Using a '93 3SGTE ECU on a '91 3SGTE Engine and Harness Options

[Dr_Tweak]

Some weeks back I had a customer doing a 3SGTE swap into a '91 Celica that I did a wiring conversion for. After he got it back and installed, I asked him for the part number on his ECU since I've seen many situations where the importers send the wrong ECU for the year of the harness. Sure enough, he had a '91 Harness but a '93 ECU. I advised him to get a '91 ECU, but he was having a hard time locating one.

About the same time, I started gathering parts and doing research for making jumper harnesses for various Toyota applications. I located the supplier for the female ECU plugs for a few different Toyota harnesses. When I got one in that matched the 3SGTE harnesses, I though, why not make a jumper harness that goes from a '91 harness to a '93 ECU, or a '93 harness to a '91 ECU? Then customers who run into this situation don't have to find another ECU or repin the whole harness.

Since I had this customer, Bryant, who had this very situation at hand, and since I happened to be going near where he lived on a recent road trip, I decided to whip up a prototype and give it a try.







There it is plugged into a 3SGE ECU as an example. This first one came out a little rough, the production model will be cleaner.

And here it is plugged into the car:



The jumper harness worked PERFECTLY. It fired up the first try and is running great, no codes and no problems at all

If anyone wants one of these jumper harnesses let me know, I'm currently building them to order.

Other applications for this setup include plug and play jumper harnesses for standalone units that don't already have a plug and play setup, like perhaps 3SGTE/Autronic, and so on.

-Doc

[presure2]

nice work tweek.

[toyotacrazy]

Thats cool you are doing this. I was one of the people that had the wrong ecu. I was trying to locate someone with connectors for doing exactly what you have there. But I had no such luck. I got lucky and found an ecu. Great work!

[Punch]

just when you think he couldnt do anything better .....
HE DOES!
GOOD WORK DOC!
Whats next jumber harness for piggy backs...
keep up the good work...

[Dr_Tweak]

Thanks guys

Now that I have access to these female ECU plugs, if you guys have any other ideas for what they could be used for, just let me know and I'll see what I can make for you

-Doc

[Rayme]

I love your soldering skills

[Dr_Tweak]

$199, in stock, if you want one, email me at drtweak@phoenixtuning.com

-Doc

[pittfirefighter]

i have a 92 ecu with a blown 92 block and crank... so i picked myself up a 93 longblock and am going to use its block and crank and pistons... am i going to have any trouble with the knock sensor between the two or any other problems?? i wouldn't need something like that since i'm using a 92 head and everything else?

[lagos]

thats some nice work! now get started on a 3sgte to 6th gen version.
btw, what company did you outsource to make these for you?

This post has been edited by lagos: Dec 27, 2007 - 1:49 PM

[Supersprynt]

You know what I'd like, ST185 -> ST205 ecu.

This post has been edited by Supersprynt: Dec 27, 2007 - 6:58 PM

[Dr_Tweak]

thats some nice work! now get started on a 3sgte to 6th gen version.
btw, what company did you outsource to make these for you?

Not allowed to say

You know what I'd like, ST185 -> ST205 ecu.

Yeah actually I can do that for you, what year is the ST185?

[Supersprynt]

I have a 92. I am sorta thinking out loud, but it would be great to put that in and get rid of the AFM.

[jgreening]

I have a 92. I am sorta thinking out loud, but it would be great to put that in and get rid of the AFM.

I thought about this at one time and then did a little research to see what was involved. Suffice it to say, it doesn't really make economic sense.

Gen II to Gen III ECU Swap Thread

[Supersprynt]

Hmm, yes I understand. Stand alone much more worth it.

[BloodyStupidDave...]

Suffice it to say, it doesn't really make economic sense.

Gen II to Gen III ECU Swap Thread

Please could you summarise what is in that thread for those that aren't members on that board?

This post has been edited by BloodyStupidDavey: Dec 28, 2007 - 5:54 AM

[Supersprynt]

Well if you can't inference it from what we've both said, it's quite expensive to find all the parts necessary to make it work, around $1,000. So it would be much more worth it to apply that to a much more useful stand-alone EMS.

[jgreening]

Suffice it to say, it doesn't really make economic sense.

Gen II to Gen III ECU Swap Thread

Please could you summarise what is in that thread for those that aren't members on that board?

Erik answered your question. I post here to encourage you to sign up for an account at mr2oc.com. If you want good 3sgte information, that is the best source, IMO.

[Dr_Tweak]

I have a 92. I am sorta thinking out loud, but it would be great to put that in and get rid of the AFM.

I can easily put one together for you. You can do it for a pretty fair price if you shop around for parts, and there's nothing like having a stock ECU running your engine. We work on a lot of cars that are running standalones or piggybacks and it seems like the headaches never end.

One thing you would need is an MSD RPM-activated switch to control the TVIS.

-Doc

[lagos]

I thought about doing this in the past, but like jay said, it almost doesn't seem worth the cost.

You would need:

205 ecu (pricey and hard to find)
550cc injectors
igniter
map sensor
air intake temp sensor
intake manifold temp sensor w/ adapter
tvis rpm switch

You could also just repin your harness to make it work. It fairly simple to do, but the adapter harness would be nice in case you need to go back to the stock ecu.

Since the only real benefit to doing this would be to convert to a map based system, you could make it more simple by just buying a used vpc.

This post has been edited by lagos: Dec 29, 2007 - 6:02 AM

[WannabeGT4]

I was curious about the mark up on this so I did a little research. These are the part numbers and prices from Toyota:

26 Pin Connector
90980-11390 $5.09
?alt?90980-11423 $5.09 ?alt?

22 Pin Connector
90980-11392 $5.06
?alt? 90980-10765 $5.66 ?alt?

16 Pin Connector
90980–11391 $5.07

Not 100% sure about this one since it didn't have a picture:
PCB Connector 64 pin
90980-11576 $8.52

The terminals that go inside each connector are easily obtainable from places like mouser.com or digikey for pennies a piece. The terminals with wires pre-crimped are also available from Toyota but without some in front of me I couldn't tell which ones they were.

The $199 price tag must be in the time it takes to assemble... which, with the proper tools shouldn't take too long at all. You've got a very profitable product there Dr. Tweak, as long as there is a demand for it.