISC driver chips, so there is no way your ISC is working properly. The 2 things that can generally cause that are either:
1) the 47uF cap is leaking, and has shorted the ISC trace underneath it, or
2) a shorted ISC, usually from a coolant leak inside the FAIV.
 

belize1334

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Nov 18, 2003
Messages
3,316
Location
Bozeman, MT
I'd unplug your ISC and test it immediately so that you don't fry the next ecu too.
 

fuel

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Joined
Feb 23, 2009
Messages
2,161
Location
Toronto, ON, Canada
yep will do.

I wish I could send the dud to keydriver but I'm over in little New Zealand and I think the postage to the states would be quite expensive :p
 

fuel

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Feb 23, 2009
Messages
2,161
Location
Toronto, ON, Canada
Ok I pulled the ISC out and there's no sign of coolant leakage, and the coils all measured between 36 and 39 ohms so no problems there too. I've been driving the car around lots and no sign of the new ECU going up in smoke either. The caps in the original ECU don't appear to have leaked, so I wonder what caused it to burn up to begin with.
 

stevep

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Oct 23, 2004
Messages
415
Location
St. Charles, IL USA
Quoting fuel:
The caps in the original ECU don't appear to have leaked, so I wonder what caused it to burn up to begin with.



It sure looks to me like not only have the caps leaked on that ECU but that the 47uf cap has shorted.
 
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