ISCV control system disassembly

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Mar 21, 2012, 01:40 AM

#196

fireroasted

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After Dynotech's pushing and Raptord's help to get the cold idle down I did my own ghetto boost leak test. I drove it on slight boost. Ding, boost leak somewhere cause I can hear slight whistling. I have a tester arriving Thursday from

http://www.turboboostleaktesters.com...%29/Categories

to chase it down.

Just to restate the logic for others, the boost leak confirmation indicates a vacuum leak on non boost (idle) which throws off the attempt of the ECU to idle as programmed because air is entering the system that is not monitored. Correct?

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Jun 25, 2012, 08:21 AM

#197

EvocentriK

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Anyone happen to have the code for 9055 rom? Would be a great help

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Jul 5, 2012, 01:24 AM

#198

Jersey Dino

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subscribed to yet another throttle hang thread lol

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Aug 28, 2012, 08:36 AM

#199

jedibow

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Quote:

Originally Posted by thermaldynamics

Can anyone confirm if the following is correct for 9417? I pulled the definitions out of the Phenem mod Tephra V7 xml. The selected items below seem very odd when compared to 9653 or 9694. The balance of the definitions seem to have correct values. I've searched a decent amount to find the ISCV definitions for 9417 but I am guessing they aren't complete as of yet.

Code:

<table name="ISCV Demand CTS Adder #2** (Post WOT) (sub_1F1F8) [sub_1EFC0]" category="ISCV Control" address="5a54" type="2D" level="1" scaling="ISCV_AX2_8">
		<table name="Coolant Temp" address="6884" type="Y Axis" elements="8" scaling="Temp"/>
	</table>

	<table name="ISCV Demand CTS Adder #2*** (Post WOT) (sub_1F2C6) [sub_1EFC0]" category="ISCV Control" address="5a70" type="2D" level="1" scaling="ISCV_AX2_8">
		<table name="Coolant Temp" address="6884" type="Y Axis" elements="8" scaling="Temp"/>
	</table>

	<table name="ISCV Demand RPM Adder (Moderated by Baro, IATS) (FFFF6EA8) (sub_204B6) [sub_1EFC0]" category="ISCV Control" address="651c" type="2D" level="1" scaling="ISCV_AX2_16">
		<table name="RPM" address="635a" type="Y Axis" elements="10" scaling="RPM"/>
	</table>

	<table name="ISCV Demand Baro Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" address="64fe" type="2D" level="1" scaling="ISCV_AX2_8">
		<table name="Baro" address="6608" type="Y Axis" elements="5" scaling="Baro16"/>
	</table>

	<table name="ISCV Demand IATS Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" address="650e" type="2D" level="1" scaling="ISCV_AX2_8">
		<table name="Intake Air Temp" address="6884" type="Y Axis" elements="8" scaling="Temp"/>
	</table>

	<table name="ISCV Demand RPM Adder [rpm > 4500, load > 170, speed > 12 mph] (sub_1EFC0)" category="ISCV Control" address="605c" type="2D" level="1" scaling="ISCV_AX2_8">
		<table name="RPM" address="635a" type="Y Axis" elements="10" scaling="RPM"/>
	</table>

Thanks

All of the above addresses are incorrect for 9417XXXX, I have located the correct addresses for the following four tables and will update THIS POST when I locate the other tables. As of right now I would strongly recommend not adjusting any of these table in the 9417XXXX ROM including Tephra V7 as they all are incorrect...

Here are the four correct tables

ISCV Demand Baro Adder (FFFF8C9A) (sub_1A61C) Correct address=4338

ISCV Demand CTS Adder #2*** (Post WOT) (sub_1F2C6) [sub_1EFC0] Correct address=59d2

ISCV Demand CTS Adder #2** (Post WOT) (sub_1F1F8) [sub_1EFC0] Correct address=59b6

5e5a=ISCV Demand Baro Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0] Correct address =5E5a

Last edited by jedibow; Nov 21, 2012 at 11:13 AM.

