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Understanding ETC (electronic throttle control) map

PostPosted: Tue Apr 08, 2008 1:43 pm
by ETC
Hello,

I hope I can find some help with my problem here. I am looking on the ETC map of a Nissan VQ35 engine but can not make sense of it.

The cell values raise and the only thing I know for sure is that the vertical axis is rpm. I do not know what the horizontal axis is and what the cell values represent.

Does anyone have any info on Denso ETC mapping?

Thank you.

PostPosted: Wed Apr 09, 2008 6:09 pm
by Freon
Do you have a map we can look at?

PostPosted: Thu Apr 10, 2008 2:19 am
by ETC
Oh, of course... here you go! As you can see there is a primary and a secondary ETC map.

PostPosted: Thu Apr 10, 2008 1:05 pm
by Freon
Can you not post the ROM file? I'd like to load it in Ecuedit and try to design an XML spec for it. I could also try to disassemble it to get a hint on the conversion factors.

PostPosted: Thu Apr 10, 2008 1:18 pm
by ETC
I have no BIN file I can post, I am using OSIRIS Tuning Suite from a company called UpRev. All files are patched and only readable with their software.

Hi

PostPosted: Sat Apr 12, 2008 6:16 am
by christian_piasini
Here the stock dump of the 350 Z


Can easy find this maps too inside.


Regards


Christian Piasini
R&D Piasiniengineering

PostPosted: Sun Apr 13, 2008 2:58 pm
by radsdau
Cool!!! Which processor is that? Is that SH7055?

PostPosted: Sun Apr 13, 2008 4:45 pm
by Freon
Thanks. It appears this is a 7055 processor like the 2004 US STI and many 2004-2006 2.5L Turbo AVCS DBW models.

Is there a free flash program and some sort of affordable cable available for the 350Z available? If so I may be willing to spend some time writing basic definitions for it to help get a tuning platform started. I've started to disassemble it.

PostPosted: Sun Apr 13, 2008 11:32 pm
by ETC
Maybe we could come back to the original question? :wink: I am looking for help understanding the ETC table as from my testing it's not likely the cell values are directly related to throttle positions, however what they represent I do not know and I do not know what the horizontal axis represents.

PostPosted: Mon Apr 14, 2008 12:59 pm
by Freon
That's why I asked the above questions. You're asking for definition work to be done. I can't just open it and zero right in on the ETC stuff in 10-15 minutes. It's very complex on the Subaru Denso 7055/7058 ECUs. I'm not too interested in helping if this is just to help support a commercial reflash program.

So, how is this flashed? Is there a free reflash program available? I am willing to help if whomever is providing this capability is willing to take a similar approach as Colby has with free software and very affordable interface cables.

PostPosted: Mon Apr 14, 2008 11:42 pm
by ETC
Oh, OK.... well I don't know of any free flash programms for the VQ35 engines. You can buy the user tunable version of the aforementioned software though.

I thought that maybe someone would know more about the "logic" of the Denso ETC map, I wasn't asking for definition or reprogramming work.

PostPosted: Tue Apr 15, 2008 7:12 am
by Jon [in CT]
ETC wrote:I wasn't asking for definition or reprogramming work.
You asked for someone to define what the axis and cell values represent. That's called "definition."
ETC wrote:I do not know what the horizontal axis is and what the cell values represent.

Does anyone have any info on Denso ETC mapping?

PostPosted: Tue Apr 15, 2008 7:41 am
by ETC
Then I apologize, I figured this would be an "universal" information if someone has a clue on how Denso ETC maps work as they are surely not used exclusively on these engines. I am not a programmer, I am just using this tool to tune cars.

PostPosted: Tue Apr 15, 2008 7:54 am
by Jon [in CT]
ETC wrote:Then I apologize, I figured this would be an "universal" information if someone has a clue on how Denso ETC maps work as they are surely not used exclusively on these engines. I am not a programmer, I am just using this tool to tune cars.
They sure are exclusive to Nissan engines. Just because a manufacturer uses Denso software/compiler to create a ROM image doesn't mean that its tables have the same meanings as those created by other manufacturers using the same Denso software/compiler.

PostPosted: Tue Apr 15, 2008 8:07 am
by ETC
Okay, thanks for pointing this out.