[Paul Workman]

Perry, you may be thinking of clearing the codes stored in the ECM when disconnecting the battery. The calibration tables are not affected by disconnecting the battery. In fact, IIRC several places in the factory service manual (FSM) refers to disconnecting the battery for various reasons involving repair OR clearing old codes stored in memory.

For example, sometimes the FSM directs you to disconnect the battery to clear the (old) stored codes so that if a particular code reappears, you know it was logged after the battery was reconnected and not before.