Teaching Procedures: Notes

Key Teaching Procedure
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: 6 digits) from the scantool. 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 scantool 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 scantool 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 scantool.

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 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 scantool.

The PCM (ECM) rejects invalid keys, which are presented for teaching. A message is sent to the scantool. 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 8

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 scantool procedure will be stopped and a specific fault code will be stored at PCM (ECM).

NOTE: When teaching the 1st key, SMARTRA registers at the same time.

Fig 1: Diagnostic Flow Chart

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PCM (ECM) learnt status.

Fig 2: Screen Display - Key Teaching (1 Of 11)
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Fig 3: Screen Display - Key Teaching (2 Of 11)
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Fig 4: Screen Display - Key Teaching (3 Of 11)
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Fig 5: Screen Display - Key Teaching (4 Of 11)
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Fig 6: Screen Display - Key Teaching (5 Of 11)
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Fig 7: Screen Display - Key Teaching (6 Of 11)
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Fig 8: Screen Display - Key Teaching (7 Of 11)
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Fig 9: Screen Display - Key Teaching (8 Of 11)
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Fig 10: Screen Display - Key Teaching (9 Of 11)
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Fig 11: Screen Display - Key Teaching (10 Of 11)
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Fig 12: Screen Display - Key Teaching (11 Of 11)
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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.