The correct ECU for a USDM ST185 from 1990-1991 is 89661-20761. While we have a working spare, we also have two ST185's, and due to how scarce these are, we aren't wanting to sell our spare. Out two ST185's are all stock, so the OEM ECU is still needed for them.
The correct ECU for a USDM MR2 w/3S-GTE engine is:
- 89661-17330 (from 1/1990 thru 2/1990)
- 89661-17331 (from 3/1990 thru 12/1990)
I can't tell you what is different between an ST185 & an MR2 ECU. Don't know.
I'm thinking someone on this forum may have a spare they maybe don't need after changing out the OEM ECU to an aftermarket ECU involving a fuel control modification made. Hopefully someone has one and is willing to sell it.
There were a few folks selling ST185 parts in this forum over the past month or so. Check the for sale adds in this forum - maybe someone is selling an OEM ECU. Actually, the person on this thread is selling an ST185 ECU - but I think is wanting to sell it has part of a package with more items:
-
viewtopic.php?f=14&t=54089