Teaching Procedures |
1. |
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 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).
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2. |
User Password Teaching Procedure
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.
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Limp Home Function |
1. |
Limp Home By Tester
If the PCM (ECM) detects the fault of the SMARTRA or
transponder, the PCM (ECM) will allow limp home function of the
immobilizer. Limp home is only possible if the user password (4 digits)
has been given to the PCM(ECM) before. This password can be selected by
the vehicle owner and is programmed at the service station.
The user password can be sent to the PCM (ECM) via the special tester menu.
Only when the PCM (ECM) is in "learnt" status, the user
password status is "learnt" and the user password is correct, the PCM
(ECM) will be unlocked for a period of time (30 sec.). The engine can
only be started during this time. Engine cannot be started after this
time has elapsed.
If the wrong user password is sent, the PCM (ECM) will reject
the request of limp home for one hour. Disconnecting the battery or any
other action cannot shorten this duration. After connecting the battery
to the PCM (ECM), the delay timer will reset to one hour. |
2. |
Limp Home By Ignition Key
The limp home can be activated also by the ignition key. The
user password can be input to the PCM (ECM) by a special sequence of
ignition on/off.
Only when the PCM (ECM) is in "learnt" status, the user
password status is "learnt" and the user password is correct, the PCM
(ECM) will be unlocked for a period of time (30 sec.).
The engine can be started during this time. Engine cannot be
started after this time has elapsed. After a new password is entered,
the timer (30 sec.) will reset.
After ignition off, the PCM (ECM) is locked if the timer has
elapsed 8 seconds. For the next start, the input of the user password is
requested again. |
Replacement |
Problem | Part set | GDS required? |
Lost all keys | Blank key (4) | YES |
Antenna coil unit does not work | Antenna coil unit | NO |
PCM(ECM) does not work | PCM(ECM) | YES |
Ignition switch does not work | Ignition switch with Antenna coil unit | YES |
Unidentified vehicle specific data occurs | Key, PCM(ECM) | YES |
SMARTRA unit does not work | SMARTRA unit | YES |
1. |
Things to remember before a replacement (PCM(ECM)) |
2. |
Things to remember before a replacement (Keys & Additional registration)
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