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Aug 28, 2012, 09:47 AM

#200

Boosted Tuning

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Quote:

Originally Posted by jedibow

All of the above addresses are incorrect for 9417XXXX, I have located the correct addresses for the following four tables and will update THIS POST when I locate the other tables. As of right now I would strongly recommend not adjusting any of these table in the 9417XXXX ROM including Tephra V7 as they all are incorrect...

Here are the four correct tables

ISCV Demand Baro Adder (FFFF8C9A) (sub_1A61C) Correct address=4438

ISCV Demand CTS Adder #2*** (Post WOT) (sub_1F2C6) [sub_1EFC0] Correct address=59d2

ISCV Demand CTS Adder #2** (Post WOT) (sub_1F1F8) [sub_1EFC0] Correct address=59b6

5e5a=ISCV Demand Baro Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0] Correct address =5E5a

Thanks.

Only correct addys Im missing now for 9417 are:

ISCV Demand IATS Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]

ISCV Demand RPM Adder [rpm > 4500, load > 170, speed > 12 mph] (sub_1EFC0)

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Sep 22, 2012, 04:00 PM

#201

211Ratsbud

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Quote:

Originally Posted by Kakihara

I tried to adapt mrfred "new definitions" to my current rom and here are the results,

this is for the roms : 88580013 - 88580014 - 88580714

these tables give me the exact same values that you can see with the tables mrfred posted on page 1 for 88590015 rom
THOSE ARE IN NO WAY TESTED, PROVEN OR 100% SAFE

Code:

<scaling name="ISCV_AX2_8" units="% Demand" toexpr="x*100/255" frexpr="x*255/100" format="%.1f" min="0" max="200" inc="0.5" storagetype="uint8" endian="big"/>
<scaling name="ISCV_AX2_16" units="% Demand" toexpr="x*100/255" frexpr="x*255/100" format="%.1f" min="0" max="200" inc="0.5" storagetype="uint16" endian="big"/>
 
<table name="ISCV Demand Target Idle Trim (sub_1ECF6)" category="ISCV Control" type="2D" address="3e10" level="2" scaling="ISCV_AX2_8">
<table name="Target Idle Deviation" type="Y Axis" address="6da6" elements="9" scaling="RPMTarget"/>
</table>
 
<table name="ISCV Demand General CTS Subtractor (sub_1EBE6)" category="ISCV Control" type="2D" address="3e2e" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="70e6" elements="8" scaling="Temp"/>
</table>
 
<table name="ISCV Demand Baro Adder (FFFF6E98) (sub_1E1EE)" category="ISCV Control" type="2D" address="3dfe" level="2" scaling="ISCV_AX2_8">
<table name="Baro" type="Y Axis" address="6f30" elements="5" scaling="Baro16"/>
</table>
 
<table name="ISCV Demand RPM Adder* (sub_1EFC0)" category="ISCV Control" type="2D" address="41fc" level="2" scaling="ISCV_AX2_8">
<table name="RPM" type="Y Axis" address="6fa8" elements="10" scaling="RPM"/>
</table>

Here are some more that are even less safe the the ones above because
these tables DO NOT give me the same values that you can see with the tables mrfred posted on page 1 for 88590015 rom, the values are sligthly different, it may be because I'm trying to compare 2 roms that originally have different values or because the address I put are completly wrong !

THOSE ARE IN NO WAY TESTED, PROVEN OR 100% SAFE

Code:

<table name="ISCV Demand Startup CTS Adder (sub_1EBB8)" category="ISCV Control" type="2D" address="3d84" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="70e6" elements="8" scaling="Temp"/>
</table>
 
<table name="ISCV Demand CTS Adder #1** (sub_1F1F8, sub_1EA0C, sub_1F596) [sub_1EFC0]" category="ISCV Control" type="2D" address="3d5c" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="71ca" elements="8" scaling="Temp"/>
</table>
 
<table name="ISCV Demand CTS Adder #1b*** (sub_1F2C6) [sub_1EFC0]" category="ISCV Control" type="2D" address="3d70" level="2" scaling="ISCV_AX2_8">
<table name="Coolant Temp" type="Y Axis" address="71ca" elements="8" scaling="Temp"/>
</table>
 
<table name="ISCV Demand Baro Adder**** (FFFF7C0E) (sub_1F6E6) [sub_1EFC0]" category="ISCV Control" type="2D" address="6b00" level="2" scaling="ISCV_AX2_8">
<table name="Baro" type="Y Axis" address="6f30" elements="5" scaling="Baro16"/>
</table>

Has anyone verified any of this?

