ST185, SWAP ECU and Code error 54

Write ups and tutorials for maintenance and modifications.

Re: ST185, SWAP ECU and Code error 54

Postby Locker » Thu Nov 05, 2015 1:27 pm

Gibs wrote:
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.


I believe your thinking too much. This is a SUPER easy fix for the 185RC.
All you need to do is snip the INT wire. then ground the wire from the ECU side of the harness.
Members don't see the above ad. Register now - it's free!
90 ST185
Locker
Club Member
 
Posts: 564
Joined: Wed May 25, 2005 9:41 pm
Location: Barrie, ON

Re: ST185, SWAP ECU and Code error 54

Postby Gibs » Thu Nov 05, 2015 5:18 pm

Locker wrote:
Gibs wrote:
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.


I believe your thinking too much. This is a SUPER easy fix for the 185RC.
All you need to do is snip the INT wire. then ground the wire from the ECU side of the harness.


hehe thanks for your help. :notworthy:
I think we never think too much. :roll:

Since the beginning I'm talking about the CS mod and you are talking about the RC.
I did the conversion 10 years ago, and at the time a friend did it before me and his fix was to remove the check engine bulb (in his car) :)

So now, I want to fix it properly.
I admit, I did not snip the INT wire. I just put it to the GND. The reason is that it my intercooler is not managed by the ECU anymore : when I start the car it runs until I stop the car.

I also own a Japanese ECU (the RC one), and from what I remember It doesn't report the code 54 without any tricks. The reason I don't use the RC one is because I think it is better to run with an european ECU (no need to raise the octane %).

So even if the car is running correctly there are still pinouts that doesn't match.

Image

Also the 26 & 16 pins harness is from the CS, while the 22 pins is from the car. Maybe there's something to do with the WIN pin...

Can you confirm that my INT pin is this one ?

Image
Gibs
Newbie
 
Posts: 14
Joined: Fri Oct 30, 2015 11:38 pm

Re: ST185, SWAP ECU and Code error 54

Postby underscore » Thu Nov 05, 2015 7:23 pm

If you want to confirm the pinout I believe Toyota usually labels the pins on the PCB inside the ECU case.
★ 1991 GTFour RC ~ "Rebel Scum" ★
It's for sale! http://www.alltrac.net/phpBB2/viewtopic.php?f=64&t=52181
Build thread http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=44216
underscore
GTFour God
 
Posts: 3821
Images: 0
Joined: Mon Apr 09, 2007 11:29 pm
Location: Kelowna, BC

Re: ST185, SWAP ECU and Code error 54

Postby Locker » Fri Nov 06, 2015 1:05 am

Gibs wrote:Can you confirm that my INT pin is this one ?

Image


from what I can tell that is the right PIN. it was a pink wire in my car with a stripe I believe.....
I'm no electrical guru. I was shown the pin out diagram told to cut the INT wire and ground it and boom no light and the car no longer ran in limp mode.
90 ST185
Locker
Club Member
 
Posts: 564
Joined: Wed May 25, 2005 9:41 pm
Location: Barrie, ON

Re: ST185, SWAP ECU and Code error 54

Postby Gibs » Fri Nov 06, 2015 4:54 pm

Locker wrote:
Gibs wrote:Can you confirm that my INT pin is this one ?

Image


from what I can tell that is the right PIN. it was a pink wire in my car with a stripe I believe.....
I'm no electrical guru. I was shown the pin out diagram told to cut the INT wire and ground it and boom no light and the car no longer ran in limp mode.


Locker wrote:I've grounded the WIN pin.... that's why I'm confused... I must be missing something. I read somewhere about wiring 2 resistors in parallel at the pump but I thought grounding the WIN pin eliminated the need for that?


Ok, in the thread you have opened you're also talking about the WIN wire.
Did you kept the WIN pin grounded also ? Thanks
Gibs
Newbie
 
Posts: 14
Joined: Fri Oct 30, 2015 11:38 pm

Previous

Return to How To

Who is online

Users browsing this forum: No registered users and 2 guests