After runnign Diacom on 4 different cars (and making sure it's in "normal" mode, not a diagnostic mode of some kind) I have noticed something I didn't think was supposed to happen- all the Block Learns go back to 128 after every time you shut the car off and restart. Shut it down, remove key, immediately restart and everything is back to 128 in all cells from idle on up. As soon as the ECM goes back into closed loop/learn mode ON you can watch them start moving up and down until they stabilize wherever they normally do (little above or below 128 on all cars tested- all are stock, unmodified engines in good running order.

I thought the ECM was supposed to "learn" over time and remember but apparently it doesn't from what I've seen. Unless DIacom always blows away the block learns every time it links up to the ECM again.

Anyone know whether I'm interpreting this correctly?

 

i dont think the ecm retains that information upon shutdown. Everything resets. All of the newer pcms, however, do have that feature. They can retain info such as adjusted engine paramiters, along with a snapshot of the cars speed, acceleration, etc when the engine is off.

 

While it does vary with different code, yes and no.

On a restart, there are a number of parameters that must be meet before the engine goes closed loop. So while in open loop, it may be showing 128s since the corrections don't apply until you are in closed loop.