3sgte swap, ECU Question Options

[115celi]

Basically, I am middle of a 2nd gen 3sgte swap and my wiring is setup for a 90-91 ecu (pinout from DR Tweak). It cranks but there is no spark. We have checked the igniter, coil, distributor and wires using the BGB from celicatech, and they all check out.

I went to google to see if I could find any info and ran across a web-site with some ecu part numbers. http://www.toysport.com/webpages/WebUpdate...A20ECU20WEB.htm
I found an ecu that had 89661-20760 for the part number and was wondering if there is a difference between this one and the 89661-20750?

I thought mine was right, I thought the part number on the ecu was 89661-20750 but part of the 5 is missing and it isn't really legible. I figured it was right based on the part numbers listed in a thread I found.
JDM 185 ecu's-
89661-20750=89/10-90/03(superceded to 20751)
89661-20751=90/03-91/08
89661-2b310=91/08-92/02
89661-2b280=91/08-93/09

Does anyone know if there is any difference between the ecus with 89661-20760 and 89661-20750, thanks.

[115celi]

after a little more searching i found this site and i guess that the only difference is one is usdm(60) and the other jdm(50).

http://www.ts-ogn.no/files/3sgte-ecu-pinout.htm

usdm has cold start and egr on 26 pin, and doesn't have act or cco on 22 pin.

Any ideas why i wouldn't be getting spark, I did the trouble shoot in the bgb from celicatech.com and everything tested out. i'll keep seaching.

I am glad to have this site as a recource otherwise i'd be completely screwed!

[Coomer]

Have you pulled off the ECU cover (should just be a few screws) and seen if there are pinouts printed on the circuit board where the harness plugs plug in?

I know AE101 ECUs have the pinouts printed there...AE111 ECUs don't, and I have no idea about ST185 ECUs.

[Gary]

ST185 ecu has pinouts printed on the circuit board.
Remove the cover and compare the pinouts with the one in BGB.

This post has been edited by Gary: Feb 11, 2007 - 10:45 PM

[115celi]

ST185 ecu has pinouts printed on the circuit board.
Remove the cover and compare the pinouts with the one in BGB.

What if there is no pinout on the curcuit board? I checked for this before and I am sure it wasn't there but I'll double check.
DR_Tweak gave me the right pinout for the JDM st185(which I'm sure is what the ecu is out of because we had the whole front clip), and that is how it is wired.

[Gary]

ST185 ecu has pinouts printed on the circuit board.
Remove the cover and compare the pinouts with the one in BGB.

What if there is no pinout on the curcuit board? I checked for this before and I am sure it wasn't there but I'll double check.
DR_Tweak gave me the right pinout for the JDM st185(which I'm sure is what the ecu is out of because we had the whole front clip), and that is how it is wired.

It is there.
If you have 2 boards, you'll need to remove the top one first.

[toyotacrazy]

Basically, I am middle of a 2nd gen 3sgte swap and my wiring is setup for a 90-91 ecu (pinout from DR Tweak). It cranks but there is no spark. We have checked the igniter, coil, distributor and wires using the BGB from celicatech, and they all check out.

I went to google to see if I could find any info and ran across a web-site with some ecu part numbers. http://www.toysport.com/webpages/WebUpdate...A20ECU20WEB.htm
I found an ecu that had 89661-20760 for the part number and was wondering if there is a difference between this one and the 89661-20750?

I thought mine was right, I thought the part number on the ecu was 89661-20750 but part of the 5 is missing and it isn't really legible. I figured it was right based on the part numbers listed in a thread I found.
JDM 185 ecu's-
89661-20750=89/10-90/03(superceded to 20751)
89661-20751=90/03-91/08
89661-2b310=91/08-92/02
89661-2b280=91/08-93/09

Does anyone know if there is any difference between the ecus with 89661-20760 and 89661-20750, thanks.

This sounds all too familiar. I went through the same thing a few months back. Turns out the ecm that came with my swap was for the wrong year. If you need a new ecm, Ive got one for sale. 89661-2B280 Let me know if you need any help. This might help you

celica wont start

[115celi]

ST185 ecu has pinouts printed on the circuit board.
Remove the cover and compare the pinouts with the one in BGB.