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Nov 8, 2012, 06:07 PM

#202

AutoXer

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Quote:

Originally Posted by jedibow

In my ROM (TephraV7 94170715) the correct address appears to be 4439 . Can anyone verify?

Stock values appear to be...

Baro	% Demand
0.465	36.1
0.625	36.5
0.785	37.3
0.865	38.0
0.945	39.6

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Nov 12, 2012, 11:18 AM

#203

domyz

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^^ 4338 correct adress here

Last edited by domyz; Nov 12, 2012 at 12:32 PM.

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Nov 12, 2012, 11:23 AM

#204

domyz

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double post

Last edited by domyz; Nov 12, 2012 at 02:10 PM.

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Nov 12, 2012, 11:39 AM

#205

AutoXer

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Quote:

Originally Posted by domyz

^^ 4438 correct adress here

Does the table look correct? Does it match what you have?

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Nov 12, 2012, 11:47 AM

#206

domyz

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Quote:

Originally Posted by AutoXer

Does the table look correct? Does it match what you have?

Sorry typo: 4338

4338: I have

7.4
5.8
3.1
1.1
0

4339 is wrong:

5.8
3.1
1.1
0
100

I cannot even confirm that 4338 is the correct adress. It just make more sense thant 4339 but it still could point to the wrong place.

Last edited by domyz; Nov 12, 2012 at 12:39 PM.

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Nov 12, 2012, 02:10 PM

#207

domyz

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First I'd like to thanks to all people who have worked on this. I'm not a fan of blind tuning so I'm trying to understand how the system works. I've read ALL the info about ISCV. I wanted to ask if anyone can confirm my understanding of the ISCV routine:

-The ISCV initial step position is a baseline for ISCV position. So at 0% demand, ISCV is at initial step position.

-ISCV Demand% is determined considering what the engine is doing (which sub is active) and multiple parameters (tps,coolant,iat,baro,rpm at differents % of effect on the final variable). ISCV demand% is translated to Steps by the ISCV stepper lookup table.

-ISCV Demand% trim is determined by comparing the target idle (target idle tables) vs the actual idle RPM. In stock ROM max trim is 2%demand at 500rpm deviation so it hasn't much effect on ISCV steps.

-The ISCV is a stepper motor that has 255 steps. If the final ISCV target is over 255 or under 0, different parameters has no effect on it anymore. So before starting to tweak tables it would be important to tune the BISS to get some room in most situations.

ISCV Demand% +/- ISCVTrims% => Lookup table steps

ISCV final position= Initial steps +/- Lookup table

The reason I suppose a negative %demand is because when I did a quick log of ISCsteps yesterday, they were under initial position table.

I'll be out tonight for logging and trying to confirm how it works before starting to blindly tweak the tables. It would be interesting to know in a logical way how to react to differents issues/different setups. Thanks for your answers!

Last edited by domyz; Dec 12, 2012 at 12:50 PM.

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Dec 11, 2012, 10:31 PM

#208

tjac357

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What does CTS stand for? Also, what tables are commonly changed for a ix with gsc s2's so it'll idle well? Thanks!

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Dec 11, 2012, 10:46 PM

#209

tjac357

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How does increasing the % demand effect the motor? I know I have a lot of questions, just want to understand what is being changed and why.

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Dec 11, 2012, 10:56 PM

#210

mrfred

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CTS = coolant temperature.

Not sure what your're asking about ISCV %demand. There are a number of tables that tweak %demand as a function of coolant temp, air temp, TPS, etc. They are meant to tweak the idle stepper position to give best possible idle over a range of operating conditions.

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