Need help identifying an ECU

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Need help identifying an ECU

Postby Soup84 » Mon Feb 19, 2018 11:21 pm

The part number is all scratched off and unreadable. I've been looking at all sorts of pinouts and I've come close, but then I match the part number to another pinout and it doesn't match. The engine was swapped with a JDM motor and I have all the paperwork, but it only says "owner supplied motor and transmission" so I have no idea which gen motor it actually has. The pins closely matches "JDM ST185 Gen II 1993" in the pic, but when I look up the pinout from ECU part numbers: 89661-2B280 or 2B310, they don't match.

Any help in IDing this would be great or maybe someone could recommend a good company to rebuild it. Thanks!

rsz_1rsz_20180219_190008.jpg


pinoutsfixed.jpg
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Re: Need help identifying an ECU

Postby underscore » Tue Feb 20, 2018 4:30 am

89661-2B280 shows up as JDM 91 GTFour ECU. 89661-2B310 is a JDM 91 GTFour RC ECU. I see an EGW pin in your ECU, which is for the exhaust temp probe I believe, and I think that was a JDM only thing.

What exactly are you trying to do to it? If you just want the caps replaced the specs should be on the side of each cap.
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Re: Need help identifying an ECU

Postby FC Zach » Tue Feb 20, 2018 4:34 am

Also, what year car/harness do you currently have?

Edit: I have a '92 with a JDM Gen2 (no EGR) and my ECU number is 89661-2B290, here's a link in case you haven't seen this one: http://www.alltrac.net/phpBB2/viewtopic.php?t=34529
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Re: Need help identifying an ECU

Postby FC Zach » Tue Feb 20, 2018 5:21 am

underscore wrote:What exactly are you trying to do to it? If you just want the caps replaced the specs should be on the side of each cap.


Agreed, I that's what I did with mine. I got a bag of ten for a few bucks off ebay.
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Here's a not so good picture I took a while ago of the pins on mine. . Looks the same, from what I can tell.
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Re: Need help identifying an ECU

Postby Soup84 » Tue Feb 20, 2018 11:23 am

I'd love to just replace the cap, but my capacitor fluxed a bit too much. lol.
rsz_20180217_103730.jpg


That's a little too much damage for me to tackle, so I'm trying to find a good company to repair it. Unless I can match up the pins and get a new one.
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Re: Need help identifying an ECU

Postby FC Zach » Tue Feb 20, 2018 12:06 pm

That's one of the two that leaked on mine. Have you tried cleaning it?
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Re: Need help identifying an ECU

Postby Redrkt01 » Tue Feb 20, 2018 7:01 pm

There is a guy in southern illinois that does it for pretty cheap. Has his own electronics shop. Goes thru the whole board.
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Re: Need help identifying an ECU

Postby Soup84 » Sat Apr 21, 2018 5:43 pm

Update: I've shipped the ECU off for repair and was told they wouldn't fix it.

I took a detailed look at the ECU pins and what is actually pinned on the connector. No ECU pinouts I have looked at exactly match up. The closest I can get is an SW20 ECU part number -17390.
I've attached most of what I've been looking at including the my current pinout (my ECU on top and the connector just below)

Please... please... someone help me make sense of this!!!!
Attachments
rsz_20180421_141203_001.jpg
Copy of 3SGTE_ECU_PINOUT-1.xls
(46.5 KiB) Downloaded 21 times
pinoutsfixed.jpg
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Re: Need help identifying an ECU

Postby alltracman78 » Sun Apr 22, 2018 6:40 pm

I don't know which one you have but I can give you some info so you can figure it out. I'm assuming you have a Gen II 3SGTE.

1-US Gen II 3SGTEs have a heater wire for the O2 sensor, JDM ones don't. So if you have a 1 wire O2 senor you have a JDM ECU. If you have a 4 wire, you probably have a US ECU, though it is possible to have a US harness with the heater wire connected to a JDM ECU.

2-92/93 ECUs have a second circuit board above the first. It's for more detailed diagnostics. So if you only have 1 circuit board you have a 90/91 ECU. I believe that goes to 91/92 and 92 - 95 for the MR2?

3-The RC ECU has a pin for the intercooler level sensor. It's an open spot on all non RC ECUs. I don't remember which connector off the top of my head, but look it up, and if you have it, you have an RC ECU [or very slightly possibly a CS or Grp A]. If not, you have a regular ECU.

4-JDM engines came with a EGT sensor after the catalytic converter. If you have one, you have a JDM engine.

The US and JDM ECUs are plug and play with each other as long as you have the same revision [90/91 or 92/93] with the exception that a US ECU will throw a O2 heater code with a JDM harness.

The RC ECU is plug and play with the 92/93 ECUs except for the intercooler level sensor.

IIRC the MR2 ECUs are also plug and play with the same revision Celica ECU, but I'm not positive on that. If not very close.

The 2 revisions are very similar wiring wise. only 5? wires are different between the connectors, and either will run either engine just fine.

That's all I can think of right now, hopefully that helps.
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Re: Need help identifying an ECU

Postby Soup84 » Fri May 18, 2018 7:41 pm

Thanks so much for the help! Pretty sure it was a JDM motor with a US harness. Picked up a JDM ECU on eBay and she's running great again!!!


alltracman78 wrote:I don't know which one you have but I can give you some info so you can figure it out. I'm assuming you have a Gen II 3SGTE.

1-US Gen II 3SGTEs have a heater wire for the O2 sensor, JDM ones don't. So if you have a 1 wire O2 senor you have a JDM ECU. If you have a 4 wire, you probably have a US ECU, though it is possible to have a US harness with the heater wire connected to a JDM ECU.

2-92/93 ECUs have a second circuit board above the first. It's for more detailed diagnostics. So if you only have 1 circuit board you have a 90/91 ECU. I believe that goes to 91/92 and 92 - 95 for the MR2?

3-The RC ECU has a pin for the intercooler level sensor. It's an open spot on all non RC ECUs. I don't remember which connector off the top of my head, but look it up, and if you have it, you have an RC ECU [or very slightly possibly a CS or Grp A]. If not, you have a regular ECU.

4-JDM engines came with a EGT sensor after the catalytic converter. If you have one, you have a JDM engine.

The US and JDM ECUs are plug and play with each other as long as you have the same revision [90/91 or 92/93] with the exception that a US ECU will throw a O2 heater code with a JDM harness.

The RC ECU is plug and play with the 92/93 ECUs except for the intercooler level sensor.

IIRC the MR2 ECUs are also plug and play with the same revision Celica ECU, but I'm not positive on that. If not very close.

The 2 revisions are very similar wiring wise. only 5? wires are different between the connectors, and either will run either engine just fine.

That's all I can think of right now, hopefully that helps.
1992 GT-S Celica - Daily driver
1992 All-trac - Beautifully maintained show car
1993 All-trac - Salvaged parts, RIP
Soup84
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