What if there is no pinout on the curcuit board? I checked for this before and I am sure it wasn't there but I'll double check.
DR_Tweak gave me the right pinout for the JDM st185(which I'm sure is what the ecu is out of because we had the whole front clip), and that is how it is wired.

It is there.
If you have 2 boards, you'll need to remove the top one first.

i only have one board and no pinout on my ecu.

Basically, I am middle of a 2nd gen 3sgte swap and my wiring is setup for a 90-91 ecu (pinout from DR Tweak). It cranks but there is no spark. We have checked the igniter, coil, distributor and wires using the BGB from celicatech, and they all check out.

I went to google to see if I could find any info and ran across a web-site with some ecu part numbers. http://www.toysport.com/webpages/WebUpdate...A20ECU20WEB.htm
I found an ecu that had 89661-20760 for the part number and was wondering if there is a difference between this one and the 89661-20750?

I thought mine was right, I thought the part number on the ecu was 89661-20750 but part of the 5 is missing and it isn't really legible. I figured it was right based on the part numbers listed in a thread I found.
JDM 185 ecu's-
89661-20750=89/10-90/03(superceded to 20751)
89661-20751=90/03-91/08
89661-2b310=91/08-92/02
89661-2b280=91/08-93/09

Does anyone know if there is any difference between the ecus with 89661-20760 and 89661-20750, thanks.

This sounds all too familiar. I went through the same thing a few months back. Turns out the ecm that came with my swap was for the wrong year. If you need a new ecm, Ive got one for sale. 89661-2B280 Let me know if you need any help. This might help you

celica wont start

thanks, but i am going to try to find 89661-20750 or 89661-20751 first, otherwise i would need to repin some things. i'll keep it in mind tho.

[WannabeGT4]

You have a 90-91 ECU so if the doc did everything right the wiring should work fine with that ECU wether it's USDM or JDM... You'll just get an EGR code if it's a USDM ECU.

Most if not all 90-91 ECUs don't have the silk screening on the board. The 92-93 ECUs do and they also have the second circuit board.

Have you checked your fuses? Have you tested your coil and are you using the right spark plug wires for the 90-91 3SGTE? Are you getting fuel? What's the part number for your igniter? Have you contacted Dr_Tweak?

[Dr_Tweak]

Did I wire up this harness?

[WannabeGT4]

Did I wire up this harness?

LOL. Oops. I thought you did. I guess you just gave him the ECU pinout.

In that case talk to whoever did your harness. Don't bother Doc Tweak, he's a busy man.

[Dr_Tweak]

LOL I don't know, I think I just gave him the pinouts but I get so many emails, PMs, and harnesses sent to me that I loose track from time to time

-Doc

[toyotacrazy]

any updates?

[x_itchy_b_x]

i have a 93 jdm 3s and its ecu only has one board and no silk screen pin lables.
but heres some good pinouts.

http://mr2oc.com/showthread.php?t=157628

[CilverSeliST205]

If it turns out that you have a good ecu and wiring, check your igniter's ground connection (igniters bracket) and make sure that it gets good ground - mine had a thin layer of rustage and that made my car crank over with no spark

[brianforster]

also check EFI fuse in the engine bay

[zipstrips]

also check EFI fuse in the engine bay

damn that fuse!...

checkk the ST fuse under your dash too!!!!!!!!!!!!!1

[115celi]

If it turns out that you have a good ecu and wiring, check your igniter's ground connection (igniters bracket) and make sure that it gets good ground - mine had a thin layer of rustage and that made my car crank over with no spark

Thanks, this fixed my spark issue, but it still won't start.

I am getting codes 22,24,31,32,41 and 51. I am going to trouble shoot those sensors tomorrow before work.
Anyone have any ideas? Thanks alot for all the help.

[lagos]

it sounds like you forgot to hook up your afm, water temp sensor, throttle position and speed sensor. you did get an afm with your motor, right?

[toyotacrazy]

If it turns out that you have a good ecu and wiring, check your igniter's ground connection (igniters bracket) and make sure that it gets good ground - mine had a thin layer of rustage and that made my car crank over with no spark

Thanks, this fixed my spark issue, but it still won't start.

