Sorry to be gone so long but I'm baaaack. ASEMaster6371 is right. There's nothing to "clear". That used to be more of a GM thing. Disconnecting the battery will cause the idle problem, not solve it. While it sounds like you didn't do that, there isn't anything you can do with the scanner to make it NEED to relearn minimum throttle. Erasing the adaptive memory, (fuel trim numbers), will just make it start over from preprogrammed values and it will immediately start to rebuild those tables when you start driving.
Given the history and details, do the coasting procedure first. If that doesn't result in a nice idle flare-up at start-up and solve the low idle problem, use a scanner to view the idle "steps". They range from 0 to 256. "32" is about typical for a properly running engine. If you find it at "0", minimum throttle hasn't been relearned. Try holding the brake pedal up with your toes while doing the coasting procedure. If you find a relatively high step such as 45 to 50, the Engine Computer sees that idle speed is too low and is trying to raise it but without success. It's rare but if you find a really low step, say 10 to 15, the computer thinks idle speed is too high and is trying to bring it down. Look for something causing a double signal from the crankshaft position sensor or camshaft position sensor. I've read about a cracked core in the crank sensor causing something like that.
Most scanners will allow you to run the idle speed up and down by pressing a couple of buttons. Look for a listing for "automatic idle speed test" or something like that. I use the Chrysler DRB2 and DRB3. They allow you to raise engine speed to 2000 rpm in 200 rpm increments. If that works, you know the AIS motor is working and the air passage is not plugged. As I recall, that test with the scanner does not work if minimum throttle hasn't been relearned yet but that might not pertain to all models.
Friday, August 3rd, 2012 AT 3:57 AM