User Password Teaching Procedure

Dealer service representatives set user Passwords for "limp home" mode. The owner of the vehicle can select a number with four digits.

User password teaching can only be accepted by "learnt" ECMs.

"virgin" vs "learnt"

Prior to initial teaching procedures the ECM user password is "virgin". Once the initial teaching procedure is successful, the status of the user password changes from "virgin" to "learnt".

User password teaching begins with the ignition turned on, using a valid key. The user password, "virgin" is then sent by the tester. After a successful teaching procedure is run the user password changes from "virgin" to "learnt".

The "learnt" password can also be changed. This can be accomplished if the user password is "learnt" and the tester sends either an authorization of access, which would be the old password, or the vehicle specific data. Once authorization is complete, the ECM requests the new user password. The status remains "learnt" and the new user password will be valid for the next "Limp Home" mode.

If incorrect user passwords or wrong specific data are sent to the ECM three (3) times, the ECM will reject further requests for pass word change, for one (1) hour.

NOTE: The one-hour timer limitation cannot be reduced by any user actions. For instance if the battery is disconnected and reconnected during this period, the one-hour timer will restart.