Help understanding the gt4dc citcuit for code 54

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Help understanding the gt4dc citcuit for code 54

Postby CMS-GT4 » Wed Oct 25, 2006 5:39 pm

I am trying to sort this out but have some questions.
Here is the link.
http://www.gt4dc.co.uk/website/howtos/st205_code54.php

They use resistors to solve the problem. I am trying to do this at the ecu. Can anyone verify what B and E are on the diagram? I think they are ground and power.

And can you tell what colors are on the diodes? I thought I had this hooked up right with a 1k ohm, but still threw a code 54.

thanks,
JC
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Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Postby CMS-GT4 » Thu Oct 26, 2006 1:28 am

bump, help?
Coldiron
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Postby Mafix » Thu Oct 26, 2006 1:52 am

seems that they may be a power and ground...also looks like you can just wire a 1kohm resistor between the 2 and it'll work fine. i'm sure one of those is ground and the other perhaps is a check value positive line for the ecu.
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Postby Gary » Thu Oct 26, 2006 11:54 am

If you are doing this at the ECU, just putting the resistor between E and B will not eliminate code 54.
You have to join E, M and M+ together and hook them with a 1k ohm resistor.
Connect that 1k ohm resistor to the IC relay (or any power wire)
Also, you will need another 1k ohm resistor between that IC relay wire (or any power wire) and the MTT.

See this diagram:
Image
93 ST185
Image
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Postby CMS-GT4 » Thu Oct 26, 2006 7:31 pm

Thanks gary. I may have done it wrong. I spliced into the ground, and the ecu power then to the m+ m= and mtt wires. I had two resistors hooked up. It looked just like their diagram but for e and B I used ground and ecu power. So, your saying I use the IC relay instead?
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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Postby CMS-GT4 » Thu Oct 26, 2006 8:59 pm

Here is a pic of what I had out of the ecu.

Image
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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Postby Mafix » Thu Oct 26, 2006 9:00 pm

yeah that doesn't look right.
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Postby CMS-GT4 » Fri Oct 27, 2006 12:13 am

So is E ground?
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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CMS-GT4
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Postby Gary » Fri Oct 27, 2006 12:43 am

One thing that isn't right is you can't use diodes.
You will need resistors. (1k ohm is brown-black-red)
Diode is used to control direction of the current, which is not in this case.
Another thing is that doesn't look anything like the write up. :P
But yes, according to them, E is grounded.

Image
93 ST185
Image
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Postby CMS-GT4 » Fri Oct 27, 2006 1:23 am

Thanks gary. I meant resistors. I got some 1k I just need to make sure my colors match yours.
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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CMS-GT4
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1992 Toyota Celica

Postby CMS-GT4 » Fri Oct 27, 2006 2:43 am

Does it matter what the 4th color is? Mine is gold.
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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CMS-GT4
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1992 Toyota Celica

Postby Gary » Fri Oct 27, 2006 4:00 am

It doesn't matter on this type of circuit.
The forth stripe represents the tolerance of the resistance.
Gold is +/- 5%
Silver is +/- 10%
None is +/- 20%
93 ST185
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Postby CMS-GT4 » Sat Oct 28, 2006 8:01 pm

If I ever get to meet you gary, I will give you a big kiss!! That fixed both my codes. Thanks gary!
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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CMS-GT4
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Postby Gary » Sat Oct 28, 2006 8:10 pm

A big thank will do.
Keep the kiss for Kris Carter at GT4DC who wrote that page.
:D
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Postby CMS-GT4 » Sat Nov 04, 2006 4:58 pm

Well I have a new problem. The code is off as long as the car idles. As soon as I revi it, it thrrows a code 54. Could it be something is either shorting out, or the resistors are not enough under more load?
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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CMS-GT4
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1992 Toyota Celica

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