ST165 to ST185 ECU Conversion

Talk EMS and Computer related performance

Postby siralys » Fri Apr 24, 2009 12:36 am

Ok so I have a 165 and want to run the 185 ecu. I know someone with an uncut jdm 185 harness and ecu, if I got the full 185 harness couln't I just put that in instead of getting an adapter harness?
Members don't see the above ad. Register now - it's free!
2003 hyundai santa fe- daily driver
1995 vw passat vr6- modded wagon- sold
1988 celica alltrac- in parts finding mode
siralys
Club Member
 
Posts: 289
Joined: Sun Jun 08, 2008 5:43 pm
Location: Riegelsville, Pa- now KOP

Postby aubeone » Fri Apr 24, 2009 12:44 am

Yes and no.

The plugs arent the same on the engine, so you would have to change them all over.

In your case I would just adapt the harness for the ecu.
Parting Out an 88 ST165
Parts Available:
JDM Gen2 3SGTE w/ converted harness and Gen2 ECU
New suspension and brakes
Full Black Leather Interior (both front seats with pwr lumbar)

Contact for details.
aubeone
Club Member
 
Posts: 476
Joined: Mon Jul 28, 2008 2:07 pm
Location: Little Britain, ON

Postby xCH121Sx » Tue Jun 23, 2009 5:18 am

i got a hold of a trashed gen 2 harness from a friend. so i have the male plugs for the ecu.

i was thinking. everyones adapters are just in case their wiring was bad they can revert back to the 165ecu.

no ones had problems so far.

i was thinking since i dont have the female part of the ecu that i could solder new plugs directly to the 165 harness.

anyone see why i shouldnt do this?
User avatar
xCH121Sx
Club Member
 
Posts: 150
Joined: Sun May 20, 2007 9:20 am
Location: Socal. Buena Park

Postby aubeone » Tue Jun 23, 2009 11:50 am

In all honesty, after completing the adapter and mounting everything I ended up just swapping the plug ends anyway...I found the adapter took up way to much space in an narea where space is already a non-existent commodity.

Quick question also:

Has anyone come accross the situation in their swaps where there doesn't appear to be a match for the coldstart signal (STJ)??? Both the original 165 harness that I am using and the JDM 185 engine have cold start valves, but the ecu for the engine doesn't have an STJ signal/pin/wire....any ideas?
Parting Out an 88 ST165
Parts Available:
JDM Gen2 3SGTE w/ converted harness and Gen2 ECU
New suspension and brakes
Full Black Leather Interior (both front seats with pwr lumbar)

Contact for details.
aubeone
Club Member
 
Posts: 476
Joined: Mon Jul 28, 2008 2:07 pm
Location: Little Britain, ON

Postby Dr Tweak » Tue Jun 23, 2009 2:57 pm

JDM ECUs don't have an STJ pin.

-Doc
-Dr Tweak, Toyota Engine Swap Wiring Expert Extraordinaire
http://www.phoenixtuning.com/
Dr Tweak
Club Member
 
Posts: 80
Joined: Tue Jun 14, 2005 8:07 am
Location: USA

Postby aubeone » Tue Jun 23, 2009 4:51 pm

Noted, again...how would one wire the cold start injector then? Or do you just skip it all together?

I guess what I am looking for is guidance. What is the appropriate way to wire in the cold start on a jdm (185) engine with a usdm (165) harness?
Parting Out an 88 ST165
Parts Available:
JDM Gen2 3SGTE w/ converted harness and Gen2 ECU
New suspension and brakes
Full Black Leather Interior (both front seats with pwr lumbar)

Contact for details.
aubeone
Club Member
 
Posts: 476
Joined: Mon Jul 28, 2008 2:07 pm
Location: Little Britain, ON

Postby Dr Tweak » Tue Jun 23, 2009 5:08 pm

It's not really a big deal, the injector is turned on by the switch. On our harnesses I have the wire there in case a USDM ECU is being used, otherwise it isn't used at all.

-Doc
-Dr Tweak, Toyota Engine Swap Wiring Expert Extraordinaire
http://www.phoenixtuning.com/
Dr Tweak
Club Member
 
Posts: 80
Joined: Tue Jun 14, 2005 8:07 am
Location: USA

Postby aubeone » Tue Jun 23, 2009 5:12 pm

Perfect.

So if I leave it alone, it'll do it's thing?

