Teaching Procedures

Key teaching must be done after replacing a defective PCM (ECM) or when providing additional keys to the vehicle owner.

The procedure starts with a PCM (ECM) request for vehicle specific data (PIN code: 6 digits) from the tester. The "virgin" PCM (ECM) stores the vehicle specific data and the key teaching can be started. The "learnt" PCM (ECM) compares the vehicle specific data from the tester with the stored data. If the data match, the teaching can proceed.

If incorrect vehicle specific data is sent to the PCM (ECM) three times, the PCM (ECM) will reject the request of key teaching for one hour. This duration cannot be shortened by neither disconnecting the battery or any other manipulation. After reconnecting the battery, the delay timer will reset to one hour.

The key teaching is done by ignition on with the key and additional tester commands. The PCM (ECM) stores the relevant data in the EEPROM and in the transponder. Then the PCM (ECM) runs the authentication required for confirmation of the teaching process. The successful programming is then confirmed by a message to the tester.

If the key is already known to the PCM (ECM) from a previous teaching, the authentication will be accepted and the EEPROM data are updated.

There is no changed transponder content. (This is impossible for a learnt transponder.)

The attempt to repeatedly teach a key, which has already been taught during the same teaching cycle, is recognized by the PCM (ECM). This rejects the key and a message is sent to the tester.

The PCM (ECM) rejects invalid keys, which are presented for teaching. A message is sent to the tester. The key can be invalid due to faults in the transponder or other reasons, which result from unsuccessful programming of data. If the PCM (ECM) detects different authenticators of a transponder and an PCM (ECM), the key is considered to be invalid.

The maximum number of taught keys is 4.

If an error occurs during the Immobilizer Service Menu, the PCM (ECM) status remains unchanged and a specific fault code is stored.

If the PCM (ECM) status and the key status do not match for teaching of keys, the tester procedure will be stopped and a specific fault code will be stored at PCM (ECM).

Fig 1: Key Teaching Procedure Flowchart

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1. PCM (ECM) learnt status.
   Fig 2: Display - PCM (ECM) Learnt Status Screen

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   Fig 3: Display - Teaching ID Register Screen

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   Fig 4: Display - 1st Key Teaching Screen

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   Fig 5: Display - 1st Key Teaching Completion Screen

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   Fig 6: Display - 1st Key Teaching Screen

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   Fig 7: Display - Key Teaching OK Button Screen

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   Fig 8: Display - 2nd Key Teaching Completion Screen

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   Fig 9: Display - Key Teaching OK Button Screen

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   Fig 10: Display - 3rd Key Teaching Completion Screen

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   Fig 11: Display - Key Teaching OK Button Screen

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   Fig 12: Display - 4th Key Teaching Completion Screen

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2. PCM (ECM) virgin status.

   After replacing new "PCM (ECM)", GDS displays that PCM (ECM) is in virgin status in Key Teaching mode.

   "VIRGIN" status means that PCM (ECM) has never matched with any PIN code before.

The user password for limp home is taught at the service station. The owner of the vehicle can select a number with four digits.

The user password teaching is only accepted by a "learnt" PCM (ECM). Before first teaching of user password to an PCM (ECM), the status of the password is "virgin" and No limp home function not available.

The teaching is started by turning ignition on, with a valid key (learnt key) and sending the user password by tester. After successful teaching, the status of the user password changes from "virgin" to "learnt".

The learnt user password can also be changed. This can be done if the user password status is "learnt" and the tester sends authorization of access, either the old user password or the vehicle specific data. After correct authorization, the PCM (ECM) requests for the new user password.

The status remains "learnt" and the new user password will be valid for the next limp home mode.

If wrong user passwords or wrong vehicle specific data is sent to the PCM (ECM) three times continuously or intermittently, the PCM (ECM) will reject the request to change the password for one hour. This duration cannot be shortened by disconnecting the battery or any other actions. After reconnecting the battery, the delay timer will reset to one hour.

1. User password teaching
   Fig 13: Display - Password Teaching/Changing ID Register Screen (1 Of 5)

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   Fig 14: Display - Password Teaching/Changing ID Register Screen (2 Of 5)

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   Fig 15: Display - Password Teaching/Changing ID Register Screen (3 Of 5)

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   Fig 16: Display - Password Teaching/Changing ID Register Screen (4 Of 5)

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   Fig 17: Display - Password Teaching/Changing ID Register Screen (5 Of 5)

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   * When wrong password is entered, retry from the first step after 10 seconds.

2. Changing user password
   Fig 18: Display - Changing User Password Screen (1 Of 5)

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   Fig 19: Display - Changing User Password Screen (2 Of 5)

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   Fig 20: Display - Changing User Password Screen (3 Of 5)

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   Fig 21: Display - Changing User Password Screen (4 Of 5)

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   Fig 22: Display - Changing User Password Screen (5 Of 5)

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