Quote from the official handbook (MY 2000-2003):
Page 22-117
"System Description
The vehicle is equipped with an immobilizer system that will disable the vehicle unless the proper ignition key is used. This system consists of a transponder located in the ignition key, an immobilizer receiver unit, an indicator light, and the ECM. ...
When the key is inserted in the ignition switch and turned to the (II) position, the immobilizer receiver unit sends power to the transponder in the ignition key. The transponder then sends a coded signal back through the immobilizer receiver unit to the ECM.
- The immobilizer system can store up to six key codes.
- If it is necessary to rewrite the ECM, the dealer needs the customer's vehicle, all its master keys and valet keys, and the Honda PGM Tester equipped with an immobilizer program card with the latest version of PGM Tester software. Any key that is not learned during rewriting will no longer start the engine, except keys duplicated with the llco Code Key Duplicator.
- If the customer has lost his key, and cannot start the engine, contact Honda Customer Relations.
- It is possible to add ONE new key without reprogramming all of the keys (follow the prompts in the PGM TesterIMMOBI menu)"
Hope this helps.