Teaching Procedures: Notes

Key teaching must be done after replacing a defective PCM(ECM) or when providing additional keys to the vehicle owner. The procedure starts with an PCM(ECM) request for vehicle specific data (PIN code: 6digits) from the tester. The "virgin" P (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 are correct, the teaching can proceed.

If incorrect vehicle specific data have been sent to the PCM(ECM) three times, the PCM(ECM) will reject the request of key teaching for one hour. This time cannot be reduced by disconnecting the battery or any other manipulation. After reconnecting the battery, the timer starts again for one hour.

The key teaching is done by ignition on with the key and additional tester commands. The PCM(ECM) stores the relevant in the EEPROM and in the transponder. Then the PCM(ECM) runs the authentication required for confirmation of the teach 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 EEPR 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 been taught already 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 in 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 8

If an error occurs during the Immobilizer Service Menu, the PCM(ECM) status remains unchanged and a specific fault code 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 Process Flow Chart

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1. PCM(ECM) learnt status.
   Fig 2: Display - Immobilizer (IMMO) Selected

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   Fig 3: Display - Teaching

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   Fig 4: Display - Teaching Screen

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   Fig 5: Display - Message To Continue 1st Key Teaching Screen

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   Fig 6: Display - Message To Continue 2nd Key Teaching Screen (1st Key Teaching Completed)

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   Fig 7: Display - Message To Continue Next Key Teaching Screen

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   Fig 8: Display - Message To Continue 3rd Key Teaching Screen (2nd Key Teaching Completed)

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   Fig 9: Display - Message To Continue Next Key Teaching Screen

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   Fig 10: Display - Message To Continue 4th Key Teaching Screen (3rd Key Teaching Completed)

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   Fig 11: Display - Message To Continue Next Key Teaching Screen

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   Fig 12: Display - Message To Continue 5th Key Teaching Screen (4th Key Teaching Completed)

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2. PCM(ECM) virgin status.

   After replacing new "PCM(ECM)" scan tool displays that PCM(ECM) is virgin status in Key Teaching mode. "VIRGIN" status means that PCM(ECM) has not matched any PIN code before.