I was surfing some random stuff here in the forums and came across another persons Idle Stepper Look Up Table. I noticed that it refereced different than mine. Theirs has Coolant temp (Celsius) on the top and load on the left side. Mine has Throttle position on the top and RPM on the left side. Below is a copy of my Evo7Base.xml section that pertains to this table.


<table name="Idle Stepper Look-up Table" category="Idle" type="3D" level="2" scaling="ISCVSteps">
<table name="Throttle Position" type="X Axis" elements="8" scaling="uint16"/>
<table name="RPM" type="Y Axis" elements="27" scaling="RPM"/>

I have an 03 VIII running 94170015 v5.10

Please help me correct this.

Thank you.

Paul

 

And Yes I did SEARCH prior to bringing this up.

From what I found....The 05+ use the coolant temp and load for the idle stepper reference. This to me makes sense because the throttle position isn't used in idle.

I dove into this because of the hunting my car does at idle when coming to a coasting stop. I believe that if the stepper table were properly referenced this could fix my problem.

Again, please help.

 

37 looks and no one has any idea what I am talking about???



Why would throttle position and RPM matter for an Idle table??

Please explain.

 

OK, that is the IDLE STEPPERMOTOR TARGET, LOAD v TEMP table.

So your x axis is mis-labled, should be Coolant Temp (Celsius)
Obviously then the numbers are wrong, so you addy for the scaling is wrong.
Should be: -32,-8,7,13,20,27,34,41.

The y axis is load, so your scaling on that is crook also.
No I dont have info on your ROM.
The data looks good though.

The right side column (41* and up) is the one we modify to reduce throttle hang.
Typically, where it hits 73, start tapering the data down to about 40. ie get rid of the 160s etc. But only on the last column. There is a good thread on this somewhere.

 

So I need to go into my Evo7Base.xml and change the coding below to what???

<table name="Idle Stepper Look-up Table" category="Idle" type="3D" level="2" scaling="ISCVSteps">
<table name="Throttle Position" type="X Axis" elements="8" scaling="uint16"/>
<table name="RPM" type="Y Axis" elements="27" scaling="RPM"/>

I am sure I will have to change the 94170015 as well.

<table name="Idle Stepper Look-up Table" address="4399">
<table name="Throttle Position" address="68b8" elements="8"/>
<table name="RPM" address="68d2" elements="27"/>

 

I have:

 

So could the 94170015 and Evo7base have an issue on the idle stepper coding?

I looked at the 008 and 0014 and they are the same as the 0015.

Please keep in mind I am USDM too.

Thanks for your help.

Please keep the information coming.

 

see post #206 and following
https://www.evolutionm.net/forums/ec...-table-14.html

 

I used that thread and got it looking close. My top now says
.... Cooland Temp (Celsius) (Celsius)....

Did I do something wrong?

Oh and the table valuse did not change. The scaling on both the X and Y did change appropriately.

 

Take this:

evo7Base:

<table name="Idle Stepper Look-up Table" category="Idle" type="3D" level="2" scaling="ISCVSteps">
<table name="Engine Temp" type="X Axis" elements="8" scaling="Temp"/>
<table name="Load" type="Y Axis" elements="27" scaling="Load"/>

94170015:

<table name="Idle Stepper Look-up Table" address="4399">
<table name="Engine Temp" address="68b8" elements="8"/>
<table name="Load" address="68d2" elements="27"/>

The values in red are what needs to be changed.

 

Cool....Got it ! !

Thanks everyone.