ISCV control system disassembly
#406
Evolved Member
Hey guys bringing this back, I have collected every known iACV table in the universe from left to right messed with every single one and not one will do what im after, so im under the belief im doing something wrong or just still missing a certain table, so problem is in neutral or clutch in decel, rpms will drop down to 500-700 and then come up, i would like to believe that if 25 steps will hold 1000rpm idle then as soon as the engine revs over 2k it would step to 30 or 35 so when the rpm comes down it will fall to 1200-1500 and then decay down to 1000rpm. IPW turns back on at 2k but idle steps wont budge from whatever is the base setting for idle.
i need a solution to this asap and will compensate anyone willing to help or has the proper XML code that im missing, possibly even the "DECEL fuel resume rpm" tables for 8859 and 9417 roms!
i need a solution to this asap and will compensate anyone willing to help or has the proper XML code that im missing, possibly even the "DECEL fuel resume rpm" tables for 8859 and 9417 roms!
#408
Evolving Member
iTrader: (21)
if anyone needs the "Decel Fuel Resume RPM" for 8859 here it is. solved my decel issue.
<table name="Decel Fuel Cut Resume RPM" category="Fuel" address="3030" type="2D" scaling="RPM8">
<table name="Engine Temp" address="6fde" type="X Axis" elements="8" scaling="Temp" />
</table>
<scaling name="RPM8" units="RPM" toexpr="x*125/16" frexpr="x*16/125" format="%.0f" min="0" max="2000" inc="50" storagetype="uint8" endian="big" />
<table name="Decel Fuel Cut Resume RPM" category="Fuel" address="3030" type="2D" scaling="RPM8">
<table name="Engine Temp" address="6fde" type="X Axis" elements="8" scaling="Temp" />
</table>
<scaling name="RPM8" units="RPM" toexpr="x*125/16" frexpr="x*16/125" format="%.0f" min="0" max="2000" inc="50" storagetype="uint8" endian="big" />
#410
Evolved Member
#412
Evolved Member
iTrader: (17)
You do get those fluctuations with any way. Their just a by product of the voltage change.
When you do the trim way, you do use the BISS, so dont know what your saying there.
Also the trims settle down. My have stayed between 0 and +1 for years.
Last edited by Evo_Jay; Feb 20, 2019 at 01:27 AM.
#413
Evolved Member
iTrader: (17)
Also, as per MRFRED disassembly, the unit of "steps" is incorrect. That was an error done in early development. The way the ECU thinks of it is a demand %.
And looking/tuning at the ROM in steps vs demand is no different. Your looking at the same hex data, just one of them has incorrect scaling and is reading wrong.
And looking/tuning at the ROM in steps vs demand is no different. Your looking at the same hex data, just one of them has incorrect scaling and is reading wrong.
#415
EvoM Community Team Leader
If I'm not mistaken it's like tuning fuel trims, you adjust the biss to get as close to 0% as you can.
#417
EvoM Community Team Leader
#419
EvoM Community Team Leader
P.S. in this context the biss position would also be part of the "tune". To make a bad analogy, kinda like fuel pressure would effect the injector tune.
Last edited by Biggiesacks; Feb 20, 2019 at 09:34 AM.