I am getting codes 22,24,31,32,41 and 51. I am going to trouble shoot those sensors tomorrow before work.
Anyone have any ideas? Thanks alot for all the help.

Do you have the correct ecm for the engine? And was it wired using the correct wiring diagram?

JDM 185 ecu's-
89661-20750=89/10-90/03(superceeded to 20751)
89661-20751=90/03-91/08
89661-2b310=91/08-92/02
89661-2b280=91/08-93/09

[CelicaSTX02]

Hmmm........this can possibly be my issue too!!! If only there was someone working on my car, I am so far away from it right now that I can't just go work on it myself =[

[115celi]

Now I am really confused. I did a trouble shoot to figure out why I was getting those codes and all of the sensors are good, the wiring checks out and the ecu should be good(unless I have two bad ecus, becaues they both pop the same codes).
I am out of ideas. Even with those codes the enigne should try to turn over wouldn't it? Is there anything else I should check to get ride of the codes?

[alltracman78]

Check your E2 wire. It's brown.
It supplies the source voltage for all those sensors.
I'm surprised you don't have a MAP sensor code too.

i have a 93 jdm 3s and its ecu only has one board and no silk screen pin lables.

If you're going by the part# on the case, someone probably swapped a cover or case on you.
There's a reason the 92^ have 2 circuit boards. There is a more sensitive second diagnostic mode on those ECUs. Which is the reason for the second board.
It's not a some do some don't like the 7 vs 9 hole exhaust manifolds, ALL 92^ ECUs have them.
So does the 5SFE for that matter.

[x_itchy_b_x]

Check your E2 wire. It's brown.
It supplies the source voltage for all those sensors.
I'm surprised you don't have a MAP sensor code too.

i have a 93 jdm 3s and its ecu only has one board and no silk screen pin lables.

If you're going by the part# on the case, someone probably swapped a cover or case on you.
There's a reason the 92^ have 2 circuit boards. There is a more sensitive second diagnostic mode on those ECUs. Which is the reason for the second board.
It's not a some do some don't like the 7 vs 9 hole exhaust manifolds, ALL 92^ ECUs have them.
So does the 5SFE for that matter.

im pretty sure it's a 93. i was basing that off of the fact that i have a 9 stud manifold and the plug wires.
my ecu code is 89661-20750=89/10-90/03(superceded to 20751), and i bought the engine in a front clip
I can assure you the ecu/cover wasn't swapped, the screws i removed from there had no signs of even having a screw driver in them. Wait, so if thats the case, did i buy a 91 that had a 93 head put on it....

[alltracman78]

im pretty sure it's a 93. i was basing that off of the fact that i have a 9 stud manifold and the plug wires.
my ecu code is 89661-20750=89/10-90/03(superceded to 20751), and i bought the engine in a front clip
I can assure you the ecu/cover wasn't swapped, the screws i removed from there had no signs of even having a screw driver in them. Wait, so if thats the case, did i buy a 91 that had a 93 head put on it....

C'mon man.
I'm really not trying to be a dick. I promise. If I come across that way I apologize.
But you just posted the production date of your ECU, and yet you're trying to tell me it's a 93?
Did you not realize that was the production date?

Plug wires/cap are no indication.
They are easily changed.
The 9 hole manifold is less likely to have been swapped. But since the 90/91 heads had all 9 stud holes, it isn't that hard to do.

That or someone swapped ECUs in the clip.
It's happened before. I don't know why in a regular ST185 [I could see an RC], but that ECU part # is from an EARLY ST185. From the first 5 months of production.

[x_itchy_b_x]

no im agreeing with you lol. im saying damn i thought it was a 93 all along until now
I took for face value that it was a 93 because thats what the importer said.
I didn't even bother to justify it until this ecu code just showed me that it wasnt a 93.
I appreciate you and your knowledge, trust me

Wait, so if thats the case, did i buy a 91 that had a 93 head put on it....

that wasn't ment to be sarcastic, that was me coming to terms with owning a 91 3sgte

This post has been edited by x_itchy_b_x: Mar 18, 2007 - 2:55 PM

[alltracman78]

Cool man.

I think sometimes I end up coming across as a dick when I don't mean to.
Just wanted you to know I wasn't trying to.