What's the Nissan code 00 initial start?

The Nissan code 00 initial start message indicates that the self-diagnosis results of self-learning has not been memorized in the A/T control unit. This message is stored in the self-diagnosis memory of the A/T control unit whenever the following systems are disrupted.The battery cable is disconnected or the battery is replaced. The power supply line is short-circuited. The connector at the A/T control unit has poor contact. The fuse in the power supply circuit burns out. The connector from the A/T control unit is disconnected. The A/T control unit is replaced. The battery runs down.