Commanded idle speed

[myburb]

I have my idle in p/n and d set at 650 and when I am stopped it shows 650 in the commanded idle box also. As soon as I go the commanded idle jumps to 688. It has done this forever and I never could figure out what exactly caused it. I am guessing it is something to do with throttle follower. Any ideas?

[RobertISaar]

there is likely an offset being used for "vehicle in motion" that is added to commanded idle speed. I'm not familiar enough with the TBI masks to be certain. I know there are more than a few masks that add raw IAC steps instead of commanding a higher idle speed.... they both accomplish the same task and roughly the same way of going about it as well.