RomRaider

Hi I’m trying to find my injector size through ida I’ve put the Motorola code in 6816 start address 0x220 and I’m stuck where do I go from here


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@NSFW

Hi I’m trying to find my injector flow rate . I’m told it can be done through ida . I would also like to find additional tables.

I’m not after reverse engineering the ecu so from what I can gather xmltold.exe Wouldnt help me would it ?

Any pointers Please . I put the 0x220 address in . Do I have to fill the gaps in with the addresses from my definition? And where would I start to work out the rest? Any help would be appreciated

When you talk about what cpu an ecu uses and has it been documented. Do you mean brand ? Ie Denso , hitachi or actual part number? Is this marked or written on the cpu when I open the ecu lid ?




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If this is your 16bit JDM Rom, don't waster your time looking for injector size or flow rate value in this ROM, it doesn't exist. The tables you need to work with different injector sizes have already been defined.
Here's some background.

No worries I will just go STANDALONE

The rom your on about is USDM and probably won’t even work on JDM

I was only trying to learn and seek new things . I’m far from a computer wizard. But as on here not many have knowledge of things . I wanted to learn which obviously would require help from others but from this who read the posts would show others how things work to rather than mithering or asking questions to something so simple to some people.


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That USDM ROM is nearly identical to the JDM ROM.
Two of us worked on it years ago to support that project.

You say it’s nearly identical to the Jdm rom what’s different. Could I flash it to mine and use it . It has Vdc and I don’t would that matter


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Why would you want to do that?

I don’t no if I’m getting this wrong here dale but from what I understand the USDM rom has the tables defined for injectors?

My stumbling point is When I boost my engine the injectors will be maxed out straight away and won’t take it . The tables you put together which I appreciate by the way as you say will appear to influence it as you say ? I’ve not tried it yet as I’m waiting on a few things.
From what I understand I need injector scaling and pulse width or do I not .What would be the best way for me to upgrade to 550cc injectors

from stock then and get this to work

you say scaling and pulse width doesn’t exists?

Also one other thing I would like if at all possible is to be able to start my car up from cold in the morning not from 2k but from more like 1500 or 1200 rpm . I no it’s set high to get the heat into the catalyst. I have three catalysts and I’m binning two of them .

I’m not a tuner or a wizard on ecus . Any help would be greatly appreciated . I’m not sure how to take you Dale


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You should really focus most of your questions into a single thread.

With that said I am not familiar with your map but generally there are two tables for injectors of which one is for the actual scaling which the data can be found everywhere, and then there is a table for voltages.

Your idle issues can be related to the tables for coolant temps and the tables for idle speeds with different loads.

Poke around the map and look at tables and their descriptions. I have no tuning experience but I found the tables easy to figure out and modify.

The tables in your JDM ROM are the exact same tables available to you in the USDM ROM (you can check this for yourself). The JDM definition is based on the USDM ROM definition. The ROMs are nearly identical and the USDM ROM was defined and tuned years ago, as the linked posts indicate. Is it not a path already blazed?

Everything you need is in the definition. There is no such thing as injector scaling in the JDM or USDM ROMs. It doesn't use or even care about the injector size you have. Modify the tables provided to achieve the pulse width you need to hit the AF targets you want.


I've said many times, scaling does not exist. Pulse width is the what you need to log, and adjust the tables to get the pulse width that causes you to hit the AF targets you need.

Why not adjust your idle target tables? Maybe there's some other tables not found.

I'm no tuner either.

Generally your statement is correct, but in the case of this ROM, there's no injector scaling value. There is latency/dead time vs volts.

If you care to look at fuelling routines, start here ...

I guess my statement was too broad Just trying to get him to poke around and learn things.

That’s a fair comment. I’ve adjusted the rpm to 1500rpm but it still hits 2000rpm on start up.others also think there is other tables not found .I must admit this is way over my head .

Really I need help here. I have ida and started following this link below for the Format16bitrom.idc. Is this something I download ? im stuck on number 6 to format the a copy of a Rom

I've created two scripts to help decode 16bit ROMs in IDA.
Source: Format16bitROM.idc

Here are the steps:
1.You will not need to convert your 160kb ROM to 192kb, either size can be opened and formatted by this process.
2.Open your ROM with IDA.
3.Change the processor type to Motorola Series: 6816.
4.No need to define a RAM segment just click OK to proceed.
5.Under the IDA File menu select Script file (Alt-F7)
6.Select the script named Format16bitROM.idc
7.Read the warning and press Yes to proceed formatting the ROM


http://www.romraider.com/forum/viewtopi ... &start=122


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Take a step back from of all of this for a moment and think about the real issues.

Is your car driveable and running? If it is then your map is fine and needs to be tuned.

I feel like your not listening to the advice given here and how you should really be proceeding and it makes people not want to help.

If you had a car that didn't have a map that was usable then that would be different. But you do seem to have that and so you need to learn how to tune the map.

Now we have no issues helping with that but you need to be willing to listen to our advice.