Thank you.
Parting Out an 88 ST165
Parts Available:
JDM Gen2 3SGTE w/ converted harness and Gen2 ECU
New suspension and brakes
Full Black Leather Interior (both front seats with pwr lumbar)

Contact for details.
aubeone
Club Member
 
Posts: 476
Joined: Mon Jul 28, 2008 2:07 pm
Location: Little Britain, ON

Postby All4Traction » Sat Sep 26, 2009 4:59 am

Cool to see this thread is still alive.
Honestly, this was years ago and a lot of it is jibberish to me again. :(
Miss my car, hope this has helped a few people get their cars running good on the road :)
Paul S.-
89 Celica Turbo 4WD- Jdm ST-185 swap, CT20B turbo, ST205 A2W I/C....
http://turbo4wd.topcities.com/
All4Traction
Club Member
 
Posts: 223
Joined: Thu Feb 24, 2005 12:47 am
Location: Saskatchewan

Postby Rick89GTS » Sat Sep 26, 2009 5:58 am

Paul, buy another 165! :wink:
User avatar
Rick89GTS
GTFour God
 
Posts: 3747
Joined: Sun Aug 08, 2004 6:28 am
Location: Great White North, Canada

Re:

Postby jingo11 » Mon May 31, 2010 10:35 am

MXP_57 wrote:Hi, i'm cedric from perth, australia.

I ve got a st165 jdm with a st185 jdm engine. but was still running with the st165 ecu and loom.

I needed to swap to the st185 ecu because 1987 st165 jdm doesn't have fuel cut based on pressure from the PIM. It's measured with the air flow. So i cannot boost more than 10 psi.

I plugged everything. The car start, but the air fuel ratio is lean, and there is black coming out of the exhaust when i accelerate. I didn't test drive, just idle. Code error 32 ( open circuit on E2 or short between vc and vs.)

Could you tell me how did you do to plug FC and OX2 ?
Could it be because there s nothing plugged in PIM?

Thank you very much for your help, i 'm a bit stuck...

:wink:


Did you sort this...as i have the same ECU with no PIM etc and am in process of converting to a link g3 ecu though need to convert ot MR2 ecu wiring plugs due to connectoors... most done but any elp appreciated Image

Jingo
User avatar
jingo11
Club Member
 
Posts: 28
Joined: Tue Dec 02, 2008 11:37 pm
Location: West Sussex, UK

Re: ST165 to ST185 ECU Conversion

Postby xeril » Sun Dec 05, 2010 8:03 am

So, I have a AEM EMS on its way and I've been looking at this. This appears to be how it should be wired up (according to the standard pin-outs I've seen on diagrams and what AEM seems to believe the standard wiring is for a 90/91 ST185 ecu.)

Image

I haven't been able to find anyone else using an AEM EMS on an ST165 block so I guess I'll let you all know the outcome, though I don't see any reason why it shouldn't work.

Image

This appears to be the price list to for connectors to make TWO (2) harnesses for a ST165 (52 pin female plug) --> ST185 (3 male plugs 26, 16, 22 pins) ecu from http://www.onlinecomponents.com. They offer a minimum order of 35$, so they add money to bring the cost to 35$ if your order doesn't contain that much in parts, so you might as well order two sets.
Image
xeril
Club Member
 
Posts: 72
Joined: Wed Sep 22, 2004 1:30 am
Location: Fairfax, VA

Re: ST165 to ST185 ECU Conversion

Postby 3-S-G-T-E » Wed Nov 28, 2012 1:12 pm

old thread revival!!! I have just purchased an old st165 rally car, which campaigned in Group N in the UK in the early 1990s.

Image

Image

It currently has an st165 ECU/AFM and loom with an st185 engine. I have an ST185 RC ECU/AFM which I want to use in the car with the st165 loom - is this possible??? Anybondy know what do I do about the lack of FC on the 165 loom and different AFM connections??

Thanks, Andrew
3-S-G-T-E
Newbie
 
Posts: 3
Joined: Wed Jan 11, 2012 8:09 am

Re: ST165 to ST185 ECU Conversion

Postby xeril » Tue Dec 18, 2012 8:43 am

Ahhh thats right, FC is the fuel pump relay (I believe). You could just do the always on fuel pump mod by jumping the two terminals in the diagnostics box under the hood.

I would assume you could find a connector that fits the 185 MAF from some car in a junk yard and cut/solder that plug on in and use it..

Then you'd have to go through the hassle of getting the connectors to use for the ecu and rewire that. Theoretically it should all work; however, I ended up needing cash and selling my AEM back in the day so I never got to try out. Good luck!
Image
xeril
Club Member
 
Posts: 72
Joined: Wed Sep 22, 2004 1:30 am
Location: Fairfax, VA

Previous

Return to EFI Corner

Who is online

Users browsing this forum: No registered users and 4 guests