Ecu took a crap!

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Ecu took a crap!

Postby 2RM » Sat Nov 17, 2012 10:58 pm

So I ve been having this wierd issue with my check engine light. At times it would come on real dim, get brighter, then turn off, come back on and so forth... I tried tracing the short or loose connection in EFI circut to no result... took the brains out today and took them apart and discovered black burn marks on the smaller of the two boards.... Ill try to post pics.
The ECU is 89661-2B290. I have a spare J-spec 89661-20750. But it seems to have a very different pin out. And some pins like THG, CCO, ACT are missing completly... Does anyone one know what those are? Do I need them? Should I get a patch harness or re pin the ECU for it? What do you guys think? What are my options here?
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Re: Ecu took a crap!

Postby celicast184 » Sun Nov 18, 2012 9:13 am

act is for ac compressor turning on. i cant remember the rest. btw, i have a good running ecu from an mr2 if your interested. i can do 100shipped lmk.
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Re: Ecu took a crap!

Postby 2RM » Sun Nov 18, 2012 11:58 am

Is the pin out the same as my ECU? Whats the part number?
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Re: Ecu took a crap!

Postby celicast184 » Mon Nov 19, 2012 7:19 am

part number 89661-17331

they should be really similar.
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Re: Ecu took a crap!

Postby 2RM » Mon Nov 19, 2012 9:51 am

Let me check the pin out. I have a diagramm. It could be identical. The later MR2 and Trac ECUs have the same pin out. Ill let you know. Thanks man!
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Re: Ecu took a crap!

Postby 2RM » Mon Nov 19, 2012 6:34 pm

You have a J-spec ECU as well... The pin out is different just like on my spare GT-Four ECU. I need either a USDM late model MR2 or All-Trac ECU 89661-17390(MR2) or 89661-2B290(All-Trac)....
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Re: Ecu took a crap!

Postby celicast184 » Mon Nov 19, 2012 7:42 pm

koo, why dont u jus repin them then?? it should be real easy!!
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Re: Ecu took a crap!

Postby 4rsnduction » Mon Nov 19, 2012 9:48 pm

Re-pinning isn't that hard if you have the right tools.
Something super small to unclip each pin from the plastic multi connector, i use a really tiny screw driver, like really really tiny.
Removing the first pin from the multi connector is the hard part but once you figure it out the rest will be mega easy, just remember to remove 1 at a time so you dont mix anything up.
If you need some help just scream :?
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Re: Ecu took a crap!

Postby cmonteiro1 » Mon Nov 19, 2012 10:02 pm

I'm pretty sure I have a few ECU's that would work. I'll check part numbers when I get home.
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Re: Ecu took a crap!

Postby 2RM » Mon Nov 19, 2012 10:45 pm

Thank you guys! I may give it a shot :D I didn really want to repin the harness. Im affraid to get lost in all of those wires... Do you think I should repin or get a patch harness??? Another big question is what are the THG, CCO and ACT pins.... I think someone said ACT has to do with A/C.... I dont want to loose my A/C :P + I know nothing of the other 2 pins...
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