RomRaider

Hi all, been running this map on a few jdm cars and so far so good. For the sake of the fuel pump longevity though, it would be nice if the fuel pump duty would vary as it does on the stock ecuroms. Looking at the Grp N rom, i think the fuel pump duty logic runs from sub_CED8 which calls sub_CF1A, sub_CF8C and sub_CEEC (confirmation requested). My assembly coding is rather rusty and I was hoping to start a thread which might lead to a fuel pump duty control for this rom.......

Just tried a rom I had patched up with code borrowed from the spec c rom for fuel pump duty; the pump duty ran at 33.33% but doesn't increase when i rev up the engine, but i can see some at the end of this tunnel.
In the stock rom, what parameter(s) are used to govern fuel pump duty?

Without opening IDA and actually going through the code, I know that the last pic you posted is what actually applies the FPDC. The middle box sets 100% FPDC(0ffh) while the left and right boxes(clr 3, z) set it to 0% FPDC. The issue with controlling it any further would be space. I will try to work it out with the limited space available and maybe I can put something together this winter. I don't have time until at least November though FWIW, running the pump that hard is only going to shorten the life span by minimal amounts.

Andy

Thanks for the info.

This is the logic from an 02wrx for controlling the pump. Basically you need to find space for that.

Andy

Thanks, already got some space for that particular code in the grpn rom hence the pump is now running at 33.33%, using code from the jdm spec c rom which is similar anyways; the spec c rom however calls 4 subroutines as compared the grpn one as seen in the very first pic above, trying to figure out the first routine called as that might have some bearing on what duty the fuel pump is set to. Also not too worried about the pump duty as such, but using this to learn some of the ecus logic.

Anyone got a theory on why they use 33 / 66 / 100 rather than just a simple "min(100, IDC+25)" or something like that?

I would really like to be able to run my in tank pump at 100% to prevent cavitation on my bosch at idle. Someone please figure it out for the 06 WRX.

What's the rom id?

I got your PM and I'll do it on for your ROM on Tuesday.

Briefly, the process to create the table for a 32-bit ROM goes like this:

Find the SSM function that retrieves fuel pump duty.
Find the variable that function returns.
Look for XREFs to that variable.
In my ROM there are only 3 XREFs:
The first initializes it to zero.
The 2nd is the SSM routine.
The 3rd is a function that checks some switches and sets it to 0, 33, 66, or 100.
A table can be defined for the 33 and 66 values, so they can be set to whatever you want. Setting both to 100 should cause the pump to run at 100% all the time. Or you could set them 50 and 75 for example, if you just want a modest increase from the 33 and 66 settings.

That worked for my ROM, and I'm guessing the 06 WRX will be pretty similar. I haven't dug into it yet though. Nor have I tested changes to the table for my own ROM yet but like I said... Tuesday.

Thanks NSFW.
The ROM ID is A8DH201X

Sounds like great progress guys!