Problems And Replacement
Parts:
Problem
|
Part set
|
Scan tool
required?
|
All keys have been lost
|
Blank key (4)
|
YES
|
Antenna coil unit does not work
|
Antenna coil unit
|
NO
|
ECM does not work
|
ECM
|
YES
|
Ignition switch does not work
|
Ignition switch with Antenna coil unit
|
YES
|
Unidentified vehicle specific data occurs
|
Key, ECM
|
YES
|
Immobilizer unit does not work
|
Immobilizer unit
|
YES
|
Replacement
Of Ecm And Immobilizer
In case of a defective
ECM, the unit has to be replaced with a "virgin" or "neutral" ECM. All
keys have to be taught to the new ECM. Keys, which are not taught to the
ECM, are invalid for the new ECM (Refer to key teaching procedure). The
vehicle specific data have to be left unchanged due to the unique
programming of transponder.
In case of a defective
Immobilizer, it needs teaching the Immobilizer. A new Immobilizer device
replaces the old one and Immobilizer need teaching.
1. |
Things to remember before a replacement
(ECM)

|
2. |
Things to remember before a replacement
(Keys & Additional registration)

1. |
When there is only one key
registered and you wish to register another key, you
need to re-register the key which was already
registered. |
2. |
When the key #1 is registered
and master key #2 is not registered, Put the key #1 in
the IG/ON or the start position and remove it. The
engine can be started with the unregistered key
#2.
(Note that key #2 must be used
within 10 seconds of removing key
#1) |
3. |
When the key #1 is registered
and key #2 is not registered, put the unregistered
master key #2 in the IG/ON or the start
position.
The engine cannot be started
even with the registered key
#1. |
4. |
When you inspect the immobilizer
system, refer to the above paragraphs 1, 2 and
3.
Always remember the 10 seconds
zone. |
5. |
If the pin code & password
are entered incorrectly on three consecutive inputs, the
system will be locked for one
hour. |
6. |
Be cautious not to overlap the
transponder areas. |
7. |
Problems can occur at key
registration or vehicle starting if the transponders
should
overlap. | | |
Neutralizing
Of ECM
The ECM can be set to
the "neutral" status by a tester.
A valid ignition key
is inserted and after ignition on is recorded, the ECM requests the
vehicle specific data from the tester. The communication messages are
described at "Neutral Mode" After successfully receiving the data, the ECM
is neutralized.
The ECM remains
locked. Neither the limp home mode nor the "twice ignition on" function,
is accepted by the ECM.
The teaching of keys
follows the procedure described for the virgin ECM. The vehicle specific
data have to be unchanged due to the unique programming of the
transponder. If data should be changed, new keys with a virgin transponder
are requested.
This function is for
neutralizing the ECM and Key. Ex) when lost key, Neutralize the ECM then
teach keys.
(Refer to the Things
to do when Key & PIN Code the ECM can be set to the "neutral" status
by a scanner. If wrong vehicle specific data have been sent to immobilizer
three times continuously or intermittently, the immobilizer will reject
the request to enter neutral mode for one hour. Disconnecting the battery
or other manipulation cannot reduce this time. After connecting the
battery the timer starts again for one hour.
•
|
Neutralizing setting
condition |
- |
In case of ECM status "Learnt"
regardless of user password "Virgin or
Learnt" |
- |
Input correct PIN code by
scanner. |
- |
Neutralizing meaning
.
: PIN code (6) & user
password (4) deletion.
: Locking of ECM (except key
teaching
permission) | |
- |
PIN Code(6) & User P/Word(4)
deletion |
- |
Locking of EMS(except Key
Learning
permission) | | |









1. |
Key Teaching Procedure
Key teaching must be done after replacing a
defective ECM or when providing additional keys to the vehicle
owner.
The procedure starts with an ECM request for
vehicle specific data (PIN code: 6digits) from the tester. The
"virgin" ECM stores the vehicle specific data and the key teaching
can be started. The "learnt" 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 ECM three times, the 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 ECM stores the relevant
data in the EEPROM and in the transponder. Then the 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 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 ECM. This rejects the key and a message is sent to
the tester.
The 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 ECM detects
different authenticators of a transponder and an 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 ECM status remains unchanged and a specific fault
code is stored.
If the 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 ECM.
When teaching the 1st key, Immobilizer
regists at the same time. |

(2) |
ECM virgin status.
After replacing new "ECM" scan tool
displays that ECM is virgin status in Key Teaching
mode.
"VIRGIN" status means that ECM has not
matched any PIN code
before. | |
Password
Teaching/changing
1. |
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" ECM. Before first teaching of user password to an ECM,
the status of the password is "virgin" No limp home function is
possible.
The teaching is started by 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 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 wrong user passwords or wrong vehicle
specific data have been sent to the ECM three times continuously or
intermittently, the ECM will reject the request to change the
password for one hour. This time cannot be reduced by disconnecting
the battery or any other actions. After reconnecting the battery,
the timer starts again for one
hour. |
2. |
User password teaching




※ In case of putting wrong password, retry
from first step after 10 seconds. |
3. |
User password changing





|
1. |
Limp Home By Tester
If the ECM detects the fault of the
Immobilizer or transponder, the 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 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 ECM via
the special tester menu.
Only if the ECM is in status "learnt" and
the user password status is "learnt" and the user password is
correct, the ECM will be unlocked for a period of time (30 sec.).
The engine can only be started during this time. After the time has
elapsed, engine start is not possible.
If the wrong user password is sent, the ECM
will reject the request of limp home for one hour. Disconnecting the
battery or any other action cannot reduce this time. After
connecting the battery to the ECM, the timer starts again for 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 ECM by a special
sequence of ignition on/off.
Only if the ECM is in status "learnt" and
the user password status is "learnt" and the user password is
correct, the ECM will be unlocked for a period of time (30 sec.).
The engine can be started during this time.
After the time has elapsed, engine start is not possible. After a
new password has been input, the timer (30 sec.) will start
again.
After ignition off, the ECM is locked if the
timer has elapsed 8 seconds. For the next start, the input of the
user password is requested again. |
