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ISCV control system disassembly

 
Old Nov 17, 2011, 01:09 PM
  #166  
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Originally Posted by Dynotech Tuning View Post
So I started messing with the ISCV demand readings on our 95% bone stock evo 8 to get some base numbers.
  • AC and all electrical items are off
  • Target idle is 850rpm
  • Base ISC Step at operating temp is 7


The first thing I tried to do was set the BISS with Evoscan to 850 rpm per instructions someone posted from some service manual. Doing so would force the idle to rev up to about 1000 rpm when the actuator was disabled but there was not enough ISC adjustment to bring the idle back down (I waited until the ISC Steps in evoscan wouldn't go any lower).

So I decided to adjust the BISS without activating the actuator test in evoscan until I was reading 0% ISCV Demand. Once it reached 0%, I then activated the evoscan BISS actuator test and it reads 750rpm on the nose. I'm assuming this is actually a better BISS target than 850prm?

I also noticed that the ISCV Demand % would adjust itself every 30-60 seconds.

With ISCV Demand at 0%, my ISC Steps at idle with all electrical accessories off (including the radiator fan) reads 22 steps, just as a reference for anyone else.

I'm not sure if any of this is useful to anyone but I figured I would share.


-Jamie
(aka Jack_of_Trades)
Good info to have, thanks Jamie! With the cold weather rolling in I'm having a bit of trouble with my cold idle again, so it looks like I'll have to mess around with ISCV tables once more!
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Old Dec 6, 2011, 09:36 PM
  #167  
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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
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Old Dec 17, 2011, 08:30 AM
  #168  
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Can someone add these adjustments to the Tephra 7 download here: https://www.evolutionm.net/forums/ec...hramod-v7.html
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Old Dec 17, 2011, 08:52 AM
  #169  
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Originally Posted by Carloverx View Post
Can someone add these adjustments to the Tephra 7 download here: https://www.evolutionm.net/forums/ec...hramod-v7.html
For Evo IX? Just add the xml definitions to your TephraMod v7 xml file for 88590715
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Old Dec 17, 2011, 02:42 PM
  #170  
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hey im running 965300706 V7 in place of 96940011, glad im not the only person who isnt satisfied with their idle, mine isnt too bad trying to get a steady idle of 1100 but it typically seems to be searching for it between 1023 and 1250 i checked my ISC demand and its at 22% at idle ...anyone able to point me in the correct direction for this? i do not have idle sensitivity tables or error tables

only other issue im expierencing is after i take the car out of gear either coasting or coming to a sudden stop the rpms drop and the car will either stumble for a few seconds then recover or stall if i dont blip the throttle...anyone else having this problem?
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Old Dec 17, 2011, 02:58 PM
  #171  
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Chabada, are you on stock injectors?
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Old Dec 19, 2011, 02:09 PM
  #172  
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Just a quick thing for people to check. If your throttle cable isnt adjusted correctly, leaving the throttle slightly cracked open, or your TPS isn't adjusted properly the car does not know its in idle mode and can wreak havoc on your idle quality. I believe the standard minimum TPS setting in evoscan reads around 13% open at idle. I believe anything 3-5% higher than that will make the ECU consider the car to NOT be idling.

The best way to confirm that your car is in idle mode is to watch your ignition timing at idle. If it swings roughly +/-5 to 10 degrees, it's in idle mode. If its holding a pretty solid timing value, its not in idle mode.

Food for thought.

-Jamie

Last edited by Dynotech Tuning; Dec 19, 2011 at 02:12 PM.
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Old Dec 19, 2011, 02:31 PM
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Unless you've fixed the idle timing to lookup a specific degree.
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Old Dec 19, 2011, 03:20 PM
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Yes, "ONLY" if the 'idle stability timing control' table is set to 0, the base timing actuator or BISS actuator are activated. Under ALL other circumstances, idle timing will fluctuate to stabilize the idle RPM.

-Jamie

Last edited by Dynotech Tuning; Dec 19, 2011 at 05:25 PM.
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Old Dec 21, 2011, 02:53 PM
  #175  
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I have a noob question about these tables. Which table should I be adjusting if I want to slow down the RPM drop from 1.5k rpms.

An example, I put the car in neutral when I'm around 4-5k rpms. The RPM needle drops at a good pace, but at soon as it hits around 1.5k rpms, it just drops a lot more quicker. My car is having hard time recovering from that. My idle is set to 1k and biss screw around to 800.

Is there a way to decrease the rate of the rpm drop in my situation?
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Old Dec 27, 2011, 10:22 PM
  #176  
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Originally Posted by xmaciek82x View Post
I have a noob question about these tables. Which table should I be adjusting if I want to slow down the RPM drop from 1.5k rpms.

An example, I put the car in neutral when I'm around 4-5k rpms. The RPM needle drops at a good pace, but at soon as it hits around 1.5k rpms, it just drops a lot more quicker. My car is having hard time recovering from that. My idle is set to 1k and biss screw around to 800.

Is there a way to decrease the rate of the rpm drop in my situation?
try increasing your "desired ISCV initial step position" in the "neutral" and "drive" tables, in the highest temps.
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Old Jan 4, 2012, 01:16 PM
  #177  
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Originally Posted by prowakeskater View Post
try increasing your "desired ISCV initial step position" in the "neutral" and "drive" tables, in the highest temps.
Didn't even see this response. Once I get some free time, I will try that and report back. Thanks
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Old Jan 27, 2012, 01:55 PM
  #178  
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So I had an Evo 9 come in with +10 ISCV Demand Trim AC Off and I disconnected the battery for 30 minutes while I did other stuff and when I connected it back, fuel trims were reset but ISCV demand stayed the same. How can I easily reset that back to default?
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Old Jan 27, 2012, 04:12 PM
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I would like to know the answer too, as I thought the learned idle settings reset with a battery dissconnect.
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Old Jan 27, 2012, 04:30 PM
  #180  
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Originally Posted by merlin.oz View Post
I would like to know the answer too, as I thought the learned idle settings reset with a battery dissconnect.
It had the 88590013 rom in it and I reflashed to 88590715, assuming that would re-write it but that didnt work either. So strange, maybe MrFred can confirm this with his car and just tell me I'm crazy or something lol.


-Jamie

Last edited by Dynotech Tuning; Jan 27, 2012 at 04:32 PM.
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