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


fuel
"Just to be pedantic!"


Galant VR-4 org Post #: 824037 posted 08/26/09 03:33 AM     Remind Me!  Send Private Message   Edit Post      




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



'91 E39A Galant VR-4 Evolution | '80 A164A Eterna GSR Turbo

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1990ggsxnj
Member ++
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Galant VR-4 org Post #: 824042 posted 08/26/09 06:26 AM     Remind Me!  Send Private Message   Edit Post      
Contact Jeff (Keydiver), he needs dead ECU's. Otherwise either he or TerryPosten can chime in. Havn't a clue here what that is.



"Is that Spool Drool? EWW!"
90GGSX Blue-Chesapeake
91GVR4 Nile Black-Sidney (Sid)

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keydiver
Unregistered


Galant VR-4 org Post #: 824091 posted 08/26/09 09:46 AM     Remind Me!  Send Private Message   Edit Post      
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.

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Turbo4door1
Paid to pewp


Galant VR-4 org Post #: 824121 posted 08/26/09 10:41 AM     Remind Me!  Send Private Message   Edit Post      
Looks rather familiar:

Another thread about a fried ECU



Danny

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belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 824173 posted 08/26/09 02:20 PM     Remind Me!  Send Private Message   Edit Post      
I'd unplug your ISC and test it immediately so that you don't fry the next ecu too.



Roger B. Scott
'91 Belize Green

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fuel
"Just to be pedantic!"


Galant VR-4 org Post #: 824200 posted 08/26/09 03:25 PM     Remind Me!  Send Private Message   Edit Post      
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



'91 E39A Galant VR-4 Evolution | '80 A164A Eterna GSR Turbo

-- Visit my JDM Galant VR-4 info & specifications site here! --

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fuel
"Just to be pedantic!"


Galant VR-4 org Post #: 824935 posted 08/29/09 02:50 AM     Remind Me!  Send Private Message   Edit Post      
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.



'91 E39A Galant VR-4 Evolution | '80 A164A Eterna GSR Turbo

-- Visit my JDM Galant VR-4 info & specifications site here! --

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stevep
Fixes ECUs


Galant VR-4 org Post #: 826877 posted 09/05/09 11:39 AM     Remind Me!  Send Private Message   Edit Post   
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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