Limp Home Function
LIMP HOME FUNCTION (FOR 2.0 ENG)1. LOCKING OF ECM
If engine shut off (ignition off by key) the EMS is locked from now on.
If the timer is more than 30 sec without Cranking in Ignition status "ON" by Valid Key, ECM have to do new authentication if user attempts engine start.
In case of engine stalling about start of limp home the timing of ECM locking is as follows.
start, after ignition off the time for repeated engine start is limited to 8 sec. After elapsing this time new authentication is done or in case of limp home the input of user password is requested again.
2. LIMP HOME PROCEDURE
1. By scanner
If the ECM detects a fault of SMARTRA or transponder, the ECM will allow limp home function of 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 ECM informs the driver about the limp home condition by blinking the immobilizer indicator. Then the user password can be sent to the ECM via the limp home mode 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 other actions cannot reduce this time. After connecting of battery to ECM, the timer starts again for one hour.
2. By ignition key
The limp home can be activated also by the ignition key. The ECM informs the driver by blinking the immobilizer indicator for the limp home condition. Then the user password can be input to ECM that can be done by special sequence of ignition on/off as picture above. 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.) start again. After ignition off the ECM is locked (If timer 8 sec. is elapsed). For next start the input of user password is requested again.
3. Things to remember before a repair(1) - Installing the ECM
4. Things to remember before a repair(2) - Replace keys & Additional registration
5. Things to remember before a repair(3)
1. When there is only one master key registered and you wish to register another master key, You need to re-register the master key which was already registered.
2. When the master key #1 is registered and master key #2 is not registered, Put the master key #1 in the IG/ON or the start position and remove it. The engine can be started with the unregistered master key #2.
(Note that master key #2 must be used within 10 seconds of removing master key #1)
3. When the master key #1 is registered and master key #2 is not registered, Put the Unregistered master key #2 in the WON or the start position. The engine cannot be started even with the registered master key #1.
CAUTION: When you inspect the immobilizer system, refer to the above paragraphs 1,2 and 3. Always remember the 10 seconds zone.
6. Things to remember before a repair(4)
1. If the pin code & password are entered incorrectly on three consecutive inputs, the system will be locked for one hour.
2. Be cautious not to overlap the transponder areas.
- Problems can occur at key registration or vehicle starting if the transponders should overlap.
- This can be caused by the smartra & TP conducting radio communication.