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ST185, SWAP ECU and Code error 54

Sun Nov 01, 2015 5:22 pm

Hello to all Celica technicians and the others :)

I own a 1990 ST185 converted into a CS (gearbox, hood, intercooler + pump, fans and ECU).
The fuel pump is running permanently and of course like many guys here I got a Code 54 from the ECU.

I have read many threads about the code 54 here, but they are quite old and most of the time, the attached pictures aren't available anymore. So I have opened a new thread.

So, I would like to fool the ECU for not reporting the code 54 anymore to avoid the Check Engine light on the dashboard.

Thanks
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Re: ST185, SWAP ECU and Code error 54

Sun Nov 01, 2015 10:27 pm

You ground one of the pins from the ECU.
INT? I don't remember off the top of my head.
I do know the US wiring harness has a bare space there.

I always grounded it to the stud the ECU mounting bracket attached to.

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 1:41 am

viewtopic.php?f=21&t=50950

I just went through the same problem. Ground the int wire. There is a pin-out diagram in the thread

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 4:57 am

Locker wrote:http://www.alltrac.net/phpBB2/viewtopic.php?f=21&t=50950

I just went through the same problem. Ground the int wire. There is a pin-out diagram in the thread

Thanks guys.

Did you do that inside the CPU or have you cut the wire from the ECU connector ?

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 12:15 pm

just snip the wire and ground the wire coming out of the ECU

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 3:08 pm

I had the same problem code54, thread has all my info and pics. Worked for me
http://www.6gc.net/forums/index.php?showtopic=90820&hl=

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 8:20 pm

mgnt232 wrote:I had the same problem code54, thread has all my info and pics. Worked for me
http://www.6gc.net/forums/index.php?showtopic=90820&hl=


Thanks.
So wich relay do I need ?

Do you have a picture of the mod done ? :D

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 8:43 pm

Gibs wrote:
mgnt232 wrote:I had the same problem code54, thread has all my info and pics. Worked for me
http://www.6gc.net/forums/index.php?showtopic=90820&hl=


Thanks.
So wich relay do I need ?

Do you have a picture of the mod done ? :D


The relay fix is only for those running a st205. If you've done the St185 RC swap you only need to ground the INT wire. I went through this headache not 2 weeks ago...

Re: ST185, SWAP ECU and Code error 54

Mon Nov 02, 2015 10:49 pm

Locker wrote:
Gibs wrote:
mgnt232 wrote:I had the same problem code54, thread has all my info and pics. Worked for me
http://www.6gc.net/forums/index.php?showtopic=90820&hl=


Thanks.
So wich relay do I need ?

Do you have a picture of the mod done ? :D


The relay fix is only for those running a st205. If you've done the St185 RC swap you only need to ground the INT wire. I went through this headache not 2 weeks ago...

Oh yeah sorry gotcha, ST185 is different. disregard for you lol, it is how you do it on a 3rd gen st205 though

Re: ST185, SWAP ECU and Code error 54

Tue Nov 03, 2015 3:13 am

Locker wrote:
Gibs wrote:
mgnt232 wrote:I had the same problem code54, thread has all my info and pics. Worked for me
http://www.6gc.net/forums/index.php?showtopic=90820&hl=


Thanks.
So wich relay do I need ?

Do you have a picture of the mod done ? :D


The relay fix is only for those running a st205. If you've done the St185 RC swap you only need to ground the INT wire. I went through this headache not 2 weeks ago...

Thank you very much. Now it's clear :)

Re: ST185, SWAP ECU and Code error 54

Wed Nov 04, 2015 7:19 pm

So I own the Carlos Sainz ECU.

Based on this information,
Image

My INT pin should be here :
Image

The INT pin should be there:
Image

And is grounded there
Image

But the Check Engine is still lightning...
While removing the ECU I have disconected the ground from the battery.
Should it be enough to reset the ECU ?

Or maybe I have grounded G- instead of INT ?

Thanks

Re: ST185, SWAP ECU and Code error 54

Wed Nov 04, 2015 7:48 pm

Locker wrote:The relay fix is only for those running a st205. If you've done the St185 RC swap you only need to ground the INT wire. I went through this headache not 2 weeks ago...


I have done the ST185 Carlos Sainz ECU swap.
The RC ECU is a bit different.
Source: http://hohneckr.awardspace.com/celicapr ... inouts.htm

Re: ST185, SWAP ECU and Code error 54

Wed Nov 04, 2015 8:41 pm

I'm not sure what to tell you.
I grounded the INT and my check engine light went off. It was an ST185RC. its a pink wire.....
I'm not sure why you opened up the ECU

Re: ST185, SWAP ECU and Code error 54

Wed Nov 04, 2015 8:45 pm

Locker wrote:I'm not sure why you opened up the ECU


To do the mod inside the ECU. (I have no electricity to solder in my garage).
So I took the ground of the ECU.

Re: ST185, SWAP ECU and Code error 54

Thu Nov 05, 2015 12:48 am

alltracman78 wrote:You ground one of the pins from the ECU.
INT? I don't remember off the top of my head.
I do know the US wiring harness has a bare space there.

I always grounded it to the stud the ECU mounting bracket attached to.


.
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