Help understanding the gt4dc citcuit for code 54

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Postby CMS-GT4 » Wed Mar 07, 2007 10:54 pm

That may be the case. At idle check, the ecu thinks things are fine its just when the INT runs its check, I get a fault. Wonder if there is a way I can just remove the circuit from the ecu.
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Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Postby WannabeGT4 » Thu Mar 08, 2007 12:04 am

I bet if you open the ECU and trace INT back to the processor you'll find a burnt resistor or transistor somewhere along the way. Replace that/them and try it again.
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Postby CMS-GT4 » Thu Mar 08, 2007 12:43 am

I really do not have time to fix this. I may just have to buy ANOTHER ecu or something. I sort of wish I kept the mr2 one I bought. I bet it has been a burned out INT this whole time... I wasted a lot of time working on this.
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Postby CMS-GT4 » Mon Mar 12, 2007 2:23 pm

I have another ecu on the way.

I am going to try this again when it gets here.

One quick question. Do I need to filter the 12v signal that goes to the INT of the ecu to reudce the 12v strength?
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Postby WannabeGT4 » Mon Mar 12, 2007 2:33 pm

CMS-GT4 wrote:I have another ecu on the way.

I am going to try this again when it gets here.

One quick question. Do I need to filter the 12v signal that goes to the INT of the ecu to reudce the 12v strength?


That is the function of the relay's coil.
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Postby CMS-GT4 » Mon Mar 19, 2007 9:21 pm

I followed this method.

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Car runs fine. I now get 9-10psi.
Error code is gone, but the light bulb from the circuit still does not light up. I hear the relay kick on when it does a pump check. Rock and roll. I test drove it. Pulls pretty well. I think it will pull even better once I install my boost guage. :evil:
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Postby WannabeGT4 » Mon Mar 19, 2007 9:27 pm

CMS-GT4 wrote:I followed this method.

Image

Car runs fine. I now get 9-10psi.
Error code is gone, but the light bulb from the circuit still does not light up. I hear the relay kick on when it does a pump check. Rock and roll. I test drove it. Pulls pretty well. I think it will pull even better once I install my boost guage. :evil:


Glad to here that got it working. Wanna send me your fried ST205 ECU ;).
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Postby CMS-GT4 » Mon Mar 19, 2007 10:54 pm

Thanks, but I think I am going to keep it and fix it as a backup.
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Re: Help understanding the gt4dc citcuit for code 54

Postby aus jd 2703 » Mon Aug 23, 2010 6:26 am

ok so im bringing this thread back to life lol
which is a better idea using this fix and hard wiring the pump or running the extra wires and wiring it to the ecu as toyota did?
im not sure which i rather do.
im putting a jap 205 into and australian st18 if it matter, and i plan t use the 205 ecu intercooler and water pump
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Re: Help understanding the gt4dc citcuit for code 54

Postby CMS-GT4 » Mon Aug 23, 2010 2:09 pm

If you have all the plugs and wiring from the 205 harness, then its not a bad idea to run the wiring as it would be stock. You do loose the option of constantly running pump though if you go that route.
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92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re: Help understanding the gt4dc citcuit for code 54

Postby lalojamesliz » Sat Oct 09, 2010 6:43 am

Hey guys I also did The gen3 electronics swap on my 91 all-trac and I'm using a gen3 mr2 ecu. I also have a st205 ecu that I want to use and I just bought the relay and some 1/4 watt 1k ohm resistors and some 1/2 watt 1k ohm resistors because I wasn't sure on what wattage to use. Would they both work or should I use the 1/4 or 1/2 watt? Also if I get rid of the code 54 with these things do I have to worry about the resistors or relay failing on me while driving? I have AAA towing but I don't want to jave to use it lol. Thanks guys
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Re: Help understanding the gt4dc citcuit for code 54

Postby CMS-GT4 » Tue Jun 14, 2011 4:13 pm

I still wonder if the whole function might be removed from the ecu.
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re:

Postby belanger33 » Thu Apr 12, 2012 8:43 pm

CMS-GT4 wrote:I followed this method.

Image

Car runs fine. I now get 9-10psi.
Error code is gone, but the light bulb from the circuit still does not light up. I hear the relay kick on when it does a pump check. Rock and roll. I test drove it. Pulls pretty well. I think it will pull even better once I install my boost guage. :evil:


Bringing back this thread alive since i just did a gen3 conversion on my st185 RC and im getting code 54... To make sure , id like to recapitulate what i need exactly.... I need 2 1k resistors that i place at the ecu where the diagram shows it. Then i bridge the LEV sensor at the intercooler. Do i need to
Do something at the intercooler pump? ... Thanks for the clarification!
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Re: Help understanding the gt4dc citcuit for code 54

Postby CMS-GT4 » Thu Apr 12, 2012 8:54 pm

What intercooler pump are you using? Did you wire it to run all the time? Did you ditch the oem IC computer? The RC setup is a little different than the 205, so we need to know all you changed. Since this is an RC, if you still have the wta IC you can likely run a wire from the LEV to the sensor and still have it operate. If not, then you need to ground it at the ecu.
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
www.noritoy.com | noritoy.deviantart.com | http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=19891
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Re: Help understanding the gt4dc citcuit for code 54

Postby belanger33 » Fri Apr 13, 2012 12:05 am

I have the RC WTA stock setup on with the stock pump on....i didn't do the job personnally so im not quite sure if i still the IC ECU. Is it situated at the same place the normal ECU is...Right now i did not ground anything and im just driving temporary with the code 54 error...
Is that enough info for you to help...
Thanks again!
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